Re: XY point list for spiral to DXF?

Victor,

My son has Turbo Pro ver 11.1. I used to know how to run it, but it
has been too long. I sat down and clicked on spirals, and I couldn't
figure how to make it do anything. It says it's for 3d spirals. The
manual was no help to me. Could I chat with you over the phone about
it? Maybe we can get it done in Turbo. For the most part we only
use Turbo in 2d. I didn't have any objects to work with. I just
need a simple spiral, starting with a 6" hole in the middle and
ending up with a "diameter" of 20". It would be like taking a rope
and coiling it up on a flat surface with each ring of the
coil "parallel" to the ring inside it. If turbo can do it, I'd like
to use it, as this design may need to change. It is for a prototype.

If you could give me your phone #, I'll be happy to call you.

Thanks for your help.

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
> fax 406.264.5830
>
> -----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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