☕ Extraction Science & Brewing Mechanics
Specialty Coffee Hub
Choose your brewing discipline. Gravity percolation and forced-pressure espresso demand entirely distinct extraction physics, grinder calibrations, and sensory diagnostics.
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Gravity Percolation
Pour-Over Filter Lab
Dial in specialty filter brews using Lance Hedrick's Two-Pour technique, sensory diagnostic compass, and variable isolation protocol.
- • Sensory Compass: Sour vs. Astringent vs. Bitter troubleshooting.
- • Lance's 2-Pour Recipe: 3x Bloom + Single continuous pour.
- • Phase Stopwatch: Bloom degassing and drawdown tracker.
- • Dial-In Journal: Track bean adjustments across brews.
Enter Pour-Over Lab
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6 – 9 Bar Pressure
Espresso Extraction Lab
Puck preparation mechanics (WDT & level tamping), dial-in basics, and modern espresso recipe exploration with relative grind calibration.
- • The 4 Constants: Fixed dose, fixed yield, flat tamp & grind-only lever.
- • Modern Shot Matrix: Ristretto, Normale, Lungo, Turbo Shot & Allongé.
- • Turbo Shot (Cameron Model): 6-bar high-flow, coarse-grind, zero astringency.
- • Relative Grind Shift Gauge: Grind offset relative to standard dialed-in espresso.
Enter Espresso Lab
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Percolation vs. Pressurized Extraction
| Extraction Parameter | Pour-Over (Filter) | Espresso |
|---|---|---|
| Driving Force | Atmospheric gravity + hydrostatic head | 6 to 9 bars pump pressure |
| Typical Grind Particle Size | Medium-fine to medium (500–800 µm) | Fine to extra-fine (150–350 µm) |
| Standard Brew Ratio | 1:15 to 1:17 (e.g. 15g → 240g) | 1:1.5 to 1:3 (e.g. 18g → 36g) |
| Extraction Contact Time | 2:00 to 4:00 minutes | 12 to 35 seconds |
| TDS (Total Dissolved Solids) | 1.2% – 1.5% (Clean, delicate clarity) | 8% – 12% (Viscous, emulsified crema) |
| Primary Channeling Cause | Over-fining and excessive drawdown swirling | Puck clumps, uneven tamping, high resistance |