Hi Guys,

I just noticed that when using R(radius) from Fusion360 post processor the circles in Mach3 are not round. I am cutting a 10mm outer diameter with 3mm end mill, the zero is in the center. The GCode is 100% correct, so it is not an issue from Fusion360.

So i took a closer look at the generated path in Mach3 to find out the following:

On the Y axis Top and Bottom points on the circle are correct at 6.500mm and -6.500, but on the X axis left and right are -6.420 and +6.420. it is basically generating an elipse with 6.5mm and 6.42mm radii.

When using I J all works fine. So i was wondering if anyone else can reproduce this problem. It costed me a couple of hours to figure out that the issue is not with the CNC machine...

Thanks

Not working:

G3 X-6.456 Y0.748 R0.449

G2 X6.456 Y-0.748 R6.5

X-6.456 Y0.748 R6.5

G0 Z15.

Working fine:

G3 X-6.456 Y0.748 I-0.163 J0.418

G2 X6.456 Y-0.748 I6.456 J-0.748

X-6.456 Y0.748 I-6.456 J0.748

G0 Z15.