News Articles by Graeme Burton
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The E61 Group Head: An Oldie but a Goodie
Our Technical Services Engineer, Graeme Burton, takes everything coffee to a whole new level and explains here the E61 group head. Graeme worked in Curtin University’s Physics department for many years before joining Five Senses, where he combines his passion for coffee and his scientific know-how.
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Brew pressure explained
Have you ever wondered why the pressure on the brew gauge of your espresso machine changes, even when you are not extracting a shot? It’s normal for the brew gauge to indicate and move between three nominal pressures.
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Popcorn Schmopcorn!
It is a commonly held belief within the coffee community that grinder hoppers should be kept full of beans to reduce the ‘popcorn effect’. The popcorn effect refers to coffee beans bouncing around in the grinder hopper before they are engaged by the grinder burrs. Apparently, if the beans are allowed to jump for joy before being ground to pulp the espresso extraction will be different when compared to an extraction from beans weighed down in the hopper.
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Grinder purge quantity
Experienced baristas know all about purging the grinder, but our Technical Services Engineer, Graeme, takes it to a whole new level with his recent experiment looking at the difference between purging a grinder with an auger versus one without. Graeme worked in Curtin University’s Physics department for many years before joining Five Senses, where he combines his passion for coffee and his scientific know-how.
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Electronic grinders: the first 20kg
Doserless, electronically timed grinders, such as the Mazzer Robur E, have gained popularity recently because they reduce wastage and improve dosing consistency. However, some baristi have noticed at least two strange behaviours during their initial period of use. The first, that the grinders appear to speed up and the second, that the adjustment of grind size and dose is both erratic and required frequently. Anecdotal evidence suggests that new burrs require around 20–30 kg to ‘wear in’.
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