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Blade Grinder – Why You Shouldn't Use One Blade grinders use a propeller-like blade (think blenders) to chop coffee beans. They are less expensive than burr mills, and easier to clean, however they don't create a uniform ground and can result in bitterness and over-extraction in your brew. A premium coffee experience requires uniform particle distribution, something that is only possible with the use of a burr grinder. It's not surprising that coffee experts hate burr grinders. Inconsistent Grinds If you've used a blade grinder for some time, the chances are your grinding results have changed. The grinder is likely to wear out and dull. As the grinder wears out, it will chop up beans into various sizes. This will produce grounds with varying levels of coarseness. With the different sizes of coffee particles, it's difficult for your coffee maker to extract the right balance and consistency in flavor. A blade grinder breaks the beans with a rotating blade that appears like a propeller. It basically chops the beans into smaller and smaller chunks that are then thrown through a filter into the catcher. While this method works however, it's not the best method for producing the best grind for your beverage. A better alternative is the burr grinder. A burr grinder is a much bigger machine, with a large motor and two grinding burrs. The burrs are set at a specific distance which determines the coarseness of the ground coffee. When the burrs are too close to each other, they will crush the beans rather than cut them. The result is a more fine and less coarse grind. They are also more brittle, which can negatively impact the taste of your coffee. On the other however if the burrs are placed too separated, they could create large chunks of coarsely-ground coffee. It's important to choose a grinder with a setting that corresponds to your desired coarseness. A sharp, properly-adjusted blade will produce an even and fine grind for your coffee. If you notice that your grind is becoming increasingly uneven, it may be time to replace the burrs or blade. If you haven't already done so, you should also change the grind setting to achieve more even grinding. It's also worth mentioning that if your grinder creates ground that has clumped together it is an indication of worn-out or damaged blades. The clumping occurs when tiny particles bind to one another and larger pieces of ground, producing larger granules that don't dissolve in water. As your burrs become more and less dull this will occur more often. Uneven Extraction The size of your coffee grounds is important for flavor extraction, whether you're making a French press pour-over, drip brew or pour-over. Uneven ground sizes cause uneven extraction, leading to an imbalanced cup of coffee. The beans are cut into pieces and shredded in a random manner when they go through the blade mill, resulting in an uneven distribution of the size of the grind particles. A blade grinder produces a mix of larger fragments, near-dust size particles and everything in between. The different sizes of grinds produce at different rates, leading to an inconsistent and often bitter cup of coffee. burr mill grinder can result in problems with tamping and filtering. With a burr grinder you can get an evenly-sized particle size, allowing for more even tamping and filtering, which helps prevent over-extraction and weak beers. With a blade grinder, it is more difficult to attain 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 the heat produced by blade grinders is another problem. This could cause the ground to get burned and produce a bitter taste. Burr grinders are much cooler and don't generate as much heat, which helps preserve the flavors of the bean. The blade grinder has a final disadvantage: it is very easy to grind your beans too fine. The grinder can generate a lot heat and eventually your grounds will be over-extracted. This can result in a bitter drink. To avoid this, always stop your grinder prior to switching it back on. Blade grinders are an easy, inexpensive way to grind coffee at home. However, they're not the best option for those who are serious about their brewing. For the best results, it is recommended to make use of a burr mill and whole beans. Make sure you purchase a high-quality coffee grinder that meets all your needs. We've compiled a list of our top choices of the best burr mills on market if you're looking to upgrade your blade grinder. Choosing the right type of grinder is an important decision that will affect the brewing process and overall cup quality, therefore, you should consider your budget, your space and your preferred brewing method when deciding on the best grinder. Burned Grounds With a blade grinder is an extremely sharp blade that moves like a blender at a high speed to break up the beans. As the blade rotates at a quick pace it produces heat that could cause the burning of some of your grounds of coffee. The burned particles aren't suitable for the brewing process and will create an unpleasant taste in your coffee. For a truly exceptional experience, a uniform distribution of particles is essential for optimal flavour extraction. This consistency is not achievable with a blade grinder, which breaks the beans into small and large pieces. A burr grinder on the other hand, achieves a uniform distribution of particles that can be reproduced over many brews. While the advantages of a grinder with blades include its low price and fast execution, its main drawbacks are that it generates heat when it is used, creates irregularities in the size of the grind, and lacks control over final particle size. With a little practice, however, there are ways to maximize results despite the inherent limitations of this type of grinder. When used in conjunction with a burr grinder the user can easily adjust the distance between the grinding discs, allowing them to fine-tune the exact ground size of their choice. This allows them to get all the desired flavours from their favourite roast beans every time. However, creating a quality brew with a blade grinder is a process that requires a lot trial and trial and. An angle grinder is an extremely powerful tool that should be utilized only by trained personnel. It can cause grinding burn when it is used improperly. This causes localized changes to the metal surface of the workpiece. This can cause cracking, which is not properly checked, could eventually cause teeth fracture and macropitting. Grinding burn can be caused by many factors, including excessive grinding pressure or insufficient cooling. It could be caused by inadequate operator training. Wear the appropriate PPE when using an angle grinder. This includes safety glasses as well as a face shield and steel toe boots. This will help prevent any sparks of heat from flying off the wheel and striking equipment or people close by. Sparks can be capable of reaching temperatures as high as 3,600 degF, and can cause damage to materials such as paint or metal. Brew that is disappointing A blade grinder will chop your beans up indiscriminately and leave you with different-sized grounds. The uneven ground extracts coffee at different rates, leading to an unbalanced or bitter cup of coffee. The issue with this is that it can ruin the balance that makes a good cup of coffee. Soluble compounds in your beans are extracted over time, which creates the flavor that makes your coffee taste delicious. You've probably heard it said that using the burr mill rather than blade mills is the best method to make a great beverage. However, many people don't know how to use a burr mill or even what it is and so they purchase one of the flimsy, uncontrollable blade grinders that are easily found in supermarkets and other kitchen-type places. Basically, these cheap grinders have a blade with two pronged in the middle of a chamber that spins fast and chops up anything it hits, including your coffee beans. Press a button to start the grinder and the blade cuts up your beans into a bunch of different sized pieces. The small bits fall to the bottom and are chopped again, while the larger pieces stay towards the top of the chamber. This results in uneven grounds which are difficult to accurately measure – which is why you can't be sure of how much ground coffee your grinder produced. These grinders could also burn your beans, ruining your coffee. The heat also takes away some of the flavor of your beans, and you're left with a less-than-delicious cup of coffee. If you've been grinding your own coffee using a blade grinder It's time to put it down it and upgrade to a more powerful. A burr grinder will accomplish the job for less than the cost and will give a superior result. It's worth it. Try a manual burr mill like the Rhino Hand Grinder if want to have more control over your brew. These grinders have burrs, but are powered by an engine, which gives more control than a plug-in or electric grinder.