Re: [CAD_CAM_EDM_DRO] Re: lathe arcs

Dave: It is not a one off and to compound the problem each roller has a mate with .040" clearance in between. So , that gives me no
leeway at all. The machine must cut to the drawing specs-period. The radius are as large as 2" in some cases. Thanks,anyway. Carey

davemucha@... wrote:

> If it's a one-off thing hit the grinding wheel and make a form tool.
>
> Can you do multiple plunge cuts to create segmented arc? tool radius
> and angles might give you a smoothe enough finish to get the job
> done. If you're feeeding 0.005" per revolution, then a 0.005"
> seperation between plunges would give the same finish.
>
> Slow and tedious but sometimes ya just need to get the job done.
>
> Dave
>
> --- In CAD_CAM_EDM_DRO@..., "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.
>
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