192 ISO Programming
4.4 Contour Form Elements
Undercut DIN 76 (H=7)
Program only FP. All the other values are automatically calculated from
the thread pitch in the standard table if they are not defined.
Undercut type H (H=8)
If you do not enter W, the angle will be calculated on the basis of K and
R. The final point of the undercut is then located at the “contour
corner.”
Example: Call G25-Geo DIN 76
. . .
N.. G1 Z-15 [longitudinal element]
N.. G25 H7 FP2 [DIN 76]
N.. G1 X20 [transverse element]
. . .
Parameters
H Undercut type DIN 76: H=7
I Undercut depth (radius)
K Width of undercut
R Undercut radius in both corners of the undercut (default:
R=0.6*I)
W Undercut angle (default: 30°)
FP Thread pitch
BE, BF, BD, BP and BH (see “Machining attributes for form
elements” on page 181)
Example: Call G25-Geo type H
. . .
N.. G1 Z-15 [longitudinal element]
N.. G25 H8 K4 R1 W30 [type H]
N.. G1 X20 [transverse element]
. . .
Parameters
H Undercut type H: H=8
K Width of undercut
R Undercut radius—no value: The circular element is not
machined
W Plunge angle—no value: W is calculated
BE, BF, BD, BP and BH (see “Machining attributes for form
elements” on page 181)
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