Hello,

I seem to be having an issue with mach3 and I am convinced it is a software config issue. My Mach3 does not like running arcs using I and J (inc. programming), it will not draw a proper arc in the display and when running on the mill it will feed around a lot quicker than programmed. I am sure it is programmed correctly because I tried other variations and Mach3 did not accept them at all. The way it does work is if I just replace the I and J with the "R" command, it then does a proper arc at the programmed feed rate. This convinces me it is software (or incorrect programming) not a machine issue. Does anyone have any ideas?

The incremental arc option is checked in general config.

If you copy and paste the prog into mach3 you can see what i mean about the incorrect arc,

it is not starting or ending tangentially.....

Here is the program that is not working:-

G00 G17 G20 G40 G49 G80 G90

T4 M06 (3/16 slotdrill)

G00 G54 X0. Y.2 M03

G00 G43 H4 Z2.0

Z.1

G01 Z0. F5

z-.02

y0. F15.

X1.165 Y0.

G02 X1.44 Y-.275 I-.275 J0.

G01 Y-1.22

G00 Z.25

X0 Y.2

G01 Z0. F5

z-.02

y0. F15.

X-1.165

G03 X-1.44 Y-.275 I.275 J0.

G01 Y-1.22

G00 Z.25

X0 Y.2

G01 Z0. F5

z-.039

y0. F15.

X1.165

G02 X1.44 Y-.275 I-.275 J0.

G01 Y-1.22

G00 Z.25

X0 Y.2

G01 Z0. F5

z-.039

y0. F15.

X-1.165

G03 X-1.44 Y-.275 I.275 J0.

G01 Y-1.22

G00 Z.25

X0 Y.2

G90 G00 Z2.00

M05

M30

Here is the program that is working:-

G00 G17 G20 G40 G49 G80 G90

T4 M06 (3/16 slotdrill)

G00 G54 X0. Y.2 M03

G00 G43 H4 Z2.0

Z.1

G01 Z0. F5

z-.02

y0. F15.

X1.165 Y0.

G02 X1.44 Y-.275 R.275

G01 Y-1.22

G00 Z.25

X0 Y.2

G01 Z0. F5

z-.02

y0. F15.

X-1.165

G03 X-1.44 Y-.275 R.275

G01 Y-1.22

G00 Z.25

X0 Y.2

G01 Z0. F5

z-.039

y0. F15.

X1.165

G02 X1.44 Y-.275 R.275

G01 Y-1.22

G00 Z.25

X0 Y.2

G01 Z0. F5

z-.039

y0. F15.

X-1.165

G03 X-1.44 Y-.275 R.275

G01 Y-1.22

G00 Z.25

X0 Y.2

G90 G00 Z2.00

M05

M30

Thanks,

Richard.