Chambering a Carbon Wrapped Barrel

[tonyb]

Just a quick question for those with experience. I am getting ready to chamber my first Proof barrel, and was wandering if anyone had any advice they could spare. My concern is damage to the carbon surface during the dialing-in process with the jacking bolts on the spiders at either end of my headstock. I am using 1/4" brass tips on my current bolts. Do I need to make buttons of some type or will these bolts still work ok as long as I don't get too aggressive with the tightness.

Thanks in advance,

Tony.

 

[shortgrass]

You can not apply any pressure with jacking bolts (or pads) or chuck jaws on the carbon fiber wrap. All 'clamping' has to be on the steel.

 

[Jesse Gietzen]

the chambering guys at proof are using steel jaws clamped down hard on the tang. at crown, it's three hardened steel ~3" length by ~1/4" width flat jaws clamped directly on the carbon fiber and with a cheater bar on the t-handle. i've never seen any crush damage, only damage from the barrel slipping from not being tightened enough during a lathe "oops."

 

[eww1350]

I use thick hobby sheet aluminum ( .060" thick) cut and wrapped around the barrel any place I need to capture the barrel in my 4 jaw chuck and the spider screws on the outside of the headstock.. I have chambered several of them with no damage to the carbon fiber wrap..

 

[Alex Wheeler]

I dont do anything different. I never put any pressure on with the outboard spider anyhow.

 

[X Ring Accuracy]

I dont do anything different. I never put any pressure on with the outboard spider anyhow.

Amen

 

[NINERUN]

I made a few black acetal collets and can clamp the chuck on them.

 

[alintx]

And if it does get scratched just hit it with sand paper turning in the lathe. Cleans right up