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F&S for 3/32 drill in 304 stainless to avoid work hardening?

gmoushon

Cast Iron
Joined
May 18, 2006
Location
Illinois
I need to drill a series of 3/32 holes in 304 stainless to a depth of 1 inch. I'm using solid carbide bits and flood cooling. First attempt I ran at 6040 rpm, plunge @ 8in/min, and pecked 0.060. (Full retract.) Bit broke about 1/2 way in.

I'm assuming I need to slow the spindle down quite a bit. What would be a safe starting feed and speed to avoid work hardening? Also, what peck depth would you recommend?

Thanks.
gm
 
Skip the carbide unless you have thru-spindle coolant. Spot with 140° carbide spot drill (Lakeshore Carbide). YG1 TiN Cobalt 130°Point Parabolic Flute Drill. 1500 RPM, 2.0 IPM, peck @ 0.060" like you're doing.
 








 
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