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General Mach Discussion / oval circle

« on: December 17, 2016, 01:35:56 PM »

Hello,  New to this forum and the world of CNC and Mach3.

I'm trying to gut a test circle of 49mm but it turns out slightly oval,  to eliminate as much as possible i've made the circle in the mach3 wizard.

when i measure the circle it is only 48.5mm on the Y and X axis. but when i meassure on 45 degress to x or y it is the correct Dimension.

What am i missing or where should i look to correct this?

here is the g-code

(Code by Newfangled Wizard, 17.12.2016)
(Version 2.86)
(Program Posted for Wood )
G0 G49 G40.1 G17
G80 G50 G90 G98 
G21 (mm)
(***** Circular Groove/Cutout *****)
M6 T7
M03 S24000
M9
G00G43 H7 Z1
G00 X20 Y-2.25
G41 P1.5
G01 X22.25 F1000
G03 X24.5 Y0 R2.25 F1000
G01 Z-0.5 F500
G03 X-24.5 Y0 R24.5
X24.5 Y0 R24.5
G00 Z1
G03 X22.25 Y2.25 R2.25
G40
G00 X20 Y2.25
M5 M9
M30