Need some help. Newbie about to do some cleaning
Posted 14 March 2018 - 12:26 AM
Posted 14 March 2018 - 01:15 AM
On my Vixen A80MF (also Synta-made) most of the grease was located inside the focuser box and the lid could be removed by removing the 4 small screws on the focuser. Removing the lid will exposing the rack-and-pinion mechanism and allow you to remove most of the grease with some Q-tips. I would start with that, as removing the focuser completely from the tube may slightly affect collimation and cause the paint on the tube to chip if you are not very careful.
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Posted 14 March 2018 - 01:33 AM
Leave focuser assembly casting attached to the main tube. Unscrew 4 screws holding shaft cover, throw everything in a margarine container, including shaft. Don't worry about the focuser tube, it should slide right out. Collimation will not be affected. The rack is held by two small screws, remove rack and put in margarine container. Degrease all these parts. Grease from the focuser body (where the shaft used to sit) comes off with Q-tips.
Reassembly is in reverse. I use Corning high vacuum grease, but other greases will be fine. Only a small amount is needed on the pinion, in the grooves where the shaft sits, and on the spring thingy where it pushes agains the shaft. Don't put grease on the focuser tube itself. One adjusment is the 4 screws holding the cover plate. Start by having them NOT completely screwed, and adjust for best action. The other adjustment are almost hidden set screws on top (two sets) that adjust the plastic bearing surfaces, look a the pictures on this page:
It's hard to screw up, unless you lose parts...
If I remember properly, Jon Isaacs once wrote a tutorial for this kind of focuser, maybe he'll pipe in this conversation...
Edited by ChristianG, 14 March 2018 - 01:38 AM.
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Posted 14 March 2018 - 01:37 AM
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