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Blade Grinder – Why You Shouldn't Use One Blade grinders use blades that look like propellers (think blenders). They are used to chop coffee beans. They are much cheaper than burr grinders and are easy to clean but they do not produce uniform grounds and can lead to over-extraction and bitterness in your coffee. A first-class coffee experience demands uniform particle distribution which can only be achieved by using the use of a burr grinder. It's not surprising that coffee people who are snobs dislike them. Inconsistent Grinds You may have noticed the results of your grinding aren't always consistent if you've used a blade grinder for a long time. The grinding device is likely wear out and dull. As the grinder ages it will produce different sized pieces of beans. This results in ground with varying degrees of coarseness. It's a challenge for your coffee brewer to create a consistent, balanced flavor with these various-sized particles. A blade grinder uses the same propeller-like blade to break the beans. It chops beans into smaller and smaller pieces, which are then tossed into a catcher through a screen. This method is effective however it's not the most efficient grind for your drink. An alternative is the burr grinder. A burr grinder is a much larger machine that has a powerful motor and two grinding burrs. The burrs are set at an exact distance from one another, which determines the coarseness of the coffee that you grind. If the burrs get too close, they smash rather than cut beans. As a result, the resulting grounds are less coarse and finer. They may also be brittle and alter the flavor of your coffee. If the burrs however, are too far apart, it will result in large chunks of coffee that have been coarsely ground. It is essential to choose a grinder that's setting is in line with the coarseness you want. A sharp, properly-adjusted blade will yield a consistent and fine grind for your coffee. If you notice that your grind is becoming increasingly uneven, it might be time to replace the burrs or the blade. You should also think about changing the grind setting if you haven't before, as this will help you achieve a more uniform grind. It's also important to note that if your machine produces clumped up grounds it is a sign of worn-out or damaged blades. The clumping happens when tiny particles stick to one another and larger pieces of ground, creating larger granules which don't dissolve in water. As your burrs grow and dull, this will occur more often. Uneven Extraction The size of your coffee grounds is vital for flavor extraction, whether you're making a French press pour-over, drip or drip brew. Uneven ground sizes cause uneven extraction, creating an imbalanced cup of coffee. The beans are cut into pieces and shredded in a random manner as they move through a blade mill, resulting in an unbalanced distribution of the size of the grind particles. A blade grinder may produce a mixture of large pieces that are dust-sized, as well as everything else. These different grind sizes are extracted at a different rate, resulting in a cup of coffee that is often bitter and inconsistent. Uneven distribution can cause problems when tamping or filtration. With a burr mill you can achieve a uniform particle size, allowing better tamping and filtering, which helps to prevent over-extraction. With a blade grinder, it is more difficult to achieve an even grind, and you might find yourself tamping from side to side or using the Stockfleth method (which requires some practice). Another issue with blade grinders is their speed and the generation of heat. This could cause the ground to burn and produce an bitter flavor. Burr grinders create less heat and are cooler, preserving the flavor of beans. A final downside of a blade grinder is that it's very easy to over-grind your beans. Keeping the grinder running continuously generates a lot of heat, which can cause your beans to be excessively extracted, which can result in a bitter brew. To avoid this, always put the grinder off before switching it back on. Blade grinders are an easy, inexpensive way to grind coffee at home. However they're not the ideal option for those who are serious about their brewing. It is recommended to use whole beans and use a burr grinder to get the most effective results. Make sure you purchase a high-quality coffee grinder that will meet all your needs. If you're looking to upgrade from your blade grinder, check out our top picks for most efficient burr grinders on market. The kind of grinder you select will affect the quality of your brewing as well as the quality of your drink. So, think about your budget, space, and preferred method of brewing prior to making your decision. Grounds burned Grounds With the blade grinder, you're using a sharp blade that spins like a blender at high speed to chop up the beans. When the blade spins at a fast speed it produces heat that may burn up the coffee grounds. These particles will alter the flavor of your coffee and aren't suitable for brewing. A premium coffee experience demands a uniform particle distribution for the best flavor extraction during the brewing process. Because the blade grinder breaks the beans into unevenly sized pieces, small and large, it's impossible to get this level of consistency. A burr mill, however, produces an even distribution of particle sizes that can be reproduced across a variety of brews. While the advantages of a blade grinder include its low cost and quick operation, its clear disadvantages are that it produces heat during use, produces irregularities in the size of the grind, and is not able to control the final particle size. There are ways to increase the efficiency with this type of grinder, despite its inherent limitations. When paired with a burr mill, the user is able to easily adjust the gap between the grinding discs to fine-tune the exact size of the ground of their preference. This allows them to extract the flavor they desire every time from their favorite coffee beans. However, creating a quality drink using a blade grinder takes a lot of trial and error. Angle grinders are powerful devices that should only be used by professionals. If it is used incorrectly, it can cause the dangerous condition known as grinding burn, which can cause localized changes in the metallographic structure of the workpiece's surface. This can lead to cracking and is not properly checked, could eventually cause macropitting and tooth fracture. Grinding burns can result from a variety of reasons, such as excessive grinding pressure or insufficient cooling. It can be caused by inadequate operator training. Wear the correct safety equipment when working with an angle grinder. This includes safety glasses with a face shield as well as steel toe boots. This will prevent sparks of heat from flying off the tool and hitting people or equipment nearby. Sparks can be capable of reaching temperatures up to 3,600 degF, and can be destructive to materials like paint or even metal. Brew that is disappointing A blade grinder can chop your beans in a random manner and leave you with different-sized ground. The uneven ground extracts coffee at different rates, leading to a weak or bitter cup of coffee. This affects the balance of a good cup – the soluble compounds from the beans are extracted slowly and create the flavor. You've likely heard that using a brewing burr grinder instead of a blade grinder is the best way to guarantee a great beverage. But many people don't know how to use a grinder or even what it does, so they buy one of the flimsy, uncontrollable blade grinders that are easily found in grocery stores and kitchen-type places. In essence, these grinders feature a double-pronged blade at the bottom of a chamber that spins fast and chops up anything it strikes, including your coffee beans. You press a button to activate the device and the blade chops up your beans into a bunch of different-sized pieces. The small bits are tossed to the bottom, and get chopped all over again, while the large pieces remain towards the top of the chamber. This causes uneven ground, which are difficult to measure. Another issue with these grinders is that they produce lots of heat when they grind, which could damage your beans and ruin your coffee. The heat can also take away some of the flavor from the beans, which means you're left with a less-than-delicious cup of coffee. If you've grind your coffee by yourself using a blade mill, it's time to upgrade to a more effective. A burr mill will do the job for a fraction of the price, and produce a much superior result. It's well worth the investment. If espresso machine with grinder want more control over the brew, try a manual burr grinder such as the Rhino hand grinder. These grinders feature burrs however they are powered by an engine, which gives more control than a plug-in or electric grinder.