Brakes help

[Dave Noll]

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.

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