Feed Speed Formula

Rpm x no. of teeth	x	chip load	=	Feed Speed
12 (inches per foot)

Known:

No. Of Teeth ------- 60

RPM --------------- 3600

Chip Load ---------- 0.005”

Example:

3600 x 60 = 216,000 = 18,000 x .005 = 90

12 12

Feed Speed is 90 feet per minute

Tooth Quantity Formula

Formula

Feeds speed (fpm) x 12	=	no. of teeth
Rpm x chip load

Known:

Feed Speed ----------- 90 Rpm

RPM ------------------- 3600

Chip Load ------------ 0.005”

Example:

90 x 12	=	1080	=	60
3600 x 0.005		18

Number of Teeth is 60