[Shop-talk] Identifying taper and threading attachments on a

[Joe Szwed]

Arvid,

I think your right.  When I did my apprenticeship back in the early 80's the
only cnc stuff I saw was used for high volume.  In the shop I worked in, we
had two turret lathes for any volume parts and no cnc equipment.  Two of the
Bridgeports had readouts on them.   I think today's stuff is a lot easier to
program and used for a lot of small jobs too.  

But for repair work and very small volume stuff, there are still some small
shops around doing it the old way.  

Now having said that, I still on occasion deal with some small shops for
repair parts at work.  The last part I hard made was just a short piece of
bar stock with both ends turned down and threaded for 1" pipe.  The first
part they made, they didn't cut the threads deep enough. So I sent it back
thinking they would just pick the threads up and cut them deeper, but it was
faster and easier just to make a new part on their cnc lathe.  And this was
a real small shop that operates out of an old chicken coupe.

Joe

-----Original Message-----
From: Arvid Jedlicka [mailto:arvidj at visi.com] 
Sent: Wednesday, October 19, 2011 1:22 PM
To: Joe Szwed; shop-talk at autox.team.net
Subject: Re: [Shop-talk] Identifying taper and threading attachments on a

Joe,

Just curious ... you just don't cut threads and tapers any more or have
converted the lathe to CNC and just let the machine does it all?

Scott,

For threading, you might want to check out an example of what might be
needed on page 16 - 19 in this manual
http://cdn0.grizzly.com/manuals/g4003_m.pdf. You can see the threading dial
that Joe mentions plus the lever to engage the half nut. You will also see
that -- for this lathe and many others -- that there might be gear changes
to cut certain thread pitches. You will want to make sure your lathe comes
with the appropriate gears for the threads you want to create. For a used
lathe the gears may be in a cardboard box on the floor near by the lathe or
gone walk-about.

Arvid

-----Original Message-----
From: Joe Szwed
Sent: Wednesday, October 19, 2011 8:28 AM
To: shop-talk at autox.team.net
Subject: Re: [Shop-talk] Identifying taper and threading attachments on a

For cutting threads the lathe will need a threading dial.  These are
typically mounted on the right hand side of the carriage apron. Some are
built in, some pivot on a bolt so you can disengage them when not in use.
The dial is numbered 1-4 with dashes in-between.

A taper attachment is mounted on the back of the carriage.  It has a guide
bar that pivots so you can set your taper.  It is a noticeable appendage
sticking out back there, so I think you would see it in a picture.  To use
it, the cross feed is disconnected, the clamp on taper attachment is
tightened so it locks it to the bed. So that when the carriage is moved, the
cross feed follows the taper set on the guide bar.  The arm that you clamp
is typically disconnected and left hanging out of the way near the back of
the bed.  I mention this cause I think you want to make sure that it is not
missing.

I hope this helps, I haven't cut threads or used a taper attachment in many,
many years so I am going from memory here.

Joe


>So...anybody know an easy way to identify if a lathe has those from 
>looking
at a picture?
>
>Thanks.
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