Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 367)

Coordinate Control
Chapter 13
13-15
Figure 13.8
Results of Example 13.5
0 1 2 3 4 5 6 7 8 9 10
10
9
8
7
6
5
4
3
2
1
Scaled
Original
X
Y
When incremental mode (G91) is active, the control ignores the
programmed centers of scaling. The control performs scaling on the axes
programmed in the G14.1 block, but the scaling moves are referenced from
their current axis positions not the programmed center of scaling or the
active coordinate zero point.
Important: The center of scaling may be specified in either incremental or
absolute mode (G90/G91) in the G14.1 block. But, unlike other features in
the control, both modes may not be programmed in the same block.
Example 13.6
Scaling with Incremental Mode Active
Program block Comment
N01 G91; incremental mode
N02 G14.1 X6. Y6. P0.5; scale X and Y by .5 (X, Y values ignored)
N03 G91 X2 Y2 F100; axis positioning move
N04 X8.; feedrate move X
N05 Y8.; feedrate move Y
N06 X-8.; feedrate move X
N07 Y-8.; feedrate move Y
N08 G14; cancel scaling