Re: [CAD_CAM_EDM_DRO] Re: cutting threads on lathe

Guys,
I think David has the right idea. If it was my job, I'd buy the raw
tubing in 20 ft. lengths, thread it with a Geometric Die Head, which pops
open when you reach the 12" of thread, use a cutoff blade to cut to length,
and start on the next one. The alternative is to get some prices from an
Automatic Screw Machine shop. After their initial setup, their only labor is
to feed the tubing through the spindle, push the start button, and come back
once in a while to load another piece of stock. If you furnish your own
material, it's a pretty inexpensive job to run.

Marv Frankel
Los Angeles

----- Original Message -----
From: "doug98105" <doug.rasmussen@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, October 06, 2003 11:47 AM
Subject: [CAD_CAM_EDM_DRO] Re: cutting threads on lathe


> David,
>
> You want to thread the full 12"?
>
> 1. A CNC lathe wouldn't have much of an advantage for this job over
> a machine you could build for full length threading since it would
> have to be a die head job. CNC's are good at single point
> threading, you can't single point 12" of thin wall tubing, though.
>
> 2. If you're threading the full length a "small" CNC wouldn't do
> it, they don't have that much travel. Yes, you could auto feed raw
> tube stock, thread, cutoff, and feed out again. If you only need a
> short thread on one or both ends a "small" CNC lathe could do that
> by single point threading one end, feed out 12", plunge thread the
> other end, part off.
>
> Can't you buy this material already threaded? I would think you'd
> have to get into horrendous quantities to justify the expense of a
> CNC machine.
>
> Not sure exactly what an Automat is, I suspect it's similar to a
> Hydromat which could do this type work, we're talking very, very,
> big bucks.
>
> Incidently, in my shop we do lots of end threading on 21" long
> rods. This is done on a small CNC lathe with die head using manual
> loading. We've got the process down to four a minute for a 1" long
> 1/4-20 thread. Since these orders are usually for about 3,000 parts
> I've looked at all sorts of auto loading mechanisms and haven't
> found any method as reliable as manual loading.
>
> Doug
>
>
>
>
>
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "fineartlight" <yahoo@d...>
> wrote:
> > I am a small lighting manufacturer with one CNC mill running and
> now
> > considering building or purchasing a lathe to thread 12" long
> 3/8"OD
> > 1/8 IPS tubing. Could be thin wall steel, brass or aluminum.
> >
> > Questions are:
> >
> > 1. With a lathe is CNC the way to go for threading and cutting?
> > 2. Is a small cnc lathe with a auto feeder a realistic possibility?
> >
> > What are my other options for threading the tubing? I have seen
> > something called an Automat ? What is it?
> >
> > David.Munson@F...
>
>
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