Re: [CAD_CAM_EDM_DRO] G-Code Arc drawing question

Hi Dan:
In the CAD CAM programs that I have used, you can follow a curve in
little bitty linear moves if it has been created as a spline.
Either a NURBS spline or a Bezier spline will work equally well.
The toolpath will be all G01 moves.
The systems I have used allow you to specify the maximum deviation of the
line moves from the spline that they are approximating.
I think Autocad can make something called "polylines" which probably comes
to about the same thing in the end, but the geometry you get on the screen
is actually a bunch of little lines.
Beware trying to dump this geometry into another CAD or CAM program; often
it will not chain together properly, and you can waste hours fooling about
with it.
Cheers

Marcus

-----Original Message-----
From: Dan Statman <dan.statman@...>
To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
Date: Thursday, November 15, 2001 9:01 AM
Subject: [CAD_CAM_EDM_DRO] G-Code Arc drawing question

>
>When I try out all of the demo versions of the CAD programs and I draw
>circles and curves, it always converts them to the G-Code for cutting arcs
>(makes sense). Is there a way to tell the Cad program to break the arcs up
>into tiny line segments so that I get the G01 output (many lines) instead

of

>G03 (or whatever the arc code is)? The arc cutting does not work when the
>Y-axis is scaled from 0 to 360 degrees and the x-axis of the part is scaled
>from 0 to 0.100"
>