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G-Code, CAD, and CAM discussions / Strange error with Mach 3, Ok in NCPlot

« on: January 06, 2011, 08:15:07 AM »

This code works in NCPlot, but Mach 3 tells me the radius at the end point is not the same as at the start.  I have the IJ Mode set to INC in config.

G20 (set the units to inches)
G17 (make arcs within the XY plane)
F10 (set feed rate in inches per minute)
G10 L1 P1 R.125 (set tool 1 radius to .125)
G41 D1 (cutter radius compensation tool 1 to the left of cut)
G91
G0 Z1
G0 X1
G0 Z-1
G0 X-1
G90
(start at 0,0,0)
G1 X2 (cut lower body)
G2 X2.125 Y-.125 J-.125 (cut CCW arc to  x2.125 Y-.125)  <this gives an error.
G3 X2.625 Y-.125 I.25  (cut CW arc to X2.625)
G1 Y.75 (cut beater end)
G3 X2.125 Y.75 I-.250 (cut CW arc to X2.125 Y.75)
G2 X2 Y.625 I-.125 (Cut CCW arc to X2 Y.625)

G1 X0
G1 Y0

M30

Can anyone see my error??