ShopCalc Pro

byShopWare

Big Buttons. Big Results. Big Value.

Surface Speed → RPM → Feed Rate

Enter values in order - RPM and Feed Rate calculate automatically as you type

1. Surface Speed (SFM)

2. Diameter (inches)

3. Number of Teeth (1 for drill)

4. Feed Per Tooth (inches)

Formulas

Step 1: RPM = (SFM × 12) ÷ (π × Diameter)

Step 2: Feed Rate (IPM) = RPM × Number of Teeth × Feed Per Tooth

Always reference manufacturer's published recommendations for operation. We do not take liability for damages to persons or property resulting from use of this app.