Chapter 7
104
UM10349_PCNC1100_Manual_0916A
Programming
Here is an example of a center format command to mill an arc in incremental arc distance mode
(G91.1):
G17 G02 X1.0 Y1.6 I0.3 J0.4 Z0.9
That means to make a clockwise (as viewed from the posive Z-axis) circular or helical arc whose
axis is parallel to the Z-axis, ending where X=1.0, Y=1.6 and Z=0.9, with its center oset in the X
direcon by 0.3 units from the current X locaon and oset in the Y direcon by 0.4 units from
the current Y locaon. If the current locaon has X=0.7, Y=0.7 at the outset, the center is at X=1.0,
Y=1.1. If the starng value of Z is 0.9, this is a circular arc; otherwise it is a helical arc. The radius of
this arc would be 0.5.
In the center format, the radius of the arc is not specied, but it may be found easily as the distance
from the center of the circle to either the current point or the end point of the arc.
(Sample Program G02EX3:)
(Workpiece Size: X4, Y3, Z1)
(Tool: Tool #2, 1/4” Slot Drill)
(Tool Start Position: X0, Y0, Z1)
N2 G90 G80 G40 G54 G20 G17 G94 G64 (SAFETY BLOCK)
N5 G90 G20
N10 M06 T2 G43 H2
N15 M03 S1200
N20 G00 X1 Y1
N25 Z0.1
N30 G01 Z-0.1 F5
N35 G02 X2 Y2 I1 J0 F20 (ARC FEED CW, RADIUS I1,J0 AT 20 IPM)
N40 G01 X3.5
N45 G02 X3 Y0.5 R2 (ARC FEED CW, RADIUS 2)
N50 X1 Y1 R2 (ARC FEED CW, RADIUS 2)
N55 G00 Z0.1
N60 X2 Y1.5
N65 G01 Z-0.25
N70 G02 X2 Y1.5 I0.25 J-0.25 (FULL CIRCLE ARC FEED MOVE CW)
N75 G00 Z1
N80 X0 Y0
N85 M05
N90 M30
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