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

Here's little ss I tossed together to create polar (linear growth in radius)
cords and then create rectangular. Note the growth in theta is in radians.
Most spreadsheets operate that way. If you prefer degrees you gotta do that
180 deg = pi radian thing.

start theta 0
grow theta 0.5 radians
start radius 0
grow radius 0.5 in


theta radius X Y
0 0 0.000000 0.000000
0.5 0.5 0.438791 0.239713
1 1 0.540302 0.841471
1.5 1.5 0.106106 1.496242
2 2 -0.832294 1.818595
2.5 2.5 -2.002859 1.496180
3 3 -2.969977 0.423360
3.5 3.5 -3.277598 -1.227741
4 4 -2.614574 -3.027210
4.5 4.5 -0.948581 -4.398886
5 5 1.418311 -4.794621
5.5 5.5 3.897684 -3.880472
6 6 5.761022 -1.676493
6.5 6.5 6.347820 1.398280
7 7 5.277316 4.598906
7.5 7.5 2.599765 7.035000
8 8 -1.164000 7.914866
8.5 8.5 -5.117101 6.787140
9 9 -8.200172 3.709066
9.5 9.5 -9.473135 -0.713936
10 10 -8.390715 -5.440211

Chuck Merja
www.3rivers.net/~chuckm/index.htm

Lemelson-MIT Inventeams - http://web.mit.edu/invent/n-main.html

US FIRST Robotics - http://www.usfirst.org/
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Sun River, MT 59483
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-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of rutexusa
Sent: Thursday, January 05, 2006 7:35 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] XY point list for spiral to DXF?

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?

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

Tom Eldredge






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