Gear Cutting Tools

Basic hob profiles
to DIN 58412
Symbols:
h fP0 = dedendum of the basic profile
h Pw = distance beween the tooth root
and the end of the straight flank
of the basic profile
h P0 = profile height of the basic profile
h P = profile height of
the gear = cutting depth
s P0 = π · m = tooth thickness
2
ö aP0 = tip radius
ö fP0 = root fillet radius
U 1
}
For gears with basic
N 1 cutter profile
V 1
to DIN 58400
U 2
}
For gears with basic
N 2 cutter profile
V 2
to DIN 867
DIN 58412 – basic profile U I –
topping – 20° pressure angle
h fP0 = 1,1 · m
h Pw = 2,2 · m
h Pw = 2,2 · m
h P =h P0 = 2,6 · m from module 0,1 ÷ 0,6
h P =h P0 = 2,45 · m over module 0,6 ÷ 1
ö aP0 ≈ 0,2 · m
ö fP0 ≈ 0,2 · m max. size
for finishing
Fig. 3.00
DIN 58412 – basic profile N 1 –
non-topping – 20° pressure angle
h fP0 = 1,3 · m
h Pw = 2,4 · m
h P = 2,6 · m from module 0,1 ÷ 0,6
h P = 2,45 · m over module 0,6 ÷ 1
h P0 = 2,8 · m from module 0,1 ÷ 0,6
h P0 = 2,65 · m over module 0,6 ÷ 1
ö aP0 ≈ 0,2 · m
ö fP0 ≈ 0,2 · m max. size
for finishing
Fig. 3.01
DIN 58412 – basic profile U 2 –
topping – 20° pressure angle
h fP0 = 1 · m
h Pw =2 ·m
h P =h P0 = 2,25 · m
ö aP0 = 0,2 · m
ö fP0 = 0,2 · m max. size
for finishing
Fig. 3.02
ö aP0 15°
s P0
hPw h P0
h fP0
ö fP0 20°
ö aP0 15°
s P0
h P hPw h P0
h fP0
ö fP0 20°
s P0
ö aP0 15°
hPw h P0
ö fP0 20°
h fP0
DIN 58412 – basic profile N 2 –
non-topping – 20° pressure angle
h fP0 = 1,2 · m
h Pw = 2,2 · m
h P = 2,25 · m
h P0 = 2,45 · m
ö aP0 = 0,2 · m
ö fP0 = 0,2 · m max. size
for finishing
Fig. 3.03
ö aP0 15°
s P0
hPw h P0
h fP0
ö fP0 20°
DIN 58412 – basic profile V 1 –
non-topping – 20° pressure angle
h fP0 = 1,3 · m
h P = 2,6 · m from module 0,3 ÷ 0,6
h P = 2,45 · m over module 0,6 ÷ 1
h P0 = 2,8 · m from module 0,3 ÷ 0,6
h P0 = 2,65 · m over module 0,6 ÷ 1
s P0 = π · m – 2q
2 cos α
ö aP0 = 0,1 · m
ö fP0 = 0,2 · m max. size
q = 0,05 · m + 0,03
for pre-machining
Fig. 3.04
h P
h P
ö fP0
20°
ö aP0
s P0
q
h fP0
h P0
DIN 58412 – basic profile V 2 –
non-topping – 20° pressure angle
h fP0 = 1,2 · m
h P = 2,25 · m
h P0 = 2,45 · m
s P0 = π · m – 2q
2 cos α
ö aP0 = 0,1 · m
ö fP0 = 0,2 · m max. size
q = 0,05 · m + 0,03
for pre-machining
h P
ö aP0
ö fP0
20°
s P0
q
h fP0
h P0
Fig. 3.05
142