Re: http://www.cncmotion.com/

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "forumtvm" <forumtvm@y...>
>wrote:
> Hi John,
>
> Will dearly love to see if you can use Dolphin to cook up something
> for us along the line of those photos.
>
> Peter

Not quite the same but here's a 4th axis application done in Dolphin.
This is a gearbox cam for a 6 speed racing bike gearbox.
The scrolls move the gear selectors as it rotates. Easy to machine
but quite hard to map out so it doesn't clip the gears.
This one is for a 6 speed Manx Norton.

Years ago we used to build fluting and Barley twist lathes but these
were manual machines and before the advent of cheap CNC.
They were basically a standard wood lathe with an extra set of bed
rails above the work. A router used to slide on these rails and was
either slid along by hand and the work indexed round to produce
flutes or the router was dragged along by a wire rope wrapped around
a large disk at the end of the spindle. As the disk and spindle was
turned by hand the wire rope moved to router to give the classical
barley twist.

If you chose a samll number of twists say 3 or 4 and fed a corner
rounding type cutter in quite deep you could cut the middle of the
spindle away to give a skeletal or filligree hollow pattern.

John S.

>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "stevenson_engineers"
> <john@s...> wrote:
> > Peter, probably just as quick to program these by hand.
> > Then run that code as a subroutine over again to produce the

right

> > number of spirals.
> > I see they are agents for Bobcad so they probably use this but
> having
> > used Bobcad I stick by my comments above.
> > A simple spiral program will look like this
> >
> > N** Z -0.2 F 5.0
> > N** X 10.0 A 20.0 F25.0
> >
> > Where the first line feeds the tool into the work and the second
> line
> > moves along 10" whist twisting thru 20 degrees.
> > You then retract the tool, move back to the start in X and index
> > round to the next position and repeat.
> >
> > John S.
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "forumtvm"

<forumtvm@y...>

> > wrote:
> > > Hi,
> > >
> > > Anyone knows what cam system (or how to manually program) a

lathe

> > to
> > > produce those beautiful wood turnings featured in the cncmotion
> site
> > >
> > > http://www.cncmotion.com/
> > >
> > > in the cnc lathe section?
> > >
> > > Peter