Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Equipment Discussions >> Mounts

Pages: 1 | 2 | 3 | (show all)
Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Tuning the ZEQ25, YouTube link
      #6126038 - 10/08/13 10:49 PM

I finally broke down and made a video on how I tune the ZEQ25. Had to break it into three vids for YouTube, but here's the link to Part 1:

http://youtu.be/-Cjqs4iDW1c

Hopefully you can find the other 2 videos on site?

Clear skies and don't break anything!

Paul


Post Extras: Print Post   Remind Me!   Notify Moderator  
Mkofski
Pooh-Bah
*****

Reged: 07/19/11

Loc: Greenfield, Indiana, USA
Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6126139 - 10/08/13 11:48 PM

Thanks Paul... I give it a shot tomorrow!

Post Extras: Print Post   Remind Me!   Notify Moderator  
Bill McNeal
sage


Reged: 10/07/07

Re: Tuning the ZEQ25, YouTube link new [Re: Mkofski]
      #6126251 - 10/09/13 01:32 AM

Thanks Paul. Will check them out!

Post Extras: Print Post   Remind Me!   Notify Moderator  
Justin neg3deg
member


Reged: 08/12/13

Loc: Arusha,Tanzania
Re: Tuning the ZEQ25, YouTube link new [Re: Bill McNeal]
      #6126365 - 10/09/13 05:09 AM

Great video, thanks Paul

Post Extras: Print Post   Remind Me!   Notify Moderator  
anat
professor emeritus


Reged: 06/03/04

Re: Tuning the ZEQ25, YouTube link new [Re: Justin neg3deg]
      #6126399 - 10/09/13 06:18 AM

Paul.

The major problems discussed in this forum are mainly all about the RA play and crosstalk noises. With your video instruction, there is nothing to worry about. Many thanks for your effort.

Anat


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: Tuning the ZEQ25, YouTube link new [Re: anat]
      #6126692 - 10/09/13 10:29 AM

Quote:

Paul.

The major problems discussed in this forum are mainly all about the RA play and crosstalk noises. With your video instruction, there is nothing to worry about. Many thanks for your effort.

Anat




Thanks Anat, hopefully there will be fewer issues now that users can see how to deal with them via a video.

Of course, some careful assembly on the part of iOptron would be ideal. I think the assembly line does not consist of highly skilled workers, unfortunately.

Best,

Paul


Post Extras: Print Post   Remind Me!   Notify Moderator  
ramasule
member


Reged: 04/12/12

Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6127032 - 10/09/13 01:42 PM

http://www.youtube.com/watch?v=-Cjqs4iDW1c #1

http://www.youtube.com/watch?v=JkXnuGQNYS8 #2

http://www.youtube.com/watch?v=ejlnH58RR0w #3


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: Tuning the ZEQ25, YouTube link new [Re: ramasule]
      #6128259 - 10/10/13 01:16 AM

Just an update, someone asked me a good question today. He wanted to know how he could tell if he need to tune his mount since it was being delivered new.

I 'thunked' about that and came up with this base test on my mount.

Set your mount up with the counterweight shaft in a horizontal position and the tension screw turned all the way in.

Put the counterweight on, flush with the end of the safety cap.

Tension screw all the way in ... no slippage.

One turn out (360 degrees)..no slippage.

Two turns out...no slippage.

Three turns out...no slippage.

Four turns out...no slippage.

Five turns out..slipped if I just nudged the c/w.

So, the mount, properly adjusted, should hold against the counterweight, with the tension screw backed 4 turns out.

I guess if your mount slips at 1 or 2 turns out...you need to watch the videos and get your tools out?

Clear skies...Paul


Post Extras: Print Post   Remind Me!   Notify Moderator  
rkayakr
sage
*****

Reged: 10/27/10

Loc: Northeast Ohio
Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6128491 - 10/10/13 07:58 AM

Paul

Thanks for the useful diagnostic.

How about a comprehensive iEQ45 tune up video?

Bob


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: Tuning the ZEQ25, YouTube link new [Re: rkayakr]
      #6128568 - 10/10/13 09:01 AM

Quote:

Paul

Thanks for the useful diagnostic.

