The one thread roller I've seen (Fette?) had rolls w/ a slot ground on one
side that engaged a matching tab on the roller body.  I presumed it had a
couple gears in the body to keep them "timed".  You can buy the rolls.  The
body looks fairly simple to make.

SMD

On Sun, Feb 26, 2012 at 7:53 AM, Erik Christiansen
<dva...@internode.on.net>wrote:

> On 26.02.12 14:14, Roland Jollivet wrote:
> > And I thought thread rolling required huge rollers....
> >
> > http://www.youtube.com/watch?v=rt8VfgfWa54
> >
> > OK, it is a small OD, but I did'nt think it was doable. The whole
> > contraption looks pretty lightweight .
>
> Hey, yes, that's very doable-looking. Found this while looking at your
> link. Mebbe it comes close to setting a lower technology and rigidity
> limit?:
>
> http://www.youtube.com/watch?v=4qN0XX8Byj8&feature=related
>
> Is the thread depth to be rolled perhaps more the limitation for lighter
> gear, than diameter? (Not sure.)
>
> It looks as if the rollers just synchronise themselves. That's
> intriguing.
>
> Erik
>
> --
> If you understand what you're doing, you're not learning anything.
>                                                           - A. L.
>
>
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