It's pretty common, in the used tooling market, to find chucks with either an integral back plate or the back plate already mounted. The buyer should beware of used 3 jaw chucks because they're often worn out, but most used 4 jaw chucks seem to have had a pretty cushy life.
----- Original Message -----
From: Wissahickon Cyclery
Date: Wednesday, May 16, 2012 4:11 pm
Subject: Re: RE: [Frame] Lathe Question
To: Truls Erik Johnsen
Cc: framebuilders
> I had that lathe and if it is the one with a variable speed
> system (5800
> series?) and is an actual Clausing rebranded with the Atlas name
> tag it is
> a L00 spindle nose. A picture would solve this in about 3
> seconds. The
> L00 is a rather common spindle nose and most of the time you
> have a plan
> back 4 jaw and the L00 adapter plate that will require you to
> machine the
> correct shoulder for the chuck you want to use. The plates are
> made from
> iron and make a huge mess with a REALLY abrasive chip. Make
> sure you cover
> the ways with plastic when you machine the back plate and clean
> everythingup the best you can.
>
> Hope that helps.
>
> Cheers,
> Drew
>
> On Wed, May 16, 2012 at 2:39 PM, Truls Erik Johnsen
> wrote:
>
> > Listen to Alex not me. I'm guessing, Alex have the proper answer.
> >
> > T
> >
> >
> > On Wed, May 16, 2012 at 8:33 PM, Alex Wetmore
> wrote:>
> >> That's it!
> >>
> >> Tools4cheap is
http://tools4cheap.net , sorry about the
> typo. Note
> >> that from them you'd need to buy a chuck and a mounting
> plate, then machine
> >> the mounting plate to the chuck.
> >>
> >> At Plaza you can find it all together and in higher quality, but
> >> ordering will take a couple of weeks. Looks like $150ish
> gets you a range
> >> of US-made 6" chucks with backs installed from Union or Craftsman.
> >>
> >> Double check the spindle nose sizing first of course, by
> removing the
> >> 3-jaw.
> >>
> >> alex
> >>
> >>