Quote:
Originally Posted by Mark Yacavone
Makes sense. Might be then. Once you get the drill bit started, it'll go.
I'm sure the pedal arm is hardened for safety reasons.
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Quote:
Originally Posted by Alan Nyhus
Case hardening only hardens the surface. The material under the hardened surface remains unaltered.  -Al |
Machining through a 60Rc surface can be done, but not easily at all.
Speeds and Feeds
SFM IPM DOC (Inch Depth of Cut)
Carbon And Alloy
Steels (50-60 Rc) 300-500 0.002-0.008 0.003-0.020
Die Steels (55-65 Rc) 150-350 0.002-0.008 0.003-0.008