If the diameter is doubled while cutting speed remains the same, the RPM will

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Prepare for the Machinist Apprentice Level One Test. Utilize our flashcards and multiple-choice questions, with hints and thorough explanations for each. Get exam-ready now!

Multiple Choice

If the diameter is doubled while cutting speed remains the same, the RPM will

Explanation:
To keep cutting speed the same as the diameter changes, RPM must adjust inversely with diameter. The usual relationship is v = πDN (with consistent units), where v is the cutting speed, D is the diameter, and N is the RPM. If you double the diameter while v stays fixed, solving for N gives N = v / (πD). Doubling D makes the denominator twice as large, so N must be halved. In other words, the RPM decreases.

To keep cutting speed the same as the diameter changes, RPM must adjust inversely with diameter. The usual relationship is v = πDN (with consistent units), where v is the cutting speed, D is the diameter, and N is the RPM. If you double the diameter while v stays fixed, solving for N gives N = v / (πD). Doubling D makes the denominator twice as large, so N must be halved. In other words, the RPM decreases.

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