Question 632General Subjects - Assistant Engineer
70% to passThe angle "A" shown on the illustrated lathe tool bit is properly called the _______________. Illustration GS-0164
Aside relief angle
Bside rake angle
Cworking relief angle
Dnose angle
AI Explanation
The correct answer is D) nose angle. The nose angle is the angle formed between the tool bit's cutting edge and a line perpendicular to the workpiece surface. This angle is an important factor in the tool's cutting performance and is a key characteristic of the tool bit geometry. The other answer choices are not correct in this context. The side relief angle, side rake angle, and working relief angle are other geometric angles of the tool bit, but they do not specifically describe the angle labeled "A" in the illustration.
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