How about a comprehensive iEQ45 tune up video?

Bob




Thanks Bob, as far as the iEQ45, that would be a 5 or 6 part video upload. Maybe on some snowbound, blustery day, when I absolutely nothing else to do....:)

Best,

Paul


Post Extras: Print Post   Remind Me!   Notify Moderator  
WhistleStop
Pooh-Bah
*****

Reged: 09/07/07

Loc: Grafton, Ontario
Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6128669 - 10/10/13 09:49 AM

Paul
You are a "god send" ! I bought my ZEQ25 and immediately found a bad worm in the RA, iOptron was great and sent me a new worm and instructions ( my choice to fix it myself). After the self-repair I found the non guided PE to be max +/- 7.5 arcsec and the guided and corrected to be max +0 / - 0.85.... truly amazing.
To be clear that was done with a light load DSLR, lens, 50mm finder and guide cam. I am really impressed by this mount! And just as impressed by your efforts to educate all of us in tweaking its performance. Thank you, Paul.
Secretly though, I love the videos as you are a dead ringer for the cult favorite 'Winnebago Man'
Keep up the great work.
Cheers
Lynn
NightoverOntario.com


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: Tuning the ZEQ25, YouTube link new [Re: WhistleStop]
      #6128781 - 10/10/13 10:49 AM

Thanks so much Lynn.

I guess I'm going to have to Google 'Winnebago Man' to see who's going around pretending to be me?

Glad you enjoy the vids, and I appreciate the nice comments.

Oh, I can confirm the tracking and PE capability of this wonderful little mount too..it's just incredible for a mount in this price range.

All the best,

Paul

Edited by Astronewb (10/10/13 10:52 AM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Hunlon
member


Reged: 09/19/13

Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6129593 - 10/10/13 05:51 PM

Great videos Paul.

A stark contrast to the help that iOptron have been giving me. When I reported that I was measuring PE at 65 arc secs P-P they said it was a little high but there is no designed PE criteria. They also said that the average PE being reported was 30 arc secs P-P. They sent me 2 pdfs to fix the play in the worm drive, which by the way were very confusing, but I found no play in the mechanism. So I just had to settle with what I got - just a variation in the manufacturing.

Your videos, however, indicate that with a little adjustment and replacement of critical parts like the springs I might really have a great mount in my possession. I now know how my mount should behave.

Kudos,
Hunlon.


Post Extras: Print Post   Remind Me!   Notify Moderator  
gramaglia
super member


Reged: 04/02/12

Re: Tuning the ZEQ25, YouTube link new [Re: Hunlon]
      #6129957 - 10/10/13 09:44 PM

Thanks for providing another very useful video Paul. I wasn't aware you could access the brass screws without dismounting the worm assembly, I major time savings.

The only thing I would add for those that don't have a modified pulley wheel is on how to reattach the belt on the wheel.
Replace the wheel without tightening the allen screw; make sure the screw is facing up as close as possible to the worm assembly while still being able to be accessed by an allen wrench.
Place the allen wrench on the screw, then attach as much of the belt that will easily get on. At this point pull on the allen wrench allowing the wheel to rotate, this will allow the rest of the belt to catch the wheel.
Once the belt is completely around the wheel even though the outer half will be overhanging tighten the allen screw.
Now easily push the belt on to the wheel so that's it's perpendicular to the motor.


Post Extras: Print Post   Remind Me!   Notify Moderator  
ramasule
member


Reged: 04/12/12

Re: Tuning the ZEQ25, YouTube link new [Re: gramaglia]
      #6130238 - 10/11/13 12:23 AM

That's what I did gram, good point...

I just ripped my whole mount apart (I had no previous problems)
My springs where 1/2 inch but I had the long tension screw. I put a spring inside and slightly longer as Paul has.

Most annoying part, getting the Dec black cover on and off, those screws were annoying.

My side to side adjustments (the part with the small locking screw and the big screw) were to tight. I loosened them up a bit ( we will see how that goes).

Also my Dec backlash was a little sloppy before... The grub screw on the Dec gear was loose, boom fixed.

This is a nice mount to work on, very easy to take apart.

