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Dear JMD and Tom, The Belleville washers you want for G11 and GM8 drives are called "R4" on the McMaster website. I charge $1 each for those. Those will also fit the DEC axis on a G11T. I think you

Awesome work! Can't wait to see what it produces when the sky's clear!

Michael, I assume that wrapping on the OTA is for insulation to minimize expansion and dewing? Tom

Do you have a part number for the Bellville washers? Thanks, JMD

This is a nice forum (especially for us insomniacs) to discuss improvement and diagnostic ideas. I'm sure all the other owners are busy using their mounts to get great images. That's the "silent

Hi Alan, I do have a group of old and brand new stock gearboxes, and a set of McLennan 25:1 and 50:1 gearboxes too. The pinion gears are tiny, and must go on a motor shaft exactly positioned into the

Thanks for the comments, Michael. I expect the G11 axis to have half the error and half the time lag because the motor / gearbox / worm have to spin twice as fast. I think an over-tight worm mesh

Yes, I know what you mean in terms of the DEC N or S bias.? My scope setup is fairly symmetrical except that the cables go on one side.? I did try N vs S balance once by clamping a heavy C clamp to

My opinion is that you need just enough clearance to allow the bearing to tilt inside the block by a tiny bit.? Maybe about 0.001 - 0.002" clearance

El telescopio no tiene marca, es fabricado por mi 300mm f / 4, con anillas parallax y milano losmandy 44cm. Mi otro telescopio es un C11 celestron.

Hello Michael, Thanks for your thoughts. I guess I will just have to try a few polished bearings and see how they slide with decreasing ODs. Once I get one that easily moveable, I should put it the

Nice work John to take Stuart's idea and run with it. I don't know how much OD of the bearing should be undersize of the ID of the block, at room temp. I was only requiring that it slide under the

Very deep writeup, Alan...you innovated a number of things to elucidate the issues. (Good comments by Henk about "stuttering" also but I have a suggestion for that below). Thanks for describing your

David, With many members on this forum, the mount they choose for larger SCTs, like 11" or 14", is the Titan mount. For a Newtonian design, you have a large optical tube with large external

About the asymmetry that you mentioned where the worm is lifted going one way and pulled in going the other way:? I noticed with my system that the weight of the focuser with imager and guide scope

On Sat, Apr 3, 2021 at 11:28 AM, Michael Herman wrote: > > Stuart Hutchins, a very experienced and knowledgeable group member, has > been explaining the details of bearing seals, concerns about

They do seem to rhyme. but I think that it's a different song:) The one set of data that I attached, I had balanced everything pretty well, but this has been going on for days, and I know for sure

Hello folks, I have one of the new GM811 with the "spring-loaded" worms and tucked motors.? In this thread I will mention some of the testing I did and a few things I learned about backlash in this

That was with "DIY spring loaded worms v2" where only the outer block was floating so in the case of radial motion the inner block bearing would become misaligned.? My thinking (for v3) was that by

Oh, ok.? It's because you wrote this earlier: "Also, my outer block bearings should realign themselves because mine float and are pressed by a tangential spring.? So I think the inner block needs