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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
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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
Pooh-Bah


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
Pooh-Bah


Reged: 11/05/13

Loc: The North 40
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
Pooh-Bah


Reged: 11/05/13

Loc: The North 40
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
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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
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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
Pooh-Bah


Reged: 11/05/13

Loc: The North 40
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
member


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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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
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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
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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
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Reged: 05/16/03

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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
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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
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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 (7 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
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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
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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
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Reged: 05/16/03

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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
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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
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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
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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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dragonslayer1
Pooh-Bah


Reged: 02/25/12

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Re: Need help with Celestron AVX! new [Re: Xeroid]
      #6326458 - 01/21/14 03:52 PM

If you just purchased it and it was new, rather than start jerry rigging it, call whoever you got it from and see what they say, just an idea, Kasey

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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: Xeroid]
      #6326761 - 01/21/14 06:45 PM

I just went home and checked, there is already a washer on there.

Oh and I tightened down the peg as hard as I could and it didn't do anything.

Here are the pics I took deviantart

Edited by JPDucky (01/21/14 06:49 PM)


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MikeML
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Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6326805 - 01/21/14 07:09 PM

Quote:

I just went home and checked, there is already a washer on there.






Add another


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schluterdude
super member


Reged: 08/05/13

Loc: Centerville, OH
Re: Need help with Celestron AVX! new [Re: MikeML]
      #6326939 - 01/21/14 08:12 PM

Is the jam nut on the alignment peg? Is it tight against the baseplate side? Don't thread the peg AND nut together into the mount all the way, and use the nut to tighten.

Thread the nut all the way up the peg, thread both down into the mount leaving a thread or two exposed UNDER the nut. Then, thread the nut down, hold the peg, and tighten the snot out of the jam nut.


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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: schluterdude]
      #6327260 - 01/21/14 10:36 PM

They are both as tight as they will ever be on there.

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dragonslayer1
Pooh-Bah


Reged: 02/25/12

Loc: SLC, UT
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6327677 - 01/22/14 06:31 AM

Look at the peg and the wear spot, it appears to be as tho sliding off the face of it by the pictures, Kasey

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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: dragonslayer1]
      #6328022 - 01/22/14 10:39 AM

Keep in mind the peg is on the opposite side that I use it on in the pictures, so the wear is not relative to its current position.

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rmollise
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Reged: 07/06/07

Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6328101 - 01/22/14 11:14 AM

If everything is tight and put together properly, something is wrong with the mount. The first VX I received had an improperly threaded bolt hole for the central bolt, the tripod bolt. Carefully threaded the bolt in and...it was locked in place so tightly it took a pipe wrench to get the mount head off the tripod. I also noted that the hole for the toe-saver on the counterweight shaft was improperly threaded; the toe-saver would not thread on all the way. The replacement mount was perfect.

Anyhoo...the two easiest things for you to do? Return the mount for a replacement, or fabricate some kind of big washer to place between mount and tripod head.

Edited by rmollise (01/22/14 11:15 AM)


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Patrick
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Re: Need help with Celestron AVX! new [Re: dragonslayer1]
      #6328438 - 01/22/14 01:44 PM

Based on the wear spots on the casting I wonder if the mount head is actually seating properly.

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JPDucky
member


Reged: 11/28/13

Loc: Jackson, MS
Re: Need help with Celestron AVX! new [Re: Patrick]
      #6329527 - 01/22/14 10:38 PM

I can't believe it, but I found another washer that fit and slapped it on there. Its tight now!

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rdandrea
Carpal Tunnel
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Reged: 06/13/10

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Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6329551 - 01/22/14 10:48 PM



Good job.


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MikeML
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Reged: 10/09/04

Loc: NJ
Re: Need help with Celestron AVX! new [Re: JPDucky]
      #6329944 - 01/23/14 06:46 AM



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schluterdude
super member


Reged: 08/05/13

Loc: Centerville, OH
Re: Need help with Celestron AVX! new [Re: MikeML]
      #6330060 - 01/23/14 08:22 AM

Sweet!

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