I'm looking for some advice here. I'm trying to make some 1" long BeCu pins that are 1/32" OD, with a 1/4" long x 1mm OD section near the middle... basically your typical screw machine part. The problem I'm having is the part is coming out with a slight bow to it, typically about 2-3 thou of TIR, which is unacceptable (the target is under 1 thou). I'm using a sharp cutting tool (no radius). I've double checked the tool centerline, and tried varying the cut & feed speeds. I've tried material from a couple different suppliers.
Anybody tackled a job like this and made it? Thanks!