A coffee grinderCoffee Grinder is the name used for a mill to convert the bean into a powder. In fact the grinder "tears" coffee more than it grinds it, when... 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 are inexpensive, but this comes at the expense of accuracy: grounds from a blade grinder are substantially less even than those from a 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.... Still, they are durable and when paired with the right brew method (especially those that use paper filters) they are quite acceptable. Don’t knock the blade mill! It keeps people grinding coffee fresh, right before brewing, which makes a huge difference in the coffee aromatics.