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MikeS
Pooh-Bah


Reged: 04/06/04
Posts: 1089
Loc: Quakertown Pennsylvania
GOTO for SkyView Pro
      #176499 - 08/20/04 04:17 PM

Am I correct in saying that the Celestron CG-5, EQ-4 and Skyview Pro mounts are practically identical?

I have read somewhere that the LXD55 RA and DEC motors can be attached directly to these mounts giving them GOTO ability.

Is this correct?
Has anyone done this?
And if it were that easy, why in the world doesn't Orion come out with a SVP with goto?

Thanks
Mike S

--------------------
Mike Snisky
8" F5 Newtonian/Moonlite CR2
Orion Sirius EQ-G Mount
Astro-Tech AT6RC Ritchey-Chrétien astrograph
Orion 100mm F6
Orion 100mm ED on LXD55 Mount
Denkmeier Standards


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Greg K.Administrator



Reged: 12/11/03
Posts: 17634
Loc: Clifton Park, NY
Re: GOTO for SkyView Pro new [Re: MikeS]
      #176543 - 08/20/04 05:06 PM

If it were just a bolt-on modification to put the LXD55 motors onto the SVP head I'd probably do it, I like my SVP mount more than the LXD55. But the mount castings are different and I think it would take some modifying of the mount or the motor housings or both.

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

astrophoto gallery


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Rushwind
Carpal Tunnel


Reged: 03/11/04
Posts: 2137
Loc: Newark, CA
Re: GOTO for SkyView Pro new [Re: Greg K.]
      #176575 - 08/20/04 05:54 PM

There are at least 2 or 3 CNers who have done this very modification. I saw WarpdHavoc's Vixen GP with the LXD55 motors on it. I think that BCB also did this mod.

Perhaps one or both of them will post with their results.

BTW, Celestron *has* released a CG-5 with GOTO; their AS-GT mount sells for $700. I don't know that Orion has *any* GOTO mounts in their stable (just the "push-to" DSCs with their Intelliscope Dob line).

Jimbo

--------------------
Order of the Unblinking Eye

NJP 300D SSAG 8"f/5 (Rig)
Guidescope? What guidescope?

I used to shoot Nikon DSLR.
Before that, I shot film.


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BCB
Undercover Saboteur


Reged: 11/24/03
Posts: 6857
Loc: Look over your shoulder
Re: GOTO for SkyView Pro new [Re: Rushwind]
      #176594 - 08/20/04 06:35 PM

Yep, I've done the GOTO conversion with DS motors n a 497 Autostar.

The accuracy has been hit or miss (mostly miss) till I updated to the latest firmware. I tried using the LXD-55 setting, editing the ratios properly for the SVP mount, with results that were just plain horrid, even with a 3 star alignment. I then Used Dick Seymours patch on it, which removes the ds70, and adds the 4504 GEM model in the telescope selection. Then I reupped the patched firmware..I then redid the ratios, did a motor recal and retrain and recal again.

I've only managed to have the mount n scope out ONCE since I've made those last few firmware changes a few weeks ago. On the night the whole east coast got fantastic weather.

I dunno just what did it TBH.. Could be ANYTHING. From going the high power route (150x +) when I polar aligned it, to staying with that high a power when I did the 3 star alignment. It could be changing the scope setting to 4504 instead of lxd-55 (even though I have to set the ratios in either).. Heck, I dunno just what I did, but whatever it was worked..

Actually, worked isn't the word I'd use.. More like "perfection", in comparison to how it's been since I've done the conversion..

That one clear night I easily pulled off 20+ objects, that all either landed in a 26mm EP FOV, or came VERY close. (within 3-4 deg) Zenith objects were the ones that gave me some trouble, but objects on either side of the meridian came up great..

I will say this much:

If ANYONE plans on doing a conversion like this, it CAN be done.. But.. BE PREPARED to do some HEAVY troubleshooting. You WILL have to debug it, without a doubt.

My conversion was rather costly also.. You can do it on the cheap, but it'll look REAL nasty.. I went n spent the money.. 185 with the shipping for the motor mounts, gears n belts.. The motors n 497 controller, I horsetraded a with very good friend here. Expect to fork out about 120 for 2 motors n 497 handpaddle.. See how yer at 300 now JUST for parts ?? Now add the cost of the mount in, and REALLY think about this.. It adds up to MORE than the cost of a new LXD-75 with the reg 6" newt tube/no GOTO.. Just add the 497 and you got a full GOTO mount that by all accounts SHOULD be better than the 55 version, if Meads accuracy claims are correct..

Hope this helped, and gives you all some things to consider.. This whole thing, for me wasn't the hardest thing to do.. For some, it'll be a long suffering road, for others, a cakewalk.. Decide just how much troubleshooting/building your comfortable with and make your mind..

--------------------
Mark

Lost in thought. Please send search party!!!

Astro-Tech 111EDT
Orion 8" F5 Newt w/Moonlight CR-2 focuser
CGEM EQ mount
Treeline Observatory



Edited by BCB (08/20/04 06:37 PM)


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ccs_hello
Postmaster


Reged: 07/03/04
Posts: 5224
Re: GOTO for SkyView Pro new [Re: BCB]
      #176808 - 08/21/04 01:22 AM Attachment (184 downloads)

First, the SVP must be tuned such that the load on the gear-train (esp. Delrin type) is reduced. LXD55/75 motor's gears are all metal.

There are few options:
1. Get a LXD55 (2nd hand) or a LXD75 mount so it comes factory standard (then use the SVP mount w/o Goto.)
2. Get the LXD55 motor (2nd hand): the mounting bolt has to be trimmed shorter to fit. There is also a minor glitch: spur gear (used on '55) on the Worm shaft is a little bit too large to fit the RA housing, so tweaking/grinding may be needed.
3. Use the DS-motors and the "Goto4all" kit. Check the total budget sheet first! Do a google on that word, it'll show you vast amount of info, usually converge in a place starting with the letter "R" (R.S.)
4. Try my poorman's approach: this is DH motor based. I'll show the RA and DEC photos. This is a bigger subject/project though. (Hint: DH output shaft needs a needle bearing.)

ccs_hello

Attachment


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ccs_hello
Postmaster


Reged: 07/03/04
Posts: 5224
Re: GOTO for SkyView Pro new [Re: ccs_hello]
      #176810 - 08/21/04 01:24 AM Attachment (187 downloads)

DEC picture.
ccs_hello

Attachment


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BCB
Undercover Saboteur


Reged: 11/24/03
Posts: 6857
Loc: Look over your shoulder
Re: GOTO for SkyView Pro new [Re: BCB]
      #176995 - 08/21/04 10:29 AM

I didn't have a chance to take a pic of my conversion, and the pics I DID have I deleted a few days ago...

