HEIDENHAIN TNC 426, TNC 430 391
10.11 Programming Examples
Example: Ellipse
Program sequence
n The contour of the ellipse is approximated by
many short lines (defined in Q7). The more
calculating steps you define for the lines, the
smoother the curve becomes.
n The machining direction can be altered by
changing the entries for the starting and end
angles in the plane:
Clockwise machining direction:
starting angle > end angle
Counterclockwise machining direction:
starting angle < end angle
n The tool radius is not taken into account.
0 BEGIN PGM ELLIPSE MM
1 FN 0: Q1 = +50
Center in X axis
2 FN 0: Q2 = +50
Center in Y axis
3 FN 0: Q3 = +50
Semiaxis in X
4 FN 0: Q4 = +30
Semiaxis in Y
5 FN 0: Q5 = +0
Starting angle in the plane
6 FN 0: Q6 = +360
End angle in the plane
7 FN 0: Q7 = +40
Number of calculating steps
8 FN 0: Q8 = +0
Rotational position of the ellipse
9 FN 0: Q9 = +5
Milling depth
10 FN 0: Q10 = +100
Feed rate for plunging
11 FN 0: Q11 = +350
Feed rate for milling
12 FN 0: Q12 = +2
Setup clearance for pre-positioning
13 BLK FORM 0.1 Z X+0 Y+0 Z-20
Define the workpiece blank
14 BLK FORM 0.2 X+100 Y+100 Z+0
15 TOOL DEF 1 L+0 R+2.5
Define the tool
16 TOOL CALL 1 Z S4000
Tool call
17 L Z+250 R0 F MAX
Retract the tool
18 CALL LBL 10
Call machining operation
19 L Z+100 R0 F MAX M2
Retract in the tool axis, end program
X
Y
50
50
30
50
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