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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

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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

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Charlie HeinAdministrator
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Reged: 11/02/03
Posts: 11211
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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

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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

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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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Skywatcher 150mm f8 Achro
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DM-6 With Sky Commander DSC
Astro-Tech AT80 Refractor f6.9 APO
Stellarvue 20x85 binos - Unimount
Kunming United Optics 7x50 binocs
Canon Rebel XT, Canon 20D, Canon 7D, Canon SXi
SBIG ST-8XE




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Charlie HeinAdministrator
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Reged: 11/02/03
Posts: 11211
Loc: 26.06.08N, +80.23.08W
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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Charlie HeinAdministrator
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Reged: 11/02/03
Posts: 11211
Loc: 26.06.08N, +80.23.08W
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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ccs_hello
Postmaster


Reged: 07/03/04
Posts: 5224
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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ccs_hello
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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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Greg K.Administrator



Reged: 12/11/03
Posts: 17634
Loc: Clifton Park, NY
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.

--------------------
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


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


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ccs_hello
Postmaster


Reged: 07/03/04
Posts: 5224
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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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.]
      #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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Greg K.Administrator



Reged: 12/11/03
Posts: 17634
Loc: Clifton Park, NY
Re: GOTO for SkyView Pro [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.

--------------------
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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Reged: 11/02/03
Posts: 11211
Loc: 26.06.08N, +80.23.08W
Re: GOTO for SkyView Pro [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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ccs_hello
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Reged: 07/03/04
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Re: GOTO for SkyView Pro [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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Charlie HeinAdministrator
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Reged: 11/02/03
Posts: 11211
Loc: 26.06.08N, +80.23.08W
Re: GOTO for SkyView Pro [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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