Here's what a Goto4All conversion looks like on the SVP mount.

edit - picture is in a later post by BCB - John

--------------------
Mark

Lost in thought. Please send search party!!!

Astro-Tech 111EDT
Orion 8" F5 Newt w/Moonlight CR-2 focuser
CGEM EQ mount
Treeline Observatory



Edited by jrcrilly (10/19/04 06:17 PM)


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Don W
demi-god


Reged: 05/19/03
Posts: 19226
Loc: Wisconsin, USA
Re: GOTO for SkyView Pro new [Re: BCB]
      #177054 - 08/21/04 12:36 PM

Dang that's a huge image. Can you bring it down to one screen size please?

I have the same setup on a Vixen Great Polaris and it works great.

--------------------
DON'T PANIC!-Hitchhiker's Guide to the Galaxy

Don Wyman
Obsession 18" f/4.5 #1166
W/Argo Navis DSC and Torus Primary


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Charlie HeinAdministrator
Postmaster


Reged: 11/02/03
Posts: 11211
Loc: 26.06.08N, +80.23.08W
Re: GOTO for SkyView Pro new [Re: MikeS]
      #177772 - 08/22/04 04:02 PM

Quote:

Am I correct in saying that the Celestron CG-5, EQ-4 and Skyview Pro mounts are practically identical?




Practically, but not actually. There are some considerations to take into account because of slight differences in design between different mounts. For example, be careful with the bolt used to attach the RA motor. It may turn out to be too long for your mount and if you tighten the motor assembly down you can puncture the small DC motor with the bolt, wrecking your motor altogether.

Quote:

I have read somewhere that the LXD55 RA and DEC motors can be attached directly to these mounts giving them GOTO ability.




Not quite, if you're talking about the SVP - the motor itself will bolt on ok with some modest modifications, but there's a clearance issue with the RA spur gear...



As you can see, the spur gear will not fit correctly because the design of the SVP has some extra metal in the way. Directly underneath that metal is the RA worm wheel, so if you want to remove the offending metal to get the stock spur gear on (which would then allow you to use the stock LXD55 settings on the Autostar), you'll need to completely disassemble the mount to avoid getting all manner of metal shavings stuck on the RA wormwheel.

If your SVP has never been torn apart and regreased, this might not be a bad idea in fact. Getting rid of all that black glue that they call grease is highly recommended anyway. Also, bear in mind that the plastic motor housing is not an exact fit either, so if you're going to cut off enough metal for the spur gear to fit, you might as well grind off some of the side surface too so that the motor housing fits nicely.

If you don't feel like tearing your SVP apart and grinding on it, another alternative would be to find another pair of spur gears, one that's small enough to fit in the space provided on the SVP, and another large enough to mate up to this gear from where the motor sits. You'll then have to calculate the ratio and enter it into the Autostar so that your goto will work.

Charlie

--------------------
Weston CSC:


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ccs_hello
Postmaster


Reged: 07/03/04
Posts: 5224
Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #224229 - 10/17/04 11:20 PM Attachment (202 downloads)

Just a new shot (SVP w/ GOTO) from a better camera.

ccs_hello

Attachment


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litespeed
scholastic sledgehammer


Reged: 10/31/03
Posts: 984
Loc: Space Coast, FL
Re: GOTO for SkyView Pro new [Re: ccs_hello]
      #224237 - 10/17/04 11:30 PM

Hello,

Wow,,,,, That shot is wayyyy better!

How is that working out for you? I've been talking around and I am looking for constructive criticisim before I consider taking the plunge and giving it a go.

Are you using the 497 controller? Are your objects always in the field of view? If not how far off? Why did you opt. for the gears instead of the pulleys and belts?

Just a few of about a thousand questions I have.

Any info. is greatly appreciated.

Thanks,

AJ


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ccs_hello
Postmaster


Reged: 07/03/04
Posts: 5224
Re: GOTO for SkyView Pro new [Re: litespeed]
      #224271 - 10/18/04 12:05 AM

AJ,

I got my new Canon A75 camera (15" exposure max., Manual capable, 1/1.8" Sony CCD and far better camera algorithm) which is far better than my earlier QC Pro 4000 (Sharp CCD type).

The GOTO accuracy is OK for visual (19mm Konig Russell 67 FOV), haven't tried Astrophoto (A75 is a compromise since the dream Digital Rebel's price hasn't dropped enough yet)

I am using a 497 controller but no PEC since my mount is not permanently fixed.

At one point I was thinking of using the MXL timing belt and pulley system (sdp-si.com) but opted for the easier and cheaper spur gear system. Although more potential backlash and no (Stepper motor jitter) damping effect, but for the DH-motor (or DS-motor) DC-motor servo based seems to be OK and I spent only tiny little bit $ on the GOTO upgrade.


ccs_hello

Footnote: I later joined the "242 club" like many . IMHO, the LXD motor is easier to work with and very easy to adapt. But I've already several months into my SVP-8N and DH motor mod. project and didn't know the LXD75-6N bargain pricing then.


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litespeed
scholastic sledgehammer


Reged: 10/31/03
Posts: 984
Loc: Space Coast, FL
Re: GOTO for SkyView Pro new [Re: ccs_hello]
      #225051 - 10/18/04 10:35 PM

Hello,

Nice camera......... I have had the A80 for a little over a year.... Incredible camera for the money!! I have had several Sonys and Nikons (0f the same caliber). The Canon kills em.

