On Friday 02 August 2019 08:59:44 Stuart Stevenson wrote: > Gentlemen, > I found this on the floor in my office this morning. It was sitting > in the corner on a shelf behind a toaster and a coffee pot. Both the > toaster and the coffee pot - and one half of this was on the floor. > One half was still on the counter. > > https://ibb.co/jVMynzX > https://ibb.co/bHtkdxm > > The links are two pictures of this item. I have never seen anything > like this before. I have had this for approximately 15 years and used > it a lot. How in the world would it split in half like this now? > > thanks > Stuart
Stored stress from the original cooling, plus the temp cycles from the nearby coffee pot if it was in daily use. Eventually might make a fatigue crack. Each heating and cooling cycle that does not get hot enough to anneal the stress out of it, builds up a fraction of a % more until it lets go. I've heard of bolt rifle receivers doing that if hot loads have been used for most of a century. But my Eddystone P17, on its 6th barrel and a century old now, this time an SS 6.5 Creedmoor, but two 30-06's and 3 Ackley Improved's preceded it, is still going strong. Someday, though since its fired at least 10,000 60 to 62 kpsi loads already, its always in the back of you mind as the trigger finger gives its final twitch. Designed for a little over 50 from the std mil spec load, but Ackleys are generally accuracy happier at the higher pressure. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
