NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Bill Morris
Date: 2011 Mar 27, 18:49 -0700
This is an interesting application of the differential screw principle, sometimes used in machine tools like surface grinders to make fine adjustments. It has also been used in a micrometer head, though not as far as I know as a commercial proposition.
There are "quick and dirty" ways of tightening a nut around a screw. The nut can be split longitudinally and closed up a little in a vice, or it can be split tranversely across the full diameter of the thread while leaving part of the wall intact and closed up a little in a vice. A more refined way of closing this latter is to drill and tap for a small diameter screw.
Bill Morris
Pukenui
New Zealand
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