If your having problems squeezing the black cover off, your getting hanged up on the port plugs. Put a small flat in there and gently pry the black case away while pulling up. This is the part Paul suggests to file.

In conclusion thanks Paul for the awesome videos and tricks. I look forward to trying out my tweeks.

Ram


Post Extras: Print Post   Remind Me!   Notify Moderator  
pippo
member


Reged: 01/12/13

Loc: Paris (FR), Pantelleria (IT)
Re: Tuning the ZEQ25, YouTube link new [Re: ramasule]
      #6132514 - 10/12/13 06:25 AM

Dear Paul,
I tuned my mount following your very clear instructions (thanks a lot for your help!). The problem of the RA axis is slightly improved.

Indeed, before the tuning, with counter-weight flushed at the end of the safety cap, the RA axes was slipping even with the screw all the way in. After the tuning the RA axis slips after 1/2 of the turn out.

This could be due to the too weak original springs of my mount (my springs of both axes are uncut and 14mm long).

Could you please repeat on your mount the test with the mount original springs? In this way, we can see if the problem is related to the springs or to the mount....

Thanks

Francesco

Edited by pippo (10/12/13 09:20 AM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
ramasule
member


Reged: 04/12/12

Re: Tuning the ZEQ25, YouTube link new [Re: pippo]
      #6133819 - 10/12/13 08:31 PM

Pippo,

I have original uncut springs, with uncut screws and I did not experience this slipping. Make sure the ball is seated inside the spring when you reassemble. Take the black cover off and view the RA action as you load it with the counterweight.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: Tuning the ZEQ25, YouTube link new [Re: ramasule]
      #6134068 - 10/12/13 11:38 PM

Quote:

Could you please repeat on your mount the test with the mount original springs? In this way, we can see if the problem is related to the springs or to the mount....




Sorry Francesco, took me a while to find the original springs. Installed the original (w/cut coil up)

Counterweight flush with safety cap. Mount in horizontal position.

One half turn..no slippage

One turn..no slippage

One and one half turns..no slippage

Anything more than one and one half...slips.

So the dual spring set contributes quite a bit of holding force on the worm housing.

Ciao,

Paul


Post Extras: Print Post   Remind Me!   Notify Moderator  
pippo
member


Reged: 01/12/13

Loc: Paris (FR), Pantelleria (IT)
Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6134320 - 10/13/13 04:36 AM

Ok thanks,
so in term of holding force 1.5 turns with the original spring is equivalent to 5 turns with your double springs.
This mean that you can safely use on the mount a much stronger holding force without damaging the motors!
I asked iopteron about changing the springs with stiffer one they answered:
"We don't recommend changing the spring to a strong one; which might risk excess force to the motor if it is not properly adjusted. If customer choose to replace, please
double check the tension adjuster is released EVERY TIME when operate the mount."
What is your experience? If the force is too large, you just get an overcurrent message and the motor stop, or you can burn the motors? How do you judge that the holding force is too large?

PS instead of replacing the spring I just used some refolded aluminum foil to make a 2-3mm thick disk to be inserted in the spring-housing inside the screw before inserting the spring. In term of holding force, the effect of shortening the spring-housing with the disk is equivalent to the use of a stiffer (or longer) spring. However with the disk you avoid to look for new springs and, by varying the thickness of the disk (just adding some extra layers of foil), you can rapidly and finely tune the force.

Edited by pippo (10/13/13 05:39 AM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: Tuning the ZEQ25, YouTube link new [Re: pippo]
      #6134716 - 10/13/13 10:43 AM

Quote:

PS instead of replacing the spring I just used some refolded aluminum foil to make a 2-3mm thick disk to be inserted in the spring-housing inside the screw before inserting the spring. In term of holding force, the effect of shortening the spring-housing with the disk is equivalent to the use of a stiffer (or longer) spring. However with the disk you avoid to look for new springs and, by varying the thickness of the disk (just adding some extra layers of foil), you can rapidly and finely tune the force.




Hello Pippo,

Be very careful with adding material (foil, washers, etc) inside the screw to increase the tension.

