Today, Tije nearly finished the new Transparent Portafilter. When the sealant has hardened and some final polishing is done, it's ready for action.
Steps taken
The polished 'puck' is first covered with a transparent protective tape. Then the existing hole is drilled out to be much bigger, followed by the lathe cutting out a tiny sliver at a time from the inside out, widening the inside hole and slowly turning the 'puck' into a short 'bottomless basket' with an outside rim on the top and an inside rim on the bottom where the metal mesh bottom will be fitted.
Small disaster
Despite the utmost care and the tiniest steps taken with the two delicately sharp cutting tools made by Tije for the task of cutting out most of the bottom of the 'basket', at one point the lathe lost its grip on the basket which damaged the top rim a little, also leaving a deep scratch on the outside of the basket.
Finishing this prototype
Tije wanted to start making a new one right away but I voted to first finish this one. We have learned that this last cutting out of the bottom needs to be done by a drill, followed by careful filing. We might learn more as we move on and then, a next version can be produced even better.
Protective tape around the 'puck'
Cutting the excess tape
Puck in the lathe grips
Drilling out the inside hole
Transparency shows the drill at work
The hole must be widened to leave a strong walled basket
Tije at work
Cutting, tiny step by tiny step
Needs more widening
Next, the bottom needs to be cut out, leaving a little 'lip' to support the metal sieve
Lining out the cutting tool
Polishing the inside of the wall
Wall is getting clearer
The bottom needs to go still
Tije filed out this cutting tool
Carefully cutting away
Tije at work
After the little disaster of the lathe losing grip, Tije cuts the rest using the sharp disc
Making the rim more even
Basket sitting on the sieve for size
Making the sieve fit exactly
Measuring
The sieve will fit now
Getting out the sticky goo
Goo to keep the sieve in place and seal off the rim
Goo to stick the transparent basket in the bottom of the bottomless metal basket
(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
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
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
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