HEIDENHAIN TNC 620 User Manual page 354

9
Example: Concave cylinder machined with ball-nose
cutter
Program run
This NC program works only with a ball-nose cutter.
The tool length is measured from the sphere center
The contour of the cylinder is approximated by many
short line segments (defined in Q13). The more line
segments you define, the smoother the contour
becomes.
The cylinder is milled in longitudinal cuts (here:
parallel to the Y axis).
The milling direction is determined with the starting
angle and end angle in space:
Machining direction clockwise:
Starting angle > end angle
Machining direction counterclockwise:
Starting angle < end angle
The tool radius is compensated automatically
0 BEGIN PGM CYLIN MM
1 FN 0: Q1 = +50
2 FN 0: Q2 = +0
3 FN 0: Q3 = +0
4 FN 0: Q4 = +90
5 FN 0: Q5 = +270
6 FN 0: Q6 = +40
7 FN 0: Q7 = +100
8 FN 0: Q8 = +0
9 FN 0: Q10 = +5
10 FN 0: Q11 = +250
11 FN 0: Q12 = +400
12 FN 0: Q13 = +90
13 BLK FORM 0.1 Z X+0 Y+0 Z-50
14 BLK FORM 0.2 X+100 Y+100 Z+0
15 TOOL CALL 1 Z S4000
16 L Z+250 R0 FMAX
17 CALL LBL 10
18 FN 0: Q10 = +0
19 CALL LBL 10
20 L Z+100 R0 FMAX M2
354
Programming Q parameters | Programming examples
Center in X axis
Center in Y axis
Center in Z axis
Starting angle in space (Z/X plane)
End angle in space (Z/X plane)
Cylinder radius
Length of the cylinder
Rotational position in the X/Y plane
Allowance for cylinder radius
Feed rate for plunging
Feed rate for milling
Number of cuts
Workpiece blank definition
Tool call
Retract the tool
Call machining operation
Reset allowance
Call machining operation
Retract the tool, end program
HEIDENHAIN | TNC 620 | Klartext Programming User's Manual | 01/2022