BEARING HISTORY

BEARING HISTORY Hundred of years ago, when man lacked strength and endurance to carry loads, such heavy loads to be transported were put on simple skids and dragged to the place of destination. The dragging heavy load on dry ground requires considerable force. These forces can be reduced by using lubricants between the sledge runners and the ground. This lubricant-probably water – was poured to reduce the friction and thereby reducing the volume of force. As the time passed on, these forces were further reduced when man learnt to insert wooden rollers between the ground and the object. THUS SLIDING MOTION WAS CONVERTED INTO ROLLING MOTION, which is the basic principle of bearing. However, things were not much changed for years, till the concept of BALL was conceived, as the application of rollers was not practical everywhere. In 17th century, stone balls were produced and were in use for variety of applications to minimize the friction. Since the stone balls were not suitable for many applications, cast iron balls were also produced, but that was also not suitable. In 19th century, the concept of steel balls was conceived and steel balls were produced. During this era, on lathe machines, balls of remarkable accuracy were cut off from a steel rod and the ends were machined to form a sphere. At the end of 19th century, balls manufactured by this method in England were within the tolerance of 0.025 to 0.050 mm. In the year 1883, Friedric Fischer, instrument maker in Scheweinfurt – W. Germany, after numerous experiments, developed a method of grinding wheel balls, turned between the centers on the centre less principle. For this purpose, he designed ball grinding machine called “BALL MILL”. In 1898 taper roller bearing unit developed in USA by H. Timken. During 1913-1914 Roller bearings were put on use.