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My U.A.F. hot air roaster (Dedicated to renatoa)
This is a sneak preview of a loft test in Mk. 2 of my hot air roaster. I know for sure that the prototype worked fine at low 1kg batch weight and I was actually offered an award winning bean once my machine was stable but I wanted a larger and more robust roaster that's capable of being automated. Have thrown in a lot more time and money on Mk. 2. It's not ready yet but if your blower can lift the beans and you've already upped your heating element's capability, you know you're in business.

I've been bugging renatoa God knows how many times for help mainly on the TC4+ and Arduino side. It's just me. I'm a lazy shit who's too lazy to go figure out that part by himself so renatoa, thank you so much for the months and months that you'd been so patient. Everything's working fine now but the project still needs a few more pieces from the metal workshop before I can start roasting again.

The first part of the video of the roaster was actually taken a few days before the segment of the beans bouncing about in the hopper. Last part was to show viewers how much beans I was testing with. The heating chamber will be encased in a thick layer of rockwool and placed into a mild steel compartment. In Mk. 1, the surface temperature of the compartment was only a little above ambient which surprised me lots. After back to back roasting of 9 batches, it was barely 40+ degrees Celsius.

And below was the first time roasting a drinking batch in the prototype aka Mk. 1. I was happy as f**k and a little surprised nothing exploded Roflmao when I turned the entire machine on for the first time.

Edited by progen on 07/21/2022 9:16 AM
This is Mk. 2's control panel and laptop stand. There'll be another USB monitor somewhere too. I used a 3 switch combo because of the limited space on what was previously the mousepad. No worries about the high power to the heater because there's a 40A contactor handling that. Ignore the purple strap holding down the control panel. The horizontal tube has been welded now and the whole thing is very stable although I might add another vertical tube below the laptop section for greater peace of mind.

This was a trial layout with Mk. 1.. Obviously the monitor wouldn't like to be near anything hot but the rockwool encased heating chamber ensured that the heater chamber's secondary chamber was only slightly above ambient temperature. I could rest my hand on it for the entire roast. No worries there because in Mk. 2, the secondary monitor will be positioned somewhere else. Was just a Because I can moment.
Edited by progen on 07/21/2022 9:20 AM
Hey progen, looks like lots of good forward momentum on your fluidbed build! Shoot photos and cupping Q notes when you've got it all finished and dialed in. Nice to see larger fluidbed builds in action.
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


allenb wrote:

Hey progen, looks like lots of good forward momentum on your fluidbed build! Shoot photos and cupping Q notes when you've got it all finished and dialed in. Nice to see larger fluidbed builds in action.

I had to be really careful with the knob but luckily the VFD provides a fairly linear change instead of like when using a voltage regulator in single phase mode.

Need to fabricate an extension of maybe 4 - 5" because it's no use having a blower and heater combo that can handle 3kg only to have beans flying out mid roast. And that's something I definitely can't afford because I'm planning to go into higher end stuff like say USD30 - 50 / lb kind of thing.
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