The danger is that, if you add too much material, when the screw is turned in, the spring coils may compress all the way and reach 'coil bind' Then you don't have a spring anymore, just a solid piece of metal.

If you run a coil bound spring down against the worm housing, you will get OC messages, and the real possibility of burning out an encoder motor.

Do this, remove your spring, put it in a vise or in a pair of pliers. Measure the distance (length) of the spring, then compress the spring and re-measure the distance. The difference between the two is the maximum free space available. Avoid approaching this figure, make sure whatever spacer you use is less than that figure.

With dual springs, or a heavier spring, even when the tension screw is run all the way down, there is room for the worm housing to move upwards away from the ring, and will not damage the motor. I never even get any OC messages.

Hope that helps,

Paul


Post Extras: Print Post   Remind Me!   Notify Moderator  
pippo
member


Reged: 01/12/13

Loc: Paris (FR), Pantelleria (IT)
Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6135356 - 10/13/13 04:30 PM

Indeed you are correct. It is too dangerous to add material especially with my 14mm length spring. The remaining space is just 2mm and it is possible to reach the situation you are describing. So I agree with you that is safer to find a stronger spring....

Post Extras: Print Post   Remind Me!   Notify Moderator  
Hunlon
member


Reged: 09/19/13

Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6137628 - 10/14/13 06:30 PM

Hi Paul,

It seems to me that if the spacer brings the total length to 1/2" you would have the same spring tension as the original spring. This is because F=kx, where k is the stiffness and x is the compression and it doesn't matter if the spring is 1/4" long or 1/2" long, compressing it by 1/8" will generate the same force. I agree that making the total length longer than 1/2" will risk 'coil bind' so would not be a good idea.

The fact that you get better performance by adding an inner spring indicates that the original spring stiffness is too low and should be increased. The ball is now in iOptron's court. I just hope they've made the appropriate adjustments to their production line.


Post Extras: Print Post   Remind Me!   Notify Moderator  
ramasule
member


Reged: 04/12/12

Re: Tuning the ZEQ25, YouTube link new [Re: Hunlon]
      #6137728 - 10/14/13 07:50 PM

Yes if you compress 1/8" on both springs same force, however a 18mm spring will compress further then a 15mm spring with 3mm spacers.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Hunlon
member


Reged: 09/19/13

Re: Tuning the ZEQ25, YouTube link new [Re: ramasule]
      #6137817 - 10/14/13 08:40 PM

Quote:

Yes if you compress 1/8" on both springs same force, however a 18mm spring will compress further then a 15mm spring with 3mm spacers.




Point taken. But the amount of force applied to the worm is proportional to the compression of the spring. This compression is achieved by screwing in the tension knob. The maximum force available is the amount of compression - it doesn't matter how long the spring is. Having a longer spring means that your range of compression is longer and therefore the maximum force is higher but if your screw only compresses the spring by, say, 6mm you will only get 6mm worth.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Tony Finnerty
member


Reged: 03/06/13

Loc: Nevada City, California
Re: Tuning the ZEQ25, YouTube link new [Re: Hunlon]
      #6137897 - 10/14/13 09:31 PM

Thank you, Paul, for the tuning videos. I replaced each tensioning spring with two 0.5 inch springs as suggested, then did the whole tuning thing for both axes. Last night it just worked. PHD gave Osc-index values of 0.16 to 0.27 and RMS 0.10 to 0.15 through approx. 400 subs totalling 5 hours exposure time, with round stars.

Contrast was less in the moon-bright sky, but autoguiding worked well, even though missed guiding steps due to star mass variations (twinkling) were frequent. With short (1 minute using my 100mm, f/2.0 lens) exposures due to sky brightness, I didn't need autoguiding at all. The tuned ZEQ25 is a keeper.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: Tuning the ZEQ25, YouTube link new [Re: Tony Finnerty]
      #6137919 - 10/14/13 09:44 PM

Quote:

Thank you, Paul, for the tuning videos. I replaced each tensioning spring with two 0.5 inch springs as suggested, then did the whole tuning thing for both axes. Last night it just worked. PHD gave Osc-index values of 0.16 to 0.27 and RMS 0.10 to 0.15 through approx. 400 subs totalling 5 hours exposure time, with round stars.

