[modeleng] Re: Screwcutting--correction

--- Allen Messer <al_messer@xxxxxxxxx> wrote:

> Patrick, I have only done it a few times when
> cutting
> internal threads when I could not observe the tool. 
> I
> was cutting some .750" x 14 55 degree Whitworth
threads and
> used
> this method on this one off job.
> 
> Question: doesn't your lathe have a threading dial
> mounted on the saddle that engages the feed screw? 
> This is what I always use whether threading
> internally
> or externally---always engage the half nuts when the
> same number comes up to the "mark", dis-engage at
> the
> end of the cut, wind out the cross feed about a
> hundred thou, crank the carriage back to the end of
> the job, advance the crossfeed screw to Zero,
> advance
> the compoound feed a few thou, wait for the right
> number to come up to the mark and then engage the
> half
> nuts again.  It takes longer to tell about it than
> it
> does to do it.
> 
> Al
> --- Patrick Coppens <develop@xxxxxxxxx> wrote:
> 
> > Allen Messer wrote:
> > > It is possible to so mount the threading tool
> > whereby
> > > the cut can be made FROM the shoulder TOWARD the
> > > Tailstock, eliminating the possibility of a
> crash.
> > >
> > > Al
> > > --- Patrick Coppens <develop@xxxxxxxxx> wrote:
> > >
> > >   
> > Allan,
> > 
> > This is true, and I have done that in the past, on
> > repeat jobs, but it 
> > is a bit "of a to do" if it is only for one piece,
> > don't you think so?
> > 
> > Patrick
> > MODEL ENGINEERING DISCUSSION LIST.
> > 
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> > 
> 
> 
> 
>      
>
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