12" LX200 EMC Stiff Focus Knob
Posted 30 August 2013 - 08:03 AM
The 12"'s knob isn't sloppy or grinding, it just feels like it needs alot of effort to turn. I didn't realize it was too much till I tried installing a robofocus. While trying to calibrate the full travel of the focuser in the robofocus, I noticed the clutch was slipping alot.
My mechanical background is telling me that the grease is old and drying up needing to be cleaned and replaced. I don't just want to go ahead and do this without consulting the forums.
BTW, this unit is before they put the focus lock on the mirror.
If anybody has any suggestions I would really appreciate it.
Posted 30 August 2013 - 11:56 AM
Posted 01 September 2013 - 08:21 PM
I've had a Robofocus installed on my 12" LX200 EMC for the past 10 years. I was unaware that there was a clutch included in the Robofocus system ... unless the newer models now have it? When you say "slipping" ... do you mean the geared plastic wheel is moving while the scope's metal focusing knob remains stationary?
Posted 12 September 2013 - 10:54 PM
What is your mirror shift like on your LX200? e.g. by how many Jupiter diameters at say 250x? My friend Jon H's LX90 ACF 8" has just started to develop image shift of 1/2 Jupiter diameter after 3 years of use nearly every clear moon free night. Focusser on it still has zero detectable backlash though.
Posted 19 September 2013 - 06:16 PM
Posted 19 September 2013 - 06:18 PM