Burrs are the sharp, serrated edges that grind coffee beans into a uniform size for coffee brewing. There are two main types of burrs: conical and flat.
Conical burrs have a cone-shaped design, with one burr rotating inside the other. Flat burrs, such as the burrs in the Moccamaster KM5 coffee grinder, have two flat, parallel surfaces that move closer or further apart as you adjust the grind setting. Flat burrs typically produce a more consistent particle size than conical burrs, resulting in a more even extraction. Flat burrs also generate less heat than conical burrs, preserving the coffee's flavor and aroma.
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