HEIDENHAIN 548431-05, User Manual, Page: 685 / 722

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HEIDENHAIN | MANUALplus 620 | User's Manual | 12/2017
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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 I K R W
0.2 0.3 0.7 0.1 30°
0.25 0.4 0.9 0.12 30°
0.3 0.5 1.05 0.16 30°
0.35 0.6 1.2 0.16 30°
0.4 0.7 1.4 0.2 30°
0.45 0.7 1.6 0.2 30°
0.5 0.8 1.75 0.2 30°
0.6 1 2.1 0.4 30°
0.7 1.1 2.45 0.4 30°
0.75 1.2 2.6 0.4 30°
0.8 1.3 2.8 0.4 30°
1 1.6 3.5 0.6 30°
1.25 2 4.4 0.6 30°
1.5 2.3 5.2 0.8 30°
1.75 2.6 6.1 1 30°
2 3 7 1 30°
2.5 3.6 8.7 1.2 30°
3 4.4 10.5 1.6 30°
3.5 5 12 1.6 30°
4 5.7 14 2 30°
4.5 6.4 16 2 30°
5 7 17.5 2.5 30°
5.5 7.7 19 3.2 30°
6 8.3 21 3.2 30°
Internal thread
Thread pitch I K R W
0.2 0.1 1.2 0.1 30°
0.25 0.1 1.4 0.12 30°
0.3 0.1 1.6 0.16 30°
0.35 0.2 1.9 0.16 30°
0.4 0.2 2.2 0.2 30°
0.45 0.2 2.4 0.2 30°
0.5 0.3 2.7 0.2 30°
0.6 0.3 3.3 0.4 30°
0.7 0.3 3.8 0.4 30°
0.75 0.3 4 0.4 30°
0.8 0.3 4.2 0.4 30°
1 0.5 5.2 0.6 30°
1.25 0.5 6.7 0.6 30°
1.5 0.5 7.8 0.8 30°
1.75 0.5 9.1 1 30°
2 0.5 10.3 1 30°
2.5 0.5 13 1.2 30°
3 0.5 15.2 1.6 30°
3.5 0.5 17.7 1.6 30°
4 0.5 20 2 30°
4.5 0.5 23 2 30°
5 0.5 26 2.5 30°
5.5 0.5 28 3.2 30°
6 0.5 30 3.2 30°
For internal threads, the control
calculates the depth of the
thread undercut according to
the following formula:
Undercut depth = ( N + I - K ) / 2
Where:
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