The battery life will blow your mind too with the right batteries. I use Rayovac I-C3 2000NIMH's. I use my camera every day with my business. I can literally go 2 weeks without a re-charge. That is using the camera every day!! After a year I still cannot believe it. Tough camera too. I never got the mount and adapter for my scope.... but I have had fun piggybacking it. I'll probaly get the setup this year. The only bummer is there is no bulb setting....

Keep me posted when you take pic's..... I'm VERY interested. Especially in conjunction with your new mount mods.

Try those batteries....... You wont be dissapointed!

AJ

--------------------
AJ


5"MAK
TouCam
20D

Uh Oh!... Whats that noise?...


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ccs_hello
Postmaster


Reged: 07/03/04
Posts: 5224
Re: GOTO for SkyView Pro new [Re: litespeed]
      #225097 - 10/18/04 11:23 PM

AJ,

I am on the cheap side. Got a big box (60 pcs) of 2200mAH NiMH batteries. End up paying approx .80/ea.

You know Canon camera has the Remote Control API. Bundled Canon software "Remote Shooting" feature allows time interval shooting and directly send pics (no RAW ) to PC. So multiple 15" ISO 200/400, manual focus-infinity probably will compete well with uncooled CCD

BTW, Cam4You software can make this camera functions like webcam outputing AVI file. Nice!

But I know I want Canon 300D. Canon 300D, Canon 300D....


My longer term goal is to do autoguiding. E.g., Guidedog sends back LX200 serial commands to the 497 controller. I figure extracting the last juice from the mount takes more effort than just let PC do the work.

ccs_hello


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Charlie HeinAdministrator
Postmaster


Reged: 11/02/03
Posts: 11211
Loc: 26.06.08N, +80.23.08W
Re: GOTO for SkyView Pro new [Re: BCB]
      #225733 - 10/19/04 05:11 PM

Quote:

Here's what a Goto4All conversion looks like on the SVP mount.




What did you do with the control panel for the autostar?

Charlie

--------------------
Weston CSC:


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BCB
Undercover Saboteur


Reged: 11/24/03
Posts: 6857
Loc: Look over your shoulder
Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #225787 - 10/19/04 06:12 PM Attachment (137 downloads)

LOL

Sorry peeps

Can a mod just delete my post with the large pic, or will that end up trashing the thread?? I can't edit the darn thing now.. LOL

By control panel, are you referring to the small panel that the motors n handpaddle plug into ? If that's what ya meant, take another look it's on the RA housing. Attached with one 8-32 cap head screw and washer. If you mean the handpaddle itself, I haven't done ANYTHING with it.. The darn velcro refuses to stay on wherever I put it.. The piece on the back of the paddles on real good though, but the other piece don't stick to save my life.. I usually just sit it on the tray most of the time..

I redid the pic to make it smaller..

Thanks JC The thread needed to be rid O that..

Attachment

Edited by BCB (10/19/04 06:19 PM)


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Greg K.Administrator



Reged: 12/11/03
Posts: 17634
Loc: Clifton Park, NY
Re: GOTO for SkyView Pro new [Re: BCB]
      #226072 - 10/19/04 11:37 PM

Thanks for reviving this thread - I'm interested in putting the motors from my LXD55 on my SVP mount, since it's got a much better RA section, with ball bearings etc.

Now, if only someone could come up with a way to make the LXD55 polar scope fit the SVP head..

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

astrophoto gallery


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ccs_hello
Postmaster


Reged: 07/03/04
Posts: 5224
Re: GOTO for SkyView Pro new [Re: Greg K.]
      #226151 - 10/20/04 12:26 AM

Greg,

Please note the LXD motor mounting screw is 1/4" too long in the SVP application.

In general,
if working on SVP or CG5 mount, I suggest checking this thread out:
http://www.cloudynights.com/ubbthreads/showflat.php?Cat=&Board=lxd55&Number=176135&Forum=,f41

The worm shaft and its housing has too much play for these 2 types. The mod. was described there.

ccs_hello


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Greg K.Administrator



Reged: 12/11/03
Posts: 17634
Loc: Clifton Park, NY
Re: GOTO for SkyView Pro new [Re: ccs_hello]
      #226159 - 10/20/04 12:33 AM

Thanks - It's a shame all the hoops we have to go through to get these cheap mounts just to work well.

You don't happen to know of any links showing LXD55 motors adapted to the SVP do you?

I just checked and it seems that the LXD55 RA motor housing won't fit on without some significant modification. No such problem for DEC, I just added two washers between the motor and the DEC housing and it's spaced perfectly.

Sure wish I could afford a Vixen Sphynx

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

astrophoto gallery


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ccs_hello
Postmaster


Reged: 07/03/04
Posts: 5224
Re: GOTO for SkyView Pro new [Re: Greg K.]
      #226175 - 10/20/04 12:56 AM

RE: LXD motor on SVP

Please check with WarpdHavoc and this thread:
http://www.cloudynights.com/ubbthreads/showflat.php?Cat=&Board=lxd55&Number=151335


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Greg K.Administrator



Reged: 12/11/03
Posts: 17634
Loc: Clifton Park, NY
Re: GOTO for SkyView Pro new [Re: ccs_hello]
      #226520 - 10/20/04 12:15 PM

Well, a little plastic trimming and I think the RA motor will fit after all, now I just have to get a shorter motor mounting screw and grind a little off the side of the RA housing for the spur gear and I'm set.

I'll post a pic when I'm done.

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

astrophoto gallery


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Greg K.Administrator



Reged: 12/11/03
Posts: 17634
Loc: Clifton Park, NY
Re: GOTO for SkyView Pro new [Re: Greg K.]
      #226533 - 10/20/04 12:29 PM

One hitch is that the motor housings bump into the setting circle thumbscrews on both axis, so I've got to take them out.

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

astrophoto gallery


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Charlie HeinAdministrator
Postmaster


Reged: 11/02/03
Posts: 11211
Loc: 26.06.08N, +80.23.08W
Re: GOTO for SkyView Pro new [Re: Greg K.]
      #226548 - 10/20/04 12:52 PM

Quote:

...grind a little off the side of the RA housing for the spur gear and I'm set.




