TechTip #3 CA - Selecting the proper angle

A.

HELIX ANGLE - EFFECTS ON CUTTING FORCE By increasing the Helix Angle:

- Axial Force F z , increase (and the ratio F_ AX /F_ TAN ) - Cutting forces in the XY plane decrease - The delay between the cutting edge “slices” engaged increase. - Reduction of the Torque

B.

HELIX ANGLE - EFFECTS ON CHIP EVACUATION By increasing the Helix Angle: - The flute section effective for chip evacuation decreases in surface - The direction of chip evacuation changes: ▪ Chips are pulled up more with a “Corkscrew Effect”

45•/

HELIX ANGLE - SQUARE SHOULDER END MILLS 30• C. ▪ Wide chip flutes

▪ Small axial forces (reduced risk of pull out from the holder

50•

45•/

▪ Wide chip flutes ▪ Small axial forces (reduced risk of pull out from the holder

60•

▪ Good surface finish (finishing/super finishing) ▪ Smallest possible tool deflection

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