Hi Ken,
For a normal cold forming knurl, what I have found works pretty well, is to start with just about 1/4 of the width of the knurl engaged on the part. Feed in quite suddenly to full depth, because the pitch changes according to the depth, so you might as well get it over with right at the start.
Another trick I use is to angle the knurls a couple of degrees from perpendicular to the surface. This make the leading edge of the wheels "dig in" for a more positive bite.
It is difficult to know what full depth is, but on a manual lathe, I just go by feel. Then, back off a bit and begin the traverse feed, and the wheels will continue to track well in the heavy pressure area where you began.
I usually knurl to full depth in one pass.
Cutting knurls are different because you start clear of the end and feed in. I believe that the pitch diameter can be calculated and the depth set according to the pitch of the knurl.
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |