After determining the desired chip thickness (FPT – see Recommended Cutting Speeds chart PDF), find the Depth of Cut intersection in the chart. Multiply the desired chip thickness by the factor shown in the chart. This will be the Adjusted Feed per Tooth (AFPT), resulting in a true chip thickness of the desired amount.

Example:

@ .03" Depth of Cut (DOC), the factor for the chip thickness = 2.1. So, if a chip thickness of .005" is desired, a feed rate of .0105" (.005 x 2.1) needs to be programmed into the machine tool.

Or:

Adjusted Feed per Tooth (AFPT) = chip thickness x chip thinning factor (from chart)

  Insert Diameter
Depth of Cut (DOC)   12mm
0.005 5.0
0.010 3.6
0.015 2.9
0.020 2.6
0.025 2.3
0.030 2.1
0.035 2.0
0.040 1.8
0.050 1.7
0.060 1.5
0.075 1.4
0.085 1.3
0.100 1.3
0.125 1.2
0.150 1.1
0.180 N/R
0.200 N/R
>0.200 N/R