On 04/01/2014 10:32 AM, Peter Blodow wrote:
>
> Until the early 1990ies, many lathes were produced in Germany with inch
> screws and a 127 teeth gear wheel to drive them in order to end up with
> metric threads.
>
But that means you can't disengage the half nuts and 
re-engage them
for the next threading pass.  Seems like a very hard way to go
for production, although perfectly acceptable for rare cases 
where
you need a thread the lathe can't provide.

Jon

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