Many probably had to watch as the metal is heated during processing it on an emery wheel. The phenomenon is harmful: heating “releases” hardened metal. Is it possible to turn it to their advantage? Well, for example, to cut metal? For the experimental verification of the idea took only an hour and a half I’ve ground off the teeth from an old circular saw blade and secured the tool (smooth disc) is grinding in elektrotochilo.
Pressed “start” button, the disc began to spin. I brought to him the steel area. Here he touched the disk, there was a creaking, screeching, after a few seconds the billet in contact with the disk is warmed up, there appeared a luminous dark red dot, she brightened, turned into orange, and then I felt that the disk cuts into the metal. Passed the first millimeter of a second,… fifth Nagging! Saws absolutely smooth drive! Sound bounced off-cuts, I stopped the motor. I wonder how much hot drive? Touched it hand: the drive was a little warm, well, except a little warmer than the air in the room.
And what if to try to cut other materials? In the course went all that was at hand: aluminum and glass, ebony and Micarta, wood, and tucked a piece of file — everything was subservient to my drive. Particularly interesting were cut glass: it is quickly heated at the point of contact red-hot, melted, and only then cut. Same hardened steel (piece of file!) cut hard enough, and as for the aluminum, handle it this way was easy and simple.
After finishing the experiments, I tried to make sense of the phenomenon. What is my tool? Yes, obviously, the same circular saw, but with a huge number of vanishingly small teeth. True, it works a little differently: his main task is to heat the metal at the contact point, to thereby bring it up to a plastic state and extrude poluraspredelenia “dough” of the cut groove.