Re: [CAD_CAM_EDM_DRO] Re: Swiss turning conversion

I don't remember who started this thread.
Today I had a short look at one of these lathes.
In this case pretty big and old but hitting hard making a lot of chip.
In this machine all 4 cams are mounted on one single shaft
which is connected to the spindle by a cascade of pinions.
The way I would go is like Ian? said put servos on standardized cams
but one for each cam (axis.) This way you are able to manipulate every
movement individually. The only problem might be to get an appropriate
software to synchronize the different movements. at the same time.
I see a really good and pretty cheap opportunity in this approach to convert
a CNC. The most expensive items will be the necessary high count encoders.
Good Luck
Sven Peter

Chris Paine wrote:

> If you look at Star micronics their swiss type cncs work with ordinary
> rolled bar but it does need to be consistent, not mixed batches. There is a
> collet at the front which allows the bars to be slid forwards but rotating
> with the bar and a collet "inside" which actualy rotates it and moves
> forward or back, also milling and drilling spindles to work on the sides and
> ends, and a second spindle to get at the back end, sadly not in the hobby
> price range but it does work and they are acurate. There are two where I
> work but the only involvment I have with them is repairing the odd broken
> part. Some brave person might fancy making a home version.----- Original
> Message -----
> From: <dougrasmussen@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Wednesday, April 25, 2001 6:06 PM
> Subject: [CAD_CAM_EDM_DRO] Re: Swiss turning conversion
>
> > Smoke,
> >
> > One of the major drawbacks of roller bearing setups is chips get
> > pulled in under the rollers, plus they don't give full contact
> > support. A solid support of the bar is important to getting the
> > accuracies these machines are capable of.
> >
> > The "standard" of the Swiss turning business is still the fixed (non-
> > rotating) carbide bushing. They look similiar to a collet except for
> > the carbide pads. Some swiss machines use a rotating guide bushing
> > (basically like the ID of a ball bearing), but those bushings are
> > incredibly expensive. Of course for hex and other non-round shapes
> > you would have to use a rotating bushing.
> >
> > When I first looked at swiss machines I thought there must be a
> > better way than the fixed bushing. Apparently not, as yet no one has
> > come up with a workable solution that's better.
> >
> > Doug
> >
>
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