My recollection is that for ANY thred you can re-engage the nut on the
same point that you were on the dial (eg if you were first engaged on 1
- you can always re-engage on 1). Certain threads can then be
re-enagaged with the dial on the odds - so 1 or 3, some on any number,
some on any mark (ie the halves as well). So, if in doubt, just wait for
the original point on the dial...
The other thing I have done on light threads is to run the lathe
backwards - with the tool upside down. This allows you to cut a RH
thread away from the chuck - which is useful if you are running up close
to the chuck. Of course it puts all the wrong loads on the machine
(having a tendancy to lift the slides off the bedways) so not ideal -
but can be done for small cuts on a small thread.
On 20/10/2011 06:59, Randall wrote:
> I agree. And even the threading dial is not strictly necessary. It
> doesn't work anyway, for some small group of threads. (I forget the
> rules offhand, but ISTR you can't use it for Whitworth threads.) If
> you don't have one (or it doesn't work for the thread you're doing),
> you just never open the half nuts and run the motor in reverse to move
> the carriage back to the right.
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