After the successful installation of a new set of RA and DEC wormgear in Eric Ayres' LX-200, I decided to investigate the bad DEC backlash or retrograde motion, I could not get rid of on my 10" LX-200, I suspected it was in fact lag, due to a mis-aligned worm drive.

Intending to follow the process from the recent install and also information from Doc G, I took the cover off my DEC drive and replacing the locking knob, started to look at clearance and position of worm drive. Everything looked pretty good, so I grabbed the handle on the back of the OTA to see if there was any movement. I pushed down and was surprised to see the whole worm drive assembly move. I looked closer and pushed again, the two hex headed screws appeared loose.
I tried tightening the screews, with no change, so I removed the screws, added a lock-nut and tightened them down again.
I then tested by pushing the OTA again, no movement.

I powered up the scope and lined up a star in my eyepiece, used the keypad in guide mode to move North and then South, It was fixed ! no retrograde motion.

Cheers !!
--
Ivor Barker
10" LX 200
ST-237
37 08 24 N
121 36 25 W
http://groups.yahoo.com/group/ST-237
http://www.employees.org/~ibarker/Astronomy
Please take a look at my Messier Project (updated daily - almost)
http://www.employees.org/~ibarker/Astronomy/Messier.html

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