One way to use the COLINO coffee bean screens

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Finished Pavoni & Fuji PXG4 pid: Probe Inside the Ring

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Delicious cup: all the work was well invested! At the end of the previous blog about the pressostat and PID working together , I mentioned that I would like to clean up the xmas tree of wires and have as few cables and probes as possible to visually disturb the classic design of the La Pavoni. Getting rid of the probe that was fastened with copper tape to the top of the brew group was a priority. I wanted to hide a new probe in the cooling fin as close as possible to the brew group. This morning I asked Tije if he could do that. He would need to drill a straight hole of 3mm diameter in the 4mm inner ring of the cooling fin that sits as a tight clamp around the brew group. Always the optimist, Tije set to work: First, Tije made a piece of aluminum to fit the inside of the ring. Drilling a thin hole straight through the curved aluminum, if possible tangentially going through the inside of the ring to touch the brew head directly, you need the support of the temporary insid
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Tiny Cheap Fluid Bed Roaster by Tije and Jan

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(also see Daily Coffee News feature ) Tije designed and made the following structure for a tiny and cheap fluid bed roaster, to which Jan van der Weel added the Arduino parts, electronics and programming: Sketch by Tije de Jong Jan sourced a very cheap blower (€ 11) to start with, Tije developed and constructed the mechanics, Jan built together and programmed the TC4 / SSR electronics.  On his blog, Jan will specify exactly how the TC4 part is combined and programmed and I will copy these details into this blog entry, just as Jan will use this video in his blog. We did a few test roasts to make sure it works at all and it does. Towards the end, the first roast tended to get a flat BT line and airflow was slightly decreased. 200g seems max load of green beans. Second roast a little more power was given to the heater. Next we will try the Background Roast driven by the PID software of Artisan. A week later, with updated software that works better to change the fan
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Espresso brew pressure profiling: dual OPV on the Rocket Giotto

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Yesterday morning I took my Rocket Giotto to visit Peter van der Weerd from http://www.kafko.nl in his espresso machine workshop. He has made me a temperature probe to fit in a portafilter basket:  (I will post more about this nifty device soon) Since I was there anyway, he took an extra back panel and cut out a square so I could change the setting of the OPV while working with the machine. This way, I wouldn't need to disassemble the covers if I wanted to change the brew pressure setting: I  had been lowering the brew pressure on the OPV but noticed that it would leak water when turned down below 8 bar. Here a few images of this original OPV connection: To be able to easily change the setting of this OPV through the back panel opening, Peter created a bend in the spanner:  An image of the spring inside this OPV: Peter could cut the spring to allow the threaded part to go in deeper but he didn't like this idea as the spring has its own u
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