Contrast was less in the moon-bright sky, but autoguiding worked well, even though missed guiding steps due to star mass variations (twinkling) were frequent. With short (1 minute using my 100mm, f/2.0 lens) exposures due to sky brightness, I didn't need autoguiding at all. The tuned ZEQ25 is a keeper.




Thanks for the update. That sounds like what the mount is capable of producing, given that all the 'variables' are removed.

I have a collection of PHD graph screenshots from the past several months, that most people would frame. The smoothness of the mount when tracking is an indication of how little periodic error the mount really has.

It's all due to the Z Balanced design, which just puts the offset weight where the mount can easily deal with it.

I don't see any need for a mount other than the Z for AP, especially in this payload and price range.

Cheers,

Paul


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6137925 - 10/14/13 09:48 PM

Hunlon and Ramasule. You are neglecting one important piece of data when it comes to compression springs. The wire diameter of the spring. Two springs, of identical length, but one has .012" spring wire, the other has .010".

The spring with the larger diameter wire will coil bind first, every time, at maximum compression.

The only springs that are not plagued with coil bind, are conical springs, which, if designed correctly will collapse into a space equal to the diameter of the wire.

Let's move on...

Paul


Post Extras: Print Post   Remind Me!   Notify Moderator  
ramasule
member


Reged: 04/12/12

Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6138074 - 10/14/13 11:18 PM

I don't even know what I'm moving on from.

What I do know is that I was supposed to get clear nights 4 nights in a row now and I didnt even get 1

DRATS


Post Extras: Print Post   Remind Me!   Notify Moderator  
Bill McNeal
sage


Reged: 10/07/07

Re: Tuning the ZEQ25, YouTube link new [Re: ramasule]
      #6139635 - 10/15/13 07:05 PM

Paul, in Part 2 at around 2-5 minutes for worm mesh adjustment, it appears you loosen the 3 allen bolts, tighten the tension screw with a spacer, then tighten the allen bolts.

Which part actually adjusts the worm mesh and how can you tell what the right amount is?


Post Extras: Print Post   Remind Me!   Notify Moderator  
ramasule
member


Reged: 04/12/12

Re: Tuning the ZEQ25, YouTube link new [Re: Bill McNeal]
      #6139886 - 10/15/13 09:56 PM

The metal part that you loosened the 3 bolts on is the tensioner. What sets the mesh is,

You tighten down hard on a 1-2 mm spacer, this will slide the metal tensioner around to give you a near bind mesh with the screw that spacer amount. This is what is setting the proper mesh in regards to jsing the 1/2 springs and ball bearing.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: Tuning the ZEQ25, YouTube link new [Re: Bill McNeal]
      #6139977 - 10/15/13 10:53 PM

Quote:

Paul, in Part 2 at around 2-5 minutes for worm mesh adjustment, it appears you loosen the 3 allen bolts, tighten the tension screw with a spacer, then tighten the allen bolts.

Which part actually adjusts the worm mesh and how can you tell what the right amount is?




Hi,

With the 3 hinge lock bolts loose, run the tension screw all the way down onto the spacer. That will force the worm into the concave area of the ring and center it. There is nothing else, the worm establishes a mesh because you have run it to the bottom of the ring, it can't go anywhere else, you just have to keep it centered over the ring when tightening the hinge bolts. The tension screw spring and ball determine how much force is applied to keep the worm in mesh with the ring gear when operating.

Before tightening the 3 lock screws, eyeball the hinge base to make sure it is aligned with the raised base on the mount, ie; not angled right or left.

Once you determine it all looks square, tighten the 3 cap screws locking the hinge base to the mount. Then back off the tension screw and remove the spacer.

You can now install the ball and spring, tighten it all the way down and back out 1 turn. Grab the cogged belt on the worm pulley and roll it back and forth to make sure the worm and ring gear turn easily with little force. (It's easier with the belt because the worm pulley is hard to access in the housing.

Now reinstall the encoder motor and remaining parts and go have a party....;)

Hope that helps?

