An ideal coffee grinder produces ground particles of a consistent and correct size. By this we mean that the size of the ground coffee particles should match the grinder’s coarseness settings, whether fine or not. The size of the beans produced must also be appropriate for the intended brewing method, as described in the product manual.
To test each grinder for our coffee grinder reviews, we first hand wash and dry all parts recommended by the manufacturer. We then set each machine to the appropriate grind level for drip coffee or automatic coffee makers (again, as described in the manual). Sometimes the guide lacks specific directions. In this case, we choose the medium coarse grinding setting, then raise it to another coarse level (from a fine grind, such as an espresso grind, to a coarse grind). For example, if a grinder has 16 total coarse grind settings (assuming 16 is the coarse grind option and 1 is fine), we would set it to level 9 for coarse grind.
Watch this: Five things to know before buying a coffee grinder
Next, we weigh 10 grams of whole coffee beans to grind. By default, our test beans are Kirkland Roast Colombian. It’s the same beans we use in our coffee maker tests. (No judgement, please.) When you grind as much coffee and espresso as we do, it pays to be frugal.
Then we pass the bean sample through the grinder. We also note how long it takes the grinder to grind the coffee beans. Next, we carefully collect the powder, then sift it using a double-screen sieve for 60 seconds. For this we use Crovy screen system. Our original Kruve Two comes with two mesh screens with different aperture sizes (800 and 400 microns). This step allows us to measure the grind size and grind consistency of our sample. the Cruff base It now replaces the Kruve Two and offers five retina displays (300, 500, 800, 1100 and 1400 microns).
We used a Kruve coffee sifting system to ensure consistent grind size.
An electric coffee grinder or premium manual grinder will produce grinds, preferably with stainless steel blades, that have a particle size of mostly between 400 and 800 microns (at our chosen grind settings). Finally, we weigh the soil that collects between the two screens (800 microns at the top, 400 microns at the bottom).
A bad grinder will grind particles of different sizes, from large to small. Blade grinders are notorious for this problem. Unlike a blade coffee grinder, a coffee grinder with steel or ceramic burrs usually produces a more uniform grind in grind size.
In addition, we grind at least two more times. From there, we can record the average optimal yield for each mill.
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