Machsupport Forum

Support => Forum suggestions and report forum problems. => Topic started by: gael on July 03, 2007, 12:24:27 PM

Title: Absolute coordinates in G2/G3 circular interpolation
Post by: gael on July 03, 2007, 12:24:27 PM

Dear all,

My problem is the following:

It appears that when passing a circular interpolation in the format "G2 X Y I J", the interpolation center (I J) is always interpreted by mach3 as a relative coordinate and never as a an absolute coordinate. Even with the proper G90, X and Y are correctly interpreted as absolute coordinates while I and J are treated as relative coordinates.

What can be done to make Mach3 G-Code interpretation to fit with the norme?

Best regards,

Gaël

Title: Re: Absolute coordinates in G2/G3 circular interpolation
Post by: Graham Waterworth on July 03, 2007, 03:43:23 PM

At the start of your gcode, on a line of its own enter G90.1 this will tell mach that arc I & J are to be absolute.

Graham.

Title: Re: Absolute coordinates in G2/G3 circular interpolation
Post by: gael on July 03, 2007, 04:50:25 PM

Graham,

That's great!!! It works!

Tell me : Have I missed something in Mach3's documentation? Is this "trick" written somewhere?

Best regards,

Gaël

Title: Re: Absolute coordinates in G2/G3 circular interpolation
Post by: Graham Waterworth on July 03, 2007, 06:13:58 PM

Its in the documents somewhere but I forget where.

Graham.

Title: Re: Absolute coordinates in G2/G3 circular interpolation
Post by: ger21 on July 04, 2007, 10:23:30 AM

You can also change the default IJ mode in the general config screen.

Title: Re: Absolute coordinates in G2/G3 circular interpolation
Post by: gael on July 04, 2007, 03:19:54 PM

OK.

I hadn't seen this setting.

Quote from: ger21 on July 04, 2007, 10:23:30 AM

You can also change the default IJ mode in the general config screen.