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10.2 Undercut parameters
DIN 76 – undercut parameters
The control determines the parameters for the thread
undercut (Undercut DIN 76) from the thread pitch. The
undercut parameters are in accordance with DIN 13 for
metric threads.
External thread
Thread pitch
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0.6
0.7
0.75
0.8
1
1.25
1.5
1.75
2
2.5
3
3.5
4
4.5
5
5.5
6
HEIDENHAIN | MANUALplus 620 | User's Manual | 12/2017
Internal thread
Thread pitch
0.2
0.25
0.3
0.35
0.4
I
K
R
W
0.45
0.3
0.7
0.1
30°
0.5
0.4
0.9
0.12 30°
0.6
0.5
1.05 0.16 30°
0.7
0.6
1.2
0.16 30°
0.75
0.7
1.4
0.2
30°
0.8
0.7
1.6
0.2
30°
1
0.8
1.75 0.2
30°
1.25
1
2.1
0.4
30°
1.5
1.1
2.45 0.4
30°
1.75
1.2
2.6
0.4
30°
2
1.3
2.8
0.4
30°
2.5
1.6
3.5
0.6
30°
3
2
4.4
0.6
30°
3.5
2.3
5.2
0.8
30°
4
2.6
6.1
1
30°
4.5
3
7
1
30°
5
3.6
8.7
1.2
30°
5.5
4.4
10.5 1.6
30°
6
5
12
1.6
30°
For internal threads, the control
5.7
14
2
30°
calculates the depth of the
thread undercut according to
6.4
16
2
30°
the following formula:
7
17 .5 2.5
30°
Undercut depth = (N + I - K) / 2
7 .7
19
3.2
30°
Where:
8.3
21
3.2
30°
I: Undercut depth
K: Underc. breadth
R: Undercut radius
W: Undercut angle
N: Nominal diameter of the
thread
I: From the table
K: Core diameter of the
thread
10
I
K
R
W
0.1
1.2
0.1
30°
0.1
1.4
0.12 30°
0.1
1.6
0.16 30°
0.2
1.9
0.16 30°
0.2
2.2
0.2
30°
0.2
2.4
0.2
30°
0.3
2.7
0.2
30°
0.3
3.3
0.4
30°
0.3
3.8
0.4
30°
0.3
4
0.4
30°
0.3
4.2
0.4
30°
0.5
5.2
0.6
30°
0.5
6.7
0.6
30°
0.5
7 .8
0.8
30°
0.5
9.1
1
30°
0.5
10.3 1
30°
0.5
13
1.2
30°
0.5
15.2 1.6
30°
0.5
17 .7 1.6
30°
0.5
20
2
30°
0.5
23
2
30°
0.5
26
2.5
30°
0.5
28
3.2
30°
0.5
30
3.2
30°
685
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