Paul


Post Extras: Print Post   Remind Me!   Notify Moderator  
cuivienor
professor emeritus


Reged: 10/07/10

Loc: Tokyo, Japan
Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6140037 - 10/15/13 11:22 PM

Paul, thank you so much for the videos!

My SmartEq Pro recently broke (i.e. the RA axis would happily and smoothly turn when locked). I did manage to fix it (iOptron Support sent me a full diagram/blueprint of the axis components so I dissassembled and reassembled and now it works again), but decided it was time to go to the ZEQ25GT. I will report back once I have it!

Cheers,

Yannick


Post Extras: Print Post   Remind Me!   Notify Moderator  
Bill McNeal
sage


Reged: 10/07/07

Re: Tuning the ZEQ25, YouTube link new [Re: cuivienor]
      #6140084 - 10/15/13 11:53 PM

Thanks Paul!

My mount needs tuning based on your test, as the CW shaft gives when tension screw is turned out 720 degrees. Does this mean its tracking is affected or payload reduced?

Also your videos didn't go over spring replacement. It sounds like you tested after tuning by replacing the original springs and the big difference indicates the spring is the biggest factor in reducing RA play. Did you get them from iOptron or hardware store? If I have to ask the Home Depot guy for half inch springs, what else should I specify regarding the part?


Post Extras: Print Post   Remind Me!   Notify Moderator  
ramasule
member


Reged: 04/12/12

Re: Tuning the ZEQ25, YouTube link new [Re: Bill McNeal]
      #6140133 - 10/16/13 12:32 AM

Bill check the other zeq thread it has all the info you need. If you are in the states McMaster Carr probably has springs.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Bill McNeal
sage


Reged: 10/07/07

Re: Tuning the ZEQ25, YouTube link new [Re: ramasule]
      #6141651 - 10/16/13 07:37 PM

OK thanks.

So replace the tension screw spring with two springs, outer and inner, half-inch.

Is everyone doing this for the RA tension screw, or also for DEC?


Post Extras: Print Post   Remind Me!   Notify Moderator  
mikeboni
newbie


Reged: 10/05/13

Re: Tuning the ZEQ25, YouTube link new [Re: Bill McNeal]
      #6141925 - 10/16/13 10:05 PM

Hiya folks,

I'm a new ZEQ25 owner, very grateful to Paul for making the tune up videos. I'd like to replace my springs, but HomeDepot had nothing, and the springs at the local Ace Hardware were close but not quite right. I just spent some time at McMaster Carr looking for springs with the right specs, but no luck there either, at least not with the specs Paul posted.

Paul, where'd you get yours? Or anyone else know of a good supplier?


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: Tuning the ZEQ25, YouTube link new [Re: mikeboni]
      #6141980 - 10/16/13 10:34 PM

Quote:

Hiya folks,

I'm a new ZEQ25 owner, very grateful to Paul for making the tune up videos. I'd like to replace my springs, but HomeDepot had nothing, and the springs at the local Ace Hardware were close but not quite right. I just spent some time at McMaster Carr looking for springs with the right specs, but no luck there either, at least not with the specs Paul posted.

Paul, where'd you get yours? Or anyone else know of a good supplier?




I buy all my supplies from Reid Supply, the springs are number S-780 and S-555, but the shipping will kill you unless you're buying in quantity.

Best...Paul


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: Tuning the ZEQ25, YouTube link new [Re: Bill McNeal]
      #6141987 - 10/16/13 10:36 PM

Quote:

OK thanks.

So replace the tension screw spring with two springs, outer and inner, half-inch.

Is everyone doing this for the RA tension screw, or also for DEC?




Hi Bill, I use them on both RA and DEC. Replacing the stock spring with these will give you some extra worm tension and is probably all your particular mount needs?

Cheers,

Paul


Post Extras: Print Post   Remind Me!   Notify Moderator  
Bill McNeal
sage


Reged: 10/07/07

Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6142067 - 10/16/13 11:45 PM

Thanks Paul.

Anyone know if iOptron is using the new springs? If so, we can ask them to send the parts for user replacement.


