HEIDENHAIN iTNC 530 (340 422) ISO programming - Manual (Page 388)

388 8 Programming: Cycles
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SCALING FACTOR (Cycle G72)
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.
The scaling factor has an effect on
n the working plane, or on all three coordinate axes at the same time
(depending on MP7410)
n the dimensions in cycles
n
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 U U U Scaling factor? : Enter the scaling factor F. The TNC
multiplies the coordinates and radii by the F factor (as
described under “Effect” above).
Enlargement: F greater than 1 (up to 99.999 999)
Reduction: F less than 1 (down to 0.000 001)
Cancellation
Program the SCALING FACTOR cycle once again with a scaling factor
of 1 for the same axis.
Example: NC blocks
N72 G72 F0.750000 *
Z
Z
X
X
Y
Y