Discussion
High carbon steels are machined using tools having:
Answer: A
The key's answer is a negative rake angle.
The harder and stronger the work material, the smaller the rake angle should be, because a small rake leaves more metal behind the cutting edge. With a negative rake the cutting force pushes the edge into compression instead of bending it, which suits hard, high carbon steel and the brittle carbide tool tips used to machine it.
A large positive rake is for soft, ductile metals such as aluminium and copper. Zero rake is typical for brass. The key takes the carbide-tool case; with a high speed steel tool, a small positive rake is the usual choice for high carbon steel, which is why that option is a near miss.
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