Hi John,
I also often thread by hand, turning the chuck w/ key - Lathe UN-Plugged as you suggest. Opening the halfnut & withdrawing tool can be tricky, esp. if your low speed is much over 25 RPM. My asian lathe is 70+ at slowest speed.
Still, good article. lol
Be well,
CT2
--- In gingery_machines@yahoogroups.com, John Ashburn <ashburn_john@...> wrote:
>
> Love the text and pics of the thread cutting.am no expert to thread cutting,in fact a chicken when it comes to withdrawing the tool at the end of the cut.To avoid costly mistakes after all haven't we all got a failed piece to cherish hidden with unashamed pride to exhibit to the privileged few who confide in you of their failures.a pice of knowledge that was given to me by my former bro in law a quality machinist trained in the munitions industry.I cut my threads by a hand driven crank inserted into the hollow spindle of my dear old atlas that has been lovingly used by me and former owners.i wire the half nut handle in the engaged position and wind the handle by hand to the end of the cut. Then wind backwards to start a new cut with more in feed on the tool. No mistakes. And no crashes,no broken gears and no harm to the pride or pocket.I lost the connection once and is why I consulted the expertise of a a1 machinist. He told me to never risk an old machine and wire the half nut engage lever and the forward reverse lever on the atlas.we do get far east machines over in Australia and they do vary in quality. Again pocket rules the purchase price. Sky is the limit here so the market goes from hobbyist to tool room quality.just a few cents worth from an Australian group cousin . Cheers to all. John.ps a safety message. Isolate the lathe power if using this method.
>
> Sent from my iPad
>
> On Aug 30, 2011, at 7:45 AM, "Brite" <coldtoo2000@...> wrote:
>
> > I especially like his method of re-engaging the halfnuts!!
> >
> > Thank you Nelson, and thank you Mr Hoffman!
> > CT2
> >
> > --- In gingery_machines@yahoogroups.com, "Brite" <coldtoo2000@> wrote:
> > >
> > >
> > > http://conradhoffman.com/metricthreading.htm
> > >
> > >
> > >
> > >
> > > --- In gingery_machines@yahoogroups.com, "Rod" <granthams@> wrote:
> > > >
> > > >
> > > > Cutting metric threads on an imperial lathe is a pain at best. The lathes available to the small shop machinist in the states don't seem to be available with metric lead screws and thread dials.
> > > >
> > > > For the occasional metric thread, I've fiddled with changing the gears, leaving the half-nut engaged and running the lathe back and forth to cut a thread.
> > > >
> > > > Do you folks that live in Europe, Australia, etc. get Asian lathes with imperial or metric lead screws?
> > > >
> > > > Any suggestions other than CNC or electronic lead screw?
> > > >
> > > > Rod
> > > >
> > >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
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