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I experimented with some success with rigid aluminium couplers on an original OPW design. I bored both ends and precision fitted for my DEC paying particular attention to concentricity and tolerances.

I think if you can get to the bottom of your puzzle it will help others know what issue to look for. *** Seriously?? Even an idiot like me knows the answer to this.. And even your text based drawing

Thanks for the feedback and advice. I'm in no hurry - perk of being an astronomy professor is that I just get to have three setups for class instead of two until it sells. Shipping for both (this is

Seems good to me.. Either be patient (and edit the ad to keep it near the top), or drop the price to a "priced to move now" price, would be my suggestion.. .ie it depends on how fast you "need" to

Peter, Glad you were able to make a solid connection between motor and worm. McMaster is a super supplier and you can find a whole lot of specialty bearings connectors, gears, etc. I have used them

I set the step size smaller, but it uses 500ms anyway. For TVC, I used 10, which is what I derived from the G8 axis.? I didn't change it when I upgraded to the G11, but from the backlash test, at

What I meant was that our methods determined a TVC value for the gear backlash only.? This part is generally fixed and doesn't depend of sky location, gravity, temperature, etc.? I don't have an

Allen, I have to quibble with you here. TVC does not just remove the gear backlash (I assume you mean gearbox), it removes all the backlash including the worm "mesh" backlash. Did I understand

regular parlance. yes, that sounds about right :) [email protected]> wrote: -- Brian Brian Valente portfolio brianvalentephotography.com <http://brianvalentephotography.com>

John, The whole reason why I am testing with a rigid coupler is to ensure that the worm and motor shaft are axially aligned as much as possible. But, as you say, there is a potential problem here. If

You only have up to TVC value of 255 you can set. You may just run out of integers ;)

Thanks guys! I suppose I could have looked this up but I was lazy. ?This makes a lot of sense and 8x guiding rate for the adjustment is not quite instantaneous, but probably good enough. I hope folks

Paul, Thank you for confirming the TVC speed (8x). I could not find it anywhere except an old post which stated 20x which did not match my measurements. Eric

Both our methods (laser or allen wrench)? use TVC to remove all the gear backlash BEFORE it gets to the worm.? There is additional backlash between the worm and ring gear (including ring gear

Exactly. TVC value is the number of encoder steps to take at 8x the guiding speed. The smaller the encoder step, the larger the TVC value required to compensate for the same amount of backlash.

Peter, According to the Gemini serial commands, the TVC value is measured in encoder steps, programmable from 0 to 255. If your step size is 5 times smaller, your TVC value will be 5 times larger for

Hello all After getting my new G811G last month, I had some trouble with the random slews and trying to configure PHD2 to get better results with guiding, but things are working pretty well now. This

I'm in the market for a second mount. I posted an add yesterday in Astromart. But I"m really only wanting the head, no tripod, controller, etc. Please feel free to PM me.

Brian, Tomorrow is a clear night and I'll run some PHD2 backlash tests to confirm my bench results one way or the other. The value of 100 I determined to cancel out the backlash seems to be at odds

I had an issue that I traced down and fixed with PHD2 / Indi where phd's "stop guiding while slewing" didn't completely work. I believe that there may have been some guide commands in the buffers