HEIDENHAIN TNC 426, User Manual

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328 8 Programming: Cycles
8.8
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SCALING FACTOR (Cycle 11)
The TNC can increase or reduce the size of contours within a program,
enabling you to program shrinkage and oversize allowances.
Effect
The SCALING FACTOR becomes effective as soon as it is defined in
the program. It is also effective in the Positioning with MDI mode of
operation. The active scaling factor is shown in the additional status
display.
Scaling factor
n
in the working plane, or on all three coordinate axes at the same
time (depending on machine parameter 7410)
n
to the dimensions in cycles
n
to the parallel axes U,V,W
Prerequisite
It is advisable to set the datum to an edge or a corner of the contour
before enlarging or reducing the contour.
U
Scaling factor ?: Enter the scaling factor SCL. The
TNC multiplies the coordinates and radii by the SCL
factor (as described under “Effect” above)
Enlargement: SCL greater than 1 (up to 99.999 999)
Reduction: SCL less than 1 (down to 0.000 001)
Cancellation
Program the SCALING FACTOR cycle once again with a scaling factor
of 1.
Example: NC blocks
11 CALL LBL1
12 CYCL DEF 7.0 DATUM SHIFT
13 CYCL DEF 7.1 X+60
14 CYCL DEF 7.2 Y+40
15 CYCL DEF 11.0 SCALING
16 CYCL DEF 11.1 SCL 0.75
17 CALL LBL1
Z
Z
X
X
Y
Y