End Runner Mill / Mechanical Mortar and Pestle
Principle
Size reduction is done by crushing or compression due to
heavy weight of steel pestle. Shearing stress is also involved during the
movement of mortar and pestle
Construction
• A steel mortar is
fixed to a flanged plate
• Underneath the
flanged plate, a beveled cog fitting is attached to a horizontal shaft with a
pulley
• Dumb bell shaped
pestle is flat rather than round
• The pestle carries
a hinged arm for emptying and cleaning
Working
The material to be ground is placed in the mortar
The scraper puts the material in the path of the pestle
The mortar revolves at high speed
The pestle is placed in the mortar
The rotating mortar causes the pestle to revolve
Thus size reduction is achieved by shearing as well as
crushing
The material is collected and passed through a sieve to get
the powder of desired size
Uses
Suitable for fine grinding
Disadvantage
Not suitable for unbroken drugs
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