feeds and speeds - CNCzone.com-The Largest Machinist Community on the net!

porkchop21 · #1 08-28-2007, 02:02 PM

i have a bridgeport torq cut 30 with a dx32 control
and my ?? is what would optimal feed and speed rates be with a 1 inch carbide cutter on gray pvc my max rpm is 6500

please no metric coversions

also what is the calculation so i can figure it out later for other materials

thanks in advance

porkchop21 · #2 08-30-2007, 09:23 AM

can anyone help me out with this one

ikneb · #3 08-30-2007, 08:52 PM

Aint plastic fun?The formula for feed rate is RPM X IPT X #of teeth.
as far as IPT for pvc with a 1 inch carbide .005-.01.
so at 6500 rpm with a 2 flute the feed would be 65.0-130.0 ipm.
Most tool companys have lists of feeds and speeds, but its mostly in SFPM>
RPM=SFPM X 3.82 / dia.

1/2 inch carbide 4 flute emill finishing in low carbon steel.
300 SFPM .003 IPT
300 X 3.82 /.5 =2292rpm
2292 X .003 X 4 = 27.504 ipm

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