On 23 Aug, 23:51, Mark Rand  wrote:
>
> I would suggest that:-
>
> 1) It's a nasty compromise that reduces the size needed for the apron and the
> cost of the lathe :-(

Not sure I totally agree with your suggestion here Mark, it wasn't
"nasty" enough to stop Schaublin using "the robust, buttress-thread,
4mm pitch leadscrew, for both screwcutting and the sliding feed", and
I don't think many describe them as compromised down to a price - at
least not a price I could afford :-)) To be fair though they didn't
bother with power cross feed at all and the drive system for the
leadscrew was far from simple, so as you say you pay your money and
choose your compromise.

>
> 2) It results in self cleaning half nuts and keyway :-)
>
> Take your choice.
>
> Mark Rand
> RTFM- Hide quoted text -
>
> - Show quoted text -


Helps with the sale of replacement half nuts as well, at least it does
if the lathe is good enough in other ways to last a reasonable amount
of time.

Regards

Keith