Re: [CAD_CAM_EDM_DRO] G-Code Arc drawing question

Sounds like the Arc Vector command is EXACTLY what I am looking for. Is
this a standard feature on many (any?) CAD/CAM programs?

How much is Dolphin? Couldn't find a price on their website.

Dan.

----- Original Message -----
From: "Michael Milligan" <mmmilligan@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, November 15, 2001 4:05 PM
Subject: RE: [CAD_CAM_EDM_DRO] G-Code Arc drawing question


> Dan
> The post processor system within Dolphin CAD/CAM has
> an ARC command :-
>
> ARC QUADRANT - This quadrant splits arcs so that no
> arc is output greater than 90 deg or
> that crosses a quadrant boundary.
>
>
> ARC VECTOR - This outputs a G03/G02 as a series of
> short G01 vector moves. The length of
> the Vector is controlled by a user set
> parameter called 'ARC TOLERANCE'.
> The Arc Tolerance is in fact the Cusp
> Height of the Arc Chord formed by the
> Vector. i.e. The smaller the Arc Tolerance
> then the smaller the resultant vector
> length and the smoother the final tool path.
>
>
> Hope that makes sense to you.
>
> michael
>
> -----Original Message-----
> From: Dan Statman [mailto:dan.statman@...]
> Sent: 15 November 2001 17:01
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] G-Code Arc drawing question
>
>
> I have a somewhat unique situation, atleast I think it is unique. I am
> currently running a 3-axis Sherline converted mill. I have connected the
> Y-axis stepper motors to a vertically mounted ratoary table, and I do not
> have a stepper motor connected to the linear (normal) Y-axis.
>
> I have just started writing G-Code programs and I do not have a CAD
program
> yet (probably will buy BobCAD this wek). I create my G-Code files in
> Microsoft Excel since I am only created engraving patterns utilizing
> functional realtionships between X and Y coordinates.
>
> Since I am doing it this was all of my curved cuts are preformed as a
series
> of finally divided straight line segments, which is really convenient. I
> then rescale my Y-axis data points to place them on a 360 degree rotation
> path (since my Y-axis is the rotary table). I am controlling the mill
with
> TurboCNC configured for a rotary axis as the Y-axis.
>
> Here is my problem (finally!):
>
> When I try out all of the demo versions of the CAD programs and I draw
> circles and curves, it always converts them to the G-Code for cutting arcs
> (makes sense). Is there a way to tell the Cad program to break the arcs
up
> into tiny line segments so that I get the G01 output (many lines) instead
of
> G03 (or whatever the arc code is)? The arc cutting does not work when the
> Y-axis is scaled from 0 to 360 degrees and the x-axis of the part is
scaled
> from 0 to 0.100"
>
> Does this make any sense, and can anyone help me.
>
> I need to keep the Y-axis as an angular axis since then I do not have to
> change any of the code (or configuration settings) for different outer
> diameter rings that I make with the same patterns.
>
>
> Thanks for any and all suggestions,
>
> Daniel J. Statman, Statman Designs
> www.statmandesigns.com
>
>
> If interested, check out the Celtic knot patterns at the bottom of my
> website homepage.
>
>
>
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