Methods of Reducing Friction:
There are two different ways of reducing friction.
(a) The use of ball or roller-bearings.
(b) The use of lubricants like oil, air and graphite.
(a) Use of ball or roller-bearing:
In machines the sliding of various parts is usually replaced by rolling and this is done by using a ball bearing. Rolling friction is less than the sliding friction.
Use of lubricants:
The various parts of the machines which are moving over one another are properly lubricated.
The friction in different sliding surfaces can be reduced by putting fine chalk powder or any other powder or some liquid (oil) between them. The presence of dust or liquid keeps the sliding surfaces separated from each other and thus lessens the friction between them. This is the reason why oil, grease and air are used as lubricants. Air under high pressure is used as lubricant in tools used for precision grindings.
No comments:
Post a Comment