· Get a Cloudy Nights T-Shirt · Submit a Review / Article Click here if you are having trouble logging into the forums Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> Mounts Previous   Index   Next   Threaded   Pages: 1 Duane Frybarger member Reged: 02/12/07 Loc: San Francisco, CA Declination setting circle calibration problem       #3055902 - 04/20/09 08:35 PM Edit   Reply   Quote Quick Reply   Hi, 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! Post Extras:       hudson_yak Carpal Tunnel Reged: 11/15/07 Loc: Hyde Park, NY, USA Re: Declination setting circle calibration problem [Re: Duane Frybarger]       #3056097 - 04/20/09 10:18 PM Edit   Reply   Quote Quick Reply   First of all, do you mean move relative to the saddle when you release the Dec lock and rotate the mount in Dec by hand? Note that it is normal for the Dec circle to move relative to the saddle by turning the Dec Slo-Mo control on this mount (there is quite a variety of ways mounts choose to handle the Dec circle, but that's how this one does it). 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. Mike Post Extras:       Duane Frybarger member Reged: 02/12/07 Loc: San Francisco, CA Re: Declination setting circle calibration problem [Re: hudson_yak]       #3056867 - 04/21/09 10:04 AM Edit   Reply   Quote Quick Reply   Mike, 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! Post Extras:       hudson_yak Carpal Tunnel Reged: 11/15/07 Loc: Hyde Park, NY, USA Re: Declination setting circle calibration problem [Re: Duane Frybarger]       #3056919 - 04/21/09 10:33 AM Edit   Reply   Quote Quick Reply   This web page shows some tear-down pictures for the SVP. When I asked about pinching I meant laterally across the ring, was it being pinched between the saddle part of the mount and the part below. 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. Mike Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 17 registered and 40 anonymous users are browsing this forum. 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