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Knob coffee grinder offers interesting rotation in manual grinding Daily Coffee News by Roast Magazine


The Knob Coffee Grinder, which is currently making its way via Kickstarter. Images courtesy of Knob.

The evolution of the rotary ring mill took another turn with a manual spindleless coffee grinder called the button coffee grinder.

Manufacturers of the device are currently rounding up preorders on Kickstarter, where more than $ 200,000 has been raised with just over a week before the campaign ends.

The shredder was created by a team based in Fairfax, Virginia, led by industrial designer Ahmet Ergün and architect Yavuz Bozkurt.

button grinder top

It is centered on a set of taper cutters where the outer annular cutter rotates while the inner taper cutter remains stationary. Similar to the system designed by engineer Christian Etzinger and first introduced to the electric grinder market by Baratza in its Sette range of mechanical grinders, the Knob Grinder reverses the conventional burr grinding action in which the cone cutter internal is turned in a mill with a fixed external cone.

“There are several high-end hand grinders on the market and all of them have the same design with an axis,” Yavuz Bozkurt, professional architect and chief engineer of Knob Grinder, told Daily Coffee News. “The main difference with the button grinder is that it pulls out the spindle and gives the coffee beans plenty of room.”

According to Bozkurt, the Knob avoids the potential pitfall of the manual grinder of axle wobble which results in inconsistent grind. It also allows users to clean the grinder with a brush without completely disassembling it.

“You will never have the risk of losing your grinder’s washer, spring, etc.,” said Bozkurt. “The other useful feature is that the adjustment of the coarseness of the grind can be done outside the grinder with high resolution. “

black grinder

The tapered cutter for the button is centered in the aluminum body of the crusher by arms attached to a threaded collar. To operate the continuous knob adjustment system, the user turns this collar, which raises and lowers the position of the fixed internal cone cutter relative to the rotary annular cutter, which remains in its position at the top of the cutter. column.

Between each of the 108 reference points of the adjustment collar, the variation in the gap between the burrs is 30 microns and the thread is fine enough to provide three full rotations, resulting in a range of grind sizes that , according to the company, will cover the full spectrum of coffee brewing methods. .

The compact device is 150 millimeters (5.9 inches) in height and 58 millimeters (2.2 inches) in diameter.

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To provide a clockwise grinding motion, the final version of the knob will feature either a mirror version of the standard 47-millimeter taper cutters made by Italian manufacturer Italmill or, depending on the outcome of the Kickstarter campaign, Italmill’s new titanium V-Macino. coated burrs, specially designed for manual grinders.

A special, censored version of the Knob grinder called ‘No Axle Grinder’ will also be offered to users in the UK, where the grinder’s name carries a double meaning that has sparked a flurry of jokes online.

Of the grinder’s two iconic exterior side knobs, one screws to hold the grind adjustment in place, and the opposite knob keeps the removable handle in place when the grinder is in ‘travel mode’. The lid and receptacle are both dishwasher safe and both fit into the crusher body at the top and bottom respectively. The lid can also snap into the collector to function as an airtight box for storing a dose or two of whole or ground coffee.

coffee button

The company plans to launch retail sales of the Knob Grinder worldwide in February 2022 for $ 285.


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