Re: [CAD_CAM_EDM_DRO] Digest Number 1145

>Message: 21
> Date: Wed, 21 Feb 2001 12:11:18 -0800
> From: Alan Marconett KM6VV <KM6VV@...>
>Subject: Re: G02 / G02 I and J arguments
>
>How many variations of I,J style G02/G03 ARC's do you support? I'd only
>seen Vector CAD/CAM generate the one type, because I just use the ISO
>001 output. Is there another output to select to see other variations?
>Just curious. the 'R' style ARC's are also something I wanted to
>investigate.

Vector can output absolute or incremental arc centers, as well as incremental arcs ends and centers. It will use ijk or R. Unlike most low cost Cad-Cam systems it support 3D arcs in the G18 & G19 planes. Under the NC object, Options-Driver, there are Radio buttons to change most of these settings, including using R.

>
>I've heard that G12/G13 (?) are used for Helical Arc's. I would also
>like to generate one in Vector CAD/CAM, and see if my MaxNC -PRO will
>cut it (Gotta find/make a thread mill too)!
>

You could do this, but would have to set up a Vector contour that had an Ask-For to enter the depth. A G12 is the same format as a G02, with the addition of Z value. Some systems use the G02 for planar circular interpolation as well as helical. In some systems a G12 is an arc with an automatic approach and depart, from the center of the circle.

>I didn't ketch who was using a G02 AND a G03 to draw a FULL circle.
>Sounds like cutting that way would cause problems! Shouldn't it just be
>a series of arcs in the SAME direction?

If you use IJK arcs, any time the end point equals the start point, a full circle is generated(interpolated ;-).

G17
G01 X1.0 Y0.0 Z0.0
G02 X1.0 Y0.0 I-1.0 J0.0

Using a G02 & G03 will not make a single, full circle, but could cut a circle twice, once in each direction.


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