There’s something about making a cup of coffee that riles people up. Somehow, each debate breeds its own sub-debates — brewer vs. pour over. Hario vs. Chemex. Medium grind vs. coarse grind, and so on.

That’s why coffee grinders are so great. You can grind as much (or little) as you need, and enjoy all the flavours and aromas the beans have to offer since they haven’t been exposed to air just yet.

Grinding, or abrasive machining, once performed on conventional milling machines, lathes and shapers, are now performed on various types of grinding machines. Grinding machines have advanced in design ...