Re: Used GM-8 Guiding Help
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I will try a larger east bias, does anyone have a way to quantify this?
***
I
know of two ways.. My way is to balance my roughly 25# load to ¡°balance¡±..
Then I move the weights ¨C with the CW shaft horizontal ¨C about 3/8¡±
down the shaft if it is going to be East of the mount during imaging, or up the
shaft if on the West.. My weights are.. All three and they are bunched together
and are moved as if they were a single unit..
?
Alternatively,
if you have Gemini II (and/or Michael¡¯s power supply), you can use the ¡°Balance¡±
function and you¡¯ll have a repeatable graphical representation..
?
Either
way, bias East ¡°some¡±.. Like a pound or two.. And like the gain or
exposure, once it ¡°works¡± you can always adjust to make it better
to suit your actual unit, but for now you want to make sure your mount is on the
East gear face so the mount is always driving it to the West even in a bit of
breeze..
?
This
could be nothing, but ¡°RA Always in one direction¡±.. Could the
mount think it is in the Southern Hemisphere and is ¡°fighting¡± the
natural rotation of the celestial sphere (or would that be WAAAY obvious)???
?
Derek
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From: [email protected] [mailto:[email protected]] On Behalf Of Nick
Sent: Wednesday, March 03, 2021
3:50 PM
To: [email protected]
Subject: Re: [Losmandy_users_io]
Used GM-8 Guiding Help
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Thank you all,
I was able to update the firmware and reinstall drivers for the asi120mm. I
also ordered a new cable as it seems to be a common problem. Last night I was
able to connect the camera and it seemed to be working better, no split framing
etc. I did play with the gain a little last night but not to 100 so I will give
it a shot. I may just get a 3.0 version in the near future anyways. Many times
I do 1sec exposures during unguided runs for PE evaluation, but you're correct
during guiding runs I try to remember to be at 2+ second exposures. I'll also
remove multistar just to be sure
Michael, you are correct even with the camera playing more nicely now, it's
separate from the mount issues, I still had a lot of jumpiness.
I believe at this point I'm going to take apart the mount again, and try to
more precisely degrease/regrease everything in case something was left behind,
it is a 2001 mount after all. I'll search through the group but also open to
any regreasing tips, tricks, critical things to watch for (lint? Degreasing
overnight?) I've seen Scotts videos on youtube and try to follow those. Another
thing is I will try a larger east bias, does anyone have a way to quantify
this? I saw someone balances neutral then ties a can of tomatoes on the end of
the CW shaft haha, that's definitely more bias than I've been doing, maybe
larger bias is worth a shot (not using cans though, I have enough issues!)
?
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