What Jonathan Gagné thinks about design
Astrophysicist and coffee researcher; author of The Physics of Filter Coffee and The Physics of Espresso, and writer of the Coffee ad Astra blog on brewing science and equipment.
Jonathan Gagné did not write this page.
We collected these quotes from things they published elsewhere, and every quote links to where it was said. They have no account here and have not endorsed this site. Quotes are word for word; the short line under each one is our own restatement, not their wording. Their own site. Is this you? Claim it or ask us to remove it. Or tell us what is wrong here.
3 dated positions, 2022 to 2023, in their own words. Our reading of what Jonathan Gagné has said — not written or endorsed by them.
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Our readingBurr 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.
↗What I learned from analyzing 300 particle size distributions for 24 espresso grinderscoffeeadastra.com 3rd of 3 in this piece
- 14 months earlier
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Their wordsI now suspect that adding a source of hydraulic resistance under the puck that is non-negligible compared with the espresso puck itself is desirable to reduce the impact of channels because it slows down the flow of water where it would tend to become otherwise too fast and as a consequence less even across the surface of the coffee bed.
↗More Even Espresso Extractionscoffeeadastra.com 1st of 2 in this piece
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Their wordsflat burrs tend to send the coffee preferentially on one side of the portafilter (to the right side with the design of EG-1), an effect probably worsened by the use of high rpm.
↗More Even Espresso Extractionscoffeeadastra.com 2nd of 2 in this piece