RE: [CAD_CAM_EDM_DRO] minimill n lazycam issues

OK, good idea, but I thought I was doing that with a circle, which did turn
out to be a circle (not an ellipse), but it seems that changing the tool
size doesn't matter. It appears the toolpath turned out to be the line of
the drawing, instead of offset by the tool radius, even though there was a
G41 code - should there be an offset number following that Gcode? Is there
something that we have to do in LazyCAM to get the tool dia to "stick"?

Thanks again!!

Chuck Merja
www.srvscience.org
www.3rivers.net/~chuckm/index.htm

Lemelson-MIT Inventeams - http://web.mit.edu/invent/n-main.html

US FIRST Robotics - http://www.usfirst.org/
lat/long 47.52383 -111.67912
211 Adams Rd
Sun River, MT 59483
vx 406.264.5955
cell 406.799.5955
fax 406.264.5830

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Roland Jollivet
> Sent: Tuesday, March 15, 2011 2:26 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] minimill n lazycam issues
>
> Have you tried drawing a very simple rectangle, or even a straight line,
> and
> getting this to g-code and run it.
>
> At least now you can check that the scale is correct, the origin is in the
> right place, and that the translation is all correct.
>
> Regards
> Roland
>
>
> On 15 March 2011 21:30, ebiz_59 <chuckm@...> wrote:
>
> >
> >
> > OK, we got our grizzly mini mill g8689 going again and are trying to
> learn
> > the CNC process. I wanted the kids to just cut a 0.615 hole in a piece
> of
> > 1/8" thick material, so we ...
> > 1 - Drew the 0.615 circle in TurboCad about vs 8 - I think 1:1 scale,
> and
> > saved as dxf or dwg.
> > 2 - Opened that file in LazyCAM, and I thought we set the tool to
> 0.120".
> > 3 - We uploaded the GCode to Mach3 and ran it up away from the work. It
> > looked to go in a circle, so we
> > 4 - Zeroed the axises and cut away.
> >
> > At first we ended up with a spiral that was 0.615+0.120=0.735 in dia. So
> we
> > changed Gcode to plunge to cut depth first, then cut the circle - ended
> up
> > with a hole of about 0.735 dia. It appears that changing the tool dia in
> > LazyCAM does not change the gcode sent to MACH3.
> >
> > The only way we could get the right diameter hole was to alter the gcode
> > posted by LazyCAM to MACH3.
> >
> > I thought we had the chain selected when we changed tool size (we only
> had
> > one chain) - but maybe not. But I'm assuming that we are doing something
> > wrong in the LazyCAM tool selection/definition regard. Suggestions?
> >
> > Thanks, Chuck.
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
>
>
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