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Generator
In article 832848077378768544.156850bmckeenospam-
, says... iBoaterer wrote: In article 1444394091378758162.549500bmckeenospam- , says... iBoaterer wrote: In article , says... On 12/31/2012 5:44 PM, Wayne.B wrote: On Mon, 31 Dec 2012 15:23:44 -0600, Califbill wrote: The fix is not stronger than the base metal, but there is more base metal involved. Therefore the fix is stronger. === Sounds right to me. The heli-coil is bigger than the plug so it has more contact area (gripping surface) with the aluminum head. All other things being equal, it should be stronger than the original. What I have been saying all along..  You are wrong. Once again, the base metal THICKNESS has not changed. the base metal thickness is what gives it X in tensile strength (or compressive strength for that matter, although here we are strictly in tension) Okay, now there is a cone of influence DIRECTLY proportionate to the thickness of the base metal. You only WEAKEN that base metal by enlarging the whole. The perfect cone of influence is a 45 degree angle, conical of course. IF that cone of influence doesn't fully develop because of a lack of thickness of base metal, then it's weaker than it could be. I doubt you and your dummies will get it, but I'm sure Wayne will. OK. Use this example. You use a 10-32 screw in a sheet of metal. Does not matter what material really. How much force to pull out that screw is required? Now, same piece of base material. Drill and tap for a 4"-32 screw. Install screw. How much force required to pull that screw loose? You should not make big bets without knowing the odds. Same principal if you welded on a pad-eye and increased the size of the pad. Takes more force to rip it loose. You stupid old fool!!!! What *I* said was that the fix is NO STRONGER THAN THE BASE METAL... But, I WILL take the bet. What you are failing to understand, or know, or whatever, is the CONE OF INFLUENCE. Do some reading. And yes, it certainly DOES matter what the material is. Do you really think that the above screw would have the same tensile pull resistance in pot metal or case hardened A325 steel??? I guess then it would have the same resistance in plastic, too? Now, to your above example. What you are failing to grasp is that the base metal has a given shear resistance strength. That strength is DEPENDANT on the thickness of the threads. We know the threads per inch count is the same, therefore the tensile resistance is the same. You are confusing the bolt properties with the base material properties. What you are showing in your ignorance, is sure the base metal is the same and the thickness is the same. But if you had a 1/4" bolt, you would have to pull out Pi x 1/4" of metal the thickness of the threads. BULL****!!!!! YOUR ignorance is not knowing the fundamentals of tensile strength of the base metal. Again, I don't give one little **** about the threads. THAT is where you are stupid, I never said anything about thread strength. I said that the base metal is what it is and it is only has X amount of tensile force resistance. Then if you go and drill a hole in it, the cone of influence now comes into play and unless the base metal is thick enough to allow the cone of influence to widen to a point equal or greater than the diameter of the hole it will only weaken. The bigger the hole, the weaker. With a 4" bolt you would have pull out over 12" of metal the thickness of the threads. If it did not matter what the diameter of the screw was, you could always use the smallest screw possible. You must not have a mechanical engineering degree, or even be technology trained. You definitely do not have any common sense. |
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