system

In order to shape metal by machine tools, the cutting tool should move in contact with the workpiece at certain specific points, while the workpiece or cutting tool is rotating.Coordinate system is required to define the movement on the machine.

1947: The transistor which is building block for all electronic devices was developed in the year 1947. After the invention of transistor here comes a new era in the field of technology. Before that almost all electronic circuitry were realized the need of vacuum tube

Vacuum tube->

1. It consumes more power
2. Large size
3. Low storage space
4. Low impedance input

Transistor->