Chip Per Tooth Calculator

Formula

The formula to calculate the Chip Per Tooth (CPT) is:

\[ CPT = \frac{FR}{SS \times NT} \]

Where:

\( CPT \) is the chip per tooth (inches)
\( FR \) is the feed rate (inches per minute)
\( SS \) is the spindle speed (revolutions per minute)
\( NT \) is the number of teeth on the cutter

What is Chip Per Tooth?

Chip per tooth is a measure of the thickness of the material removed by each tooth of a cutting tool, such as a milling cutter, during one revolution. It is a critical parameter in machining that affects the surface finish, cutting forces, tool life, and the overall efficiency of the machining process. Proper selection of chip per tooth values can lead to improved productivity and better quality of the machined parts.

Example

Let's say the feed rate (FR) is 100 inches/min, the spindle speed (SS) is 2000 RPM, and the number of teeth on the cutter (NT) is 4. Using the formula:

\[ CPT = \frac{100}{2000 \times 4} = 0.0125 \, \text{inches} \]

So, the chip per tooth (CPT) is 0.0125 inches.