Hey look! A modified Pavoni Pro

-


(Youtube version: https://www.youtube.com/watch?v=hnFnEcKWlXg)

My friends at Vintage Espresso Machines procured a number of vintage machines and since I was looking to give one to a friend I checked out a few of their Pavonis. I nice little brass colored Europiccola was in working order so I bought that one and two others which needed repairs were adopted as well.

One of these turns out to be quite interesting.

Bottom view
I had no idea what exactly had been done to it, but Tije de Jong pointed out to me that a previous owner must have found an original way to prevent overheating while keeping up boiler pressure.

Close up of pipe feeding water to brew group
The brew head is not fed with a pipe dipping into the boiler water but instead a short pipe enters the boiler from below and the boiler water in this pipe takes a trip around the foot of the Pavoni before punching upwards through the plate just in front of the boiler and then reaching all the way into the throat of the brew group.

close up
This way, the brew group which is heated up by the hot boiler, is fed by cooler water from the pipe and if this is well balanced, it could result in an excellent pre-infusion temperature at probably a higher than normal pressure.

Currently the thermal fuse seems to have quit so next week I will take this machine (and the other two) to Peter van der Weerd at Kafko to get them fixed.

I also took a few pictures looking into the boiler from the top. It seems the 'normal' entry point of water/steam into the group has been closed off. So the copper pipe feeds the brew group and it is not a circular 'thermosiphon' concept.







Reacties

Een reactie posten

Populaire posts van deze blog

Tiny Cheap Fluid Bed Roaster by Tije and Jan

-
Afbeelding
(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
Meer lezen

Finished Pavoni & Fuji PXG4 pid: Probe Inside the Ring

-
Afbeelding
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
Meer lezen

TC4+ boards and Arduino controlled roaster by Matthias Gerstgrasser

-
Afbeelding
illustration by Matthias Gerstgrasser On the mailing list for Artisan users , Matthias Gerstgrasser posted a report about his coffee roaster project, with a link to a beautifully illustrated, complete step by step guide of his work on Instructables: A while ago I posted a few messages on here regarding automation for my hot-air popcorn roaster, and was asked if I could share a writeup of what I had been doing with my setup. I know it’s been a long time, but I haven’t forgotten, just got a little sidetracked (more on that below). I have finally found time to do this over the last few weeks though, and compiled a step-by-step guide of how I modified my popcorn machine. This is now available on Instructables: https://www.instructables.com/id/Arduino-controlled-DIY-Coffee-Roaster/   Do let me know if there’s anything missing or anything that could be improved. I intend to keep updating the guide as I find ways to improve it or as new developments occur. I am also discussing b
Meer lezen