Helical Mills Helical Millls • M390 Series Recommended Starting Speeds (Recommended Starting Speeds [m/min] — continued) MaterialGroup TN7535 WK15CM WS30PM 0 455 395 370 – – – – – – 1 455 395 370 – – – – – – 2 280 255 230 – – – – – – P 3 255 230 205 – – – – – – 4 190 175 160 – – – – – – 5 260 230 210 – – – – – – 6 160 135 110 – – – – – – 1 205 185 155 – – – 225 200 185 M 2 185 160 140 – – – 205 180 145 3 145 130 115 – – – 155 135 105 1 295 265 240 420 385 340 – – – K 2 235 210 190 335 295 275 – – – 3 195 175 160 280 250 230 – – – 1 – – – – – – – – – N 2 – – – – – – – – – 3 – – – – – – – – – 1 – – – – – – 45 40 30 2 – – – – – – 45 40 30 S 3 – – – – – – 55 45 30 4 – – – – – – 85 60 40 1 – – – – – – – – – H 2 – – – – – – – – – 3 – – – – – – – – – NOTE: FIRST choice starting speeds are in bold type. As the average chip thickness increases, the speed should be decreased. Recommended Starting Feeds „Recommended Starting Feeds [mm] Light General Heavy Machining Purpose Machining Programmed Feed per Tooth (fz) as a % of Radial Depth of Cut (ae) Insert Insert Geometry 5% 10% 20% 30% 40–100% Geometry .F..ALP 0,12 0,23 0,46 0,08 0,17 0,33 0,06 0,13 0,25 0,06 0,11 0,22 0,05 0,10 0,20 .F..ALP .E..ML 0,12 0,35 0,58 0,08 0,25 0,42 0,06 0,19 0,31 0,06 0,17 0,27 0,05 0,15 0,25 .E..ML .S..MM 0,12 0,42 0,70 0,08 0,30 0,50 0,06 0,23 0,38 0,06 0,20 0,33 0,05 0,18 0,30 .S..MM .S..MH 0,23 0,54 0,85 0,17 0,39 0,61 0,13 0,29 0,46 0,11 0,25 0,40 0,10 0,23 0,36 .S..MH NOTE: Use “Light Machining” value as starting feed rate. widia.com K9