depth of cut (in) depth of cut (mm) depth of cut (in) depth of cut (mm) WIDIA™ VariTurn™ Stainless Steel • Austenitic Stainless Steels „Step 1 • Select the insert geometry Negative Inserts Positive Inserts feed rate (mm/rev) feed rate (mm/rev) 2P 1P Finishing Finishing 4P Medium feed rate (in/rev) feed rate (in/rev) 6P Roughing „Step 2 • Select the grade Negative Insert Positive Insert Geometry Geometry cutting condition 2P 4P 6P 1P heavily interrupted cut TN15M/TN10 TN30M TN30M TN30M/TN10 lightly interrupted cut TN15M/TN10 TN30M TN30M TN30M varying depth of cut,casting, or forging skin TN15M TN15M/TN30M TN15M/TN30M TN15M/TN30M smooth cut, pre-turned surface TN15M TN15M TN15M TN15M „Step 3 • Selecting the cutting speed Austenitic Stainless Steel speed — m/min Starting Conditions Material Group grade 90 135 180 225 270 315 360 405 450 m/min TN15M 162 TN30M 135 M1 TN10U 194 TN15U 129 Austenitic Stainless Steel speed — m/min Starting Conditions Material Group grade 90 135 180 225 270 315 360 405 450 m/min TN15M 149 TN30M 135 M2 TN10U 180 TN15U 120 Austenitic Stainless Steel: Duplex (Ferritic and Austenitic Mixture) speed — m/min Starting Conditions Material Group grade 90 135 180 225 270 315 360 405 450 m/min TN15M 135 TN30M 108 M3 TN10U 167 TN15U 111 B114 widia.com