What does SFM stand for in cutting speed terminology?

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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

What does SFM stand for in cutting speed terminology?

Explanation:
Surface feet per minute describes how far a point on the workpiece surface moves past the cutting edge in one minute. It’s the standard speed metric used to set cutting speeds in turning and milling, guiding how fast the tool should cut to balance productivity and tool life. In practice, you relate SFM to spindle RPM and workpiece diameter with the formula SFPM = (π × diameter in inches × RPM) / 12, since each revolution moves the surface a distance equal to the circumference. The term is widely used as “surface feet per minute” (SFPM), so the other proposed phrases don’t match common cutting-speed terminology.

Surface feet per minute describes how far a point on the workpiece surface moves past the cutting edge in one minute. It’s the standard speed metric used to set cutting speeds in turning and milling, guiding how fast the tool should cut to balance productivity and tool life. In practice, you relate SFM to spindle RPM and workpiece diameter with the formula SFPM = (π × diameter in inches × RPM) / 12, since each revolution moves the surface a distance equal to the circumference. The term is widely used as “surface feet per minute” (SFPM), so the other proposed phrases don’t match common cutting-speed terminology.

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