You might consider taking the mount apart before grinding on the housing right there... the RA worm wheel is exposed right under that opening, and if you grind on the housing I can't see how you could avoid getting metal shavings all over the wormwheel, stuck in the grease.

Charlie

--------------------
Weston CSC:


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BCB
Undercover Saboteur


Reged: 11/24/03
Posts: 6857
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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #226823 - 10/20/04 04:45 PM

Quote:

Well, a little plastic trimming and I think the RA motor will fit after all, now I just have to get a shorter motor mounting screw and grind a little off the side of the RA housing for the spur gear and I'm set.

I'll post a pic when I'm done.




If your willing to wait a bit, and have it look nice without grinding on the housing, (which WILL look nasty IMHO) Why not try and get the belt and gears, (used in the goto4all conversion) and just use those instead ? The final ratio will still be 1:1.

It'll add a bit to the cost, but will work nice without having to worry over gear backlash which can be a hassle to set up properly.

One other thing also. Has to do with the goto4all conversion like mine. Objects at or near the meridian when the scopes on the east side of the mount can be a problem due to DEC motor placement.
You WILL crash the DEC into the RA at least once and burn a gear.. Have a spare DS motor or 2 in case you do it like I did..
There's a spacer that fits in between where the DEC head is attached to the RA head. Adds about an inch, but supposedly helps with the motor clearance.. I need to make one myself, just never got round to it..

--------------------
Mark

Lost in thought. Please send search party!!!

Astro-Tech 111EDT
Orion 8" F5 Newt w/Moonlight CR-2 focuser
CGEM EQ mount
Treeline Observatory



Edited by BCB (10/20/04 05:07 PM)


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Greg K.Administrator



Reged: 12/11/03
Posts: 17634
Loc: Clifton Park, NY
Re: GOTO for SkyView Pro new [Re: BCB]
      #227020 - 10/20/04 08:05 PM

Hmm. Belt & pulley does seem like a possible alternative to grinding. What's a good source, McMaster-Carr?

the LXD55 housings mount in the same place on the SVP as the do on the LXD55, so the clearances should be the the same.

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

astrophoto gallery


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BCB
Undercover Saboteur


Reged: 11/24/03
Posts: 6857
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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #227044 - 10/20/04 08:37 PM

Greg, give me a day or 2 on the part #'s for the gears and belts. Got more cruddy weather here, and I have the scope/mount covered.. The belt lengths will need to be determined, but that's no biggie. Also, the mounts ratio "direction" in the autostar controller( + or - ) will need to be changed once you set up with a belt/gear arrangement. Another no biggie, but a definate "need to know" thing.

I did research the gears and belts a few months back. I was considering doing a goto4all type thing using different materials and design, but found it to be too cost prohibitive in the initial batch size I wanted to make.

I have to look at 2 things in order to be able to send you to the right place for them.
You'll be using metric stuff, since that's what the SVP mounts manufactured to for the most part.

--------------------
Mark

Lost in thought. Please send search party!!!

Astro-Tech 111EDT
Orion 8" F5 Newt w/Moonlight CR-2 focuser
CGEM EQ mount
Treeline Observatory



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ccs_hello
Postmaster


Reged: 07/03/04
Posts: 5224
Re: GOTO for SkyView Pro new [Re: BCB]
      #227079 - 10/20/04 09:19 PM

Greg,

Need to know what's your choice on the motor side. Worm shaft side bore is 6mm for LXD/SVP (7mm for EQ6). While in DH mod., my mod. motor shaft is 1/4" while DS mod. people either choose 1/4" or 6mm depends on the shaft mod. Also, LXD motor shaft is 5mm. These will affect the selection. I find sdp-si.com has quite a good collection.
E.g., (MXL sized belt) 6mm shaft side pulley:
A6T16M018DF6006
https://sdp-si.com/ss/PDF/26503007.pdf

ccs_hello


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Greg K.Administrator



Reged: 12/11/03
Posts: 17634
Loc: Clifton Park, NY
Re: GOTO for SkyView Pro new [Re: ccs_hello]
      #227247 - 10/21/04 12:50 AM

Thanks guys.

The LXD55 motors are what I've got, so that's what I'm using. I'm just going to do the motor transplant from one to the other.

The one show stopper that may rule out pulleys is that I want anything I use to fit inside the LXD55 motor housing, and there's not much room for anything wider than the spur gears already there (~10mm or so total on the shaft). The pulleys at the link from ccs_hello are 17mm wide.

What about just using new spur gears of different sizes, bigger on the motor and smaller on the worm gear? I know I'd have to compute the ratio and set it in the autostar controller.

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

astrophoto gallery


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darylf96
Pooh-Bah


Reged: 08/28/04
Posts: 1432
Loc: Danville, California
Re: GOTO for SkyView Pro new [Re: ccs_hello]
      #227300 - 10/21/04 02:18 AM

Here is a UK company that has high-end go-to kits
for all the Vixen and Vixen clone mounts

http://dspace.dial.pipex.com/awr.tech/ih/index.htm

--------------------
Intes Micro MN66 - Meade 10" SCT
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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #227373 - 10/21/04 08:05 AM

Quote:

What about just using new spur gears of different sizes, bigger on the motor and smaller on the worm gear? I know I'd have to compute the ratio and set it in the autostar controller.




That's probably the cleanest way to do it, unless you fabricate a new housing for the motor that opens up the drive side - in which case you could put whatever you like there. Where you source the gears from is another question altogether.

If you haven't already taken the SVP apart to re-lube it, you might consider doing it now, and grinding out the clearance for the stock spur gear wouldn't be that big a deal (aside from cleaning up the paint). You'd kill two birds with one disassembly, and you already have all the parts you'd need.

Charlie

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Re: GOTO for SkyView Pro new [Re: ccs_hello]
      #227380 - 10/21/04 08:19 AM

Quote:

Worm shaft side bore is 6mm for LXD/SVP (7mm for EQ6).......LXD motor shaft is 5mm.




