Guest zidder Posted February 13, 2015 Share Posted February 13, 2015 How much play is acceptable in a rack & pinion focuser ? Link to comment Share on other sites More sharing options...
Tweedledee Posted February 13, 2015 Share Posted February 13, 2015 Ideally little or none. A tiny bit of play may be tolerable for visual, but usually there is a knurled screw to tighten it up a bit. Link to comment Share on other sites More sharing options...
Doc Posted February 13, 2015 Share Posted February 13, 2015 On some focusers you can tighten them up if they are too loose, it's normally via some small screws on the underside of the focuser, Tweedledee 1 Link to comment Share on other sites More sharing options...
Tweedledee Posted February 13, 2015 Share Posted February 13, 2015 On some focusers you can tighten them up if they are too loose, it's normally via some small screws on the underside of the focuser, Wish I'd thought of that Mick Link to comment Share on other sites More sharing options...
tuckstar Posted February 13, 2015 Share Posted February 13, 2015 Is yours not a Crayford style? Link to comment Share on other sites More sharing options...
Guest zidder Posted February 13, 2015 Share Posted February 13, 2015 Is yours not a Crayford style? No it is an older Rack & Pinion, my issue is I have bought a Laser collimator that I cant be certain is square because there is play in the rack Link to comment Share on other sites More sharing options...
Doc Posted February 13, 2015 Share Posted February 13, 2015 (edited) This is one of the problems with collimation. You will find your precision is affected by slop in the focuser as well as slop at the focuser eyepiece opening. That is why many people either use a hotech collimator that adjusts for slop or one of those adjustable self centering adapters to take out the slop. Edited February 13, 2015 by Doc Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now