Re: Need Help with Gemini 1 Movements
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Happy Thanksgiving, all.
Thanks, David, for explaining that the Gemini system only measures changes in motor position, that it does not know its exact position.? ?
I am wondering if Bob has some contamination or fogging of the optical encoder in his motor assembly.?? Bob....if you switch RA and DEC motors, does the problem move from RA to DEC?? If so points to the motor assembly...not the Gemini.? ?
I have found at least one case in the past where an optical encoder's clear plastic disk (with black opaque lines printed on them) did fog up over time... if so the Gemini will get wrong values transmitted and calculations will be all wrong, and inconsistent.
Hope you resolve the trouble soon.
Michael
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The G1 and G2 have no idea whether the mount is at the CWD position or where it is actually pointing at any time, as there are no sensors in the mount to tell them that. The encoders on the motors only provide data on how much the motor has turned, and therefore where the mount is supposed to be pointing based on an initial assumption of where the mount was when the controller was powered on.
Dave
From: Losmandy_users@... [mailto:Losmandy_users@yahoogroups.com]
Sent: 23 November 2017 13:28
To: Losmandy_users@...
Subject: Re: [Losmandy_users] Need Help with Gemini 1 Movements
Thanks Paul, Michael,and Don for the comments and suggestions. Here are a few responses:
1. I'm using only the HC, no PC.
2. Right! EST - 5 hrs
3. This problem started with my original ver 1.01. When I inserted then 1.05 EPROM with great expectations, the problem remained.
4. When doing the original alignment, the movement of the RA axis is only about 5deg from CWD position. When I see it stop so soon, I know it's going to be a disaster.
5. I've tried moving the mount all the way to the alignment Bright Star and the hitting Align, and then doing a GoTo, but no luck. I get either a meaningless GoTo movement, or a message saying that the object is below the horizon. The mount has no idea where it is.
6. I haven't tried the Park suggestion yet. I'll try that when I get home on Sunday.
There seems to be 2 problems going on at once. First, it doesn't seem to pay attention to the Home CWD inputs, so it doesn't know where it is or where to go, and second, it shuts down the RA movement after about two seconds. On top of that, I'm not getting all the Bright Stars, but that could be related to problem one.
More suggestions and thought are welcomed!
Thanks, and Happy Thanksgiving!
Bob
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Michael Herman