I have just received my new American steel drum for coffee roasting.
According to the metal craftsman I found on eBay, I may now roast batches up to five pounds of coffee at a time on my gas grill with a rotisserie.
First test roast of 3.5 lbs green beans
The drum is filled with beans and the rotisserie turns the drum!
Depending on ambient and grill temperature, after 20-40 minutes we can hear the beans go through their first crack, giving a popping sound as their core temperature has risen to 390 F (200 C).
As the core temperature reaches 440 F (225 C) the weaker second crack is heard.