Flute Carbide

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Are these RPM and FEED calculations for CNC correct?

I am working on 6061-T6 (Cold drawn I think).

First I am milling with 3" 6-flute carbide:
RPM=(12(755))/(pi(3))=961
FEED=961(0.020)6=115

Then end milling with 0.75" 4-flute carbide
RPM=(12(620))/(pi(0.75))=3157
FEED=3157(0.004)4=50

And then chamfering with 0.5" 2-flute HSS
RPM=(12(165))/(pi(0.5))=1260
FEED=1260(0.003)2=7.5

Do the numbers make sense?

In wood, I do around 18,000 RPM's, and feed at 400 IPM. Pretty typical with a 2 flute .5" diameter end mill, solid carbide tool, .5" deep in hardwood. That varies from wood species very slightly with all the CNC woodworking routers I've ran, (15 years at it now). Metal, stone, plastics, I'm not sure about your numbers. But my metal mill friends cut as deep as the diameter of the tool per pass, they tell me. Must be held well.

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