Re: [CAD_CAM_EDM_DRO] Re: Beginning CAD question

Thanks Fred,

I just created a sine wave pattern using excel and formatted it just like
your example and then paste-specialed the points into VectorCAD. It worked
beautifully!!!!! Thank you.

I experimented with a few spacings between the points and found that the
curve is nearly perfect if I use 360 points to define the full 3 periods.
the spline function then creates a nearly perfect curve (to the resolution
of the monitor at least). What effect on the G-code output will the number
of points that the spline is figured from have? Is there a best number to
use, or does it not matter. Also what effect does the absolute error
setting have? I set it to zero.

Too bad my machine is not up and running to test this out.

Thanks for your help, do you mind if I ask you a few more questions in the
coming days and weeks.

Dan.

----- Original Message -----
From: "Fred Smith" <imserv@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, September 23, 2001 8:51 PM
Subject: [CAD_CAM_EDM_DRO] Re: Beginning CAD question


> --- In CAD_CAM_EDM_DRO@y..., "Dan Statman" <dan.statman@r...> wrote:
> >So if I can make a drawing that starts at y=0 and ends at y=3.600 I
> > should have the right size for my application.
> >
> > I would like to draw a picture of a Sine wave that traverses three
> complete
> > periods (from 0 to 3.600") with an amplitude of 0.250". This
> should be easy
> > if you know how to use the program, but I don't so could somebody
> tell me
> > how to do it??? Once I learn how to do this one, I should be able
> to modify
> > the process to plot any function I may want.
> >
>
> In order to cut this on your mill, you will need to convert the sine
> wave to a series of short lines that approximate the contour. To do
> this in Vector Cad, we use a spread sheet program, and create the X &
> Y values every so often (say every 60 degrees), and maybe have an
> input for amplitude too in this case so you can control the width of
> the sine wave relative to the ring width. The points are then
> imported with the plc function and a spline is plotted through them.
> The points are formated as:
>
> point(x,y,z);
>
> A sample of a similar process is shown at the page on the solar
> cooker:
>
> http://www.vectorcam.com/cooker
>
> You can use the Vector demo from our web site to experiment. It will
> either save the file as a DXF or output G-code directly.
>
> Hope that helps you a little.
>
> Best Regards, Fred Smith- IMService
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