speed and feed question

[Bob W.]

I have a 3/16" solid carbide end mill and I need to machine a pocket to a depth of .75" in 6061 aluminum. What speed, feed, and depth of cut would you recommend?

 

Thanks,

Bob

[Guest CNC Apps Guy 1]

With a 10k RPM Max machine, 10k RPM @ 30 IPM for a 3 Flute E/M. DOC about 50% of Diameter, WOC, about 30-35% depending on the shape of the pocket. That'll give you a .001" Chip Load. Shoud be OK for that Dia. E/M.

 

That's where I'd start.

 

HTH

[Guest]

James' numbers are a real good starting point

depending on the endmill.

 

I use 3 flute endmills with 45° hi-rake flutes. They like to be pushed. I would start out a little more aggressive than James. DOC 50% of E/M Ø, Step over 55% of E/M Ø, 10K RPM, 60 IPM. That is a is .002 chip load. FLood Coolant is a MUST.

 

[crazy^millman]

I would do it different like .05 depth of cut 10K spindle 150 ipm. I know crazy but compare cycle times and see if there is much of a difference.

 

Could do it like .1 depth of cut 10 k spindle 100 ipm. I when doing pocketing on a vertical like the smaller chips they seem to clean out of pockets better. On a hortzional I would go with a bigger depth of cut.

 

HTH

[Guest CNC Apps Guy 1]

quote:

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...Flood Coolant is a MUST...

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ESPECIALLY in 6061!!!!

[flatwoods]

is it possible to rough the pocket with a larger endmill first ?

[Guest CNC Apps Guy 1]

Anything is possible.