[SCzEngrgGroup]

I cut this last night, using the 3 flute 1/8" viper endmill, 14000 rpm, 25-30 ipm .03" DOC.

I guessed at the rpm and feedrate based on test cuts and adjusted rpm for a nice sound. Used a water based lube/coolant from think&tinker in spritzes.

would be Interested on the math here to compare with destiny tools specs. Maybe put the thread back on track, or have 4 of you come up with different numbers and argue about it

Unless you're running on a very lightweight mill, you should be able to do roughing at a MUCH deeper DOC. I do most of my roughing with 1/8" tooling at a 0.100" DOC, and comparable RPM-adjusted feedrates (8200 RPM, 18 IPM), with HSS tooling.

Regards,
Ray L.

[Spinnetti]

I do most of my roughing with 1/8" tooling at a 0.100" DOC, and comparable RPM-adjusted feedrates (8200 RPM, 18 IPM), with HSS tooling.

Regards,
Ray L.

Ray, I managed to break 3 endmills this week using 2 flute solid micrograin carbide at 5100rpm and 3 ipm at 3/16 doc... just too much doc? Didn't really seem to matter how slow I went.

[BobWarfield]

Ray, I managed to break 3 endmills this week using 2 flute solid micrograin carbide at 5100rpm and 3 ipm at 3/16 doc... just too much doc? Didn't really seem to matter how slow I went.

What was your width of cut (stepover)?

BW