Celestron Focus motor - Forums

A.D.Ben

Topic starter

Mar 6, 2021

I had problems getting the focus motor working with my 9.35 Edge HD. It was binding. I fixed that. Then calibration would only run 0 to 40,000. according to the various videos that I watched it should go from 0 to 60,000. The Focuser utility also shows 60,000. After countless try I wrote Celestron and they wrote back telling me that on SCTs 0 to 40,000 was normal. So all is good. Hope this help someone.
Clear skies. Ben.

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Alan Brunelle

Mar 6, 2021

I just got the motor working on my RASA 11 and posted about that a week ago. A year ago, I had a similar experience and abandoned my attempt. What I did to be sure I was getting to the extreme In and Out positions was to first do the calibration, then using the utility taking the focuser all the way In. Dismounting the motor and manually confirming that it indeed got all the way in. Then I repeated for all the way Out and confirming. At that point, you then have to trust then numbers your calibration gave you. Unless there is something wrong with the focus mechanism on the telescope. Also, all the way In or Out is unnecessary as long as the motor is freely moving within the rather small range that will ever be used to focus.

Glad to hear that you got things working.

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Blue

Mar 7, 2021

As far as I know, the 0-60,000 count is the limitation of the focus motor, the actual position limits depend on your scope. If you hear a hard stop during the calibration routine (Rather than loading up and slowing to a stop) and the count is only 40-45,000, that just indicates the mechanical travel limit of your scopes focuser. The point of the calibration routine is to find the end stops of your scopes focuser so that the software prevents trying to drive past them.

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A.D.Ben

Topic starter

Mar 8, 2021

Thanks for the replies it is working now. Just waiting for clear skies now.
Clear skies. Ben.