
Turning Operations
Chapter 18
18-5
Figure 18.3
G20 Taper Grinding Cycle
Grinding/Dressingfeed
Rapid feed
I
Z
X
Grinding
wheel
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After the control executes the G20 block, it re-executes the cycle for any
following block that command axis motion (until the cycle is cancel ed).
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/Dressfeed
Rapid feed
I
Z
When Xispositive and Z and I are negative
G20X+__Z-__I-__;
I
Note:
| I | ≤ | X|
Z
X
Z
X
I
I
Z
X
When XandIare positiveand Z isnegative
G20X+__Z-__I+__;
When X,Z,and I arenegative
G20X-__Z-__I-__;
When XandZ are negative
and Iis positive
G20X-__Z-__I+__;
X
Grinding
wheel
Grinding
wheel
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