Page 1037 - Tungaloy Catalog

Technical Reference
Drilling Tools
Nomenclature for drills

Shank
Lead

Point angle Diameter

Helix angle

Flute length Shank length
Overall length

Thinning edge
Thinning
Web thickness
Cutting edge Thinning
Secondary relief
Primary relief Margin
Secondary
relief
Oil hole Chisel Primary relief

Heel Body clearance Chisel edge

Cutting forces and power requirement

d Twist drill dMaterial constant compensating for power requirement and thrust force
Power requirement Tensile strength Brinell Material
Work material 2 2 hardness constant
2
Pc=KD n ( 0.647 + 17.29f )×10 -6 MPa (N/mm ) Kgf/mm (HB) (K)
c
(kW) Cast iron 210 21 177 1.00

Cast iron 280 28 198 1.39

Thrust force Technical Reference

Cast iron 350 35 224 1.88
Tc=570KDcf 0.85

(N) Aluminum 250 25 100 1.01

Low carbon steel (JIS S20C) 550 55 160 2.22
Torque
Free cutting steel (JIS SUM32) 620 62 183 1.42

KD ( 0.630 + 16.84f) Manganese steel (JIS SMn438) 630 63 197 1.45

2
Mc= c 14

(N·m) 100 Nickel chromium steel (JIS SNC236) 690 69 174 2.02

4115 steel Cr0.5, Mo0.11, Mn0.8 630 63 167 1.62
Pc : Power requirement (kW) Chr omium molybdenum steel (JIS SCM430) 770 77 229 2.10
Tc : Thrust force (N) Chr omium molybdenum steel (JIS SCM440) 940 94 269 2.41

Mc : Torque (N·m) Nickel chromium molybdenum steel (JIS SNCM420) 750 75 212 2.12

Dc : Drill diameter (in) Nickel chromium molybdenum steel (JIS SNCM625) 1,400 140 390 3.44
f : Feed (ipr) Chromium vanadium steel

n : No. of revolutions (min ) Cr0.6, Mn0.6, V0.12 580 58 174 2.08
-1

K : Material constant .... Refer to the table at right Cr0.8, Mn0.8, V0.1 800 80 255 2.22
14–19