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C90 needs some TLC

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#1 ANM

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Posted 07 July 2020 - 04:36 PM

I recently bought a C90 Astro and sometimes it seems like the motor can't keep the C90 following the stars. I would guess that I need to disassemble the mount base, clean and relube the bearing surfaces. Is there a writeup on doing that somewhere? If I take the nut off the polar axle and pull the base apart are gears and springs and wheels going to go bouncing everywhere?



#2 jgraham

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Posted 07 July 2020 - 05:40 PM

Do you have the counterbalance weights for the tube when it is mounted in polar mode? If not, that may be why the tracking is struggling.
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#3 houndsbourgh

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Posted 07 July 2020 - 06:48 PM

I agree. Without the counterweights its quite an uneven load on the drive.


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#4 ANM

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Posted 07 July 2020 - 07:49 PM

Do you have the counterbalance weights for the tube when it is mounted in polar mode? If not, that may be why the tracking is struggling.

 

 

I agree. Without the counterweights its quite an uneven load on the drive.

Yes I do have them and they are on the scope but with my messing around I've shifted the balance — I have to come up with a work-around. I think it will be ok if I can shift the weights rearward by a few inches. I'd still like to be able to pull the base apart and make sure it's all clean and lubed.



#5 ANM

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Posted 08 July 2020 - 10:54 AM

I need to achieve a better balance with the C90, but I think the problem I'm seeing is a bad connection where the power cable plugs into the base. I have a second cable so I'll swap them and try my tests again.



#6 ANM

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Posted 11 July 2020 - 08:30 AM

Yes! The eratic operation of the drive was due to the power cable. I swapped it with one from another telescope and I am not seeing the problem! The balance still needs to be corrected...




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