Re: Crayford construction
Richard Schiek (richard@chemeng.Stanford.edu)
Mon, 1 May 1995 10:22:26 -0700
Mitch asked:
| In the JMI focusers in which ball bearings are used for the
| focusing rod, how is the tension provided to prevent the
| draw tube and eyepiece from slipping? The drawings I saw
| had simple metal bearings which pressed against the rod with
| a spring to provide this force. Thanks.
|