rotary querns

The Ultimate Retro-Tech Experiment In a market saturated with high-RPM motors and plasma-coated steel burrs, Weber Workshops has released the SG1—a product that ignores a century of mechanical innovation to embrace two millennia of ancient history. This isn't your standard consumer electronics update. It is a rotary quern, a stone-on-stone grinding system with roots stretching back to 200 BCE. While most reviewers focus on the latest silicon chips, we are looking at 40 kilograms of solid rock designed to pulverize coffee beans through sheer mass and centrifugal force. Ancient Engineering Meets Modern Luxury The SG1 utilizes a design featuring two stacked cylindrical stone discs. The top stone features a concave "bosom" and a central feed hole known as the "eye," acting as a primitive but effective hopper. Unlike the precision-machined teeth of a modern EG1, the SG1 relies on hand-carved "furrows" or grooves divided into eight quarters. These furrows funnel the coffee outward toward the circumference where the stones meet, providing the final grind. This unit skips the motor entirely, relying on a hand-turned wooden pivot and the user's own physical exertion to dictate revolutions per minute. The Brutal Reality of Stone Grinding Operating the SG1 is less like making coffee and more like a heavy-duty workout. At over 80 pounds, the sheer bulk ensures the machine never moves during use, providing a level of stability no plastic-housed grinder could match. The experience is tactile and sensory; you smell the coffee as the stones crush it, and you feel the resistance of the beans through the handle. However, the lack of a modern discharge chute means coffee particles spray outward, and the internal retention is staggering. Cleaning requires lifting a 20kg top stone and manually brushing out the furrows with a horsehair brush. Performance Comparison: Stone vs. Steel When pitted against the Weber Workshops EG1, a pinnacle of modern espresso technology, the results are surprisingly polarizing. The EG1 produces a clean, clinical cup with distinct flavor separation. In contrast, the SG1 delivers a profile that is almost hyper-saturated. The porous nature of the stone creates a rolling action that mimics the sweetness found in cast steel burrs but at a much higher intensity. We noted punchy raspberry notes and a velvety, chocolatey mouthfeel that far surpassed the modern equivalent in terms of body and presence. The Final Verdict The SG1 is a fascinating piece of performance art. At a fictional price point of $55,000, it is clearly not a practical purchase for the average kitchen. It is an exploration of how ancient methods can still compete with, and sometimes exceed, the flavor profiles of modern machinery. While the maintenance is a nightmare and the mess is significant, the cup quality suggests that maybe we shouldn't have abandoned the stone age so quickly. If you have the strength and the counter space, this is the ultimate statement piece in coffee history.