1. Blade Grinder
This is a cheap device to grind your coffee that consists of 1 or 2 metal steel blades rotating at extremely high speed. The good side about it is that they are usually very low price between $10-$50 and can also be used for grinding other food including garlic, herbs, spices etc. They may be great for bargain shoppers, but we’re not so sure about grinding coffee for true lovers. Major brands include Krups, Capresso, Delonghi, Black & Decker and more.
How It Works?
Unlike burr grinders, the blade system functions by rotating the metal blades at really fast speed and the coffee beans are chop up into smaller and smaller pieces. The way to justify the size of the ground is to measure the time you leave the grinder to run. The longer you leave it to run, the finer the ground will be.
Here are some disadvantages for using this type of model:
1) It is almost impossible to get even cuts from using the blade grinding methods. That’s why these are usually for home use only, where brew and taste consistency is not really a big issue. It’s also the sole reason why you’ll find that no commercial cafe in your country will ever use a blade grinder to serve their customers coffee.
2) If you are aiming for smaller or finer coffee ground, you will tend to leave the blade grinder running for a longer period of time. This is not a good way to treat your coffee beans as it could result in over-grinding which could actually burn the freshly roasted beans, completely destroying the taste and aroma altogether.
3) Since the coffee beans are sliced, chopped or cut up unevenly, it has a higher potential of getting clog and you may also notice that these type of grinders produce more noise and makes more mess compare to the burr mill ones.