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Re: next up: polar alignment tutorial

 

Terry,

There are several places on the mount that I recommend you install Belleville spring washers.??

For the G11 and GM8 worm bearing, there are bearing springs in the size "R4" made specially for the R4 size worm bearing.? For it's dimensions, look on the website .? I tried but did not find any other sized springs suitable.?

For the AZ and EL bolts pretension, I use Belleville springs made for 3/8 inch bolts.? There are several thicknesses (when flattened the max force goes up of course).? I also get the flat stainless steel washers to put above and below the Belleville springs.

The G11T RA has a Titan worm drive.? That worm bearing requires another special Belleville spring.? I have those also.??

Shipping a thick package abroad can be expensive and requires US customs forms that are complex and time consuming to fill out.? However the Belleville springs are very thin and can fit in a letter envelope, and are a few dollars to mail international.? If you need a few of these washers, let me know with a private email.? ?

Very best,
Michael

On Tue, May 25, 2021, 3:38 AM Terry Pullen via <tpullen152=[email protected]> wrote:
I would like to try using the Belleville washers, suggested by Michael, on my G11's Alt / Az PA adjusment knobs, I am in the UK and have located a source [Belleville Springs in Redditch uk].

Can someone please confirm what internal diameter and thickness do I need for these washers? Many thanks

Brian - I use Sharp Cap for PA on my ppermanent pier mounted G11. I had problems when tightening down the ajustment bolts after calibrating PA in that an excellent result would be made 'poor'.
The way I reduced the change in PA result, caused by tightening down these adjustment bolts, was to adjust PA using SC then measure the change in value between loose and tightned bolts which seemed a near consistant value of shift.
I then re-did the PA calibration deliberately overshooting by the measured 'shift' caused by the tigtening of the bolts, this seemed to help.
I am hoping the Belleville Washers will prove a better solution.

Terry [uk]

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