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Blade Grinder – Why You Shouldn't Use One A blade grinder uses an e-type propeller (think blenders) to chop coffee beans. They are less expensive than burr mills and easy to clean, however they don't produce uniform ground and can cause bitterness and over-extraction in your brew. A top-quality coffee experience requires uniform distribution of particles, something that can only be achieved by using a burr grinder. It's no wonder coffee people who are snobs dislike burr grinders. Inconsistent Grinds You may have noticed that your grinding results are inconsistent when you've used a blade mill for a long time. The grinder is likely to be worn out and dull. As the grinder wears down it will break up beans into different-sized pieces. This can lead to different levels of coarseness. It's challenging for your coffee maker to get a consistent, balanced flavor with these various-sized particles. A blade grinder cuts the beans with a rotating blade that looks like propellers. It chops the beans up into smaller and smaller pieces which are then tossed into a catcher through the screen. This method is efficient however it's not the best grind possible for your brew. A better alternative is a burr grinder. A burr grinder is a larger machine that has a powerful motor and two grinding burrs. The burrs are set at a certain distance apart and will determine the coarseness of the ground coffee. If the burrs get too close, they pulverize rather than cut the beans. The result is a more fine more refined, less coarse ground. They are also more brittle, which can negatively impact the taste of your coffee. If the burrs, on the other hand are too far apart, it will result in large chunks of coffee that are coarsely ground. It is essential to select the coffee grinder with an appropriate setting to match the level of coarseness you want. A sharp, properly adjusted blade will yield a consistent and fine grind for your coffee. If you find that your grind is becoming more uneven, it's probably a good idea to replace the blade or burrs. It is also advisable to change the grind setting if you haven't already in order to allow you to achieve an even and consistent grind. It's also important to note that if your grinder creates clumped up grounds this could be a sign of worn-out or damaged blades. The clumping happens due to small particles adhering to each other and larger pieces of ground, creating larger granules that do not dissolve well in water. This is more frequent as your burrs become duller. Uneven Extraction No matter if you're using drip, French press, or pour-over, the size of your ground plays an crucial role in preserving flavor. Uneven ground sizes can lead to uneven extraction and a sloppy cup of coffee. The beans are sliced and shredded randomly as they pass through a blade mill, resulting in an uneven distribution of the size of the grind particles. A blade grinder can produce a mix of large fragments, dust-sized particles, and everything else in between. These different grind sizes are extracted at different rates, leading to an inconsistent and often bitter cup of coffee. Inconsistency can cause problems when tamping or filtering. With a burr grinder, you can achieve an evenly-sized particle size that allows for more even tamping and filtering that prevents over-extraction and weak brews. With a blade grinder it is more difficult to get an even grind, and you may find yourself tamping from side to side or using the Stockfleth method (which requires some time to master). The high speed and heat produced by blade grinders is a different problem. This can cause the ground to become burned and create a bitter taste. Burr grinders are more cool and don't produce as much heat, which preserves the flavors of the bean. A final downside of the blade grinder is that it's very easy to over-grind your beans. Running the grinder continuously produces a lot of heat, which can cause your beans to be over-extracted, resulting in a bitter brew. To avoid this, always stop your grinder prior to switching it back on. Blade grinders are a convenient and inexpensive method of grinding coffee at home. However they're not the best choice for those who are serious about their coffee-brewing. You should stick to whole beans and burr grinders for the most effective results. Make sure you purchase a high-quality coffee grinder that meets all your requirements. If you're looking to upgrade from your blade grinder, check out our top choices for the best burr grinders on the market. The right choice of grinder is an important decision that will affect the quality of your brewing and overall cup quality therefore, you should consider your budget, your space and the method you prefer to use when making your decision. Grounds burned Grounds With the blade grinder it's a sharp blade that spins like a blender at a high speed to break up the beans. The blade's rapid movement produces heat, which can burn some of the coffee grounds. These particles will ruin the taste of your coffee and aren't ideal for brewing. For a first-class experience an even distribution of particles is essential for optimal flavour extraction. This consistency is impossible with a blade grinder, which breaks the beans into small and large pieces. A burr mill, however produces a uniform distribution of particle sizes that can be reproduced over a number of different brews. While the benefits of a blade grinder include its low cost and quick operation, its major drawbacks are that it generates heat when it is used, creates variations in the size of the grind and lacks control over final particle size. There are ways to improve results using this type of grinder despite its inherent limitations. When a burr mill, the user is able to easily adjust their desired grind size by adjusting the gap between the discs. This allows them to extract all of the desired flavors from their favorite beans each time. However, making a great drink using a blade grinder requires a lot of trial and trial and. An angle grinder is a potent tool that should be utilized only by trained professionals. If it is used incorrectly, it can cause an unsafe condition known as grinding burn, which can cause localized changes in the metallographic structure of the workpiece's surface. This can lead to cracking that, if not checked, could lead to teeth fracture and macropitting. Grinding burn can be caused by many reasons, such as excessive grinding pressure or insufficient cooling. It can also be caused by improper operator training. If you intend to use an angle grinder, make sure you wear the correct PPE such as gloves, a face shield, safety glasses, steel-toe boots and long sleeves. This will prevent hot sparks from flying out of the machine and hitting nearby equipment or people. The sparks can reach temperatures as high as 3,600 degF, and can be able to burn through materials such as paint or metal. Brew that is not what you expected. A blade grinder can chop your beans indiscriminately and leave you with different-sized ground. These different sizes of grounds are extracted at different rates in your coffee maker and this leads to the cup being weak or bitter of brew. The issue with this is that it destroys the balance that makes for a great cup of coffee – soluble compounds in your beans are extracted over time, resulting in the flavor that makes your coffee scrumptious. It's likely that you've heard that using the burr mill rather than a blade mill is the best method to make the best beverage. Many people don't understand what a burr mill does. They purchase the cheap blade grinders that are difficult to control and can find in supermarkets and places that are kitchen-like. These grinders are basically two-pronged blades that are located at the bottom of an enclosed chamber. It spins fast and chops everything it comes into contact with including beans. The blade is activated by pressing a button. It then chops coffee beans into various sized pieces. Small pieces fall to the bottom of the chamber, and are again chopped, while the larger pieces remain at the top. This results in uneven grounds, which are difficult to measure. These grinders can also burn your beans, ruining the coffee. The heat can also take away some of the flavor of your beans. This can leave you with a not the best cup of coffee. If you have been grinding your coffee yourself using a blade mill, it's now time to upgrade to something more efficient. stainless coffee grinder can do the job at only a fraction of the cost and will give a superior result. It's worth it. If you're looking to have more control over the brew Try a manual grinder like the Rhino hand grinder. These grinders feature burrs, but they are powered by the crank. This allows you to control the grind more than a plug-in or electrical grinder.