I am making a 5c collet holder. I am at the point that I want to thread the holder for the collets. One set of instructions say to bore the hole 1.175 and thread 20 tpi to a pitch diameter of 1.205. Another article says to bore the hole 1.191 and thread 20 tpi till collet spins on freely. This is quite a bit difference between the two. Anybody know which is correct?
17 years ago