FORMULAE
Unit of Measurement
Kc [N/mm 2 ]
Parameter
Formula
M.G.
N · p · d 1 1000 1000 · V c p · d 1
P.1 P.2 P.3 P.4 P.5 P.6 P.7
1300 1400 1400 1600 1700 2000 1400 1600 1800 1100 1500 1600
__m__ min
V c =
Cutting speed
N =
Rotational speed
rpm
K c · p
2 · z 0,6 · d 1 10 4
M t =
Torque (*)
N · m
M t · 2 · p · N 60
P =
M.1 M.2 K.1 K.2 K.3 N.1 N.2 N.3 N.4 N.5 N.6 N.7 N.8 N.9 N.10
Spindle power
W
Nominal diameter
d 1
mm
_m_m__ min
Feed
p · N
600 800 900
p
Thread pitch
mm
1000
z
Number of flutes
-
700 850 900
Cutting force coefficient (function of the material and of tap wear)
__N__ mm 2
K c
2500
400 500
S.1 S.2 S.3 S.4
1200 1900 1300 2400
(*) The torque value is valid for a new cutting tap. For worn-out taps, the value can increase up to 2-3 times. For forming taps, the value must be multiplied by 1,5-2 times.
CONVERSION TABLE HARDNESS VS TENSILE STRENGTH
Tensile Strength R [N/mm 2 ]
Tensile Strength R [N/mm 2 ]
Hardness
Hardness
HB Brinell
HRC Rockwell C
HV Vickers
HB Brinell
HRC Rockwell C
HV Vickers
3400 3120 2960 2890 2770 2240 2190 2140 2100 2050 2010 1970 1930 1890 1850 1810 1780 1730 1680 1630 1590 1560 1520 1480 1440
700 688 676 670 659 650 635 627 613 600 587 574 561 548 536 524 512 500 488 476 464 453 442 430 419
68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44
1008
1400 1360 1320 1300 1260 1230 1190 1150 1120 1100 1060 1040 1010
408 398 389 377 367 357 347 337 327 319 309 301 294 286 279 272 265 259 253 247 241 235 230 225
43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20
427 416 404 391 381 371 357 345 332 323 314 304 296 288 280 273 266 259 253 247 241 235 230 225
955 920 885 850 826 797 772 746 720 693 666 646 623 604 585 567 549 528 513 497 482 468 453 440
980 960 940 910 890 870 850 830 810 790 770
253
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