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General Mach Discussion / newbie problem cutting circle

« on: October 25, 2011, 06:50:39 AM »

I'm new to this, but tried to use the wizard for cut circle.
 When I try diameter 30 I get 56, on the display while cutting the numbers for X goes from  -12,8 to +38,  and for Y from -25,7 to +25,7.
This is quite frustrating, do anyone have an idea what I'm doing wrong?


The G code is :
F400
G00 Z10
G00 X12.9 Y0
G00 Z1
G01 Z-0.5 F50
G02 X12.9 Y0 I-12.9 J0 F400
G01 Z-1 F50
G02 X12.9 Y0 I-12.9 J0 F400
G01 Z-1.5 F50
G02 X12.9 Y0 I-12.9 J0 F400
G01 Z-2 F50
G02 X12.9 Y0 I-12.9 J0 F400
G01 Z-2.5 F50
G02 X12.9 Y0 I-12.9 J0 F400
G01 Z-2.9 F50
G02 X12.9 Y0 I-12.9 J0 F400
G00 Z10
G00 X13 Y0
G01 Z-2 F400
G01 Z-3 F50
G03 X13 Y0 I-13 J0 F400
G00 Z10
G00 X0 Y0
M30