[modeleng] Re: Screwcutting
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sat, 24 Nov 2007 07:22:50 -0800 (PST)
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 55 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
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