Which factor most directly leads to undersize holes when drilling?

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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

Which factor most directly leads to undersize holes when drilling?

Explanation:
The size of a drilled hole is set by the drill’s outer cutting edges, especially the margin that forms the hole’s wall. When the margin is worn, the edge that guides and defines the hole’s diameter sits inside the true size. That means the drill removes less material around the circumference than intended, so the hole ends up smaller than the drill’s nominal size. A sharp edge, proper feed, and appropriate speed all help the drill cut to the intended size and avoid issues, whereas a worn margin directly reduces the effective diameter, leading to undersize holes.

The size of a drilled hole is set by the drill’s outer cutting edges, especially the margin that forms the hole’s wall. When the margin is worn, the edge that guides and defines the hole’s diameter sits inside the true size. That means the drill removes less material around the circumference than intended, so the hole ends up smaller than the drill’s nominal size. A sharp edge, proper feed, and appropriate speed all help the drill cut to the intended size and avoid issues, whereas a worn margin directly reduces the effective diameter, leading to undersize holes.

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