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Equipment Discussions >> Mounts

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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Need help with Celestron AVX!
      #6315454 - 01/15/14 09:30 PM

I have a celestron AVX and when I try and polar align it the Azimuth axis feels loose. And by loose I mean if I push it, it can move like 1/4 of a degree even if the adjustment knobs are tightened all the way. Any ideas? -Also, does anyone recommend an illuminated reticule?

Edited by JPDucky (01/15/14 11:09 PM)


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Mr Greybush
scholastic sledgehammer
*****

Reged: 05/16/13

Loc: Virginia
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6315674 - 01/16/14 12:01 AM

check the alignment peg on the tripod to make sure its tight. A 12mm reticule from Celestron works fine some co's have 5mm's but my eye's can't use them.

Edited by Mr Greybush (01/16/14 12:02 AM)


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schluterdude
super member


Reged: 08/05/13

Loc: Centerville, OH
Re: Need help with Celestron AVX! new [Re: Mr Greybush]
      #6316121 - 01/16/14 10:09 AM

Also check that the center mounting bolt is tight, and it's really not just rocking around.

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John608
journeyman


Reged: 03/24/12

Loc: California
Re: Need help with Celestron AVX! new [Re: schluterdude]
      #6316522 - 01/16/14 01:26 PM

Hi JP,
In addition to John L.'s suggestion, make sure the bolt that holds the head on the tripod is tight, if it is loose the head will wobble in azimuth. As for reticles eyepieces yes they are worthwhile for alignment, 12mm or so is a popular focal length. Orion has a centering eyepiece with a of about 20mm fl with a 70 degree FOV that might work very well for aligning. Good Luck!

John G.


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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: John608]
      #6318912 - 01/17/14 03:14 PM

Thanks!

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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6319142 - 01/17/14 05:21 PM

Well, I just got home to take a look at it, and it doesn't matter how tight I screw it down, the mount still has to use the screws to make it turn, and because of that it wiggles. It is bolted down on the bottom and tightened in the front with the adjusters, but that leaves the back end to wiggle. Any suggestions?

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dragonslayer1
scholastic sledgehammer


Reged: 02/25/12

Loc: SLC, UT
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6319147 - 01/17/14 05:23 PM

take it apart and reassemble it, Kasey

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TCW
professor emeritus


Reged: 11/05/13

Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6319246 - 01/17/14 06:48 PM

If by some chance you have the legs extended all the way it will be quite wobbly. Retract them several inches and you will see a big improvement.

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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: TCW]
      #6319358 - 01/17/14 07:57 PM

I have done both, with no satisfactory conclusion.

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schluterdude
super member


Reged: 08/05/13

Loc: Centerville, OH
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6319368 - 01/17/14 08:03 PM

Once you are polar aligned, lock it down.

You are right, it will wobble when the center fixing bolt is loose. The adjustment knobs aren't meant to fix it in place. Line it up, tighten the fixing bolt.


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TCW
professor emeritus


Reged: 11/05/13

Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6319385 - 01/17/14 08:23 PM

Do you have the leg spreader/eyepiece holder installed and tightened up? Make sure the legs are fully spread. Other than that go over every nut, bolt and connection and make sure something is not loose. I just got my AVX and I am impressed with how solid it is.

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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: TCW]
      #6320808 - 01/18/14 04:18 PM

I've tightened down everything but it still is shaky.

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rdandrea
Carpal Tunnel
*****

Reged: 06/13/10

Loc: Colorado, USA DM59ra
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6320841 - 01/18/14 04:35 PM

Quote:

I've tightened down everything but it still is shaky.




Did you check to see if the azimuth pag is tight as suggested above? The azimuth adjusting screws press on a peg that is screwed into the mount base. If the scope still moves with both the azimuth adjusting screws tight against the peg, it either has to be a loose center bolt or a loose azimuth peg. Those are really the only degrees of freedom. If you've tightened the center bolt, that only leaves the azimuth peg.

Edited by rdandrea (01/18/14 04:38 PM)


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schluterdude
super member


Reged: 08/05/13

Loc: Centerville, OH
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6320851 - 01/18/14 04:38 PM

Are there any burrs on the base plate, or the head bottom?

Is the fixing bolt bottoming out before it has a chance to clamp?

Check the alignment pin again....

Perhaps it is time to break out a dial indicator and start looking around to find out exactly where the play is coming from...

Can you post a pic of where you think the play is? Can you see the gap in the mounting surface?

Are you only seeing it when looking through the scope? Are you tightening the clutches sufficiently? The dovetail clamp?


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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: rdandrea]
      #6320852 - 01/18/14 04:38 PM

The movement is on the opposite side of the peg. It's tight as it will ever be, and so is the screw on to the base. Mechanically, this makes no sense to me.

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schluterdude
super member


Reged: 08/05/13

Loc: Centerville, OH
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6320855 - 01/18/14 04:40 PM

So, 180 degrees?

REALLY stupid question, but you are sure you have the head seated on the baseplate correctly?


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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: schluterdude]
      #6320865 - 01/18/14 04:45 PM

I am. I'll fiddle underneath the head again when I get home, but tightened down with force of God it still moves. I can see the movement easily just by looking at the back of the scope. And yes, the movement is 180 degrees opposite the peg.

Edited by JPDucky (01/18/14 04:47 PM)


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TCW
professor emeritus


Reged: 11/05/13

Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6320935 - 01/18/14 05:25 PM

Perhaps another set of eyes might help?

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FacEngRet
journeyman


Reged: 02/27/13

Re: Need help with Celestron AVX! new [Re: TCW]
      #6321087 - 01/18/14 06:54 PM

My first AVX mount had this same movement caused by a sloppy fit between the bottom of the mount and the socket in the tripod. I put one layer of aluminum foil tape around the hub on the bottom of the mount to eliminate the gap. My second AVX is a much tighter fit and did not need the tape.

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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: FacEngRet]
      #6324766 - 01/20/14 06:41 PM

Here's a video.

http://www.youtube.com/watch?v=Ex9xbpn2Oq0&feature=youtu.be

I flipped the adjustment peg around to the other side and the problem persists.


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