Declination setting circle calibration problem
Posted 20 April 2009 - 07:35 PM
I just bought a used Orion Skyview Pro EQ Mount. After I calibrate the declination setting circle and tighten both set screws, the circle will move as I move the mount in the declination axis. Has anybody experienced this problem and/or has a possible solution? The RA setting circle works perfectly - I don't even have to tighten the set screws.
Thanks in advance and clear skies!
Posted 20 April 2009 - 09:18 PM
If the former, does it seem like the circle is being pinched in its groove? There should be some amount of "slop" where you can move it up and down freely 1mm or so when the set screws are not tight.
Posted 21 April 2009 - 09:04 AM
Thanks for the response. Yes, the circle moves in relation to the saddle when I release the Dec lock and move it by hand. If I use the slow motion knobs (locked or not), the circle stays put. As far as play in the groove, there is about 1mm of play on one side of the groove (by the worm gear) but there is no play at all on the other side where I lock it down. I guess the quick fix is just use the slow motion knobs for all movements. Please let me know if you have any ideas for a permanent fix so I can move the Dec axis by hand and maintain calibration.
Thanks again and clear skies!
Posted 21 April 2009 - 09:33 AM
As the pictures show the ring setscrews push into a part of the mount that moves with the saddle when the Dec is unlocked. So it's hard to understand how the ring would not move with the saddle, unless it's being dragged upon by the lower part of the mount due to pinching.