C11 Losmandy Stepper Motor gone bad..... Mar 21, 2012 22:17:52 GMT -6
Post by Chicago Astronomer Joe on Mar 21, 2012 22:17:52 GMT -6
C11 Stepper motor issues on the Celestron/Losmandy mount
Spring is when I like to do deep maintenance on my equipment. No heat in the workshop, so winter is out and summer is chock-full of star parties and astro activities. Last fall, I started to develop some issues with the control pad, in that it would no longer nudge the OTA when pushing buttons. Tracks ok, but not the Dec motion. I had to manually correct or adjust with the slo-mos in the meantime till I figured out what's going on.
Before the Vernal Equinox Chicago Astronomer Star Party, I examined the motor. I could hear it trying to spin, but nothing was happening with the gearing. So I dropped it off the mount...
It spins freely when pushing the button, so I check the gear-box....
It does not kink nor has any resistance when I spin it by hand...feels solid. The teeth on all cogs look sound and the entire integrity of the gear box seems good.
I replace the the motor back in place, push the button..and again - nothin'...
Removing the motor, I push the control pad button and it spins again.....but, when I pinch the shaft gear with my fingers, it slips internally. The additional resistance applied to the gear is too much for this little motor and time to replace it. Perhaps the brushes are shot or whatever...just easier to replace.
I will search for one soon, so in the meantime, It'll continue to be a manual operation till repaired. Might as well replace both motors whilst at it.