On Fri, Sep 07, 2007 at 11:10:13AM -0400, Gene Heskett wrote: > Greetings all; > > Is there documented someplace where I can grab a copy and print it, a method > to calculate the major and minor diameters of a thread that is specified only > as 16 tpi, pitch diameter 0.965"?
If the pitch is .0625, the height of the triangular thread (sharp minor to sharp major diameters) is .0625 * sqrt(3)/2 = .054. The pitch diameter is halfway between the sharp minor and sharp major diameters, so minor is .965 - .054/2 and major is .965 + .054/2 This gives .938 and .992 as the sharp diameters. > I got out my calculator and came up with a figure of 0.926" for the minor, > but > when I quit boring at 0.917 last night and switched to the single tooth > threading bar I'd made, the nut fit the threads while they were well under > 50% cut! Very sloppily too. > > So when I turned it around to do the other end, I measured the nuts exterior > threads and came up with about 0.878" so I bored that end to about 0.865" and > started threading. This end fit better, but wasn't even close to having > sharp inner peaks yet because the starting diameter was still too big, > leaving a very noticeable flat. These numbers don't work out to match mine... Something funny is going on. Chris ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