Speaking of the EQ6/Atlas... that belt drive mod using the LXD55 motors looks better and better all the time... it sure looks like it would cure almost all of the backlash in that mount, and give you autostar to boot. I'll bet the LXD55 servos are a touch stronger than the stock EQ6 steppers, too. How much do you think that a set of belts and pulleys would cost in that configuration?

Charlie

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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #227558 - 10/21/04 10:56 AM Attachment (91 downloads)

Answer the spur gear based solution first: if the mount housing is not going to be trimmed: use the 32T-48T gears.

Worm shaft side: metric0.8Pitch 32T
LXD motor side: metric0.8Pitch 48T

My mod. the motor was DH, so the pic is a little bit different but one can get the general idea.

ccs_hello


Attachment


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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #227596 - 10/21/04 11:32 AM

Quote:

Thanks guys.
The one show stopper that may rule out pulleys is that I want anything I use to fit inside the LXD55 motor housing, and there's not much room for anything wider than the spur gears already there (~10mm or so total on the shaft). The pulleys at the link from ccs_hello are 17mm wide.





Worthwhile to clarify the what need to be trimmed if using LXD motor on SVP/CG5 mount:

1) motor mounting screw passing thru the mount unit itself (too long)
2) if using spur gear larger than 32T (see earlier posting picture), the RA mount housing (the Aluminum part) may need to be trimmed a little bit
3) the RA PLASTIC housing may not fit too well with whatever the adaptation is, for this item, I would say:

There is a solution: Dremmel tools against the housing.
Don't like that, then
call commercial vendors to see if THEY ?can? meet your requirements and how much they charge ;-)

ccs_hello

Edited by ccs_hello (10/21/04 12:36 PM)


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Re: GOTO for SkyView Pro new [Re: ccs_hello]
      #227650 - 10/21/04 12:42 PM

Quote:

There is a solution: Dremmel tools against the housing.




I'd like to follow the Monster Garage credo: "when complete, the machine must appear to be stock". No visible gaping holes.

I think I'm going to bite the bullet and grind the mount. I never noticed, but it actually already does have a small indentation there for clearance for the "truetrack" drive gear. I just need to make it a bit bigger, and it'll be covered by the motor housing anyway.

I think it'll look nice.

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Edited by Greg K. (10/21/04 12:45 PM)


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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #227666 - 10/21/04 01:03 PM

Quote:

Quote:

Worm shaft side bore is 6mm for LXD/SVP (7mm for EQ6).......LXD motor shaft is 5mm.




Speaking of the EQ6/Atlas... that belt drive mod using the LXD55 motors ..... a set of belts and pulleys would cost in that configuration?

Charlie




Charlie,

I would suggest sdp-si.com's pulleys (5mm for LXD side A6T16M018DF6005 and 6mm bore one A6T16M018DF6006 enlarged to 7mm for the EQ6 worm shaft side). Check all dimensions before making decision.

and

Timing belt, e.g., 40 grooves (https://sdp-si.com/ss/PDF/26501007.PDF)
choose Kevlar cord, metric 6mm wide A6B16M 040 060.
Replace the 040 number with whatever grooves you need to fit.

ccs_hello


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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #227673 - 10/21/04 01:20 PM

Quote:

I think I'm going to bite the bullet and grind the mount.




Not to harp on the subject, but you are planning on taking the mount apart first, right? There's no way you'll avoid getting metal shavings in the worm wheel grease unless you do...

Charlie

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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #227679 - 10/21/04 01:28 PM

Quote:

Not to harp on the subject, but you are planning on taking the mount apart first, right?




Yes, I will - I want to inspect/relube the RA axis anyway, it's a little stiffer than I'd like. I did the DEC axis a while ago.

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Re: GOTO for SkyView Pro new [Re: ccs_hello]
      #228456 - 10/22/04 09:27 AM

Quote:

Timing belt, e.g., 40 grooves (https://sdp-si.com/ss/PDF/26501007.PDF)
choose Kevlar cord, metric 6mm wide A6B16M 040 060.
Replace the 040 number with whatever grooves you need to fit.




That raises a question... if the motors mount to the inside of the side plate of the EQ6, do you think it prudent to allow for tension adjustment, or can you just stretch the belt onto the hubs?

Charlie

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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #228645 - 10/22/04 12:24 PM

Charlie,

The belt is pretty rigid. Since there is no tensioner, probably should try premount the belt then install both pulleys on the shafts at the very last step. Another idea is to change the motor mounting hole such that motor can be moved further apart after the belt is installed.

ccs_hello

P.S.
I should take this opportunity to recognize RoboScope and EQ6 groups' efforts on mount GOTO mods.


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Re: GOTO for SkyView Pro new [Re: ccs_hello]
      #228649 - 10/22/04 12:29 PM

Quote:

Another idea is to change the motor mounting hole such that motor can be moved further apart after the belt is installed.




I was giving some thought to that very thing - possibly a mounting plate that the LXD55 motor mounts to, which then attaches to the cover plate using slotted holes to allow you to tighten the belt...

Quote:

P.S.
I should take this opportunity to recognize RoboScope and EQ6 groups' efforts on mount GOTO mods.




I wholeheartedly agree with you on that! I don't think I've seen an EQ6 mod like the one we're talking about there, though. The closest thing I've seen is the commercial product from Astromeccanica.

Charlie

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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #228881 - 10/22/04 04:58 PM

What are you waiting for then Charles ?? If I had that Atlas, I'd be working like crazy to get it fully goto..

The belt and pulley setup is VERY nice in comparison to gears. much quieter for the most part. If the belt squeeks, it's either too tight, or needs a small shot of silicone spray to silence it.

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Re: GOTO for SkyView Pro new [Re: BCB]
      #229314 - 10/23/04 03:40 AM

Success!!





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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #229319 - 10/23/04 04:18 AM

Here's what I did

- The Dec axis motor mounted without much trouble, I just needed to use 2 washers as a spacer between the motor and the mount head so that the gears would mesh.

- I took the RA axis apart to grind the side of the housing with a Dremel tool to make room for the spur gear on the worm shaft. This doesn't look too bad, and in any case is completely covered by the motor housing.

- Trimmed the plastic on the RA motor housing so that it would fit. The trimming was mostly on the underside and isn't noticible.

