Originally Posted by NC Cams  Am I wrong in assuming that the optimum RPM when you start to feed in the tool to cut will ultimately depned on:
A. the diameter of the part being cut
and
B. the optimum surface footage that the material wants to be cut at??
When/if you run out of rpm potential for the spindle, at that point the surface finish will start to suffer. |
not necesarly true when threading ... it is faster to run threads at high speeds with a good amount for a depth of cut or number of cuts compared to what the stanards/formuals call out. The SFM dosent matter as much as it would if you were turing/boring the OD/ID since you are not worrying about chip break or burning the tool/material cause you are not taking off that much at a time. You'll break/chip the insert before you burn it up if your depths are not right.