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10/15/2019 2:02 AM
They seem to be after the shoutbox. They have been removed. I don't see anything in the forums.

10/14/2019 3:27 PM
We have been hacked. A whole lot of posts that have filled up the whole forum.

10/10/2019 4:49 AM
Honduras Royal Reserve today.

10/08/2019 11:29 AM
Hi RAZ. Please post your 18-25kg build question in either the drum or fluidbed build forums and we'll all try to answer.

10/08/2019 10:43 AM
Quien me pude ayudar por favor, con el diseño para construir un tostador que funcione ya sea con Gas, electricidad o flujo de aire caliente, de unos (18 o 25) Kg. estoy en Venezuela

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Drum Roaster Advice and Discussion
Hey guys! New here, but trying to find my way to a well-engineered home-built roaster. I'm a custom motorcycle builder by hobby, and cloud engineer by day, so I'm no stranger to design and fab. However, I understand there are nuances to things like this, and would like to stay on a budget. Trial and error can be substituted for the wisdom of those who have walked this path before me in many cases. With that, here's my plan so far, tell me what I should change:

Heater: Propane, maybe a "sheet burner" like this: This is a Deidrich burner, where would I even begin?
Valving: Needle bypass and solenoid for high-low function control
Drum: Stainless, 8". Could this work?
If not that, where can I find a stainless pipe for something like this? Aiming for 1/8inch or a little thinner for profiling.
Front and Back: 8mm aluminum plate, laser cut and beveled by contacts at a local machine shop
Inlet: Stainless plate hopper, with tube to cyclone behind the roaster
Motor: Nema46 LARGE stepper motor with controller: I had this lying around, this level of speed control should be fun
Other things to be figured out later on.

Glad to be here, looking forward to learning!

Are we talking about a ceramic burner like this?

Yep, after some research I’m finding that they’re pretty generic grill-dear infrared elements. Would this be suitable for a solid drum? My other option is a pipe burner, or a pipe with 3-4 small Venturi heads tapped into it and pointing up.
Infrared seems like a gentler heat transfer method than a direct flame...
Edited by renatoa on 10/10/2019 8:43 PM
renatoa wrote:

Infrared seems a more gentle heat transfer method than a direct flame...

That's what I was thinking. May go with a mild pipe for the drum for more heat conductivity. Seems like that would provide a nice middle ground without being too costly.
Here's a new one: Has anyone used a LARGE stepper motor for the motor drive? I have a very large stepper that I'd love to include in this project, for no other reason that it gives an obnoxious level of drum acceleration control, plus it's on my shelf. The torque curves show it will produce at least 5 Nm during a fairly aggressive acceleration curve. I think I may go for it!

In other news: burner control is nearly done. It's pressure tested for leaks, and ready to attach the burner. I'll post up my burner details soon.
Here’s the burner idea! Still a proof of concept till I can get thicker square stock, but these are “jet burner” replacement nozzles. Less than a dollar at a local restaurant supply. And they burn HOT! I’ll put about 10 of them in a row, then weld an end cap on the square tube to thread into.
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