Technical Information

Technial Information

Deep Insights. Smarter Decisions. Better Machining.

At MSI, we understand that performance comes from more than just the right tool — it stems from knowledge, data, and precision. This page is your hub for technical resources, practical guidance, and expert insights to help you optimize your processes, choose the right products, and push your machining capabilities further.

Milling Formulas

Milling formulas provide quick reference calculations for speed, feed, and power, helping you optimize machining performance and accuracy.

sfm = rpm × D 3.82

rpm = 3.82 × sfm D

F = f × Z × rpm

f = F Z × rpm

MRR = W × d × F

DBT = 3.1416 × D Z

HPc = 3 × MRR K

HPm = HPc E

Symbols and Measurement Units

Diameter of milling cutter (inches)

Depth of cut (inches)

Feed rate (inches per minute)

ADV/R

Advance per revolution (inches)

Feed (inches per tooth)

Power constant of work material

MRR

Metal Removal Rate (cubic in./min.)

rpm

Revolutions per minute (cutter spindle)

Number of teeth in the cutter

sfm

Surface feet per minute

Width of cut (inches)

HPc

Horsepower at the cutter

HPm

Horsepower at the motor

DBT

Distance between teeth (inches)

Spindle efficiency (75% – 90%)