Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set User Manual
Page 378
Axis Motion
Chapter 12
12-6
The format for circular interpolation in the ZX plane is as follows:
G02
X__ Z__
I__ K__
F__ ;
G03
R__
Where :
Is :
X, Z
in absolute (G90) mode, these are the work coordinate values of the end point.
In incremental (G91) mode these are the positions of the end point in reference
to the start point.
I, K
these determine the position of the arc center. They are the incremental distance
on each axis from the start point of the arc to the center point. These values are
always incremental, regardless of the established positioning mode (absolute or
incremental). I is parallel to X axis, and K is parallel to Z axis; though this can be
configured in AMP. These are not necessary if programming the R parameter.
R
rather than defining a center with I, K, the option exists to define an arc radius
using R. The sign of this entry determines the arc center point location. If R is
programmed as a positive value, the center point is located such that an arc less
than 180 degrees is generated. If R is programmed as a negative value, the
center point is located such that an arc greater than 180 degrees is generated.
Refer to Figure 12.5 for an example.
F
another option is to enter a feedrate tangential to the arc. If omitted the control
uses the feedrate active prior to this block
Example 12.4
Circular Interpolation G18 (ZX Plane)
Absolute Mode
Incremental Mode
G08G02;
X50.Z45.I15.K0F.1;
G08G02;
X30.Z-15.I15.K0F.1;
or
or
G08G02;
X50.Z45.R15.F.1;
G08G02;
X30.Z-15.R15.F.1;
In Example 12.4, you can omit the K--word. If you omit I or K from the
circular block, the control assumes that they have a value of 0 unless an
R--word is present.