Barrel Vise near the muzzle...

E

eww1350

Guest
I think I read where Shelly or Gene stated that set screws on a tuner created a "pinching effect" and the rifle did not shoot untill the set screws and pinching was relieved...
My question is, that when I use my barrel vise to remove the barrel that has about 100 ftlbs of torque..I have to really tighten my barrel vise to keep the barrel from slipping...does this have a lasting "pinch" effect on the barrel..?
 
eww

No. The barrel will return back exactly as it was before you placed it in the vice. If there was some way you could exceed the steels yield strength, it would not. But you are not going to do that with a barrel vice.
As for pinch bolts on a tuner, that is another reason to use a very fine thread with two inches of length. The two 6-32 Socket Head Capscrews I use on my tuner need to be tightened just a little, and you can't move the tuner. It really doesn't take much at all.
As an experiment, I took a piece of barrel drop and threaded it for a tuner. I inserted the snuggest fitting Deltronic pin possible. (my set is in .0001 increments). I then screwed one of my tuners onto the threaded barrel drop and tightened the screws to the point of either stripping the threads or snapping the bolt. The pin never got any tighter.
Of course, you can't transmit much force with two 6-32 bolts in a piece of aluminum that isn't even 1/4 inch thick. But it satisfied me that there was no way I could close the end of a barrel with my tuner under normal conditions.
I would think that tightening two nuts together would ne more likely to close a bore than two tiny screws. When you tighten a 60 degree thread, it does impart inward and outward force.
But it would probably take such an amount of torque on the nuts that this would be considerd a non-issue as well.........jackie
 
Jackie thanx for sharing that test. I don't have the Deltronic pins but thanx to you and Wilbur I now have the information without the expense ;)




thank you



al
 
Jackie

I'm not sure of anything when it comes to pinching the muzzle. But, I have tightened things at the muzzle and had undesirable things happen.

Here's a completely un-proven theory: I think (or maybe I dreamed it) I've seen photos that show that the barrel swells a tiny bit as the bullet travels down it. Something that is tightly pinched around the muzzle may prevent the barrel from swelling/reacting to the bullet in the same manor as a naked barrel would. I've always thought that the above theory may be why a rail gun barrel seems to do better when blocked in Delrin (which has more elasticity or give) instead of being tightly pinched in an aluminum barrel block. Your attempt to pinch a Deltronic pin wouldn't achieve any usable results if the swelling thing was what's the cause of pinching problems.

In my own experiments, I've seen no adverse effects to lightly pinching a tuner at the muzzle. I have tried muzzle attachments with pinch bolts and got copper fowling at the muzzle if I got the bolts really tight and the copper fowling disappeared when the pinch bolts were loosened. That could all be coincidence but....... who knows.
 
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