Locking top so bean particles don't fly out while you grind
Side-mounted handle for better ergonomics
Wide base for more stability while grinding
100g Capacity hopper able to contain enough coffee beans for 5 cups of joe
Coarseness adjustment ring to select a grind setting with one twist
20 preset coarseness levels at 125 micron intervals fit for any method of brewing
38mm conical burrs made from densely sintered Alumina ceramic which has high strength and hardness, temperature stability, and high wear resistance and corrosion resistance
Triple mounted stainless steel axle to eliminate burr wobble and produce a consistent grind
Borosilicate glass catcher to prevent static and sticky grounds
By choosing one of the reward levels above, you will become one of the first people in the world to own a Handground grinder. Select a reward from the column to the right or click one of the rewards on the image abov
Black Handground Grinder
The black version of the Handground grinder will be made out of acrylonitrile butadiene styrene, otherwise known as ABS plastic. ABS is considered superior for its hardness, gloss, toughness, and electrical insulation properties. ABS's light weight and ability to be injection molded and extruded make it useful in manufacturing products for everything from musical instruments, to golf clubs heads, to automotive components including bumpers, protective headgear, luggage and protective carrying cases, to coffee grinders :) The list is endless for the applications of ABS plastic.
It is a very strong and durable plastic that will withstand the abuse of even the most careless coffee brewers.
Nickel AND Copper Handground Grinder
The nickel and copper versions of the Handground grinder will be made out of ABS plastic and then electroplated with either nickel or copper metal.
Electroplating enables us to coat plastic with metal to achieve a real metal surface to increase the strength of the plastic substantially without adding a ton of weight to the product. This is a common practice used in home appliances like the sink faucets and handles and in the auto industry. These products look and feel metal because they are coated in actual metal, but if you were to break one in half (which is very hard) you would see that the inside is actually made of a hard plastic. We have currently chosen this method to achieve the nickel and copper finished versions of the grinder.
As discussed in the Risks and challenges, if this process does not live up to our standards and survive our thorough strength and durability tests, we will explore other methods to achieve the results we are looking for, including possibly die-casting the parts out of full metal.
The burrs are 38mm conical burr mills made from densely sintered Alumina ceramic which has high strength and hardness, temperature stability, and high wear resistance and corrosion resistance. We are continuing to experiment with material composition, the treatment process for the ceramic, and mechanical design aspects such as the angle and sharpness of the teeth. We will keep everyone updated on our progress with the burrs.
Stainless steel components
The main vertical axle and all screws and washers that will be in contact with the beans will be made from 300 grade stainless steel that you typically see in pans and other cookery tools.
Stainless steel is non-porous, it resists bacteria and germs more effectively than wood or plastic surfaces. It also is one of the most hygienic surfaces available, so any foods that come into contact with the surface or material do not attract dirt or germs. Stainless steel also does not react with coffee or other drink/food products.