Lathe head stock length

[Nvreloader]

Guys,
I have a lathe that has a 22" head stock length, in 1-3/8" diameter hole,
which also has a collet system installed,
and also have a 4 and 3 jaw chucks using the D4 cam locking system, that attach to head stock nose end,

I want to install a couple of spiders for each end to better center barrels for chambering etc,
I finally found a way of using a blank D4 ring to the nose end,

The tail end with the collet end is the problem etc.

Does anyone have an Idea or suggestion,
on how to install/make spiders to install/fit over the collet end attachment system??,
which I do not want to remove etc.

Tia,
Don

 

[riflewoman]

Put a bushing (aluminum is fine) in the draw tube. If you put an o-ring on it it will self center and retain itself where you put it in the tube.

 

[akajun]

Buy or build an action truing fixture as seen in this thread.
http://www.practicalmachinist.com/vb/gunsmithing/good-tubing-action-truing-fixture-256662/
Mine is permenantly mounted to a backplate, but you can run it in a four jaw . Another advantage is it allows you to chamber/ thread barrels shorter than the length of your headstock.

 

[ridgeway]

Machine a collar that slips over the OD of the spindle. Use 4 set screws to hold in place on the spindle. Drill and tap the end for 4 brass tipped screws.

 

[riflewoman]

The OP said he didn't want to remove the draw tube. Most draw tube setups aren't easy to add external spiders particularly the lever actuated. But the tubes run true enough to support a rifle barrel with a sleeve around the barrel at some distance from the chamber. This can be cut to final size to center the barrel, but an o ring will center it well enough for all but the most demanding work.

 

[Nvreloader]

Thanks Guys and Gals,

There is NO way to fit a collar over the outboard shaft, it has a 3"+ flange that fits on the head stock shaft that the collet system attaches to, with a lever system etc.

At the present time,
I am using a turned alum sleeve/bushing about 3+" long with a 60* cone turned to a point, (fits into the bore/chamber) that is approx .005" smaller than the inside of the head stock shaft, there is a large spring that sits against the end of the outboard collet collar and compress's when the button and bbl is inserted inside, which holds the bbl as straight as possible when the other end is held in the chuck.

Not the best system,
but works until I find a better way to accurately hold the many short bbl, 16-20",
I end up working with this long 22" shaft length etc.

I was hoping that someone could suggest a better way, to internally hold these short bbls. etc. ;D.

Tia,
Don