If a 1-inch drill has lips at the same angle and it drills an oversize hole, what is the most likely cause?

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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

If a 1-inch drill has lips at the same angle and it drills an oversize hole, what is the most likely cause?

Explanation:
When a twist drill cuts, symmetric cutting edges keep the drill centered as it penetrates. If the two cutting lips are of different lengths, one lip will engage more metal than the other. That imbalance makes the drill wander off-center during drilling, which widens the hole and makes it oversize relative to the nominal diameter. Other common issues like dulling, low feed, or hard material can cause rough finishes, chatter, or accelerated wear, but they don’t as reliably explain a hole that consistently comes out larger when the lip angles are the same.

When a twist drill cuts, symmetric cutting edges keep the drill centered as it penetrates. If the two cutting lips are of different lengths, one lip will engage more metal than the other. That imbalance makes the drill wander off-center during drilling, which widens the hole and makes it oversize relative to the nominal diameter. Other common issues like dulling, low feed, or hard material can cause rough finishes, chatter, or accelerated wear, but they don’t as reliably explain a hole that consistently comes out larger when the lip angles are the same.

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