On Sat, 23 Aug 2008 13:44:26 -0700 (PDT), John S
 wrote:

>On 23 Aug, 20:33, Peter Fairbrother  wrote:
>
>> As to using the leadscrew to drive a carriage  or cross feed, I just
>> think it may be too much of a compromise - will the leadscrew still work
>> properly as a leadscrew? Will the pin or whatever which rotates stick?
>> will it cause the carriage to move?
>>
>> I don't know the answer to either question, but I have doubts.
>>
>> -- Peter Fairbrother
>
>In which case ask Myfords, Boxford, South Bend, Emco and a host more
>companies who did and in some cases still do employ this situation of
>a combined lead and feed screw.
>
>John S.


I would suggest that:-

1) It's a nasty compromise that reduces the size needed for the apron and the
cost of the lathe :-(

2) It results in self cleaning half nuts and keyway :-)

Take your choice.


Mark Rand
RTFM