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Equipment Discussions >> Mounts

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zjc26138
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Reged: 02/24/05

Loc: Mingo Junction, Ohio
Re: Some issues with iOptron iEQ45m new [Re: Phillip Easton]
      #5679391 - 02/14/13 12:50 PM

I took a video of slop.

http://www.youtube.com/watch?v=PPbYXwVPIoE&feature=youtu.be


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EFT
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Reged: 05/07/07

Loc: Phoenix, AZ
Re: Some issues with iOptron iEQ45m new [Re: zjc26138]
      #5679416 - 02/14/13 01:02 PM

Quote:

I took a video of slop.

http://www.youtube.com/watch?v=PPbYXwVPIoE&feature=youtu.be




While that looks a bit on the loose side, as long as the worm assembly is moving out from the wheel and not laterally (i.e., side to side), then the action is generally correct. The other video that was linked to earlier seemed to show a lot of lateral movement in the assembly and that would be a real problem, especially with gotos and changing direction.

If the spring tension is not high enough, then the worm will want to slide out of the teeth of the wheel and tilt outward too easily. This would be a problem with an off-balance load as well as when starting a slew, particularly at high speed since the worm would tend to push out momentarily and then slide back into place. The problem is, if the spring tension is too high, then it will excentuate all the flaws in the worm and wheel (which inevitably exist in gear systems). Finding the correct tension is the tricky part. I find that I spend a lot of time playing with a spring loaded system until I am happy with it. While the benefit is less backlash, the adjustment is much more difficult to make than a solid-mounted worm.


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zjc26138
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Re: Some issues with iOptron iEQ45m new [Re: EFT]
      #5679556 - 02/14/13 01:57 PM

Thanks for the info Ed.

Yeah the worm assembly is only moving out, and not side to side. So as long as I properly balance whatever scope I have mounted I should be alright?


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EFT
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Re: Some issues with iOptron iEQ45m new [Re: zjc26138]
      #5679566 - 02/14/13 02:02 PM

Quote:

Thanks for the info Ed.

Yeah the worm assembly is only moving out, and not side to side. So as long as I properly balance whatever scope I have mounted I should be alright?




Balance will be important, but if the worm is too loose, then the mass will get you when the mount starts to move, particularly at higher speeds. So you might need to tighten it up if you find it having problems.


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zjc26138
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Re: Some issues with iOptron iEQ45m new [Re: EFT]
      #5679584 - 02/14/13 02:11 PM

Alright thanks for the info.

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mega256
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Reged: 05/10/07

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Re: Some issues with iOptron iEQ45m new [Re: zjc26138]
      #5680083 - 02/14/13 07:23 PM Attachment (20 downloads)

zjc26138
Your video looks just like they way my mount is..And mine works great with a C11-hd ,with the 10" extension bar and
the 2 11-lb weights. My goto's and tracking is right on..
I do have the 8407 hc and allways do an electronic balance after doing one by eye.Mine looks and sounds just like your's.Balance is important,as in any mount.

Edited by mega256 (02/14/13 07:27 PM)


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zjc26138
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Re: Some issues with iOptron iEQ45m new [Re: mega256]
      #5680306 - 02/14/13 10:09 PM

That's good to hear. Beautiful setup by the way. If I had the funds Id spring for a C9.25 or the C11. I wonder if it would be worth while to do the upgrade to the 8407?

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Astronewb
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Re: Some issues with iOptron iEQ45m new [Re: zjc26138]
      #5680338 - 02/14/13 10:31 PM

Zach, I checked the video several times, your DEC axis is definitely not right,it not only has up and down motion, if you check the video closely..it also has side to side motion. You should be checking with fingertip pressure only.

My mount's DEC, even when gripping the ota like a bat and moving it, has no appreciable play. I would suspect you probably have 3 issues.

1. Your hinge pin holes are elongated, allowing the hinge pin to float around in the hinges.

2. Your hinge pin to housing clearance is excessive.

3. The hinges are misaligned or loose as well.

Your RA seems to be okay...I could tell you were really rocking it, too much in fact..that just cams the worm away from the gear.

Here's an image that illustrates the hinge pin wear:


RA and DEC hinges iEQ45 by Astronewb2011, on Flickr

Here's how you fix it permanently:

RA hinge with bushing installed by Astronewb2011, on Flickr

If your mount is still under warranty, email iOptron for a new set of DEC hinges and replacement instructions.

Regards,

Paul


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zjc26138
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Re: Some issues with iOptron iEQ45m new [Re: Astronewb]
      #5680501 - 02/15/13 12:46 AM

Thanks again for the info Paul. I'll take another look at my mount in the am and report back.

