Re: [CAD_CAM_EDM_DRO]doodling with ideas

Thanks Doug

Now we're cooking! You a4re saying things that I imagine could happen. Have explored wobble broaching but never got around
to making (or buying) one.

Thanks much! Bill D

dougrasmussen@... wrote:

> Bill,
>
> Yes, there are a number of ways to do what you mention, squares, hex,
> etc. The obvious way is with "live" tooling, that's like having a
> milling spindle mounted in your lathe's tool holder and indexing the
> spindle to mill the flats. Big buck CNC lathes use this method all
> the time. Unsymmetrical shapes like cam lobes are done the same way,
> except the lathe spindle is rotating slowly as the milling spindle
> moves in and out to create the shape. These methods are fairly
> slow, but have the advantage that a part can usually come off the
> lathe complete without needing second operations on a mill.
>
> Another way is by using a polygon turning attachment. This is fast.
> Polygon attachments "turn" various symmetrical shapes on work while
> the lathe spindle is turning at high speed. A polygon attachment
> uses an auxilliary rotating spindle with a wing type cutter rotating
> in synchronization with the lathe spindle. Polygon attachments are
> mostly used on high production non-cnc lathes by using a gear train
> to synchronize rotation the two spindles. Most CNC lathes don't have
> an easy way to adapt a gear train, but I've been thinking it might be
> a natural to electronically synchronize the spindles.
>
> Another method of making both internal and external symmetrical
> shapes on lathe parts is with a "wobble" broach. This is fast. With
> a simple attachment you can easily make internal (or external) hexs
> (and other shapes) while the lathe spindle is rotating at high
> speed. The wobble broach was developed for high production non-cnc
> machines, but can be used as well in cnc lathes or mills. I have a
> couple of CNC lathe parts where we use this attachment. One part is
> a small round head SS screw with a 1/8" hex socket in the head. The
> 1/8" hex is made in a few seconds while the part is running about
> 1800 rpm.
>
> Doug
>
> --- In CAD_CAM_EDM_DRO@egroups.com, BillDarby <ddarby@s...> wrote:
> >
> > Was just sitting here wondering if anyone has used any CNC lathe
> software that would allow you to turn shapes, other then just
> > circular. It occures to me that under CNC control, a lathe should
> be easily capable of turning all sorts of shapes (squares, hex,
> > lobs, cams)????
> >
> > Bill Darby
>
>
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