The uniform particle size achieved using a coffee grinder can be desirable for coffee preparation.
However, some methods of brewing may be more tolerant of the range of particle sizes produced by a blade grinder; this may be the case for percolated coffee.
Regardless, burr coffee grinders are more suited for keeping the flavor and aroma of the coffee beans intact.
This is because burr mills produce less heat from friction compared to blade grinders;[citation needed] this is especially important for coffee aficionados looking to get the most flavor from the freshly ground beans, as heat from friction lessens or taints the natural flavor.[
Burr grinders create less friction and require lower motor speeds, which reduces potential flavor loss due to heat.
Burr grinders obtain these lower speeds through two mechanisms.
The lower cost models generally use a small electric motor to drive a series of reduction gears, while better constructed and more costly examples use a larger commercial motor and a belt, with no gear reduction to spin the burrs.
The latter example is termed “direct drive”.
The reduction gear versions are noisier and usually do not have the lifespan of the direct drive units.
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