Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 621)

Turning Operations
Chapter 18
18-5
Figure 18.3
G20 Taper Grinding Cycle
Grinding/Dressing feed
Rapid feed
I
Z
X Grinding
wheel
12062-I
After the control executes the G20 block, it re-executes the cycle for any
following block that command axis motion (until the cycle is canceled).
The values of the axis words in the following block replace the values of
the parameters specified in the original G20 block.
Figure 18.4 applies only if you program X and Z as incremental values. If
you program X and Z as absolute values, the depth of taper I is added or
subtracted (depending on its sign) to the absolute X-axis position.
Figure 18.4
Effect of Positive and Negative Parameters in a G20 Block
Grind/Dress feed
Rapid feed
I
Z
When X is positive and Z and I are negative
G20 X+__ Z-__ I-__ ;
I
Note : | I | ≤ |
X |
Z
X
Z
X
I
I
Z
X
When X and I are positive and Z is negative
G20 X+__ Z-__ I+__ ;
When X,Z, and I are negative
G20 X-__ Z-__ I-__ ;
When X and Z are negative
and I is positive
G20 X-__ Z-__ I+__ ;
X
Grinding
wheel
Grinding
wheel
12063-I