Re: [CAD_CAM_EDM_DRO] Polar Coordinate based CNC

Most Fanuc type controllers have a G code associated with polar
coordinates G15 polar system off,G16 Polar system on, this typically deals
with X=Radius and Y= Angle of hole from O (pivot point) which is the last
point programmed before G16 is called and a Call of G17-18-19 to select the
plane you are working in G-17 equals XY. This situation would also be a
perfect application for a macro since polar coordinates typically use the
same parameter values as a fixed cycle X,Y,R,Z,F etc.and the macro could be
used without having to have the Polar Coordinate option involved.

Paul E. Killoy

--- Original Message -----
From: "Raymond Heckert" <jnr@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, November 02, 2002 6:15 PM
Subject: Re: [CAD_CAM_EDM_DRO] Polar Coordinate based CNC

> As it happens, my SHARNOA CNC Vmill uses Polar coords for
> rapids (G10), linear feeds (G11), and circular
> interpolation (G12 & G13). The Polar mode allows
> geometrically pure ellipses, too. Also, makes very easy to
> machine helixes (read make threads). There are also two
> recti-linear G-codes, G00; a rapid, and G01; a linear
> interpolation. But, perhaps you're talking about a
> 'Robot-Arm' type of effector, where you'd have to calculate
> the angle vs. arm radius to determine true position.
>
> RayHex
>
> ----------
> > From: Lee Wenger <wenger2k@...>
> >
> > What all would have to happen to allow a CNC machine to
> be based on a polar coordinate system rather than a
> rectangular one. The big benefit to me would be that the
> single most expensive component of a router/plama type of
> system is the slides and drive components (the screws or
> rack/pinon not the motor itself) for the longest axis (for
> systems of the size/type I have in mind this would be to
> move a gantry). But I assume that would mandate a change
> to the controller so it could interpret g-codes as polar
> coordinates. Are there any controller packages out there
> currently that support polar-coordinates?
>
>
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