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Spindle Speed Calculator
Calculate milling spindle speed in RPM from surface speed and tool diameter
Spindle Speed Formula: $\text{RPM} = \frac{\text{SFM} \times 3.82}{\text{Diameter (inches)}}$. This calculates the optimal rotational speed for machining operations.
Tool Parameters
Calculation Results
⚠️ Spindle speed recommendations vary depending on material hardness, tool coating, and machine rigidity. Always check manufacturer cutting data recommendations.