Max Material Removal Rate from Spindle Power
The inverse of the cutting-power tile: the power-limited max removal rate a spindle can drive, max MRR = motor hp x efficiency / unit power. A 5 hp spindle at 80% efficiency removes up to 4.0 in3/min of carbon steel (unit power 1.0), or 12.1 in3/min of aluminum (0.33). The stall limit only -- depth/feed, tool strength, and rigidity are separate. The tool and machine govern the real cut.
Formula and source
max MRR (in3/min) = available motor hp x (efficiency / 100) / unit power (hp per in3/min); the specific-cutting-energy relation solved for the removal rate.
Cutting power solved for the removal rate - first-principles specific-cutting-energy relation with Machinery's Handbook (Industrial Press) unit-power values, by name.
Audience
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