No. 1: The Grinder
Burr Grinders use two revolving abrasive surfaces or burrs to grind the beans, just a few at a time.
Blade grinders use a single centered blade to chop up beans progressively into smaller and smaller pieces.
No. 2: How It Works
Burr grinders take it slow(er), drawing the beans through the grinding mechanism a few at a time to deliver a uniform grind every time.
Blade grinders are aggressive little machines. They work at a high speed and have limited settings. Some may even overheat your beans, leaving unwanted flavors behind.
No. 3: End Result
Burr grinders offer far more control and a more uniformly consistent grind, enabling the water to evenly extract the flavor and create a noticeably better cup of coffee.
Blade grinders can be inconsistent and unpredictable, producing a varied grind.
With more control over the size and quality of the grind, you’re able to make adjustments depending on your brew method. Hence, why you’ll find a burr grinder in many coffee lovers’ homes, in each and every Starbucks® and most definitely in my kitchen.