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Re: Large Dec Backlash


 

Hey Ryan, Ryan here.
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I've been where you are.
I wrote this post to explain my approach to the spring loaded worm adjustment:
SLW Worm Block Adjustment

See if that helps.

Start with the DEC axis as that as where the majority of the backlash matters. Once you get that down you can adjust the RA axis, but you may not need to.... the RA is constantly moving in one direction... backlash is more of an issue when the axis reverses direction, like the DEC does.

There are also some videos on the Losmandy You Tube Channel that are handy.
Here is a from Losmandy.

There is a learning curve but it is worth it and part of the typical user maintenance.

Some advice:
Recommend adjusting the worm without counterweights and without a scope, like in the video. It is worth taking everything off the mount. If there is an imbalance, and you release the spring tension too much on the worm gear, the scope can swing around chattering your worm gear on the top of the ring gear teeth and your soul will die just a little bit with every heartwrenching click.

If you adjust the bare mount there is very little moment arm to turn the DEC axis unintentionally. Likewise notice in the video that the DEC axis is removed to adjust the RA axis... the DEC axis is pretty top heavy and can swing around with the same heart-stabbing chatter.?

Once you follow the directions, you should see an improvement. Each time I notice the backlash creeping up I do the adjustment. It depends on temperature, amount of use, and how much I move the mount around. Took me a couple of tries before I understood what I was doing.
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Anyways, hope that helps. Let us know how it goes.
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Cheers and clear skies,
Ryan

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