Mechanical Operations
Bond crushing law

Calls for relatively less energy for the smaller product particles, than does the Rittinger law
States that the work required for the crushing is proportional to the new surface created
Is less realistic in estimating the power requirements of commercial crushers
States that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product

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Mechanical Operations
In case of a hammer crusher,

Maximum acceptable feed size is 30 cms
Crushing takes place by impact breaking
All of these
Reduction ratio can be varied by adjusting the distance from cage to hammers

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