- I took advantage of having the RA axis apart to clean, file down rough spots and regrease - it's noticibly smoother.

- I replaced the O-rings on the worm gear shaft with cut down nylon spacers.

- I purchased one other new part - a 1/4" 1-1/2" screw to mount the RA motor.

The motors are handling this mount with ease, the Skyview Pro's RA shaft is much more capable than the LXD55's ever dreamed of being, and it is far better able to handle the load of my OTA.

--------------------
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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #229391 - 10/23/04 09:51 AM

All I can say is "WOW"! Great looking job, Greg! When I saw your setup, I had to do a double take - your OTA is almost identical to mine, with the major exception being the CR1 focuser (I have the CR2).

Good move using the LXD55 counterweight shaft on the SVP, the extra couple of inches it gives you in length will come in really handy when you start loading that OTA up with stuff. I checked, and the original SVP end cap is interchangable with the LXD55 one as well, so if you swap those out, you'll keep a nice "stock" look to the SVP.

By the way, I had my OTA out on the LXD55 last weekend and you're 100% right - the SVP completely blows it away in terms of stability. I really think that your modded SVP is going to perform even better than the LXD75 in that regard, but that's just my opinion.

Now on to the big questions:

Have you star tested yet? I'm very curious to know if you have any issues with the DEC motor colliding with the mount. Using the DS motors and the GoTo4All brackets on a SVP, I've noticed that the DEC motor can collide with both the mount itself (the DEC bracket hits the RA lock) and also with the RA motor (in certain cases where you're looking "behind" the mount to the south). The LXD55 setup looks like it may avoid this, but I'm looking for someone who has "been there and done that" and can say for certain what the chances are for the mount to collide with itself.

Secondly, how are the GoTo's? Good pointing accuracy? Good slewing speed?

Last question: I'm figuring that you replaced the rubber O-Ring for stability reasons... did you notice any play in the worm gear before replacing it, and if so, how dramatic is the change?

Once again, great job! It just looks amazing, just like it was really made for it as opposed to being a mod, which is the classic mark of a really good one!

Charlie

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Re: GOTO for SkyView Pro new [Re: BCB]
      #229396 - 10/23/04 10:07 AM

Quote:

What are you waiting for then Charles ?? If I had that Atlas, I'd be working like crazy to get it fully goto..




A friend of mine was going to do the fabrication of the new cover and motor plates for me since I don't have any of the proper tools to do a job like this (my original thought was to do the mod like this), but he had a lot of personal things hit him all at once and I've been a little reluctant to bring up the subject - bottom line is that the parts still aren't done as far as I can tell. I need to at least retreive the motor he has so that I can continue this thing some other way. Also, I've been up to my eyeballs with a busy work schedule that has had me out of town a lot over the summer. To top it all off, this summer has been the pits down here as far as observing goes. We are just now getting to the point where you can set up for the night and have a reasonable chance that you won't get rained on.

On the up side, I now have a "backup" mount to use while working on one or the other, so I don't need to worry so much about having the mount out of commission when the weather decides to cooperate!

Finally, it's like every time I think I have what I want to do with it all figured out, I see something that gives me another idea! I do however think that the belt drive idea might be the way to go.

Charlie

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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #229447 - 10/23/04 12:14 PM

Quote:

Good move using the LXD55 counterweight shaft on the SVP,




Actually that's the shorter SVP shaft, it just has the LXD55 collar. I just used it because I already taped the shaft where the counterweights need to go and I last used it on the LXD55 - I've already switched the collars back. It's easy enough to swap shafts if I need the longer one though.

Quote:

Have you star tested yet?




Nope Maybe tonight. However I am very confident that it'll perform better than the LXD55. I did test it with the motors in every conceivable position and no collisions. It's at least as good if not better than the LXD55 in that regard. The only major difference that I was worried about is that the DEC locking knob is on the "east" side of the DEC housing on the SVP and on the "north" side under the motor housing on the LXD55, but no problems.

Quote:

Last question: I'm figuring that you replaced the rubber O-Ring for stability reasons... did you notice any play in the worm gear before replacing it, and if so, how dramatic is the change?




Last year when I was doing planetary imaging with it, there seemed to be a bit of periodic error as compared to the LXD55. I don't know if it's the o-rings or the difference in motors, but this was a simple mod considering I already had it all apart.

Quote:

Once again, great job!




Thanks! I'm really happy with the way it turned out. I'm curious to see how your Atlas works out.

--------------------
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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #229504 - 10/23/04 01:20 PM

Quote:

Thanks! I'm really happy with the way it turned out. I'm curious to see how your Atlas works out.




I just need to quit procrastinating and make things happen with that! Keep us in the loop on how this is working out for you.

One question... any qualms in your mind about using your LXD55 for parts?

Charlie

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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #229608 - 10/23/04 03:22 PM

Quote:

any qualms in your mind about using your LXD55 for parts




"Parts is parts", whatever works. I think what I ended up with is better than what I started with, always important with a good mod.

I can still use the LXD55 manually. I stuck the slow-mo knobs from the SVP on it.

I'd put the RA motor from the SVP on it, but the worm shaft doesn't extend out the other side as on the SVP so I couldn't also use the knob. Maybe I'll just sell that motor.

Now, if I could find a way to adapt that LXD55 polar scope to the SVP..

--------------------
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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #229624 - 10/23/04 03:41 PM

Quote:

Now, if I could find a way to adapt that LXD55 polar scope to the SVP..




I like the Orion polar scope much better anyway. All you need to do is turn the unloaded mount by hand in RA until either the Big Dipper or Cassiopeia lines up with where it really is in the sky, then put Polaris in the little circle - BAM! You've got a pretty good polar alignment. If you did manage to get the polar scope from the LXD55 to fit, it needs the circles that are with it in order to work. It's definitely a more involved process, so much so that most folks just line up polaris in the center cross and leave it at that.

Charlie

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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #229628 - 10/23/04 03:45 PM

Quote:

It's definitely a more involved process, so much so that most folks just line up polaris in the center cross and leave it at that.

Charlie




Guilty.

