A hammer mill is a size reduction machine that works by using the impact mechanism of hammers to break materials down to a smaller size. It consists of a steel drum containing a vertical or horizontal rotating shaft with 4-5 hammers made of stainless steel. The lower part of the hammers contains screens that allow size-reduced material to pass through into a collection container below while the hammers rapidly impact and break the incoming material fed through a hopper. It provides rapid grinding action for hard particles in a compact space but can produce heat, sound and is not suitable for fibrous materials.

1. HAMMER
MILL
It is a size reduction
machine .

2. PRINCIPLE :-
The principle of hammer mill is based on impact mechanism .

3. CONSTRUCTION :-
A hammer mill is essentially a steel drum containing a vertical or
horizontal rotating shaft .
The shaft contains 4 to 5 hammers .
Hammer are made up of stainless steel .
The lower part of hammer consist of screen through material can
pass after size reduction .
The material is collected in container placed below the screen .

4. WORKIN
G :-
o Enter the feed in hammer mill through hopper and start hammer mill .
o Due to impact particle size reduced .
o After reduction of particle fall on receiver through screen .

5. ADVANTAGES & DISADVANTAGES
Advantages :
1. Rapid action in grinding
2. Useful for hard particles .
3. Easy and fast in use .
4. Less space required for set up
.
Disadvantages:
1. Sound produce .
2. Very heat produce , can effect
material .
3. Can not use fibrous material .

6. APPLICATION:-
1) Non – abrasive to moderately abrasive materials are size reduced .
2) Cakes , slurries , ointments filter press cakes can also be milled .