Blade grinders are very popular because they are cheap, simple, efficient and they also don't take up much space.
The main problem with the blade coffee grinder is that they do not actually grind the coffee - they smash it to pieces with a blade that rotates at high speed. This way of pulverizing coffee beans produces coffee particles of varying sizes - ranging from big chunks to very fine dust.
This non-uniform grind is pretty OK if you are using a paper filter. with metallic filters, a French press or a Moka pot you are likely to end up with quite a bit of unwanted sediment in your cup. The lack of uniformity will also impact the flavor of your coffee: the small particles will be over-extracted and the large ones will be under-extracted (no, it does not even out).
With the blade grinders there is no way to adjust how fine you want your coffee to be. You simply grind for a while then look if the coffee is fine enough and if not then grind a bit more and so on.
Blade coffee grinders also heat the coffee up considerably while grinding it. That destroys some of the coffee flavor. The grinding is rather noisy. another issue is that the coffee ground in a blade grinder is likely to be full of static charge which makes handling it difficult and messy.
To reduce these problems it is best to grind the coffee in a series of short bursts (only a few seconds at a time) and to shake the grinder vigorously in between the bursts.
Having talked about the bad point of the blade coffee grinder, let me just emphasize that using a blade coffee grinder is still much better than buying pre-ground coffee.
What Can a Coffee Grinder Do For You
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