End Runner Mill / Mechanical Mortar and Pestle - Pharmaceutical Engineering B. Pharm Third Semester PDF Notes

End Runner Mill / Mechanical Mortar and Pestle


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


   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


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


Suitable for fine grinding


Not suitable for unbroken drugs

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