Post Extras: Print Post   Remind Me!   Notify Moderator  
ramasule
member


Reged: 04/12/12

Re: Tuning the ZEQ25, YouTube link new [Re: Bill McNeal]
      #6142164 - 10/17/13 01:02 AM

You do not need new springs if they are 1/2 inch long and your mount holds your cw 2 turns out.

Also it does not need to be exact when adding springs, also if you add to much and you wreck your motor when you hit something, paper weight.

If you want stiffer and your main spring is 1/2 long then just find a spring that fits inside of it and go from there.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astronewb
scholastic sledgehammer
*****

Reged: 09/19/11

Loc: Connecticut
Re: Tuning the ZEQ25, YouTube link new [Re: ramasule]
      #6142367 - 10/17/13 07:27 AM

Quote:

also if you add to much and you wreck your motor when you hit something, paper weight.




Ramasule is right about the spring length. But not so right about wrecking your mount if you hit something (tripod).

Because some AP'ers will at one time or another run their cameral into a tripod leg, this is what will happen:

Tracking speed is extremely slow, and the encoder motor has a ton of torque because of the planetary gear reduction.

So, when the mount meets an immovable object (tripod) the motor will force the hinge base loose from under the locking screws and move it until all the free space in the hinge holes is taken up, then the current load will trip a Overcurrent message and the mount will stop tracking.

At that point, you will need to disassemble the mount and reseat the worm mesh (the worm housing will be canted).

Been there, done that, with no detrimental results...:)

Cheers...Paul


Post Extras: Print Post   Remind Me!   Notify Moderator  
ramasule
member


Reged: 04/12/12

Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6142720 - 10/17/13 11:16 AM

Well john paul this is something I don't want to try, ill take your word for it.

Regardless, it seems a couple of you are running out to "fix" a good mount. I encourage mount disassembly if you like that sort of thing and arent rushed. However as stated if your mount holds well, and your not mechanically inclined, you probably should not take it appart. Myers mount was fine from factory, however I enoy taking things apart. So I grabbed a bunch of springs and tried them all out. There is no set spring tension, just have fun.

Clear skies


Post Extras: Print Post   Remind Me!   Notify Moderator  
Ryuno
sage


Reged: 05/09/13

Loc: Tokyo
Re: Tuning the ZEQ25, YouTube link new [Re: ramasule]
      #6144279 - 10/18/13 05:44 AM

Just for you information. Yesterday, iOptron Support sent me the following mail:

"I would like to share some info with you. A customer sent his ZEQ25 mount in for adjustment after he watched Paul’s video at CN and he determined he had a lot play on his mount and the RA slipped with 20 lbs payload. We received his mount and checked by our technician, both RA and DEC had almost zero play and the RA did not slip when 20 lbs payload was applied. However, if the DEC was not balanced, the RA would slip.

We would not recommend putting the CW at the end of the shaft and then test the RA slippage by loosening the tension adjuster by 1, 2, … turns. Z balanced mount is designed to work ideally when both DEC and RA are well balanced. We would strongly recommend balance the DEC first and then RA. We would suggest customers never shack/wiggle the CW shaft to test any play, such action could create play."


Post Extras: Print Post   Remind Me!   Notify Moderator  
Ryuno
sage


Reged: 05/09/13

Loc: Tokyo
Re: Tuning the ZEQ25, YouTube link new [Re: Astronewb]
      #6144291 - 10/18/13 06:05 AM

Quote:

...Before tightening the 3 lock screws, eyeball the hinge base to make sure it is aligned with the raised base on the mount, ie; not angled right or left...

Paul



I just would like to stress that this step is crucial. The first time I did not do this, with the following result, when trying to slew in RA at speed 8. Listen to the sound. At 2 turns out, it stopped with RA overcurrent. (1 turn = 360 degrees)

Tension screw 4 turns out
3.5 turns out
3 turns out
2.5 turns out
2 turns out (motor-stop with RA overcurrent)

All the best for your tuning.
Heinz


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1 | 2 | 3 | (show all)


Extra information
24 registered and 39 anonymous users are browsing this forum.

Moderator:  Dave M, richard7, bilgebay, iceblaze 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 2017

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics