A spice grinder works by placing the spices into the grinder's container and then starting the machine, causing the grinding components inside the container to start rotating or vibrating. These grinding parts are usually made of hard materials, such as metal or ceramic, which rub and collide with the spices.

As the grinding components rotate or vibrate, they crush, grind, or blend the spices together. This process can be achieved in a variety of ways, such as cutting, impacting, shearing or compressing.

Grinders often have different settings and control options to adjust the speed, strength, and duration of grinding. This allows the machine's operating parameters to be adjusted according to the specific spice type and desired fineness.

Once the spices have reached the desired level of grinding, then can stop the machine and remove the ground spices. These ground spices can be used for cooking, seasoning, or perfume making.

Spice grinders grind spices into the required fineness through rotating or vibrating grinding parts to achieve processing and mixing of spices.