Free End Mill Chip Thinning Calculator

Precision feed rate compensation for CNC machining.

Parameters

Tool Diameter (inch)

Radial Depth of Cut ($ae$)

Target Chip Load (IPT)

Spindle Speed (RPM)

Number of Flutes

Results

Adjusted Feed Rate

0.00

IPM

Base Feed Rate: 0.00

Thinning Factor: 1.00

Technical Context

Chip thinning occurs when the radial depth of cut ($ae$) is less than half the tool diameter. By compensating for this effect, you can increase your feed rate to maintain the target chip load, improving tool life and material removal rates. Note: This tool is for estimation only. Always refer to manufacturer data for specific machining parameters.

Formula Details

The chip thinning compensation factor is calculated using:

CF = 1 / sqrt(2 * (ae / D) - (ae / D)²)

CF: Chip Thinning Factor
ae: Radial Depth of Cut
D: Tool Diameter

If the calculated factor is less than 1 (e.g., full slotting where ae/D >= 0.5), the factor is capped at 1.0, as thinning does not apply.