Grinder service & burr changes

The grinder is the most overlooked half of a great espresso. Worn burrs do not stop the machine pulling shots - they just slowly destroy the flavour, the consistency and the extraction time, while the operator quietly compensates with bigger doses and tighter tamps. The fix is not a new machine. The fix is a fresh set of burrs and a proper calibration.

What a grinder service covers

• Burr inspection and replacement - Mazzer, Mahlkonig, Eureka, Anfim, Compak, Victoria Arduino, Fiorenzato, Nuova Simonelli and similar. Fresh OEM-spec burrs, fitted and aligned.
• Full chamber strip-down - oils, fines and stale grounds cleaned out of the burr chamber, throat and chute.
• Dose calibration - timer or weight-based, set to your target dose with consistent shot-to-shot variance.
• Hopper and lid check - hopper seals, anti-static cleaning, lid fitment.
• Motor and bearing check - listen-test for bearing wear, current draw under load.

How to tell your burrs are gone

Extraction time creeping up while the grind setting drifts finer. Inconsistent shot times across the day. Bitterness or sourness appearing in shots that used to be balanced. Higher dose required to hit the same yield. By the time a head barista is complaining, the burrs have been past it for weeks.

Service interval

For a typical cafe, replace commercial burrs every 400 to 600 kg of coffee ground - depending on burr material and bean profile. Most Brisbane cafes are due more often than they realise.