M-Series Operator’s Manual 4/9/15
METHOD 2: USING FINAL POINT AND PARAMETERS I, J, K
Another way to specify a helical or circular operation is using the parameters I, J, K instead of the radius R. The
parameters I, J, and K are the incremental distances from the start point to the center of the arc. For absolute
positioning on I, J, and K, parameter 2 bit 0 will need set. See the parameter section in Chapter 14.
I = X center - X start (valid for G17 & G18)
J = Y center - Y start (valid for G17 & G19)
K = Z center - Z start (valid for G18 & G19)
Examples:
Circular motion (See graph in method 1, example 2)
G17 G90 F25 ; selects XY plane and absolute positioning
G00 X1.0 Y1.0 Z0 ; rapid to start position X1, Y1, Z0
G02 X2 Y2 Z0 J1 ; arc to X2 Y2 Z0 with radius of 1
Helical motion
G17 G90 F30 ; select XY plane and absolute positioning
G00 X3.0 Y2.0 Z1.0 ; rapid to start position X3, Y2, Z1
G02 X2.0 Y1.0 I-1.0 J0.0 Z0.0 ; CW XY arc from X3, Y2 to X2, Y1.
; Center at X2, Y2
; Helical Z move from 1 to 0
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