Experimental prototype of bubblebed (fluidbed) coffee roaster. This is a non roasting experimental-only version to determine optimum perforated plate pattern.
I machined the drum from 303 steel which is corrosion resistant up to 1500 deg. The stainless wire mesh on the drum door allows the chaff to fall out. Inside the drum are two agitator fins that run the full length of the drum to insure even roasting of the beans.