Re: swiss turning in minature?

The parts I am making are not very long so I don't think a steady
would be possible. I really just wanted to take advantage of the
high rigidity for maximum precision. I don't have a suitable lathe
so whatever I do may have to be scratch built.

Precision ground stock may not be a problem and I am sure I would
only need one size. I have some motor shafts for example that are
ground but not hardened.

I may try a few experiments to see if there is any mileage in this at
all and if not it may be easier to build some sort of grinding set up
where machining forces are small and precision can be got that way.

Thanks for the advice,

Graham






--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Marcus and Eva"
<implmex@a...> wrote:

> Hi Graham:
> I would still do it on a conventional lathe equipped with a

travelling

> steady.
> Whether the headstock moves or the carriage moves is really not

relevant as

> far as the requirements of this job are concerned.
> Swissturning is a high volume production process...it's just too

difficult

> to get it going with a cobbled setup.
> The Devil is really in the details with this process, but turning

on a

> normal machinists lathe will do this job easily.
> A good part of the reason that Swissturning is successful as a

process, is

> that it's possible to put a lot of tools into the work

simultaneously, but

> you don't need to do that.
> I'd abandon the idea.
> Cheers
>
> Marcus
>
> ----- Original Message -----
> From: "Graham Stabler" <eexgs@n...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Monday, May 12, 2003 8:53 AM
> Subject: [CAD_CAM_EDM_DRO] Re: swiss turning in minature?
>
>
> >
> >
> > Dave, it is more the machine that I want to minaturise than the
> > parts. The roller I mentioned was to be about 1mm in diameter but
> > other parts may be smaller and accuracy is very important. It is

for

> > a 100:1 planetary friction drive for a 4mm (that's not the shaft

but

> > the diameter) motor.
> >
> > Marcus, thanks. It sounds like you know your stuff. I had

wondered

> > about using just a brass clock bushing that would be replaced

often

> > and held in a ball race. Then I could use say silver steel as a
> > blank as it is fairly accurate. I can't help but feel there must

be

> > a dirty solution. Maybe a makeshift airbearing. Make or obtain

an

> > accurate bush, bore out some of the central section and apply
> > compressed air through a cross drilled hole. This would still

need a

> > good blank material. I can buy hardened ground stock in the form

of

> > drill blanks but are unhardened blanks available?
> >
> > It sounds as if this might not be the simple solution I had hoped
> > for. Darn.
> >
> > Cheers,
> >
> > Graham