As inspiration for builing home-made drum roasters or roasters from converted gas barbeque grills, I wanted to share some photos of the Jabez Burns sample roaster. These two models below are not mine, but belong to Royal Coffee, a broker near our shop (where I cup participate in cuppings sometimes). Also see our description of perforated metals.


Here are the 2 banks fo sample roasters side by side. You can see the sample triers to pull out coffee during the roast. This open front design is abslutely ideal for total access to the coffee durning the roast.

The 4 barrel roaster is newer and has air-through-the-drum -see next photo- We ahd just roasted a bunch of Kenya samples so there's a lot of chaff everywhere. (You really don't have to pull the chaff out of the drum while roasting -you can just separate it after - but we were being picky for the Kenya cupping).

Here you can see the the air manifold that pulls air through the drum, and how the drum barrel hinges forward to dump into the cooling tray

The drum is perforate metal with agitating fins. It has is a cylinder shape with a coned front end. In the rear it is mounted on the drive gear, but so the front can remain open it runs on a groove inside the front opening.

Here is the gear that drives the rear -this is the 5 barrel one because it lacks the air manifold

The gear is meshed into a worm-drive gear on a lateral rod

The lateral rod is driven by an electic motor at the base, with a long belt between the pulleys. This keeps the motor away from the heat.


The sample trays have a strong air flow pulling down through them and they cool the coffee very quickly. (Air flow cools coffee, not physical agitation).

Here you can see the burner, a very simple round flame like a gas stove, or like a Colman Camp stove that runs on white gas.

 


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