Re: [CAD_CAM_EDM_DRO] Re:4th axis rotary with a 3 axis control

----- Original Message -----
From: "Ron Ginger" <ginger@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Wednesday, September 06, 2000 7:28 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re:4th axis rotary with a 3 axis control

> Dan Mauch wrote:
>
> Yes, and I even found it did it right a couple times. I also found it
> doing some VERY strange things, so I have never trusted it. I tried some
> real simple test patterns, like a square and a circle.
>
> Are there some rules about how to start and stop the cutter comp? It
> seemed like I had to make an offset move first to get away form the part
> edge, then turned on cutter comp and it ran around a square OK.

G41/G42 needs some room to get started. What you need to do to make things
work is, Turn G41/G42 on with a move toward the part going in the same or
near same direction as the first cut.
G41 is to the left of the direction of travel when the tool is moving away
from you. If you are going arround the outside of the part clockwise, use
G41. When you are done with the contour, cancel with G40 on a retract Z
move. If you cancel on an X/Y move, you have the chance of the cut line
intersecting the part.
Look at the code example below.

>
> Suppose I had a simple square like this:
> G00 X0 Y0
> G00 G42 X1 Y0 Changed to G00 added G42 for offset positioning
> G01 Z-.5 Feed cutter down
> G01 Y1
> G01 X0
> G01 Y0
> G01 X1 Add this to complete square
> G00 G40 Z0 Cancel and retract
> G00 X0 Y0 Go to start
>
> That I wanted to do with a 1/2" mill, around the outside, leaving a
> finished 1" square. What gcodes should I add to make this?
>
> ron
>
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