Discussion
For tapping cast iron using a machine tap, the rake angle of the tap is:
Answer: A
The rake angle for tapping cast iron is about 3 degrees.
Cast iron is brittle and breaks into short, powdery chips, so it needs little rake: a small rake angle, around 0 to 3 degrees, keeps the cutting edges strong and stops them digging in and chipping.
Larger rake angles are for ductile materials that form long chips: about 8 to 12 degrees for steels, and up to about 20 degrees for soft metals such as aluminium. Using them on cast iron would weaken the cutting edges for no gain.
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