What I learned from analyzing 300 particle size distributions for 24 espresso grinders

Jonathan Gagné · 21 Sept 2023 · coffeeadastra.com ↗

3 korrents from this piece

Jonathan Gagné did not write this page.

Every claim below was made in this piece, quoted word for word and numbered in the order the piece makes them, so you can read it there rather than take our word for it. The sentence above each quote is our reading of the claim, not their wording. Each quote was checked against a stored copy of the page at build time; where the two differ, the quote is the fact.

Our reading
Conical burrs tend to be less unimodal and less uniform than flat burrs, though the two overlap a lot.

Their wordsConical burrs appear on average less unimodal and less uniform, although there is a large overlap meaning that one can easily find a specific flat burr that is less unimodal and less uniform than a specific conical burr.
Our reading
Grinders that produce fewer fines (more unimodal) also tend to produce more uniform particle sizes.

Their wordsContrary to popular hearsay, more unimodal grinders appear to also be more uniform on average.
Our reading
Burr geometry matters more than burr size for how uniform and unimodal a grinder's output is.

Their wordsIt therefore appears that burr geometry may be more important than burr size in determining unimodality and uniformity.