Operation Manual

616 Tables and overviews
9.2 Undercut parameters
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: Width of undercut
 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°