A conical burr grinderA coffee grinder that grinds by passing a flow of beans between a pair of rotating metal discs.: A coffee grinder that grinds by passing a flow of... ...more has two cone-shaped burrs that sit inside one another; coffee bean fall between the two burrs and are ground between them. Produces a much more even grind than a whirly blade grinderA coffee grinder that works by way of a high-speed rotating blade.: The standard home coffee grinder, which works by way of a high-speed rotating blade. Blade grinders... ...more. Conical burr mills are very even at medium and fine grinds, less so at coarse grinds. The mill can be electrical or cranked by hand. The blade grinders bash coffee into pieces but a burr “tears” the coffee to a certain size where it should then fall through the gap set between the inner and outter burr.
