How to Reduce "digitalization" Effect on Arcs Generated with G3 Commands?

Problems and questions
1

Hi,

I run Sheetcam version 7.0.21 on my Plasma Cutter.

Everything works well, except that I observe that arcs generated with G3 commands produce “digitalized” edges. Straight lines on X or Y are quite perfect and clean however. Of course, interpolated arcs cut with G3 commands are composed of small X and Y steps that will produce visible steps on the edge of the cut, but what is the values of these steps ?

  • Q1 : Is it possible to fine-tune this effect in the Sheetcam application ?

  • Q2 : Is it possible to force the application to use G1 commands instead of G3 ?

Thanks for any help

2

actually, the problem you describe would be caused by G1 stmts, and not by G2/G3.
Yes, sheetcam can use G1 stmts for arcs, it requires a simple pp change in OnArc(), add “post.ArcAsMoves(0.2)”, where 0.2 = length of arc chord in mm. You can use any value you like.

this can be caused for several reasons. 1) The dxf arcs may be chords/segments that are too course, or 2) sheetcam may be parsing the dxf arcs into course chords, or 3) your controller may be parsing G2/G3 arcs into course chords.

For item 2), See sheetcam setting Options / ‘Application options’ / ‘Drawing import’ / Arc fitting tolerance.

3

Thank you for your useful feedback bLouChip !