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Hermit
member
Reged: 10/26/08
Posts: 48
Loc: Northern California
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Re: New LX90(s) - declination vibration
08/16/09 02:13 AM
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I bought my 8" LX90 back in October last year, and wrestled with the vibration thing. I decided to go through the scope myself rather than suffer the return cycle(s) that others had described. Bottom line is that I found no one problem to account for the bumping . . . the drive system just seems slightly too weak for the task, and would intermittently stop, then lurch forward at times.
So I did a few things to increase its power and decrease the load. I hooked up each motor to a single AA cell overnight off the scope to break in the motors. I ran the worms on the ring gears for hours to wear in the gears a bit, then cleaned and applied high quality grease, and ran them some more, and re-cleaned. I adjusted the worm play and spring tension to optimal. I found that the ring gears are slightly out of round, and figured a way to mark the high spot and tension the clutches with that spot over the worm to even out the roundness. And I religeously balance the scope.
This kind of stuff is not for everyone, but is quality entertainment for me on a cloudy night. I'm trying my hand with astrophotography on a wedge now, and so far things are going smoothly for an inexpensive fork scope. Err . . . were going smoothly until I dropped the controller last night . . . ouch.
Best,
Rob Crockett
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Meade LX90 LNT 8" Schmidt-Cassegrain
Standard Wedge, LX90 fork, LX200 tripod
Alan Gee II telecompressor f/5.6
Baader short 1.5cm T-adapter/T-ring
Astronomik CLS-CCD clip filter
Self modified Canon XSi with Baader UV/IR filter.
Meade Model 277 60mm refractor with Orion SSAG
Losmandy V-dovetails for balance and guide scope.
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