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Re: GOTO for SkyView Pro new [Re: jrcrilly]
      #229722 - 10/23/04 06:34 PM

HEHE

VERY nicely done.. Looks fantastic..

I did the rubber o ring mod as well.. Ditched them along with everything else in both axises cept for the worm shafts and the brass spacers the o-rings used to sit on, and used roller bearings instead.. I had to make a special bronze collar for the bearing to sit in though, since the worm shaft mount housing hole is about .020 larger than the O.D. of the bearings I used. The collars worked out great.. NO end play at all either.. Just screw the threaded collar down till it hits and lock it in with the jamb nut. made for MUCH smoother worm rotation, which translates to less motor torque when the mounts loaded up with almost 35# of OTA and counterweights.

I'm also guilty of lining up dead onto Polaris.. Only difference is, I DON'T HAVE the polar scope.. I just center my eye up to the hole, get Polaris close, then fine tune it Using high power on the OTA, and then do a 3 star alignment. The last star in the alignment fixes the cone error, and gives me absolute pointing perfection now..

I'm a VERY happy camper.. Only took 3-4 months to iron all the bugs out to this level. LOL

--------------------
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Lost in thought. Please send search party!!!

Astro-Tech 111EDT
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Edited by BCB (10/23/04 07:01 PM)


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Re: GOTO for SkyView Pro new [Re: BCB]
      #229844 - 10/23/04 09:40 PM

Quote:

I'm also guilty of lining up dead onto Polaris.. Only difference is, I DON'T HAVE the polar scope.. I just center my eye up to the hole, get Polaris close, then fine tune it Using high power on the OTA, and then do a 3 star alignment. The last star in the alignment fixes the cone error, and gives me absolute pointing perfection now..




So you don't feel like the polar scope is even necessary? I feel kinda naked without one...

Quote:

I'm a VERY happy camper.. Only took 3-4 months to iron all the bugs out to this level. LOL




So you don't mind us picking your brain on the shakedown cruise? Honestly, I wish I had the resources to do things like the roller bearing mod, but I just don't. So for me, I have to rely on others for that part of the deal.

Hopefully, I will read about someone else's problems and avoid having to figure out how to deal with it...

Charlie

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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #229862 - 10/23/04 10:13 PM

Quote:

So you don't feel like the polar scope is even necessary? I feel kinda naked without one...






Awwwww, comeon... LIVE a little.. No polar scope is no big deal when your on a 3 star.. The other ones though, I'm not sure about.

I don't even bother leveling it now either, even though it would seem you would need to... How's that for bizarre ?

Quote:

So you don't mind us picking your brain on the shakedown cruise?




Not at all.. The autostar I'm ok with now.. Took awhile to figure it out.. Weasner's site is the place to go and read up till your eyes hurt for GOTO accuracy issues/troubleshooting.
Yahoo Roboscope is the place to go for my version of mod, and has lot's of info for this mod for other mounts too. Charles already knows this..

Quote:

Honestly, I wish I had the resources to do things like the roller bearing mod, but I just don't. So for me, I have to rely on others for that part of the deal




Were it not for my job, I'd be in the same boat right next to ya.
I'm actually considering the purchase of one of those smithy 2 in one machines on the secondary market. I have too many things to make, and never enough time at work to get em all done.

--------------------
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Lost in thought. Please send search party!!!

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Re: GOTO for SkyView Pro new [Re: BCB]
      #230002 - 10/24/04 02:38 AM

First light tonight -& it works as well as I'd hoped.

It actually seems quieter than the LXD55, which is somewhat surprising since I thought most of the noise was from the motors and gears. With the LXD55 I always felt the need to set it to "quiet slew" but didn't bother tonight.

The mount moves more smoothly and just seems more solid overall.

GOTOs were pretty accurate, not perfect, although I didn't train the drives and I expect that will make a difference.

All in all I think it's a tremendous improvement over the LXD55, but I suppose the real test will come when I try imaging with it.

--------------------
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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #230047 - 10/24/04 05:16 AM

Quote:

If you did manage to get the polar scope from the LXD55 to fit, it needs the circles that are with it in order to work. It's definitely a more involved process, so much so that most folks just line up polaris in the center cross and leave it at that.




A quick way to align with the LXD55 polar scope more accurately than simply centering on Polaris is to imagine an imaginary line from Kochab to Polaris.. Then simply orient the polar scope so that the reticle line lies along this imaginary line, and then adjust mount alt and azimuth until Polaris is in the little circle. Very easy as long as you can see Kochab.

I never use the setting circles.

--------------------
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Edited by Greg K. (10/24/04 05:43 AM)


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Bill Grass
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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #230379 - 10/24/04 05:35 PM

Sweet, Greg! Is your declination setting circle on upside-down? I assume that's because Synta put the 2-degree increments on the wrong side of the circle from the arrow, right?

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Greg K.Administrator



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Re: GOTO for SkyView Pro new [Re: Bill Grass]
      #230462 - 10/24/04 07:34 PM Attachment (80 downloads)

Quote:

Is your declination setting circle on upside-down?




No, the tick marks are on the bottom - just the opposite of the RA circle, where they're on the top. However after this mod I can't really use the setting circles, at least the Declination one is halfway covered by the motor housing. But then, with GOTO, what's the point?

Attachment

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

astrophoto gallery


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Charlie HeinAdministrator
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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #230580 - 10/24/04 10:02 PM

Greg, how difficult would you rate the dissassembly of the RA axis? Any gotchas?

Charlie

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ccs_hello
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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #230616 - 10/24/04 10:47 PM

"how difficult would you rate the dissassembly of the RA axis?"
My sample points: both of my Orion SVP and Celestron (newer model) CG5 mount heads are fairly easy to deal with. There is no locktite in the thread.

Also, in the CG5 case, there is no "frozen" worm gear stuck with another part, etc. Not many uneven spots need to be polished too. For 1 LXD55 and SVP mounts, I do need to perform the polishing. Somehow I think few mounts came (pre-)tuned at early stage of their life ;-)

I do find a small block of wood with two nails pass through help a bit in turning the Aluminum collar near the bottom of the RA axis.

ccs_hello


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Greg K.Administrator



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Re: GOTO for SkyView Pro new [Re: ccs_hello]
      #230664 - 10/24/04 11:47 PM

Quote:

Greg, how difficult would you rate the dissassembly of the RA axis? Any gotchas?




