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Re: Spikes!

 

Very nice reports, Jamie!

Especially the good news that you are getting things working as you expected.

It's like a car...when it's working you enjoy the ride.? When the check engine light comes on....you have to check each item to see what's?going on.? "Tighten counterweight rod" was not on my checklist.? For sure if that's loose it could rattle.

The East side bias was something I did not need on my older direct drive G11 mounts.? But it helps a lot on the G11T, and I can see now that the design requires it. Only in the case of perfectly round gears and an unintentional imbalance and nearly zero worm friction can you get away without it.? That's too many lucky coincidences.? Murphy has a law that must be obeyed (used to be called Entropy).?

I got my G11T PE to 1.7 arcsec RMS.? I'm able autoguide 500 sec with round stars.? My stars are going out of focus as the night air temp changes and now I need to use the full capability of the motor focuser to temp compensate.? More to learn...? but the tracking us smooth and quiet and autoguiding is working fine.??

Stay well and have fun...but no sleep in the night ahead.

Michael




On Thu, Apr 8, 2021, 10:50 AM Jamie Amendolagine <jamie.amendolagine@...> wrote:
So a couple of things.

  1. So far it seems that east biasing fixed the issue. So since I was not having issues before, maybe the worm has come loose with spring? My current adjustment is also pretty loose, so maybe my worm is just a bit too loose, and if I tighten it up (not to much!) things may go back to normal.?
  2. I just noticed that the counterweight shaft was not tight. I don't know if it has anything to do with the spike, but it can't be good either way. I tightened it up, and we'll see what happens tonight. I'll try first with my best balance, and the counterweight shaft tight. Then with east bias, and finally with an adjustment of the worm making it a bit tighter, but with best balance.?
  3. Profit! :)
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