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