Milling Cutter- Rake Angles

Posted: 24th June 2013 by brednane1981 in Milling, Super Tool

Recommended Rake Angles for Milling CuttersMilling Cutter

The radial rake angle of an arbor hole style milling cutter or slitting saw is the angle between the tooth face and a radial line passing through the cutting edge in a plane perpendicular to the cutter axis that the tooth sits at relative to the center of a milling cutter.  It can be positive or negative.  This angle is important because different materials machine better at different rake angles all other things being equal.

Below is a diagram showing how the rake angle of a milling cutter is measured.

Rake Model

 

Below are some general recommendations for rake angles when machining certain materials:

CLASS OF MATERIALS

MATERIAL EXAMPLES

RECOMMENDED RADIAL RAKE ANGLE

NON-FERROUS (SOFT)

ALUMINUM ALLOY – WROUGHT

10°

MAGNESIUM ALLOY
LEAD ALLOY
NON-METAL AND PLASTIC
ZINC ALLOY – DIE CAST

NON-FERROUS (HARD)

ALUMINUM BRONZE

5 to 10°

BRASS ALLOY – LEADED AND FREE CUTTING
NICKEL SILVER
COPPER ALLOY – TOUGH

CAST IRON

DUCTILE CAST IRON – AUSTENITIC

DUCTILE CAST IRON – FERRITIC
DUCTILE CAST IRON – MARTENSITIC
GRAY – PEARLITIC
GRAY – FERRITIC
MALLEABLE CAST IRON – MARTENSITIC

LOW CARBON STEELS

LOW AND MEDIUM CARBON STEEL – FREE MACHINING

0° to 3°

LOW AND MEDIUM CARBON STEEL – WROUGHT

MEDIUM STRENGTH STEELS

LOW AND MEDIUM CARBON ALLOY STEEL – FREE MACHINING

0° to 3°

LOW AND MEDIUM CARBON  ALLOY STEEL
STAINLESS STEEL – 400 SERIES

3° to 5°

STAINLESS STEEL – 400 SERIES FREE MACHINING

HIGH STRENGTH STEELS

HIGH STRENGTH STEEL – WROUGHT & TOOL STEEL

0° to 3°

HIGH TEMP ALLOYS

HIGH TEMP ALLOYS – NICKEL & IRON BASE ALLOY

STAINLESS STEEL – 300 SERIES
STAINLESS STEEL – PH SERIES
TITANIUM ALLOY

 

Every application is unique so it is best to check with the manufacturer of your cutting tool to help determine the appropriate cutter (and rake angle) for your application.

If you have any questions about rake angles (or any other cutting tool questions) feel free to leave us a comment here on our blog or fill out the form on Super Tool’s Contact Us Page.

Bryan Enander
Super Tool, Inc
941-751-9677

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  1. Bryan
    This is a nice chart.
    The other thing that is very important in a carbide tool is the edge prep.
    perhaps it could be incorporated.