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08/18/2019 4:31 AM
Awesome I sent an email to AllenB and JackH The email to JackH failed. I had screenshots of my settings.

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I got another PM last night......... No email notice.

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Home Built Drum Roaster
Hi Guys

Thought I should post some pics of my home built drum roaster and see if anyone has any suggestions. The roaster was built by one of my friends who is an engineering student for his years project. I removed all of the electronics that he had in it for gas control as I believe it was a bit dangerous and now have a manual system with electronic sensors to measure bean temp and air temp.

The roaster uses the 12V electric motor from a golf caddy along with a bit of electronics to control the speed (otherwise operated like a spin dryer :-)). It uses the ceramic burners from a chicken roaster (would open flame be better perhaps?) and I have a variable pressure regulator connected together with an auto-shutoff for the gas if the flame goes out.

Bean cooling is done using a radiator fan from a car underneath the bean tray, I have been thinking of using the fan/motor from a leaf blower, to suck not blow obviously, and was wondering if there is a disadvantage to cooling the beans down to quickly?

Air flow is to a stainless steel vacum cleaner base (chaff collection unit) and then up to a fan which provides the suction. The air is routed using some gutter piping which you can see in the first photo, I can adjust the suction using a hole in the gutter pipe which can be opened or closed.

I am currently using the roast logger software from to capture the bean and air temperatures. Bean temp is via the USB port using a Victor 86c DMM with the temp probe at the front and then the air temp via a cheepo DMM with a temp probe at the back. I use the OCR feature of the software, works pretty well but more finecky than the straight USB connection obviously.

Roast Logger software

Front Probe

Rear Probe

She has been operating now for 3 months and am still developing her and working out some kinks but she has been working like a bomb with very even roasts in between 12-18 minutes depending on roast size, max seems to be around 2.2kg's.
Nice roaster I may want to pick your brains on dimensions, burners oh and everything :) I am in the early stages of drawing up a 2.5kg roaster.

Bean cooling faster is better and if you suck rather than blow you may be able to collect a bit more chaff rather than blow it around the place.
My name is Tim and I have a coffee equipment addiction problem :)

Two Hottops - modded
TJ 067 Electric 1kg 5+years old
Insert new 5-8kg Roaster here urgently BBQ grill
Suck is definitely the best option, blowing using the leaf blower may result in the beans being pretty evenly distributed over the patio :-)

I am trying to get the plans for the roaster and maybe open source them so that enthusiasts can build their own machines.

Very cool roaster! Thanks for sharing! And clever to read the hand-held's screen via webcam.
You have a valuable roaster there, Sc00bs! Any shots of the construction, or the drum?

Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
Looks like the roaster Boom built on here. http://forum.home...ad_id=1470

Lots off build pictures.
Edited by seedlings on 05/07/2010 3:25 AM
Ringo wrote:
Looks like the roaster Boom built on here. http://forum.home...ad_id=1470

Lots off build pictures.

Winner, winner, chicken dinner! Good eyes, Ringo.

Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
It is Neil's roaster (Boom), I took all the electronics out though and replaced them with a more simple (and safer) control system.

I am still in process of building a drum roaster, I think you have a good one. As I planned mine I copyed many of his ideas. As far as cooling the beans, the faster the better. Changing burners, if its working I would not change, there are comercial IR burners in coffee roasters, maybe a little slower to react but that can be a goofd thing, as long as you have all the BTU's you need to finish the roast fast enough I would just enjoy the coffee.
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