1 under c ut and thr ead p a ra met e rs – HEIDENHAIN CNC Pilot 4290 V7.1 User Manual
Page 685
HEIDENHAIN CNC PILOT 4290
685
1
1
.1 Under
c
ut and Thr
ead P
a
ra
met
e
rs
For internal threads, the CNC PILOT calculates the depth of the thread
undercut according to the following formula:
Undercut depth = (N + I – K) / 2
Where:
I: Undercut depth (radius)
K: Undercut width
R: Undercut radius
W: Undercut angle
N: Nominal diameter of the thread
I: From the table
K: Core diameter of the thread
Internal thread
Internal thread
Thread pitch
I
K
R
W
Thread pitch
I
K
R
W
0.2
0.1
1.2
0.1
30°
1.25
0.5
6.7
0.6
30°
0.25
0.1
1.4
0.12
30°
1.5
0.5
7.8
0.8
30°
0.3
0.1
1.6
0.16
30°
1.75
0.5
9.1
1
30°
0.35
0.2
1.9
0.16
30°
2
0.5
10.3
1
30°
0.4
0.2
2.2
0.2
30°
2.5
0.5
13
1.2
30°
0.45
0.2
2.4
0.2
30°
3
0.5
15.2
1.6
30°
0.5
0.3
2.7
0.2
30°
3.5
0.5
17.7
1.6
30°
0.6
0.3
3.3
0.4
30°
4
0.5
20
2
30°
0.7
0.3
3.8
0.4
30°
4.5
0.5
23
2
30°
0.75
0.3
4
0.4
30°
5
0.5
26
2.5
30°
0.8
0.3
4.2
0.4
30°
5.5
0.5
28
3.2
30°
1
0.5
5.2
0.6
30°
6
0.5
30
3.2
30°