CNC Cutting Machine Practice Test

A 0.500-inch diameter cutter is to run at 300 surface feet per minute. Using RPM = (SFM × 3.82) ÷ diameter, what spindle speed is closest?

1146 RPM 1910 RPM 2292 RPM 3000 RPM

2292 RPM

RPM = (300 × 3.82) ÷ 0.500 = 2292 RPM, so 2292 RPM is the closest setting.

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