10-16-2018, 11:28 AM
"I find Mr. Mike to be an irritating fellow at times." If my wife had been the author of your post Grepper she would have just finished right there. Thank you for the encouraging words, at least the ones I was able to find in the dictionary. So if you don't mind, I'll try to explain my poor behavior and contrary nature.
No matter the industry or craft, our activities seem governed by conventional thinking and wisdoms. That's how we learn and the more experienced teach. The wife and I were out at a Mexican style restaurant last night and the waitress set down the next table's order. The waitress admonished the couple "Careful. The plates are very hot." The male half of the couple had touched his plate with his finger before the waitress had finished setting down his wife's on the table. He grimaced, shook his hand and looked at his wife, "That's hot!". The waitress and wife exchanged knowing glances and shook their heads. I'm afraid that, that guy and myself, share some DNA. Yes, I know what you're thinking but consider this; the waitress said that the plates were " very hot". Is that hot like a hot tub or hot like an exhaust manifold? Now he knows. It's somewhere in between.
Which brings me back to overheated edges. Even our young waitress understands the principles and most easily measured effect of friction. Things can get hot. Who hasn't seen a lawn mower blade turn blue while using a bench grinder? Very bad. But wait, blue simply means that the steel went to 550°F and that's not the end of the world hardness wise. Spring steel is tempered around 700°F and it's not exactly soft. Particularly if you ever tried to drill a hole in it. Grinding steel is going to produce heat but how much heat? If it gets hot, how long does it stay hot? Does it make a difference how long it stays hot? If it gets hot and stays hot does it affect hardness just a little or a lot? Does introducing water to the process in one way or another actually help? It might seem that it would but then again underwater blow torches work just like above water blow torches.
Lot's of questions. Let's touch the plate and see if we can come up with some answers.
No matter the industry or craft, our activities seem governed by conventional thinking and wisdoms. That's how we learn and the more experienced teach. The wife and I were out at a Mexican style restaurant last night and the waitress set down the next table's order. The waitress admonished the couple "Careful. The plates are very hot." The male half of the couple had touched his plate with his finger before the waitress had finished setting down his wife's on the table. He grimaced, shook his hand and looked at his wife, "That's hot!". The waitress and wife exchanged knowing glances and shook their heads. I'm afraid that, that guy and myself, share some DNA. Yes, I know what you're thinking but consider this; the waitress said that the plates were " very hot". Is that hot like a hot tub or hot like an exhaust manifold? Now he knows. It's somewhere in between.
Which brings me back to overheated edges. Even our young waitress understands the principles and most easily measured effect of friction. Things can get hot. Who hasn't seen a lawn mower blade turn blue while using a bench grinder? Very bad. But wait, blue simply means that the steel went to 550°F and that's not the end of the world hardness wise. Spring steel is tempered around 700°F and it's not exactly soft. Particularly if you ever tried to drill a hole in it. Grinding steel is going to produce heat but how much heat? If it gets hot, how long does it stay hot? Does it make a difference how long it stays hot? If it gets hot and stays hot does it affect hardness just a little or a lot? Does introducing water to the process in one way or another actually help? It might seem that it would but then again underwater blow torches work just like above water blow torches.
Lot's of questions. Let's touch the plate and see if we can come up with some answers.