The Conical Burr Coffee Grinder : Get your coffee one step closer to perfection
Conical burr coffee grinders
Conical burr coffee grinders - What's that? Do I need one? Where can I get one?
Although acquiring your very own roasting machine or espresso machine may be a little too ambitious for most of us, you may decide that bringing your coffee at least one stage closer to perfection by grinding the beans yourself is probably a good idea.
Coffee Grinders are an absolute must have for any coffee lover. Grinding your coffee just before you use it allows you to taste it with its complete aromatic profile. The best coffee you've ever tasted is maybe just one step away.
Coffee beans, like any other food product, will oxidize when exposed to air after a given period of time. The coffee grounds, having a much greater relative surface area than the bean, and no outer protection, suffer this effect even more so. Therefore, the ultimate coffee experience comes from grinding the beans just before brewing: it produces the least amount of exposure to air, and therefore produces the freshest grounds.
About the grind
Different sized coffee grounds are required by different coffee makers. An espresso machine requires the finest ground coffee. Drip / filter machines require medium grounds and, due to its relatively large-holed filter, a French press (Bodum) requires very coarse grounds. At the time of brewing, the finely ground coffee has more surface area in contact with the water. That means that by using finely ground coffee, you will be able to extract the same full flavor that you would normally get from a large portion of coarsely ground coffee.
But over extraction occurs when grounds come into contact with too much water. French press requires a coarse grind because the coffee steeps for up to 4 minutes. An espresso machine requires a fine grind because the equipment is designed to force a small amount of pressurized water through the grounds for less than 25 seconds.
A good grinder will produce grounds of a consistent and accurate size without too much friction. If you choose to invest in a coffee grinder, pick the best you can afford.
Coffee grinders fall into three broad categories - Crusher, Blade and Burr.
The Crusher Coffee Grinder
This is some kind of a mashing device, often an ancient-style mortar and pestle, that crushes the coffee beans. It is usually hard to use, and it produces very uneven sized granules, that produces uneven flavor extraction as the water filters through the grinds.
Not really recommended.
The Blade Coffee Grinder
The blade grinders don't actually grind at all, they chop the coffee beans. A whirling blade slices the beans into smaller and smaller chunks, until they approach a size similar to that of a small grain of sand or salt. Unfortunately, the coffee grains will normally be of uneven sizes. As a consequence the surface areas of the granules vary, releasing varying amounts of flavour oils when brewed.
Another effect of slicing is the production of excess heat as a result of the high speed of the blades (20 to 30,000 rpm is typical). The heat is the nemesis to the flavor and aroma of roasted coffee beans. It accelerates the chemical reactions that lead to a loss of coffee flavornoids, partially dissipating the flavor and aroma. And the friction is prone to burn the coffee grounds, giving the coffee an undesirable taste, such as being more bitter or with a burnt flavor.
Only buy a blade grinder if :
- you will not be making espresso.
- you are not prepared to spend more money on a burr grinder and you're in the "blade or nothing" case. Any fresh grind is better than buying pre-ground.
Some Blade Coffee grinders
This is the grinder I had before I bought the Breville (see the conical burr section, below). It is doing a good job, the motor is strong and I never had any problems. It now serves as a spice grinder. It is also available in white.
If I now had to buy a blade grinder, that's the one I would try. With a removable grinding chamber and a wide opening lid that should allow for easy pouring. Interesting to me is the Chamber Maid Cleaning System that cleans grounds from the chamber walls.
The Flat-plate or Wheel Burr Coffee Grinder
These grinders work by crushing the beans between two discs or wheels, one spinning and the other being stationary. The burrs still spin very fast (10 to 20,000 rpm), generating heat, but create a thorough and consistent grind, well-suited for use in an espresso machine.
The Conical Burr Coffee Grinder
The conical burr grinder is preferred by real coffee aficionados. Good conical burr grinders can rotate their plates as slowly as 500rpm. This obviously allows very little heat to no heat passed through to the coffee grounds. And the shape (like a cone head) dissipates the heat rather well.
Most also have up to 16 precision settings, from very coarse for French press brewing to extra fine for espresso or Turkish coffee. Because of the wide range of grind settings these grinders are ideal for all kinds of coffee equipment : Espresso, Drip, Percolators, French Press.
Thus the conical burr grinder is the ideal type of coffee grinder for those that love the flavor in their gourmet coffee. It is for those who have finally realized what a sensuous, ravishing, and complete experience a perfect cup of coffee is, and who would like to duplicate that experience at will in the comfort of their own home.
Recommended Conical Burr Coffee Grinders
This is the one I own. With a removable bean hopper that holds 1/2 pound of coffee beans, and a removable burr for convenient cleaning. It comes with a variable timer that sets the grind time from 10 to 30 seconds.
State-of-the-Art. Can be adjusted to 15 different grind sizes. Its bean hopper and coffee bin are glass to minimize any static "cling" of coffee grounds. The bean hopper, hopper lid, and coffee bin are dishwasher-safe. A burr cleaning brush is included. The coffee grinder measures 12 by 13-1/2 by 6 inches and carries a two-year warranty.
... I own a Breville ...
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