Negative Insert GeometryPositive Insert Geometry
cutting condition-FF-ML-UR..MA-FP-MU-MP
heavily interrupted cutWK20CTWK20CTWK20CTWK20CTWK20CTWK20CTWK20CT
lightly interrupted cutWK20CTWK20CTWK20CTWK20CTWK20CTWK20CTWK20CT
varying depth of cut, casting, or forging skinWK20CTWK05CTWK20CTWK05CTWK20CTWK20CTWK20CT
smooth cut, pre-turned surfaceWK20CTWK05CTWS10PTWK05CTWK20CTWK20CT/ WK05CT/ WS10PTWK20CT

WS10PT

  • Step 3 • Select the cutting speed
Grey Cast Ironspeed — m/minStarting Conditions
material

group grade 60 180 305 430 550 675 800 920 1040 1160 m/min

WK05CT 450 K1 WK20CT 300

Ductile, Compacted Graphite, and Malleable Cast Irons

(<600 MPa tensile strength)speed — m/minStarting Conditions
material
groupgrade90135180225275320360410460500m/min
WS10PT200
K2WK05CT360

WK20CT 240

Ductile, Malleable, and Austempered Cast Irons

(>600 MPa tensile strength)speed — m/minStarting Conditions
material
groupgrade90135180225275320360410460500m/min
WS10PT150
K3WK05CT240

WK20CT 210