Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario Pagina 378

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AxisMotion
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 arethework coordinate valuesof theendpoint.
Inincremental(G91) mode theseare the positionsoftheend point in reference
to the start point.
I, K thesedeterminethepositionofthe arccenter. They are the incrementaldistance
on eachaxisfromthe startpoint of thearc tothecenterpoint. Thesevaluesare
alwaysincremental,regardlessof theestablishedpositioning mode (absoluteor
incremental). Iis parallel toXaxis,andKis parallel to Z axis;though thiscan be
configured in AMP. T hese are notnecessaryif programmingthe R parameter.
R rather than defininga centerwithI,K,theoption existstodefine an arcradius
usingR. The sign of thisentrydeterminesthe arccenterpointlocation. IfR is
programmed as a positivevalue, thecenterpointis locatedsuch thatan arc less
than180 degrees is generated. IfR is programmedas a negativevalue, the
centerpointislocated such thatan arc greaterthan 180 degreesisgenerated.
Referto Figure 12.5foran example.
F another option is toenter a feedrate tangential tothe arc. Ifomittedthe control
usesthe feedrate activepriorto thisblock
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.
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