Re: XY point list for spiral to DXF?

Chuck,

Thanks for your help. That file looks like what I'm trying to
achieve, but I will need it in DXF format to make it part of a
drawing that I can send to the company that does our water-jet work.

Thanks again.

Tom Eldredge

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Victor A. Estes"
<emc3zach@h...> wrote:

>
> Tom,
>
> What ver of TurboCad do you have? TurboCad Pro Ver 11.1 does

spirals

> and threaded bolts as a utility added to the program. If you want

I could

> generate the spiral for you, save it as a dxf file, then you could

import it

> into your version of TurboCad. The dxf file could also be imported

into a

> g-code generator to automatically get the code you want.
>
> You can also find AutoLISP (.lsp) files for AutoCad on the

internet that

> does Spirals and Helix's. I have those as well if interested.
>
> Victor A.
> ----- Original Message -----
> From: "Chuck Merja" <chuckm@3...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Thursday, January 05, 2006 8:57 AM
> Subject: RE: [CAD_CAM_EDM_DRO] XY point list for spiral to DXF?
>
>
> Oh that would be fun - Spirals are generally defined in polar

coordinates.

> I'd create a spreadsheet that automated the spiral polar

coordinates, and

> then calculate the rectangular coordinates therefrom. I think

Archimedes

> grew his spiral linearly, but there are several others...
>
> I'd be willing to help with the SS if you like.
>
> I grabbed the following from
> http://www.bookrags.com/sciences/mathematics/spiral-wom.html
>
> Spirals are classified by the mathematical relationship between the

length r

> of the radius vector, and the vector angle q, which is made with the
> positive x axis. Some of the most common include the spiral of

Archimedes,

> the logarithmic spiral, parabolic spiral, and the hyperbolic spiral.
>
> The simplest of all spirals was discovered by the ancient Greek
> mathematician Archimedes of Syracuse (287-212 BC). The spiral of

Archimedes

> conforms to the equation r = a, where r and represent the polar

coordinates

> of the point plotted as the length of the radius a, uniformly

changes. In

> this case, r is proportional to .
>
> The logarithmic, or equiangular spiral was first suggested by Rene

Descartes

> (1596-1650) in 1638. Another mathematician, Jakob Bernoulli (1654-

1705), who

> made important contributions to the subject of probability, is also

credited

> with describing significant aspects of this spiral. A logarithmic

spiral is

> defined by the equation r = e a, where e is the natural logarithmic
> constant, r and represent the polar coordinates, and a is the

length of the

> changing radius. These spirals are similar to a circle because they

cross

> their radii at a constant angle. However, unlike a circle, the

angle at

> which its points cross its radii is not a right angle. Also, these

spirals

> are different from a circle in that the length of the radii

increases, while

> in a circle, the length of the radius is constant. Examples of the
> logarithmic spiral are found throughout nature. The shell of a

Nautilus and

> the seed patterns of sunflower seeds are both in the shape of a

logarithmic

> spiral.
>
> A parabolic spiral can be represented by the mathematical equation

r2 = a2.

> This spiral discovered by Bonaventura Cavalieri (1598-1647) creates

a curve

> commonly known as a parabola. Another spiral, the hyperbolic spiral,
> conforms to the equation r = a/.
>
> Another type of curve similar to a spiral is a helix. A helix is

like a

> spiral in that it is a curve made by rotating around a point at an
> ever-increasing distance. However, unlike the two dimensional plane

curves

> of a spiral, a helix is a three dimensional space curve which lies

on the

> surface of a cylinder. Its points are such that it makes a constant

angle

> with the cross sections of the cylinder. An example of this curve

is the

> threads of a bolt.
>
> 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/
> lat/long 47.52383 -111.67912
> 211 Adams Rd
> Sun River, MT 59483
> vx 406.264.5955
> cell 406.799.5955
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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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> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to

reach it if

> you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to

be a

> sister site to the CCED group, as many of the same members are

there, for OT

> subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING

THEM.

> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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