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Rake and Relief Angles

These rake and relief angles are for high speed steel lathe tool bits.

Toolbit angles

 

Material Side Relief Front Relief Side Rake Back Rake
Aluminum 12 8 15 35
Brass 10 8 5 to -4 0
Bronze 10 8 5 to -4 0
Cast iron 10 8 12 5
Copper 12 10 20 16
Machine Steel 10 to 12 8 12 to 18 8 to 15
Tool Steel 10 8 12 8
Stainless Steel 10 8 15 to 20 8