Feed on small tools

[Guyinthedesert]

I'm currently programming a job, it's 15-5 around Rc35. I's got some clearance issues, and I need to rough it out with a 1/16 em, .400 deep. The maccine it will run on tops out at 10K rpm, planning to use Garr 4 fl coated end mills. I'm not sure where to start on feed and depth of cut. I'm thinking .04 deep with a chip load of .0001/tooth, rest mill w/ 20% stepover. Any thoughts?

 

TIA

[Ron Branch @ 5th Axis]

I would look at highspeed methods full depth of cut and maybe 3-5% step over with .0004 to .0012 feed per tooth and ramp up from there.

 

HTH

[Guest CNC Apps Guy 1]

Try (may not be possible at that diameter) to get more flutes. More flutes = more rigidity and you can feed a little faster. Resist the urge to take small DOC's. If you have 1/8 of flute, take it 1/8 DOC. You'll thank us in the morning. HST toolpaths are THEEEEEE way to go, no question. 3-5% Stepover seems like a reasonable starting point.

 

 

[Guyinthedesert]

Thanks for the suggestions. It'll be ready to run next week, I've got it programmed two ways, full depth with 3% step over, and 1/2d depth and 20% step over. My concern with going full depth is I have .011 wall thicknesses I don't want to bend over.