Set thru type chuck

[10xsllc]

does anybody use for chambering if so 3,4 or 6 jaw?

 

[jkohler]

I believe jackie schmidt over on Benchrest central chambers with a 3 jaw. There was a article at one time of his procedure.

 

[Gappmast]

I use a 6 jaw Buck. Best thing sense sliced bread.

 

[carlsbad]

I misinterpreted your question.

You're speaking of misaligning the set tru to align the bore of the barrel.

Because of geometry, the 4 alingnment bolts are not at 90 degrees and I find them hard to set up. But I guess it would work for the inboard end.

I'd prefer a spider.

--Jerry

 

[Dusty Stevens]

A 3 jaw set tru type is just fine. Some use a 6jaw but those are for not distorting thin tubing- extra cost not needed on rifle barrels

 

[Terry]

Dual Spiders

 

[coontz74]

I use a 6 jaw Buck. Best thing sense sliced bread.

I also have a 6 jaw Buck...completely rebuilt, new screws, skim cut all faces square...yada, yada, but for the life of me the thing is more difficult for me to “dial” in that last .001 (let alone +/- .0001) without moving when I tighten up the thru face bolts.

How do you do it? I’m sure the issue lies with me....PM if possible since I don’t want to derail the OP’s thread further.

 

[Gappmast]

I also have a 6 jaw Buck...completely rebuilt, new screws, skim cut all faces square...yada, yada, but for the life of me the thing is more difficult for me to “dial” in that last .001 (let alone +/- .0001) without moving when I tighten up the thru face bolts.

How do you do it? I’m sure the issue lies with me....PM if possible since I don’t want to derail the OP’s thread further.

The thru face bolts should be tight enough to hold the two surfaces together but but still let you center the chuck. If it is set up right you shouldn't have to tighten the thru bolts after indicating your part

 

[Gappmast]

Set tru's are heavy. I have a 6 jaw bison that I'm tempted to sell every once in a while. They are extremely accurate but a properly fitted quality chuck is just as accurate and lighter to put on and take off.

the set tru also adds some overhang which is a problem if you lathe is stiffness challenged anyway like most hobbyist lathes are (I bet gappmast has a very nice heavy lathe behind his Buck).

Now to answer your original question. A set tru chuck would be useless for chambering since it is accurate on the outside diameter and you need to adjust on the inside diameter. You need a spider/cathead.

Perhaps you are thinking of the setup that uses a 4 jaw and a piece of copper wire. This will work on the inboard end but you'll need a spider on the other end. And you need to use a 4 jaw, not a set tru.

But your real question was "does anybody do it" and the answer is, yes, some of the mass producers probably do. thus the poor quality.

--Jerry

My lathe is a 13X36 Birmingham. The buck chuck is a 5" six jaw adjust tru. I would like to have a 6" but this one fell of the back of a truck. It is still big enough for a 1.3" barrel

 

[coontz74]

The thru face bolts should be tight enough to hold the two surfaces together but but still let you center the chuck. If it is set up right you shouldn't have to tighten the thru bolts

I guess my issues arise thinking I need those face thru bolts “TIGHT” as the last step. Maybe I should keep them somewhat “tight”?

My Buck is a 12” 6 jaw and very, very heavy...just for reference.


I appreciate your reply....

 

[carlsbad]

Coontz, Yes. keep them snug. If it still moves, take it apart and indicate the faces and consider a cleanup cut on the backplate. --Jerry

 

[Dusty Stevens]

My lathe is a 13X36 Birmingham. The buck chuck is a 5" six jaw adjust tru. I would like to have a 6" but this one fell of the back of a truck. It is still big enough for a 1.3" barrel

If you get a 6 id like to consider buying your 5

 

[Danny1788]

What I like about my 6jaw set tru chuck is that I put a ring of copper wire around the barrel and then I set the clamping force around the barrel and it never changes because I’m am adjusting the whole chuck and not the jaws. Clamping force stays the same no matter the adjustments being made

 

[swd]

I've been using a 3 jaw Buck Set Tru for years. I probably only use my 4 jaw once every few years and I don't think I've ever used my standard 3 jaw. The 3 jaw Buck is geat chuck!

 

[Walt Krafft]

3 jaw 6" Buck. I didn't buy a 4 jaw for my new lathe. And, can not remember when I used the 4 jaw last on my old lathe.

 

[HillbillyLongRifle]

I have two Buck Adjust Tru 3 Jaw chucks on my lathes. I love the set tru chucks. I also have a 6 jaw i use from time to time but i use the 3 jaws more often!

 

[tobnpr]

I have a 6", 6 jaw and a 8", 3 jaw Buck and I wouldn't want to screw up their being dialed in to center a barrel (or anything else for that matter).

That's what my 4-jaw is for, I only see a down side to adjusting a set-tru for this. I suppose if I didn't have a 4-jaw, or only used the chucks for barrel work it wouldn't matter.

Actually, spider from Grizzly just came a few days ago and for $25, mounted to a backplate I already had- reduces my spindle stickout significantly. Going to replace the brass tips with ball bearings and "shoes" when time permits.

Anyone needing an inboard spider for your spindle, you can't beat it for the price; couldn't make it myself that cheap.

https://www.grizzly.com/products/Bald-Eagle-Aluminum-Spider-Plate-5-Diameter/BE1125

 

[carlsbad]

Tobnpr
I made a great spider out of a grizzly like you describe. I put a couple of interference fit pins in it so I was sure it wouldn't move and I replaced the screws with 1/2-20 brass tipped long allen screws. As solid as anything I've ever used.

Well said about the set tru. Once you get them perfect you don't want to touch them.

--Jery

 

[Dusty Stevens]

So yall get a set tru and not use it as a set tru chuck, just leave it alone? The whole point in a set tru chuck is to be able to move it and not lose grip on the part

 

[Walt Krafft]

I have found that the set trues are like most other scroll chucks, they don't repeat when opened and closed. Close, but not perfect.