Burr wear and replacement

How burr wear affects grind consistency and flavor, and when to replace them for optimal performance.

Article 8 of 12 in Grinding Science & Technology/

Key Concepts

Burr Wear:
Burrs gradually lose sharpness with use, causing inconsistent particle sizes.
Worn burrs lead to more fines or larger particles, affecting extraction and flavor balance.
Indicators of Wear:
Longer extraction times for the same grind setting.
Increased variability in particle size distribution.
Noticeable flavor defects such as sourness or over-extraction.
Replacement Guidelines:
Frequency depends on grinder type, bean hardness, and daily throughput.
High-volume commercial grinders may need burr replacement every 500–1000 kg of coffee.
Home grinders might last 1–2 years depending on use.
Maintenance Tips:
Clean burrs regularly to prevent buildup that accelerates wear.
Document usage and monitor extraction times to detect gradual wear.
Keep a spare set of burrs for timely replacement to maintain consistency.

Regular monitoring and timely replacement of burrs ensure consistent grind quality, optimal extraction, and preservation of coffee flavor profiles.