Re: Can You Machine NURBS?

Hi Dave,

thanks for the code sample! Some things that I don't recognize, the
K's, and the G6.2, which I take to be for NURBS.

My Vector CAD/CAM doesn't output NURBS code, although I'm wondering if
the new (NURBS?) Vector CAD/CAM might output them. That's OK, my
controller can't cut them!

Alan KM6VV


"pressgocnc " wrote:

>
> > While I've heard of NURBS, I hadn't heard of "NURBS G-code". What
> are
> > the specialized Gcodes involved? do you have a sample and/or a
> > reference? I'd thought it might be neat to do an "ellipse Gcode",
> but
> > then I don't cut many ellipses (or parabolas!)!
> >
> > Alan KM6VV
>
> Alan,
> I have never cut metal using a Nurbs toolpath, but I have produced a
> sample program that the Dolphin 3DCAM system outputs using the only
> nurbs post processor that I currently have for it. Here is a short
> section of it:
> %
> :PG ENG SECOND CORE
> G28G91X0Y0Z0
> (Plane-Finishing)
> T01 M06
> G43 H01 Z0. S11059 M03
> G00 X0.023 Y-59.494 Z15.316
> Z-70.469
> G01 Z-71.469 F600
> G05P10000
> G6.2 P3 K0 X0.023 Y-59.494 Z-71.469 F1200
> K0 Z-71.315
> K0 Z-71.161
> K1
> K1 Z-71.16
> K2 Y0.017 Z11568.072 R0.005
> K2 Y59.494 Z-71.16 R1
> K3
> K3 X0.023 Y59.494 Z-71.161
> K3
> K3
> K3
> G01 X1.023 F600
> G6.2 K0 X1.023 Y59.494 Z-71.161 F1200
> K0
> K0
> K1 Y0.004 Z11728.474 R0.005
> K1 Y-59.494 Z-71.161 R1
> K2
> K2
> K3 Z-71.315
> K3 X1.023 Y-59.494 Z-71.47
> K3
> K3
> K3
> G01 X1.194 Z-71.459 F600
> X1.708 Z-71.451
> X2.023 Z-71.45
> Z-71.47
> G6.2 K0 X2.023 Y-59.494 Z-71.47 F1200
> K0 Z-71.316
> K0 Z-71.162
> I wish I could give you some more info on what it all means, but I
> cannot.
>
> Dave Pearson