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1-6 lbs Roaster Build - Nothing Fancy
There is an 1/6 rule of thumb, valid for almost all machines that roast using hot air.
1/6 should be read as 6 litres of roast chamber volume for 1 kg of greens.
An example is the typical dimensions in the 20x20 cm (8x8 in) ballpark, of the 1 kg machines drum.
Or 160 grams for one litre glass for a FB machine.

Actually, this rule is not so "of thumb"... it has a physical explanation, coming from an equation where you put heat capacity of air and coffee beans, and other constants... but nobody bothered so far to this level, just passed to the next, as coming from horse's mouth Grin
This is long overdue for an update. After a hiatus I've made progress on the drum.

The outer layer of the drum was welded on.
Drum squared up with my favorite spark maker.
Vanes twisted and welded in.
Perforated steel cut out and test fitted.

What's next? Finish the drum: weld on the back plate with perforated steel and remove the temporary spokes.
I don't know what's after that... we'll see.
UmMerkur attached the following images:
drumouterlayerbend.jpg drumspacers.jpg drumouterlayer.jpg drumperfback_1.jpg druminside_1.jpg

Edited by UmMerkur on 02/15/2023 1:12 AM
Behmor 1600+, Fresh Roast Plus 8, Poppery II; Lelit Bianca V2, Eureka Mignon Specialita', V60, Breville SGP
Great to see this project back up and running! A full blown classic type drum roaster build can be quite the challenge due to concept decisions, design peer review, combustion, metal works and electronics design and where the heck to start and then how to keep the project moving forward with all of our other life issues.

You'll get there!
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
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