Use this engineering calculation for a transparent preliminary estimate or independent arithmetic check when geometry, materials, loads, operating conditions, and units are defined consistently.

Diameter Millimeters (mm)

Required number input.

Speed Rpm (rpm)

Required number input.

Cutting surface speed in meters per minute from rotating tool or workpiece diameter in millimeters and spindle RPM. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Meters Per Minute (m/min)

The resulting meters per minute returned as a number.

• Cutting speed and drilling time are nominal planning values. Tool material and geometry, workpiece machinability, feed, depth, coolant, rigidity, acceleration, chip evacuation, wear, and setup time determine practical cycle time and quality.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check assumptions against drawings, measurements, current material data, and the applicable design code. Apply required load combinations and safety factors, then obtain qualified review and testing for consequential designs.

• Drill Time

  Ideal drilling feed time from hole depth plus approach, feed per revolution and spindle speed; excludes tool changes.

• Feed Rate

  Milling table feed rate from feed per tooth, cutter flute count and spindle RPM.

• Grinding Removal Rate

  Ideal grinding removal volume per minute from contact width, cut depth and workpiece feed.