Formulas and deinitions
A
Formulas and deinitions for drilling - METRIC
Turning
Penetration rate, mm/min B
vf = fn × n
Parting and
grooving
Cutting speed, m/min C
π × Dc × n
vc =
1000
Threading
Designation/
Spindle speed, r/min D
deinition
Symbol
vc × 1000
Unit
n=
π × Dc
Milling
Dc Drill diameter mm
fn Feed per revolution mm/r
Feed force, N
E
Ff ≈ 0.5×kc × c fn × sin kr
n Spindle speed rpm
D
vc Cutting speed m/min
2
vf Penetration rate mm/min
Drilling
Ff Feed force N
Metal removal rate, cm3/min kc Speciic cutting force N/mm2
Mc Torque Nm F
v × Dc × fn
Q= c Pc Net power kW
4
kr
Q Metal removal rate cm3/min
Boring
Entering angle degree
Net power, kW
G
v × Dc × fn × kc
Pc = c
240 × 103
Tool holding
Torque, Nm
H
Pc × 30 × 103
Other information
Mc =
π×n
Machinability
H 81
A
Formulas and deinitions for drilling - METRIC
Turning
Penetration rate, mm/min B
vf = fn × n
Parting and
grooving
Cutting speed, m/min C
π × Dc × n
vc =
1000
Threading
Designation/
Spindle speed, r/min D
deinition
Symbol
vc × 1000
Unit
n=
π × Dc
Milling
Dc Drill diameter mm
fn Feed per revolution mm/r
Feed force, N
E
Ff ≈ 0.5×kc × c fn × sin kr
n Spindle speed rpm
D
vc Cutting speed m/min
2
vf Penetration rate mm/min
Drilling
Ff Feed force N
Metal removal rate, cm3/min kc Speciic cutting force N/mm2
Mc Torque Nm F
v × Dc × fn
Q= c Pc Net power kW
4
kr
Q Metal removal rate cm3/min
Boring
Entering angle degree
Net power, kW
G
v × Dc × fn × kc
Pc = c
240 × 103
Tool holding
Torque, Nm
H
Pc × 30 × 103
Other information
Mc =
π×n
Machinability
H 81
