A reamer becomes dull when it is backed off or turned in a direction opposite to the cutting action.

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Prepare for the Machinist Apprentice Level One Test. Utilize flashcards and multiple choice questions, complete with hints and explanations, to ensure readiness for your exam!

Multiple Choice

A reamer becomes dull when it is backed off or turned in a direction opposite to the cutting action.

Explanation:
Dullness comes from wear on the cutting edges as the tool shears and heats the workpiece during actual cutting. If you back off and stop cutting, there’s no cutting action to wear the edge, so the edge isn’t being dulled by that action. Reversing direction isn’t how a reamer is meant to cut, and while it can cause rubbing and heat (which can cause other problems), it isn’t the normal cause of the edge losing sharpness during proper use. In other words, dullness is tied to cutting action in the forward direction and the associated wear, not to backing off or reversing the feed.

Dullness comes from wear on the cutting edges as the tool shears and heats the workpiece during actual cutting. If you back off and stop cutting, there’s no cutting action to wear the edge, so the edge isn’t being dulled by that action. Reversing direction isn’t how a reamer is meant to cut, and while it can cause rubbing and heat (which can cause other problems), it isn’t the normal cause of the edge losing sharpness during proper use. In other words, dullness is tied to cutting action in the forward direction and the associated wear, not to backing off or reversing the feed.

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