Ignoramus562 wrote:

On 2011-02-21, dan wrote:
Ignoramus17758 wrote in
rec.crafts.metalworking on Sun, 20 Feb 2011 23:28:01 -0600:

1/8" end mill
4 flute
1 IPM feedrate
2,000 RPM

So your chip load (per rev) is 1"/2000rpm = .0005"per rev.
/4(flutes)=0.000125.

I think that is too small of a chip load. Increase your feed, or
decrease your RPM. I would aim for .002 per tooth.

.002load * 4flutes = .008/rev. * 2000rpm = 16ipm

I would also slow down(feed) on inside corners, where extra load is
encountered.

BTW, I once saw what you are making in a catalog some ware. It was to
use in a 1/2" drill to crank the knee up and down.

Seems pretty high for a puny 1/8" end mill.

I now also suspect that the unknown steel bar was not 1018.

i

Remember, too low a chip load = rubbing and dulling = eventual breakage.