[Geezer29]

Has anybody had experience using cutters 0.010" and below in steel.
I'm doing a job and breaking a few cuuters. I have a 30000rpm spindle
and using oil mist coolant. Any advice would be welcome.

[m3cliff]

.0005" d.o.c.
4 i.p.m.

I have 50,000 rpms and vary between .0002" doc and .5 ipm to .001" doc and 5 ipm.

[bebob1]

Yes. What kind of cutters are you using? What spindle are you using? What is its runout and did you measure to verify this? What type of steel?

Also list all the parameters you used for the machining.

Carbide all the way. TiAlN coated preferred (yes you can get them that small say from Micro100). AGreed with the 0.0005" DOC. 0.0005" radial stepover. slow feed. Use fancy entry moves if available but plunge entry probably makes no difference.

[Geezer29]

Thanks for replying

The spindle is HSK F63 in a Makino
Tool holders - Big Daishowa Mega - Runout 0.001mm checked
Tool - Garr Tool 11550 220M 0.010"
Steel - Impax Supreme approx 38 HRC

I was feeding at 0.8"/min and 0.0002" DOC, 50% step over and experience alot of burring.
Do you think air blast cooling is better than oil mist, the swarf seems to stick
with oil mist and possibly causes the cutter to break.