Discussion
1.5 mm displacement of tool point in boring operation will result in change in diameter equal to
Answer: A
The diameter changes by 3 mm.
In boring, the tool point lies on the radius of the hole being cut. Moving the tool point by 1.5 mm changes the radius by 1.5 mm, and the diameter, which is twice the radius, by \(2 \times 1.5 = 3\) mm.
1.5 mm is the trap answer: it forgets that a radial setting acts on both sides of the bore. 0.75 mm halves the movement instead of doubling it. This is why the cross-slide graduations on many lathes are marked to read directly in diameter.
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