Coffee Appreciation

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roltyid

Thanks for the prompt responses.

That seems like a massive dose. Is there any chance you're over-filling and when you put the portafilter in and rotate, the puck is rubbing against the shower screen?

This could be something to look at - I'll look to try a smaller dose (around 18g). I have noticed some grounds on the shower screen when cleaning so it could be that the puck is making contact with it. That's not something I'd considered.

Any chance the tamping isn't level so you're getting channelling down the side? Or are you knocking the portafilter with the tamper to get grounds of the side? That can also cause channelling by cracking the puck.

I'm happy that the tamping is OK and I'm taking care not to knock the portafilter, but I'll pay more attention to this in the future.

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hippy in reply to @roltyid

could be that the puck is making contact with it

You will typically see a depression in the top of the puck from the screw that holds the shower screen in place, if you've overfilled it.
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mmccarthy in reply to @roltyid

I have noticed some grounds on the shower screen when cleaning so it could be that the puck is making contact with it.

Having grounds on the screen is normal in a pump-driven machine, when the shot finishes you'll have some back pressure that sucks liquid back up through the pipes as well as getting some grounds sucked into the screen. Always good to get a little brush to keep those shower screens clean as they can get pretty grimy if you don't keep on top of it.

One way to check about the puck hitting the screen is to just load up the portafilter, pop it in and twist as if you were about to pull a shot, then take it out again. Should be undisturbed (you may see some water that has dripped onto it but that should be it).

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