re:Re: lathe arcs

Hi Carey,

Don's probably got ya covered, but just in case...

First, Can you correctly make the "previous" rollers now!? Using
whatever means you used before? If so, then you know there is no
change in the system functionality. If NOT, then you know to look at
ANY changes made since they last ran correctly. I would keep trying
to run them until they are cutting correctly; THEN go to the "new"
stuff.

Don mentioned G18. You could also use g17 (xy plane for arcs)
and "cheat" by changing the cables to the motors.

Sorry I can't do more than this. I have mentioned in the past that I
have experienced some "strange" output from CncPRO... usually
excessive Z motion. Would this correlate to your problem? I.E., the
arcs are ellipses or worse, jagged ellipses?

Hope this helps.

Ballendo

--- In CAD_CAM_EDM_DRO@y..., "Carey L. Culpepper" <mr.c@b...> wrote:
> I am in need of some help. I am doing lathe work on my cnc converted
> Hardinge hlv-h lathe. I am making forming rollers for specialized
sheet
> metal shapes. The first sets of rollers were strictly angular flats
and
> angles. The next stages require arcs (fillets). I cannot get my
machine
> to cut the arcs. It machines all of the flats and angles perfectly
but
> does weird things when it gets to the arcs. The drawings and gcodes
are
> Vector 8.2 generated. I even went back and altered a previous BobCad
> drawing(which was used to make the previous rollers without problem)
> with some fillets. Same type of problem. I have been working on
this for
> several long frustrating days. I have talked with Fred and tried
some
> things and emailed Doug and tried doing it with relative coordinates
> which did result in some arcs but still not accurate to the
drawing. I
> am using CNCPro as a control program. I have tried drawing in
different
> quadrants, all manner of different things- all wrong. This is
probably
> something really simple as far as setup(to the experienced
operator) but
> I just haven't found it yet. I made up a pen holder to draw the tool
> path on the lathe and have gotten some rather unusual shapes. Fred
and
> Doug have been very helpful but it is the weekend and I am
desperate.