On 8/15/2013 1:21 AM, PrecisionmachinisT wrote:
In either caser, Sfm (rpm) is dependent mostly on material and tool
diameter; (or workpiece diameter if turning)....

--tapping is typically done at slower than the optimum rate mostly because
of machine/ operator/ cnc controller restraints.

That said, drilling at a moderately reduced rate typically causes no
objectionable results other than perhaps a slightly higher per-hole
cost...(oftentimes this balances out into the positive since this all
involves having to actually calculate cutting tool cost proper, labor cost
to replace said tool, downtime, and so forth)

As they shout in Catholic churches... BINGO!

If the customer isn't in a rush, the slower tapping RPM can usually be
used for the drilling process with no negative side effects.



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