2021 Share your DIY roaster build

Discuss roast levels and profiles for espresso, equipment for roasting coffee.
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MTN Gert

#1: Post by MTN Gert »

I love to see how creative people have been over the last year. Share your DIY build and feel free to elaborate on any innovation or clever uses of everyday components.







"Stop it....it's naughty and wrong" -James Hoffmann

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drgary
Team HB

#2: Post by drgary »

Dave,

Can you tell us more about your roaster and the thinking and build process that went into it?
Gary
LMWDP#308

What I WOULD do for a good cup of coffee!

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Vince_in_Montreal

#3: Post by Vince_in_Montreal »

Wow that is seriously awesome. As Drgary said we would love to hear more. Have you fired it up and roasted a batch? We need to hear Moar.

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MTN Gert (original poster)

#4: Post by MTN Gert (original poster) »

Thank you so much for the high praise.

I finished up the roaster project in October and have been roasting 10lbs a week for myself, Co workers, local radio hosts and local espresso equip dealer.

Some specs:
0-100 rpm variable speed DC gear motor
.25" 304ss drum with kerfed turbine blades
100,000 BTU low pressure propane burner with needle valve
300cfm fan for cooling tray
300cfm fan with throttle body style air flow control
The entire body is .125 304ss
Bean temp probe, and ambient temp probe
5lb roast capacity but 1-3lbs gives the most control

Between drum speed and air flow control I am able to precisely control the drying phase with conductive heat and quickly transition into convective heat to complete 2lbs of coffee in 8minutes.

Total project cost was $1400 vs a commercial machine this size would be $10,000.

I'm happy to answer any specific questions too!
"Stop it....it's naughty and wrong" -James Hoffmann

Capuchin Monk

#5: Post by Capuchin Monk »

I would love to build my own roaster but don't have the tools and room to do it. :(

Do you have any video of it in operation?

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MTN Gert (original poster)

#6: Post by MTN Gert (original poster) » replying to Capuchin Monk »

No I don't have any videos yet but that is a good idea. I'm not into video editing but I could do a 9min roast along video and roaster tour. Tools were pretty basic but I did end up with a plasma cutter at the last 5% of construction. Wish I had bought one earlier.
"Stop it....it's naughty and wrong" -James Hoffmann

Capuchin Monk

#7: Post by Capuchin Monk »

Where did you buy the fans, bearings, sheet metal and pipes from?

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drgary
Team HB

#8: Post by drgary »

Have you thought of venting the exhaust so it goes outside?

Diacetyl in Coffee Roasting and Grinding
Gary
LMWDP#308

What I WOULD do for a good cup of coffee!

Vince_in_Montreal

#9: Post by Vince_in_Montreal » replying to drgary »

Excellent point.

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MTN Gert (original poster)

#10: Post by MTN Gert (original poster) »

Motors, fans, bearing were purchased as sirpluscenter.com
Metal was purchased locally
Odds and ends were often amazon

Yes I did think about venting it outside. I just roll it outside or as close as weather permits for now. Cutting holes in the house for a hobby is a big commitment haha. Very little smoke on anything but dark roasts.
"Stop it....it's naughty and wrong" -James Hoffmann