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Espresso extraction engineering

Contents

Topic

Grinding and particle size

Burr geometry, alignment and distribution, rather than the micron number on the dial.

Scope

Burr geometry and alignment, particle size distribution and how it is measured, fines and boulders, retention, and the difference between a grinder setting and the bed it produces.

Articles (6)

  1. 1Zpresso’s microns per click are burr travel, not particle size

    Shows that 1Zpresso’s manuals and comparison page examined here attach microns per click to axial burr travel (8.8 µm on J-Max; 22 µm on K-Max / K-Pro / K-Plus), while the manufacturer’s Coffee Grind Size Chart tabulates those increments…

  2. Weber’s “5 micron stepped adjustment” is not one attachment

    Shows that Weber Workshops’ EG-1 and KEY product pages both brand a “5 micron stepped adjustment,” while the EG-1 instruction manual examined here attaches “each tick adjusts by 5 microns” to grind numbers it also describes as meaning…

  3. The E65S GbW brochure attaches 180–600 µm to two indicating claims

    Shows that Mahlkönig’s May 2022 E65S GbW product brochure attaches the same 180–600 µm grind-adjustment range to a Disc Distance Detection indication precision of 0.001 mm and, separately, to an 80-step indicating scale on an ultrafine…

  4. The same 200–400 µm band names particle size and burr gap

    Shows that one manufacturer page applies the same 200–400 µm band to unnamed espresso particle size and to Disc Distance Detection burr gap, while a measured traditional espresso powder in Mo et al. 2023 sits outside that band by d[3,2]…

  5. Field alignment microns map to four different published figures

    Maps commonly repeated “alignment micron” figures onto four published figures in the sources examined here — unnamed-component tolerance, axial dial pitch, patent description sensitivity language, and a qualitative marker contact pattern…

  6. Mazzer ZM’s espresso µm range moves with the burr SKU

    Shows that Mazzer’s ZM product documents attach micron grind settings to burr distance, while the manufacturer’s indicative grind-settings chart publishes espresso Recommended Range [μm] as 190–280 on K151B and 260–350 on K151I — and does…