Nick, some companies do hold the ball stack straight. Look at a Geo bolt system or a Cure2 bolt in an Ego.
You do contradict yourself. You say it is not related to the loader, or force on the paint from the loader, and then say that it is worse when the paint has been sat under load for some time in the gun. Surely the second comment only goes to show that it is in fact the loader and pressure on the paint stack that cause the breaks you see?
The fit in this particular test was slightly tighter than blow-through. I wouldn't call it underbored. The paint would often go in 1-2" before getting tight. You would generally have to push the ball out with a squeegy, but 1-in-10 would blow all the way through.
I don't want to give too much away at this point, but this "bounce" we saw was in an Ego.............
Unfortunately I didn't have a Geo with the same window cut in the side to do a comparison. But I have a suspicion that you would not see this effect on a Geo.............
Poe, the ball is bouncing. On the footage we did 2 weeks ago, we caught some rippling. We also caught that this time, prior to a barrel break failure. In the loader, we have not seen a ball that has broken hitting the bottom of the breech. After seeeing about 100+ loading failures, I did not see one single one where the ball cracked in the bottom of the breech. 90-95% of the loading faiures we saw, the ball was cracked IN THE STACK and fell into the breech already cracked. Some were very obvious, some had tiny fractures. The forces exerted on the paint in the stack prior to reaching the breech seem to be greater than this final drop into the bottom of the breech.
Odin, we shot some paint with some talc in the face of the bolt to see if we could determin where the air was going as the ball bounced. As the ball bounces, air does squeeze around the outside of the ball, quite clearly. What I connot tell you conclusively is whether the initial bounce that gets the thing going is due to a mechanical influence or pneumatic (power pulse profile) one. I suppose an undertow bolt in the same gun would tell us that. Gordon didn't send me any drawings so I could get one made
Definitely need to do it next time.
The ball is definitely compressing as it bounces. You can see it on the inside of the clear barrel quite clearly. As we were looking at it, it was easy to assume that this compression, combined with the shear force element of the contact, was leading to the failure. Is that the case? I can't say. It's easy to convince yourself of that looking at the footage, but then you look again, and maybe the failure occures prior to that, and the impact and shear are just the straw that broke the camels back. Let's see about getting some footage out in the next couple of days.
Bryce, I got the balls bouncing and breaking on a hard surface. Think you'll like them.