Unsung hero !

A machine can be disassembled into various parts. The gear is one of the parts which cannot be further disassembled. Many kinds of gear exist and here you can find 5 types of gears.

  • What an old history!

    The gear has a very long history. One theory says that the wooden gear has been used since ante-Christum in Greek and Egypt as a machine to draw water.

  • Nature of gear

    The gear surely comes back to the original position after a rotation. As gear works "certainly" and "reliably," it is used in many parts of the precision machine.

  • Where is a gear hiding?

    Do you know a gear design is incorporated in something you daily use? Look at the front center of 5 yen coin made in 1949 and after.