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what is the stupid point here ?
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To duplicate , within reason, the forces that will be applied to the turret(s) that the fittings screw into when 7/16' tubing is put on the 1/2" fittings.
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why not a 36" arm ? or 72" ?
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75 or 150 ft-lbs is a little excessive, ie not realistic.
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and now you move to the acrylic wbs of the world ?
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Not sure what you mean, but they are not sold with 7/16" tubing included in the kit, and any one buying acrylic accepts the risk of a brittle material.
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what saftey factor do YOU want ?
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Personally, I don't care because I'm not interested an Apogee. But I think being assured you could install and remove the tubing 10 times without cracking would be a minimum "saftey factor". By my test 50 reps /joint at 50 ft-lbs would be impressive, as I said 25 ft-lbs would be sufficient. Swiftech hasn't shown any safety factor, the tests refered to by swiftech in no way duplicate the loads that will be applied in use.
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what is the relation of that to the procedure you defined ?
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Not sure what "that" refers to, maybe I already answered it.
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what is the max possible bending load imparted through 2 flexible hoses ?
shit, hang the computer off them; add for dynamic loads (dropping the computer on the barbs ?)
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Not worried about either of those loads, are you?
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torque ? with an NPSM thread ?
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I was not refering to the force relating to sealing the O-rings. Not worried particularly about stripping out the threads or twisting the turret out.
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go to ignorantcooling.com
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Sorry, can't find it BillA. I guess I'll keep looking for answers here.
As you view the picture insert the bar into the threads. If you want to take the time, thread the bar and screw it into the threads. Apply the force left to right. If the delrin bends in the circle it will crack at the corner. This test will apply the same forces as rocking tubing onto the fitting that is normally screwed into the threads. 25 ft-lbs is more than I can apply (lever arm is a couple of inches, forces higher) but not as excessively showy as a vise or hammer blow.
I'm not the one that came in talking about how it met specs., and then testing with hammer blows
Frankly Bill, I'm disappointed in you. I thought you were all for appropriate testing.