Multistage drill Drills to romove broken taps Drilling tools SELECTION TABLE WST WDG Center drills Deburring tools Countersinks Taperreamers Deburring tool with PF solid pilot Norm NC NC DIN-333 DIN-6537L DIN-6537L DIN-335 DIN-335 DIN-373 A / B / R / EL Tolerance Page number 165 166 167 167 168 - 171 172 172 174 174 176 177 178 Geometry δ90° δ120° δ60° δ90° δ90° δ90° δ30 / 45 / 60° External coolant HSSE / Material HSS VHM HSSE HSSE HSS / VHM VHM HSSE VHM HSS HSS VHM Coating - / TN2 AT TN2 TN2 TN2 / AT AT AT - / TN2 / TC AT - - - Range of 2,5÷10,2 3÷16 2,5÷10,2 0,8÷10 4÷20 4÷20 diameter TABLE OF RECOMMENDED FEED MM/REV FOR DRILLS Drill diameter Group Ć1 Ć2 Ć3 Ć4 Ć5 Ć6 Ć8 Ć10 Ć12 Ć14 Ć16 Ć20 a 0,015 0,030 0,038 0,047 0,053 0,060 0,075 0,090 0,100 0,120 0,127 0,160 b 0,020 0,050 0,070 0,085 0,100 0,120 0,150 0,180 0,200 0,230 0,250 0,270 c 0,023 0,080 0,100 0,130 0,150 0,180 0,250 0,270 0,280 0,300 0,330 0,370 d 0,030 0,100 0,160 0,180 0,220 0,240 0,300 0,370 0,400 0,450 0,480 0,500 e 0,035 0,120 0,200 0,250 0,270 0,300 0,350 0,450 0,470 0,500 0,530 0,550 f 0,050 0,150 0,220 0,250 0,320 0,400 0,490 0,620 0,650 0,720 0,850 0,900 g 0,070 0,160 0,250 0,270 0,360 0,470 0,620 0,830 0,900 0,950 1,100 1,200 h 0,090 0,200 0,270 0,300 0,400 0,520 0,750 1,000 1,100 1,200 1,300 1,350 The symbols of feed groups are given in the drills selection table by the recommended cutting speed 8