I have an Orion TrueTrack Dual Axis Drive upgrade to an Orion SVP. I was into AP about 10 years ago and have revisited my equipment to do some Astro Photography, a "reboot" if you will.
My setup is:
Williams Optics ZenrithStar 80 mm Doublet 545 FL
Orion StarShoot DSI II CCD
Orion Observer 60mm 700mm FL
Meade DSI I CCD
Orion SkyviewPro EQ
Guiding: PHD2 7.6.2 (Linux)
Imaging: Nebulosity (Windows)
- My issue is with the axis drives: There is a "play" in the drives' shafts (same on both axis') of only about 1-2 mm, but for the accuracy i need that could be 1-2 miles.
- In my procedure of auto guiding and imaging this "play is facilitating itself with almost impossible calibration. The steps west goes ok according to "seeing" then East goes one or two steps. Clearing DEC backlash starts and the star shoots off the FOV of my guide camera. I have performed the Polar Drift Alignment procedure and have been able to get good results and i am somewhat assured i have good polar alignment. I have read that this might actually hurt my situation then help it, that seems counterintuitive
- I have dissembled my SVP totally cleaned everything and re-lubricated all gears and axis according to astronomy boy's CG-5 article (oldie but goodie :http://www.astronomyboy.com/cg5/).
- Technically i have not tried to calibrate the mount after my improvement on the mount. But with the drives' shafts turning right and left so much i do not really expect much difference.
Has anyone on this forum experienced the with axis drive motors? This could be universal to dive motors but the Orion are definitely not the best axis motors on the market
- I know there should be some play to protect the internal Spur gears but it seems excessive.
- I have taken the drives apart and there does not seem to be any adjustment points that i could "tighten" the play out of the motors on that level.
Thank you for any direction i could go with this. In the back of my mind i think i know the answer (buy a new mount) but i think i have boiled my problem down to the drives.
Rebooted AP user