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PostPosted: Sat Apr 09, 2016 3:00 pm 
Supporting Member 2013

Joined: Wed Sep 14, 2005 8:47 pm
Posts: 1689
Location: 123 gun street Nova Scotia
so i have a few builds on the go . some very nice .30cals almost done , normally i work with tube that is thicker and threaded (.1'' wall ) but ive been testing my luck with thinner stuff . before blowing my self up i made a tester... with plan to make it fail , sloppy fit on all sections .the inner plug OD are under size by .005 and .008'' , one is aluminum one steel . the thread holes are drilled over size which id normally drill under size so there is better threads , also the end of the tube is rounded over and thiner :)
figuring id want to run around 2500psi -2800 , i ran the tester to 3500+ with only 2 bolts holding each end
(my guns have 4 @.25 and .7 from tube end and .3'' threaded )

got some pretty good belding at 3500psi the second time i pressurized it, the first time looked no different (pictures are after 3rd time going to 3500+psi. i fully believe at 4000psi and a 4th fill it would have blown . at 3000psi it had no change .

(this was done safe :) (picture should say .065wall ) one end .127 wall length , other .227. big difference in stretch )


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