On Mon, 02 Oct 2017 10:33:29 -0500, Jon Elson
wrote:

Ignoramus13481 wrote:



I thought that there is a lot of such high production parts needing to be
made.

"Back in the day", when there were carburetors, they had 100 special parts
on each one, needle valves, jets and the screws that held it all together,
that were made by the barrel on screw machines. Lots of other products has
screw machine-produced parts, too. All the threaded plumbing fittings were
made on screw machines. Well, a lot of that production has moved overseas,
some of those products are made differently (think fuel injection) and a lot
of these parts are molded or cast in some manner now. So, there is less
demand for this. Also, there are rotary transfer machines that are used
to make all sorts of reall high production parts. These can even beat a
screw machine for throughput.

For one thing, screw machines were at one time used to make -- SCREWS!
I suspect that it would be VERY rare to make screws that way, now. Mostly,
they'd be coined and have the threads rolled. Nowhere as precise, but
precise enough to hold some gadget together.


Jon

Well stated. Bravo!


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