Shorten lathe chuck jaws...

[jkohler]

Alex's Mimi vblocks with the bearing works sweet. It's really a nice stress free and sold set up. I really like it anyway. Thanks for sharing it Alex.

 

[paperpuncher]

I know, I see the rods. That setup with want to force the barrel to center.

I dont see how the clamping force this setup imparts would be different than a spider with radius ed contact points or a pc of copper wire wrapped around the bbl shank and held in a 4 jaw or a 4 jaw with tabs between the jaws and bbl. It is still a small radiused contact area I would think it would allow the barrel to gimble. Are these other set ups equally problematic in terms of binding? Just curious.This is not my chuck BTW I just saw it and thought it to be a rather clever design. I have a longish headstock so I use a spider to shorten things up as much as possible.

 

[Bamban]

I

l

I have a Grizzly spider, don't like the screws, I have an extra 4 jaw chuck..

Here is what I did with the Grizzly spider for my Jet 1024, just bolted, centered and indicated it true to the face plate. Using the aluminum finger clamps, the barrel gimbals on the 1/4 inch ball hearings. Simple cup point 3/8 x 24 set screws have enough cup and to bear on the ball bearings.

The nuts behind the faceplate for the clamp down grade 8 bolts are the plain unistrut bolts, they have enough width in them that they don't rotate when torqued down.

 

[Ggmac]

I think the OP want to shorten the distance thru the headstock !

 

[X Ring Accuracy]

Or buy a set of aluminum jaws, cuts easy and save your old ones.

 

[eww1350]

That is an interesting idea.. Just finished sawing off the 2 steps on the front of my chuck jaws, and milled them to clean up the saw marks... Just shortened my length by 1-1/8"...

Thanks for all the great ideas, keep them coming others will want an alternative to what I did..


Eddie in Texas

 

[Cloudrepair]

[/IMG]

what I used to make mine.
I'm using brass pads now.

 

[Cloudrepair]

I had been thinking about cutting down the jaws on a 6' 4jaw also but for other uses. Now that I found a nice 8' 4 jaw buck chuck. I may still do that with the 6'.
I would use the cutoff tool on my angle grinder method, I use that tool All the time.

 

[Cloudrepair]

Why not steel? No more need for a sacrificial metal in the setup as you not bind anything up now.

that would work good with less compression.
You always have good ideas.

 

[Cloudrepair]

I wasn't being sarcastic i do like that idea.
Maybe I need to rearrange my methods, right now I haven't wanted to throw the barrel back in the lathe for polishing after chambering and crowning/threading the muzzle

 

[Cloudrepair]

I knew you weren't. I have inverted cones I made for my barrel spinner. I polish after the works all done and the cones let me not touch the bore.
I did a test this am. I have a barrel in the lathe and had the throat dialed in. Went to back of the barrel and to move it .0001" I had to push the muzzle end .004". But the barrel spung back. I had to push it .035" to over come the grip I had on it with the chuck so that it stayed that .0001" when I backed off the spider. So this type of chuck will hold a barrel in position without an out board spider but with a ring you need the help of a spider. So how much bend are we putting in a barrel to get it indicated in? That .035 I pushed the muzzle only showed about .0018" on the breech end. If I had to move and hold the breech end .002" I would have put a .035" bend in the barrel. Now, you could loosen the chuck and chase it back and forth and probably get a decent setup, but it would take a long time. Holding the barrel only at the breech the weight of my finger deflects the muzzle .001"

I need to do some more testing.

Alex do you use a little grease on the ball bearing tip screws?

 

[Cloudrepair]

As perfect as I would like to believe my setup is perfect and even with the grease and the time i take to dial my barrels in i may still have a slite deflection in the setup.

 

[carlsbad]

If you realize that this thread has evolved to discuss the most important part of the barrel chambering process, you are well on your way to doing it right. --Jerry

 

[Cloudrepair]

The only way to be sure is to have everything dialed in how you want it holding the barrel only by the chuck end. Then snug the outboard spider just to support the muzzle end, making sure not to move it.

I'm gonna try that

 

[Cloudrepair]

If you realize that this thread has evolved to discuss the most important part of the barrel chambering process, you are well on your way to doing it right. --Jerry

I think I've already done it right but there is always room for improvement and i don't mind learning from anyone.
I'm thankful there are plenty here willing to share.
This subject is one of those that kinda get a mind of its own.

 

[Cloudrepair]

Or maybe it's just me

 

[carlsbad]

I think I've already done it right but there is always room for improvement and i don't mind learning from anyone.
I'm thankful there are plenty here willing to share.
This subject is one of those that kinda get a mind of its own.

I like your setup. My post was addressed to readers rather than authors. --Jerry

 

[Cloudrepair]

I like your setup. My post was addressed to readers rather than authors. --Jerry

Thanks

 

[butchlambert]

You might take the time to peruse the PDF that is a sticky at the beginning of this forum.

 

[Cloudrepair]

You might take the time to peruse the PDF that is a sticky at the beginning of this forum.

Lots of good stuff In there