I'm wondering whether someone might be able to diagnose this annoying channeling problem I've got. It's driving me crazy.
I'm using a Unico Splendour machine with a convex 58mm tamper. FWIW I'm using Cosmorex Rio Gold beans which I grind at home using a Rocky doserless. I'm pretty sure the machine zeroes at 8 (out of 40) and I grind a 10, (but have also tried at 9). I weight 22g (sometimes 21g) into the portafilter and use the tamp to push the coffee down and it resides with normal pressure just under the raised 'lip'.
BUT, I always get a channel hole at the same position, at 12 o'clock or 12:30 (see diagram). The consistency of the channeling occurring AND its position has to be something systematic. Any ideas? It's making great coffee taste not so great
I'm using a Unico Splendour machine with a convex 58mm tamper. FWIW I'm using Cosmorex Rio Gold beans which I grind at home using a Rocky doserless. I'm pretty sure the machine zeroes at 8 (out of 40) and I grind a 10, (but have also tried at 9). I weight 22g (sometimes 21g) into the portafilter and use the tamp to push the coffee down and it resides with normal pressure just under the raised 'lip'.
BUT, I always get a channel hole at the same position, at 12 o'clock or 12:30 (see diagram). The consistency of the channeling occurring AND its position has to be something systematic. Any ideas? It's making great coffee taste not so great

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