Lathe Bit

the household can opener?

hand held

explain its uses and the different types?

how is it developed?

what are its predecessors?

what makes this device work?

what are the scientific principles behind this technology?

what is the science that makes this technology function?

http://answers.yahoo.com/question/index;_ylt=AoPz5kcGwJHzMdKlP8HOQoHty6IX?qid=20070310112744AA61s5e

About all I can add is that the "original" household can opener was a sharp blade spaced a few mm from a bar fulcrum, all on a handle about 10 cm long. the initial puncture of the can lid was accomplished by driving the point through the lid with a sharp rap on the end of the handle. the lid was then cut through by "jacking" the can opener around the can, and actually cutting through the metal with the knife edge of the blade.

Later, the "butterfly" opener was developed, so named because it had a bar which pivoted on the body of the opener, and a serrated wheel with a crank resembling butterfly wings. A bar fulcrum about 2 cm from the center of the wheel and bar prevented the opener from "rolling out" of the can. The bar was fairly thick and had a point more like a lathe bit than a knife blade. Still later, handles were added to increase leverage.

What makes the can opener work is the principle that, with a sharp enough point and a way to apply enough force to it, you can pierce or shear through any known metal.

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