Recommended values for drilling Xtra tec Insert Drill B421x Material 4140 CrMo-alloyed heat treatable steel Rm 750-900 N/mm2 Power requirement 1

Recommended values for drilling Xtra tec Insert Drill B421x Material 4140 CrMo-alloyed heat treatable steel Rm 750-900 N/mm2 Power requirement 1 P Hp 85.8 68.1 54.0 42.9 34.1 27.1 21.5 17.0 13.5 10.7 8.4 6.7 5.4 4.3 3.4 2.7 2.1 1.7 1.3 1.1 0.8 0.7 0.0016 0.0024 0.0039 0.0063 0.0098 f in/rev 0.0020 0.0031 0.0047 0.0079 0.0118 Dc in 0 4.724 0 3.937 0 3.150 0 2.362 0 1.969 0 1.575 0 1.181 0 0.984 Feed force Thrust 7194 5710 4532 3597 2855 2266 1798 1428 1133 899 714 567 450 357 283 225 178 142 112 89 71 56 0.0016 0.0024 0.0039 0.0063 0.0098 f in/rev 0.0020 0.0031 0.0047 0.0079 0.0118 Dc in 0 4.724 0 3.937 0 3.150 0 2.362 0 1.969 0 1.575 0 1.181 0 0.984 Mc ft 1510.5 1199.3 951.5 755.3 599.6 475.7 377.6 299.4 238.2 188.8 149.7 118.7 94.4 75.2 59.7 47.2 37.6 29.5 23.6 18.4 14.8 11.8 9.6 7.4 5.9 4.6 3.7 3.0 2.4 1.8 1.5 1.2 1.0 0.7 Torque lbs 0 0.7 87 0 0.630 1 0 0.5 31 Dc in 0 4.724 0 3.937 0 3.150 0 2.362 0 1.969 0 1.575 0 1.181 0 0.984 0.0016 0.0024 0.0039 0.0063 0.0098 0.0020 0.0031 0.0047 0.0079 0.0118 f in/rev The power requirement1 data is based on a cutting speed of 100 m/min. If the cutting speed is doubled, the power requirement also doubles, i.e. the power requirement is directly proportional to the cutting speed. For steels with a higher tensile strength, the power and torque required are correspondingly higher. C 215 Technical information Drilling WALTER Valenite