True Bore Alignment System

[Addley]

Alex

There's 3 problems with flexing a barrel to get it dialed. One is that some cartridges are long enough that the flex is in the chamber. Another is if you index barrels the flex will fool you as to where to point the barrel. But the most important one is that when your flexing the barrel its fighting the setup and when you start putting cutting pressure on it its far more likely to more during the process. The barrels should not be moving. So if you’re checking your work and finding you need to dial out a tenth or two after threading for example you have a problem. Most likely flex in the barrel is the issue as well as sacrificial metals like a copper ring in a 4 jaw. Thats a recipe for movement. Now I know someone will ask how much all this matters. I dont know and dont care. Im charging the customer to do the job to the best of my abilities, so thats what I try to do. For the hobby guy, this probably is not an area to fuss over too much.

Alex. What is the best way to chuck and line up a barrel for chambering?

 

[DSMWerks]

I keep getting Proof Research Carbon fibre barrels to chamber and I make sleeves to protect the barrel from the spyders. I started reading through this thread because the jaws will work good only holding on to the steel section of the carbon barrels. This system seems awesome all around but there is some who dont like the idea of added weight and length. I see someone used a 16C collet chuck. So why not an ER50 collet chuck? You can get one that is 4" dia and 2.5" tall and on Ebay for $50. ER50 collets that are 1.2-1.25 range have 2.5" length of engagement. Much shorter and way lighter than a 6 jaw chuck. I'll go get my flame retardant suit on now

 

[WSnyder]

So why not an ER50 collet chuck?

And you are adjusting it how? As in what’s your plan for how you will accomplish dialing in a barrel in with it???

 

[DSMWerks]

Well if you attach this collet chuck to the TBAS in the same way you bolt a 6" six jaw chuck it will be 25-30 lbs lighter and 3 inches shorter and use the TBAS just like normal. If you can chamber a barrel putting three bolt holes in it shouldn't be to hard.

 

[DSMWerks]

I just checked my Bison 6" adjust tru and the jaws are 1.30" tall that contact the barrel. An ER50 collet contacts 2.5" long so I like that idea better too. Most barrels only have so much straight diameter but the more the better right?

 

[WSnyder]

Well if you attach this collet chuck to the TBAS in the same way you bolt a 6" six jaw chuck it will be 25-30 lbs lighter and 3 inches shorter and use the TBAS just like normal. If you can chamber a barrel putting three bolt holes in it shouldn't be to hard.

Gotcha. Wasn't clear (to me) that you were putting it on a TBAS.