5 p ath cont ours — p olar coor dinat e s – HEIDENHAIN TNC 426 (280 476) User Manual
Page 181
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6 Programming: Programming Contours
6.5 P
ath Cont
ours
—
P
olar Coor
dinat
e
s
Shape of the helix
The table below illustrates in which way the shape of the helix is
determined by the work direction, direction of rotation and radius
compensation.
Programming a helix
7
7
7
7
Polar coordinates angle:
Enter the total angle of
tool traverse along the helix in incremental
dimensions. After entering the angle, identify the
tool axis with an axis selection key.
7
7
7
7
Coordinate
: Enter the coordinate for the height of the
helix in incremental dimensions.
7
7
7
7
Direction of rotation DR
Clockwise helix: DR–
Counterclockwise helix: DR+
7
7
7
7
Radius compensation RL/RR/R0
Enter the radius compensation according to the table
above.
Example NC blocks: Thread M6 x 1 mm with 5 revolutions
Internal thread
Work
direction
Direction
Radius
comp.
Right-handed
Left-handed
Z+
Z+
DR+
DR–
RL
RR
Right-handed
Left-handed
Z–
Z–
DR
DR+
RR
RL
External thread
Right-handed
Left-handed
Z+
Z+
DR+
DR–
RR
RL
Right-handed
Left-handed
Z–
Z–
DR
DR+
RL
RR
Always enter the same algebraic sign for the direction of
rotation DR and the incremental total angle IPA. The tool
may otherwise move in a wrong path and damage the
contour.
For the total angle IPA, you can enter a value from
–5400° to +5400°. If the thread has more than 15
revolutions, program the helix in a program section repeat
(see “Program Section Repeats,” page 344)
12 CC X+40 Y+25
13 L Z+0 F100 M3
14 LP PR+3 PA+270 RL F50
15 CP IPA-1800 IZ+5 DR-
Y
X
Z
25
40
5
270°
R3
CC