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Carbon Barrel cracked??
- Thread starter LRTalley
- Start date
We also do reverse muzzle tapers. Like a Anshutz type muzzle. So for example we do a #2B contour with a .600 muzzle normally but then put a reverse taper on the muzzle. Looks like a mini breech end of the barrel type look… So like from .600” to a 45 degree taper up to a .700 or .750” diameter for a couple of inches so you have some meat to thread the muzzle for a suppressor attachment etc…
Apropo of nothing, here's a rando vid (re: cryo treatment) on how Krieger does their barrels.
Extreme cold shouldn't necessarily affect a well-done carbon fiber wrap based on aero and space applications.
Extreme cold shouldn't necessarily affect a well-done carbon fiber wrap based on aero and space applications.
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Alot more meat around bore and chamber area, comparing 7prc to 223. Also a skinny barrel can have a taper left at muzzle threads to act as a shoulder. I've had several pencil barrel ar pipes that were .560 dia in front of gas block and then flared out to provide shoulder for muzzle threads.
Carbon fiber space parts, such as cryo fuel tanks are 100% carbon, not steel wrapped in carbon.
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Unless something has changed.... Krieger hasn't been cryo'n steel for several years now.
THIS.
we all learn hard lessons though, and honestly, this isn't even that bad.
please tell us what company told you they could do this, inquiring minds want to know.
Doesn't sound like a good idea.
With dissimilar materials bound tightly together. It would seem logical that when the temperature comes back up the steel would expand faster than the carbon wrap, cracking it.
It would still be safe to shoot, it would seem, but cracks would change the harmonics of the thin steel barrel beneath, most likely in a negative way.
Tight wrap and spaces in wrap, would wreck the tuning fork.
Sounds like scrap barrels, to me.
Have to shoot em to see.
With dissimilar materials bound tightly together. It would seem logical that when the temperature comes back up the steel would expand faster than the carbon wrap, cracking it.
It would still be safe to shoot, it would seem, but cracks would change the harmonics of the thin steel barrel beneath, most likely in a negative way.
Tight wrap and spaces in wrap, would wreck the tuning fork.
Sounds like scrap barrels, to me.
Have to shoot em to see.
Wrong. This is what happens when people who know nothing about materials play amateur metallurgist and pay for thermal processing without understanding what's going on.
Same as having shit nitrided with no understanding of the initial and final metallurgy.
This depends in some part on the geometry of the bonded parts especially the metallic one and the stresses imposed on the CF.
Is the CF wrap bonded to the barrel at the ends? If so the wrap will be subject to axial stresses as the barrel changes length as well as diameter during contraction.
Don't those tanks have metallic fittings for pipe or hose connections?
Agreed. One note is that regardless of the the CF being bonded or not at the ends it will be subject to axial stresses. The bonding area along the length is still changing length as temperature changes.
Completely different applications. In my experience, CFRP parts that are being put in space, especially for optical instruments, have laminates that are specifically designed for a certain CTE or even zero CTE. This allows the laminate to move along with whatever other hardware is needed throughout the temperature swings seen in those environments.
I'm not sure the amount of engineering that goes into carbon wrapped barrels but using aerospace applications of the material as a litmus test for carbon wrapped barrels is probably misguided.
Sound reasoning, though a smith can custom machine a larger diameter permanent "adapter" to allow for larger threads/shoulder and be perfectly concentric. Just another way to skin that cat, and less expensive than the cfw.
