Technical information

Formulae

Table of formulae

Parameter Formula Unit of measurement
Cutting speed (Vc) N · π · d1
1000
m
min
Rotational speed (N) 1000 · Vc
π . d1
rpm
Torque* (Mt) Kc · p2 · z0,6 · d1
104
N·m
Spindle power (P) Mt · 2 · π · N
60
W
Nominal diameter d₁ mm
Feed p·N mm
mm
p Thread pitch mm
z Number of flutes
Kc Cutting force coefficient (function of the material and of tap wear) N
mm²

Material reference

Material group Kc [N/mm²]

Steel

P.1
Mild / magnetic steel 1300
P.2
Construction steel, case hardening steel 1400
P.3
Carbon steel 1400
P.4
Alloyed steel / tempered steel 1600
P.5
Alloyed steel / tempered steel 1700
P.6
Alloyed steel / high strength steel 2000
P.7
Ferritic stainless steel, martensitic stainless steel, precipitation hardening 1400

Stainless steel

M.1
Austenitic stainless steel 1600
M.2
Ferritic+austenitic (Duplex) 1800

Cast iron

K.1
Grey cast iron 1100
K.2
Nodular cast iron, malleable cast iron, tempered cast iron 1500
K.3
Austempered ductile iron (ADI) 1600

Non-ferrous metals

N.1
Pure aluminium 600
N.2
Aluminium wrought and die cast alloys with Si < 0,5% (long chipping) 800
N.3
Aluminium wrought and die cast alloys with Si > 10% (medium chipping) 900
N.4
Aluminium die cast alloys with Si > 10% (short chipping) 1000
N.5
Pure copper 700
N.6
Copper alloys (long chipping), soft brass 850
N.7
Copper alloys (short chipping), hard brass 900
N.8
High strength bronze 2500
N.9
Pure magnesium, magnesium alloys 400
N.10
High strength magnesium alloys 500

Super alloys and titanium

S.1
Pure titanium 1200
S.2
Titanium alloys 1900
S.3
Pure nickel 1300
S.4
Nickel alloys 2400

Hardened materials

H.1
Alloyed steel, hardness HRC 44-55
H.2
Alloyed steel, hardness HRC 56-63

(*) 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.

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