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

Hole Depth Millimeters (mm)

Required number input.

Approach Millimeters (mm)

Required number input.

Feed Millimeters Per Revolution (mm/rev)

Required number input.

Speed Rpm (rpm)

Required number input.

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

Time Minutes (min)

The resulting time minutes 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.

• Machining Time Lathe

  Straight turning time from axial cut length, feed per revolution and spindle speed; excludes approach and tool changes.

• Reaming Time

  Ideal straight reaming feed time from cut length, feed per revolution and spindle speed; excludes tool changes.

• Grinding Removal Rate

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