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Equipment Discussions >> Mounts

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FacEngRet
member


Reged: 02/27/13

Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6324808 - 01/20/14 07:19 PM

Check to see if the alignment peg is too high and not allowing the mount to seat properly on the tripod. You can remove the peg and then install the mount on the tripod to see if it seats better.

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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: FacEngRet]
      #6324886 - 01/20/14 08:01 PM

I just tried that, It was like pouring gasoline on a fire. It gave it free range of motion.

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LateViewer
Pooh-Bah
*****

Reged: 11/17/05

Loc: Manhattan
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6325621 - 01/21/14 07:46 AM

I don't have an answer but I loved your comment at the end. It is quite a problem.

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Patrick
Postmaster
*****

Reged: 05/16/03

Loc: Franklin, Ohio
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6325765 - 01/21/14 09:27 AM

Quote:

I just tried that, It was like pouring gasoline on a fire. It gave it free range of motion.




That makes it pretty obvious that your center bolt is not clamping the mount head to the tripod with enough (or any) force. If it were you would not be able to budge the mount head. Something is preventing the center bolt from clamping properly. Even if the center bolt seems tight it's not clamping which means something is bottoming out before the center bolt can clamp the mount head to the tripod base. You should be getting a good clamp force on the center bolt whether the spreader bar is attached or not.

Take some PICTURES! That would really help us see what's going on. It's not that complicated and should be an easy fix what ever it is.

Patrick


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Patrick
Postmaster
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Reged: 05/16/03

Loc: Franklin, Ohio
Re: Need help with Celestron AVX! new [Re: Patrick]
      #6325789 - 01/21/14 09:45 AM

PS...I looked at your video but it doesn't provide enough information. Could you take a close up picture of the tripod head without the mount on it and with the center bolt protruding up? Also, could you take a close up picture of the bottom of the mount head to see if there are any burrs or protrusion that are causing the mount head to not rest on the tripod head. Also, measure the height of the center bolt protrusion and the depth of the counterbore in the tripod head to make sure the center bolt protrusion on the mount head is not bottoming out before the mount head comes to rest on the tripod head.

One other potential problem area is that the threads on the center bolt may be bottoming out in the mount head. This could happen if the hole is not deep enough. Try putting a washer between the bottom of the tripod head where the center bolt clamps on the underside of the tripod and the center bolt 'stop'. To do this you will need to unthread the center bolt from tripod head, add the washer and screw it back into the tripod head.

Patrick


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Patrick
Postmaster
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Reged: 05/16/03

Loc: Franklin, Ohio
Re: Need help with Celestron AVX! new [Re: Patrick]
      #6325797 - 01/21/14 09:51 AM

PSS...I have the AVX and have no issues with the mount head moving with the center bolt installed.

BTW, if I'm not mistaken (going from memory here), but I think there IS a washer that Celestron provides that fits on the end of the center bolt where it clamps to the tripod head. If you didn't get that washer or you simple didn't install it, it could lead to the problem you're seeing.

I can check my mount tonight to see if there is a washer there. Maybe someone else knows?

Patrick

Edited by Patrick (01/21/14 09:51 AM)


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MikeML
professor emeritus
*****

Reged: 10/09/04

Loc: NJ
Re: Need help with Celestron AVX! new [Re: Patrick]
      #6325798 - 01/21/14 09:51 AM Attachment (6 downloads)

What schluterdude recommended, try to add a washer or two to the tension screw.

Edited by MikeML (01/21/14 09:51 AM)


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Patrick
Postmaster
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Reged: 05/16/03

Loc: Franklin, Ohio
Re: Need help with Celestron AVX! new [Re: MikeML]
      #6325806 - 01/21/14 09:53 AM

Mike,

You nailed it! That's the washer I'm talking about. I think the AVX ships with a washer there.

Patrick


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schluterdude
super member


Reged: 08/05/13

Loc: Centerville, OH
Re: Need help with Celestron AVX! new [Re: Patrick]
      #6325814 - 01/21/14 09:57 AM

If that washer isn't there, that'd be the problem!

Does that shaft wobble when you rock your head?


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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: schluterdude]
      #6325873 - 01/21/14 10:38 AM Attachment (6 downloads)

Nope. The shaft is pretty solid. The only movement I'm getting is what I showed in the video.

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MikeML
professor emeritus
*****

Reged: 10/09/04

Loc: NJ
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6325910 - 01/21/14 11:05 AM

Try adding an additional washer or two anyway.

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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: MikeML]
      #6325988 - 01/21/14 11:57 AM

I'll do that when I get home for sure.

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Mr Greybush
scholastic sledgehammer
*****

Reged: 05/16/13

Loc: Virginia
Re: Need help with Celestron AVX! new [Re: MikeML]
      #6325994 - 01/21/14 12:01 PM

adding a second washer might not work and may lead to worse condition. Why? less threads used to secure the mount itself. I suggest starting with a clean slate taking things apart including the alignment peg and start fresh. Sometimes this works I went nuts for 2 days with the same thing with my CGEM and found that the alignment peg wasn't tight enough. Not saying that this is the case I'm only saying that starting over sometimes cure's all. Then if you still have the problem send the mount back and get a replacement. Though not common it is a chance of a bad casting. I only know of one since the mount was made public last year.

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Patrick
Postmaster
*****

Reged: 05/16/03

Loc: Franklin, Ohio
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6325996 - 01/21/14 12:02 PM

I'll take a look at my AVX when I get home too, to see if there are any other potential issues.

Patrick


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jimbo728
sage


Reged: 11/05/13

Loc: Central NH
Re: Need help with Celestron AVX! new [Re: Patrick]
      #6326060 - 01/21/14 12:34 PM

The washer looks like about 1/8" thick on mine. Agree that if it`s not there, that`s the cause of no lockdown.
Let us know what you find.
Jim


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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: jimbo728]
      #6326107 - 01/21/14 12:49 PM

It's about 1.2mm thick if I recall correctly

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MikeML
professor emeritus
*****

Reged: 10/09/04

Loc: NJ
Re: Need help with Celestron AVX! new [Re: Mr Greybush]
      #6326182 - 01/21/14 01:25 PM

I seriously doubt that adding another washer will cause him to strip out the threads, but you should always use caution.

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MikeML
professor emeritus
*****

Reged: 10/09/04

Loc: NJ
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6326210 - 01/21/14 01:41 PM

Quote:

It's about 1.2mm thick if I recall correctly




Mine measures 2mm. The portion that screws into the mount head is 50mm from the tip of the threaded section to the shoulder. The threaded section is about 12mm long as is the amount it screws into the mount head.


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jimbo728
sage


Reged: 11/05/13

Loc: Central NH
Re: Need help with Celestron AVX! new [Re: MikeML]
      #6326271 - 01/21/14 02:09 PM

The washer looks like a brass washer.
Jim


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Xeroid
super member
*****

Reged: 09/21/13

Loc: USA
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6326388 - 01/21/14 03:07 PM

Maybe there is a 'gap' between the head and tripod?

Can you add one or two thick washers between the head tightening knob and tripod underside?


Tom


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