Re: [CAD_CAM_EDM_DRO] XY point list for spiral to DXF?

rutexusa wrote:

>Gentlemen,
>
>I tried to make a spiral within Turbocad without success.
>
>So...I plan to write a short basic program to generate an archimedean
>spiral with particular dimensions that I want to have waterjet cut out
>of sheet metal. Then I will have a list of coordinates. I want to
>inport this list to a cadd program to do a little more editing and
>which will give me a dxf file ready to cut for the waterjet company.
>
>Does anyone know of a program/way which will allow me to take a simple
>list of coordinates and produce a dxf file for input to a cadd
>program?
>
>

Why don't you go STRAIGHT to G-code, and skip the *^% DXF?
For the most basic sort of approach, take a look at my "makebore"
program, the first one at http://jelinux.pico-systems.com/gcode.html
This makes an expanding "spiral" out of 90 degree arc segments.
The same scheme could be used to make the spiral in, say, 15 degree
segments that would have an imperceptible discontinuity at the joints
between the segments. The source code is in c compatible with both
Microsoft and Linux, but the basic algorithm should be pretty readable.

>Is there a better way of doing this without buying another expensive
>cadd program?
>
>

Yes. G-code really is simple, and a lot easier for humans to read and edit
than dxf.

Jon