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Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Fluidbed Roaster

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Roast Case
poejokiller	#1 Posted on 03/28/2022 6:30 PM
Newbie Posts: 4 Joined: December 20, 2018	After a couple of months of roasting ultra-small batches in a popcorn popper, i figured it was time to move on to a proper setup. My wife had laid a well-defined wishlist (actually a had-to-happen list ?): The thing must be tidy, compact and concealable Must not make a mess Can't cost a fortune I had a wishlist too: Should be based on a fluidbed Should properly roast up to 500 g/1 lb of green coffee Should be controllable by Artisan Electric heating Should be (trans)portable I spent some time sourcing for such a thing, but found no perfect match: Sonofresco profile roaster 1 lb - $3k+ seemed too expensive, plus the gas thing makes me nervous Artisan 3e - Too bulky, too expensive at $4k CBR-101A - Right price, too small batch size at 250 g / 8 oz I know this may sound familiar, but I did go through this and other forums and found nothing that ticked all the boxes, either comercial or DIY. I must confess I was slightly biased towards a DIY project; as an engineer I always lean into building stuff myself, even if it ends up consuming massive amounts of my time and costing more than just buying the god damn thing the first place ? And so it did! It's been over a year now, but after several tuning iterations the project is mostly finished. So I thought I would share it with you guys, in case anyone is crazy enough to try and build it ?. After all, most ideas came from your contributions in this forum. I've been roastings tens of batches on it, and only a couple of them ended up bad. Never went back to the popcorn popper, never went back to roasted beans! Here's the thing: It's based on music gear flight cases (45 x 21 x 43 cm): It's guts: The Arduino, TC4 and ZCD surrounded by aluminum shielding: The beans dropping mechanism: The cyclone chaff collector: The anti-clog chaff rotating filter: Actually roasting: I'll be posting the BOM and all building details in this thread, stay tuned! And feel free to comment and discuss improvement ideas should you find this interesting. Disclaimer: This is just a hobby for me, I will not be selling or by any means making money out of this.


renatoa	#2 Posted on 03/29/2022 1:31 AM
Administrator Posts: 2430 Joined: September 30, 2016	Welcome and ... wow ! This treasure chest design is sooo ... "Fifteen Men ... and a Bottle of Rum" Seems CK has competition... finally Tough competition...


allenb	#3 Posted on 03/29/2022 3:29 PM
Administrator Posts: 3627 Joined: February 23, 2010	Hey PJ. I'll say you have definitely evolved! Amazing roaster! Thanks for posting. Keep us up to date on how your roasts cup as you go through more greens. 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


poejokiller	#4 Posted on 03/30/2022 4:15 PM
Newbie Posts: 4 Joined: December 20, 2018	Thanks guys. I'm attaching the BOM. It's under $500 in parts (but probably over $5000 in labor ). poejokiller attached the following file: roast_case_bom.zip [10.86kB / 172 Downloads]


Scorchy	#5 Posted on 03/30/2022 5:06 PM
Newbie Posts: 12 Joined: January 12, 2020	That's pretty damn sick. I mean, slick. Great work!


greencardigan	#6 Posted on 04/03/2022 7:28 PM
1 1/2 Pounder Posts: 1162 Joined: November 21, 2010	I like the bean drop sliding door! And the rest of the roaster!


CK	#7 Posted on 04/03/2022 8:38 PM
1/2 Pounder Posts: 226 Joined: December 07, 2018	Very nice design. Well done! I can relate to the "over $5000 in labour"... The commercial-grade box construction is great too. Have fun roasting! Technivorm Moccamaster, French Press, Aeropress GO, Ibrik, Moka pot, Breville Barista Express, Urbanic070s/static-free with zero retention mods, Breville SGP, Roaster908


oldgrumpus	#8 Posted on 04/03/2022 8:49 PM
1/4 Pounder Posts: 160 Joined: July 25, 2012	I love it. I'd like one too please. That also makes an excellent sample roaster!! Clever Coffee Dripper Grinder: Macap M4 Roaster: Completed drum roaster project photos shown here: Photos https://goo.gl/ph...Da6K4wfqw5 Videos https://www.youtu...Bd1NrdpSUH


JFA	#9 Posted on 04/13/2022 5:00 AM
Newbie Posts: 1 Joined: February 13, 2021	Wow that is impressive! I built a similar type of fluid bed roaster but haven't had the guts to post about it yet. After seeing your work, there's a lot to improve on mine! Could you show more of the top of the chamber? Did you build some kind of deflector to avoid blowing the beans to your chaff collector? Edit: Wait, that's probably the chaff filter you showed. Edited by JFA on 04/13/2022 5:45 AM


poejokiller	#10 Posted on 04/29/2022 11:38 AM
Newbie Posts: 4 Joined: December 20, 2018	Thanks guys! @JFA believe it or not, the filter was by far the most challanging part of the project. I tried multiple configurations for the filter, but either chaff would accumulate there and clog or beans would go through. It was only when I came up with the design that makes the filter rotate with the air flow that I was able to successfully and consistently roast 500g of green coffee in such a short chamber. I was thinking the chaff collector would give me the most trouble, so I was very surprised how effectively it worked right from the first attempt. The container itself is very small, but there must be such high air pressure inside that every single bit of chaff is compacted, and literally zero dust comes out. My wife is happy!

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