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zjc26138
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Re: Some issues with iOptron iEQ45m new [Re: zjc26138]
      #5681225 - 02/15/13 11:31 AM

I took some photo's of the hinges.

RA Motor: http://www.flickr.com/photos/39872531@N05/8476688314/in/photostream/

RA Motor: http://www.flickr.com/photos/39872531@N05/8476688686/in/photostream/

Dec Motor: http://www.flickr.com/photos/39872531@N05/8475598339/in/photostream/

Dec Motor: http://www.flickr.com/photos/39872531@N05/8475598349/in/photostream/

Edited by zjc26138 (02/15/13 11:32 AM)


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zjc26138
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Re: Some issues with iOptron iEQ45m new [Re: zjc26138]
      #5683928 - 02/16/13 05:30 PM

Any thoughts on those pictures?

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mgwhittle
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Re: Some issues with iOptron iEQ45m new [Re: zjc26138]
      #5684042 - 02/16/13 06:42 PM

One of your DEC hinges looks out of round to me, but you may need to actually disassemble it fully to make sure about all of them. Based on your video, you definately have way too much play on the DEC axis.

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EFT
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Re: Some issues with iOptron iEQ45m new [Re: zjc26138]
      #5684151 - 02/16/13 07:56 PM

Quote:

Any thoughts on those pictures?




Plenty of thoughts. None of them good.


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zjc26138
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Re: Some issues with iOptron iEQ45m new [Re: EFT]
      #5684155 - 02/16/13 07:59 PM

That's what I thought. . I guess I'll be calling iOptron on Monday for parts. :/

Time to start saving for an AP900.

Edited by zjc26138 (02/16/13 08:00 PM)


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mgwhittle
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Re: Some issues with iOptron iEQ45m new [Re: zjc26138]
      #5684170 - 02/16/13 08:12 PM

Quote:

That's what I thought. . I guess I'll be calling iOptron on Monday for parts. :/

Time to start saving for an AP900.




Now you are talking. Once you get a 900GTO you will be spoiled!


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zjc26138
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Re: Some issues with iOptron iEQ45m new [Re: mgwhittle]
      #5684186 - 02/16/13 08:27 PM

I've never used an AP mount, but I have heard so many great things about them. . It's the only logical choice. Either the 900 or a used 1200.

Edited by zjc26138 (02/16/13 08:28 PM)


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Astronewb
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Re: Some issues with iOptron iEQ45m new [Re: zjc26138]
      #5684278 - 02/16/13 09:23 PM

Quote:

Any thoughts on those pictures?




Yep..I looked at your DEC hinge pin at full resolution..you have the dreaded 'oval hole' syndrome....:)

When/if you replace the hinges, check the play of the worm itself...it's tensioned by the large brass nut. If it has any side to side play..loosen the 2mm lock screw, and tighten the brass nut with a pair of lock ring pliers (or a couple of small nails, driven through a piece of wood, spaced correctly to fit the holes.) Caution, if you do this, do not overtighten the nut..just screw it in enough to remove the slack.

Cheers, and good luck,

Paul


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zjc26138
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Re: Some issues with iOptron iEQ45m new [Re: Astronewb]
      #5684344 - 02/16/13 10:13 PM

Thanks for the info Paul. I'm not 100 % sure I should change the dec pins considering I have been able to guide 7 minutes. Though the last few times I haven't been able to go past a few minutes. Though that's my fault/light pollution more than anything. I have all the time in the world to fix the mount now (out of work). I assume they are not to hard to change. I'll give iOptron a call Monday. Hopefully I can get the parts soon. Though with my main imaging scope out of service right now it's not a big hurry.

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orlyandico
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Re: Some issues with iOptron iEQ45m new [Re: zjc26138]
      #5684651 - 02/17/13 05:33 AM

there's a used 1200 for $8K on the mart.

there was a used 900 CP2 for $5.4k last week. that's less than my mach1. did i regret it.. not really. upgrading to a CP3 would cost $1k.

the only time my mach1 will not be enough for me is if i want to put a CDK12.5 on it. that's not gonna happen till i have a permanent obs.

until that time.. the mach1's 30lb (vs 55lb for the 900) wins.


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zjc26138
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Re: Some issues with iOptron iEQ45m new [Re: orlyandico]
      #5685020 - 02/17/13 11:36 AM

If I was working I probably would have already bought a used 900. Until I have the funds I'll continue to window shop.

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