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· 02/17/2020 7:01 AM
how can i calculate my roasters drum size?

· 02/11/2020 1:10 PM
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· 02/11/2020 9:35 AM
The Behmor lol

· 02/10/2020 10:25 AM
is a member.

· 02/06/2020 7:24 AM
Searched but no can find, but does anyone on here use the roasters made by CRC (Coffee Roasters Club) in Connecticut?

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Heat Source Behind Drum?
Hi All! New member here and tossing around ideas on building a drum roaster. Nothing big, maybe 1 kilogram size. I'm looking at putting either a solid drum or perforated drum inside an insulated steel tube. Any ideas about putting the heat source in the back behind the bean drum instead of underneith. Preferably an infrared. Your thoughts would be greatly appreciated.

Why this preference?

The back is where usually the motor is placed, placing heat there will force you to extend the drum axis, to remote the motor.
Also, some heat will waste even if the tube is sealed, because the natural behaviour of heat is to go up, above the tube.
Thanks for the feedback. I had same concern with heet not circulating the whole space around drum with heetsource being in back. My setup will be basically the bean roasting drum within a outside drum. Outside drum demensions is 8 inch diameter by 12 inches long. I was tossing ideas around of the best size for roasting drum size. Couple ideas was a drum size of 6x7 with heatsource in back or 5x10 drum size with flame heat underneith. What are thoughts on roasting drum length being 2 X the Diameter (5x10) with beans shooting out front gate. Will beans mix well enough?

Which quantity, which drum volume ? 1 kg requires 6 litres, a formula you can find here and elsewhere.
Is your drum large enough ? I don't think so... my computations give 3 litres for both drums sizes above.
In a 14x23 cm drum I tested in the past, close to your drums volume, wasn't able to roast evenly more than 600 grams.
DIY: TO based IR to bean 750g
Moded commercial: Dieckmann RoestMeister, Nesco, popcorn.
TC4ESP, PID controllers, MS6514 USB/Artisan/Apps
Grinder: MBK Feldgrind, mod'ed Porlex to 47 conical burrs, vintage PeDe Dienes
600 grams would be great. This would give me just over a pound of coffee after water is extracted from beans. So if roasting 500-600 grams you think the 5x10 drum will work if properly placing fins inside drum?

5x10 is a notch smaller than 14x23 cm... hmmm...
500 yes, 600... you will find :)
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