Equipment

Burr grinder

A burr grinder uses two rotating burrs (either flat plates or conical cones) to grind coffee beans to a consistent, adjustable size. Burr grinders are essential for specialty coffee because they produce uniform particle sizes — unlike blade grinders, which produce inconsistent shards.

Commercial espresso grinders typically use flat burrs (60–84mm in diameter) for sharper, brighter shots, or conical burrs for fuller body and more forgiveness. Both work; the choice affects taste profile and consistency. Most modern specialty cafés use flat burr grinders for their espresso bar.

Burr quality, alignment, and condition matter enormously for shot consistency. Worn burrs produce more fines (over-extraction) and dull particles (under-extraction at the same time) — making dial-in nearly impossible. Most commercial burrs need replacement every 600–1,200 lb of coffee ground.

Maintenance is critical: daily cleaning (vacuum and brush the burr area), weekly deeper cleaning, and quarterly inspection of burr condition and alignment. Skipping any of these compounds into shot quality problems within weeks.

Related terms

Keep exploring

Drinks

Espresso

Espresso is a small, concentrated coffee beverage made by forcing about 92–94°C water through finely-ground, tamped coffee at 9 bars of pressure for 25–32 seconds.

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Espresso

Dial-in

Dial-in is the process of adjusting an espresso grinder until shots hit your target dose, yield, and time — typically 18g in, 36g out, in 25–32 seconds.

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Espresso

Extraction

Extraction is the process of water dissolving soluble compounds from ground coffee during brewing.

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Espresso

Channeling

Channeling is when water flows unevenly through the coffee puck during espresso extraction, creating channels through the grounds.

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FAQ

Frequently asked questions

How often should I replace burrs?
Commercial flat burrs: every 600–1,200 lb of coffee ground. Conical burrs: 1,500–2,000 lb. Track lifetime usage in your equipment log. Signs you're past due: shots run faster at the same grind, more fines, muted flavor.
Are flat burrs better than conical?
Neither is universally better — they emphasize different qualities. Flat burrs produce sharper, brighter, more clarity-forward shots. Conical burrs produce fuller-bodied, more forgiving shots. Most modern specialty cafés use flat burrs for espresso.
Why are burr grinders so much more expensive than blade grinders?
Precision. Burr grinders cost $500–$5,000 because they need precision-machined burrs, durable motors, and adjustable grind settings. Blade grinders are $20–$100 because they're imprecise tools that can't grind for espresso reliably.

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