Re: [CAD_CAM_EDM_DRO] Rope turnings in wood.

I understand the mechanics. My father made such a machine 30 years ago to
make tapered legs for tables, except he used pulleys for the ratio's.

The thing was built out of angle iron and U channel, with 1" x 0.5" bright
mild for the ways. It worked just fine.

Roland

(PS, the Z axis is the headstock spindle)

On 5 February 2010 21:29, David LeVine <dlevine144@...> wrote:

>
>
> Roland Jollivet wrote:
> > That sounds like a hellish amount to pay for a machine that could be made
> > for $2000 or less.
> >
> > If you consider that a router is generally hand held, the forces on the
> wood
> > are very low. Sure, you don't want it to dig in, so it has to have
> resonable
> > rigidity, but the parts are simple.
> >
> > Roland
>
> Actually, using my understanding of lathe CNC terminology, the "Z" axis
> is parallel to the headstock spindle and the ways, the "X" axis is
> perpendicular to the "Z" axis and parallel to the floor, think of it as
> the cross slide.
>
> The router should be mounted with the bit parallel to the "X" axis,
> think of mounting it on the cross slide with the centerline intersecting
> the centerline of the headstock spindle.
>
> Based on the above and what he appears to want to do, it sounds like the
> spindle will need little power, just good rigidity and low speed. With
> low backlash, the system is simple and reasonably easy to build. I am
> not so sure about the g-code writer since the "Z" axis wraps.
>
> Practically, an 18 tooth and a 10 tooth pulley (with belts) on a 200
> steps/rev stepper should give 1�/step at the spindle. With
> microstepping (e.g. 10X on Geckos, 8X on many others, etc.) the
> resolution should be quite good (under 0.002" on a 3" workpiece) which
> should give good results. Is it a good idea? I don't know, but I would
> guess so.
>
> However, making your own ways, etc. is more work than reusing a clapped
> out lathe, IMHO.
>
> There may be better ways (from the software view) than using standard
> lathe nomenclature, however. Calling the "Z" axis the "A" axis for the
> purposes of software ("Z" is often linear, "A" is rotary), which may be
> contrary to lathe terms, better describes the function of the axis from
> a router standpoint and potentially from the software standpoint.
>
> --
> David G. LeVine
> Nashua, NH 03060
>
>
>


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