Pretty straightforward, just loosen the three set screws in the ring nut at the bottom and it all comes apart. Mine was missing a set screw, and it had never been apart. Hmm.

Reassembly is simply a matter of getting the ring nut just tight enough to prevent in and out play but not so tight that the shaft is hard to turn.

I didn't have nearly as much polishing to do as I did with the LXD55 - With the LXD55 I was amazed at just how poorly finished the internal metal-on-metal parts were.

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

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Bill Grass
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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #230935 - 10/25/04 10:15 AM

Quote:

Quote:

Is your declination setting circle on upside-down?




No, the tick marks are on the bottom - just the opposite of the RA circle, where they're on the top. However after this mod I can't really use the setting circles, at least the Declination one is halfway covered by the motor housing. But then, with GOTO, what's the point?



Oh, I see. The tick marks are above the numbers on mine. Did Orion (or Synta) change this recently? Your circle's configuration makes much more sense than mine!

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Greg K.Administrator



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Re: GOTO for SkyView Pro new [Re: Bill Grass]
      #231042 - 10/25/04 11:51 AM

Quote:

Did Orion (or Synta) change this recently?




I bought mine new last November. How old is your mount?

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

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Bill Grass
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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #231255 - 10/25/04 03:56 PM

I got mine last year around September, I believe. Hmmm...

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Re: GOTO for SkyView Pro new [Re: Bill Grass]
      #236368 - 10/30/04 04:03 PM

Hey Greg - could you post a picture of where you cut the RA motor and how much you took off the RA housing to get the spur to fit?

Also, How is the mod now that you've had it outside a few times? GoTo's any better?

Charlie

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Greg K.Administrator



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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #236933 - 10/31/04 11:08 AM Attachment (116 downloads)

I've had it outside a couple times but only looked at Saturn & the moon, since the full moon has killed any DSO viewing. I don't need the GOTO to find Saturn

Attachment

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

astrophoto gallery


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Greg K.Administrator



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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #236941 - 10/31/04 11:13 AM Attachment (103 downloads)

All of my motor housing trimming was on the back and on the bottom towards the back. I took off more than I needed on the back unfortunately.

It also doesn't look nearly as rough in person as it does in this pic.

Attachment

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

astrophoto gallery


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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #237111 - 10/31/04 03:03 PM

Quote:

All of my motor housing trimming was on the back and on the bottom towards the back. I took off more than I needed on the back unfortunately.





I see. How much of the plastic do you estimate needed to come off? Doesn't look like much from the photo, and you're saying that you took off too much!

You sure can't tell when it's assembled!

Charlie

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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #237114 - 10/31/04 03:07 PM

Quote:

I've had it outside a couple times but only looked at Saturn & the moon, since the full moon has killed any DSO viewing. I don't need the GOTO to find Saturn




True enough! The Moon will be gone soon, so you'll be looking for those dim fuzzies before long!

Charlie

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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #237263 - 10/31/04 07:23 PM

From Module 0.8 spur gear engineering data:
32T D=27.2 (standard SVP)
37T D=31.2 (LXD55/75)
40T Diameter=33.6mm (my adaptation)

So for the RA housing Aluminum, from 32T to 37T, approx. max. of 2mm has to be trimmed off. The worm shaft housing Aluminum may also have to be trimmed a little bit as well.

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Greg K.Administrator



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Re: GOTO for SkyView Pro new [Re: ccs_hello]
      #237362 - 10/31/04 09:43 PM

Quote:

I see. How much of the plastic do you estimate needed to come off? Doesn't look like much from the photo, and you're saying that you took off too much




The plastic I trimmed off of the bottom is necessary I could have left more on the backside. It was all trial and error but turned out ok.

Quote:

So for the RA housing Aluminum, from 32T to 37T, approx. max. of 2mm has to be trimmed off. The worm shaft housing Aluminum may also have to be trimmed a little bit as well.





The 2mm is about right, but I didn't have to do anything to the worm shaft housing at all.

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

astrophoto gallery


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Greg K.Administrator



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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #269934 - 12/02/04 07:42 PM

Update:

Well, I got my Autostar SVP outside last night for the first time to really test the performance. Up till now since doing this mod I've only been looking at Saturn and M42 and didn't really check the GOTO or tracking performance.

While I did find that GOTO and slewing is much improved, my SVP has some pretty horrific periodic error. I'm going to have to spend some time fixing that. I'm also going to have to try PEC to see how well that works.

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #270765 - 12/03/04 02:57 PM

Quote:

While I did find that GOTO and slewing is much improved, my SVP has some pretty horrific periodic error. I'm going to have to spend some time fixing that. I'm also going to have to try PEC to see how well that works.




I wonder if this is a result of your rebuild rather than an issue with the LXD-55 motors...

Charlie

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Greg K.Administrator



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Re: GOTO for SkyView Pro new [Re: Charlie Hein]
      #270817 - 12/03/04 03:44 PM

I don't think it's the motors. My SVP had bad PE before but I was hoping the rebuild would make it better. No such luck. I guess I need to work on my worm gear some more.

I made an image that demonstrates the PE, I'll post it later when I get home.

--------------------
Astro-Tech AT111EDT f/7 | AT72ED f/6 | Celestron CGEM
NexStar 11 GPS | Orion SkyView Pro 8EQ (w/ Autostar mod)
Canon EOS Rebel T2i (modded) | QHY5L-II mono

astrophoto gallery


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Re: GOTO for SkyView Pro new [Re: Greg K.]
      #271007 - 12/03/04 08:23 PM

Quote:

I don't think it's the motors. My SVP had bad PE before but I was hoping the rebuild would make it better. No such luck. I guess I need to work on my worm gear some more.




Keep us in the loop about what you do...

Quote:

I made an image that demonstrates the PE, I'll post it later when I get home.




looking forward to seeing it!

Charlie

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