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Homeroasters - Home Roasting Coffee Community » ALL ABOUT ROASTERS » WHAT SHOULD I BUY OR MAKE

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Building a roaster
Henrikp	#1 Posted on 01/09/2021 6:00 AM
Newbie Posts: 2 Joined: January 09, 2021	Does anyone have link or drawings for building a roaster ?.


renatoa	#2 Posted on 01/09/2021 7:52 AM
Administrator Posts: 2664 Joined: September 30, 2016	Type, capacity, heat source ?


Henrikp	#3 Posted on 01/09/2021 8:53 AM
Newbie Posts: 2 Joined: January 09, 2021	Type i am in doubt, about 600 grams in capacity, electrical heart source


renatoa	#4 Posted on 01/09/2021 9:05 AM
Administrator Posts: 2664 Joined: September 30, 2016	A turbo oven lid based setup is the simplest and most effective solution you can approach. Check for KKTO/SCTO/"turbo oven coffee roasting" acronyms.


jkoll42	#5 Posted on 01/09/2021 3:25 PM
1 1/2 Pounder Posts: 860 Joined: February 14, 2011	Heat Gun Bread Machine would be in your capacity range as well -Jon Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3


renatoa	#6 Posted on 01/10/2021 3:00 AM
Administrator Posts: 2664 Joined: September 30, 2016	Average roasted coffee density is 432 grams per liter, so you will need a larger model, at least 1.5 l capacity to fit the beans when level, significantly more if you don't want them spill when agitated. The 1:6 rule used for drums would say you need a 3.6 l roasting chamber.


jkoll42	#7 Posted on 01/10/2021 6:28 AM
1 1/2 Pounder Posts: 860 Joined: February 14, 2011	Quote renatoa wrote: Average roasted coffee density is 432 grams per liter, so you will need a larger model, at least 1.5 l capacity to fit the beans when level, significantly more if you don't want them spill when agitated. The 1:6 rule used for drums would say you need a 3.6 l roasting chamber. If you are talking about a HGBM a standard (in the states they are called 2 pound models) bread machine has more than enough enough capacity for that bean load with agitation. I roasted for years with this setup - it's still retired in my basement. -Jon Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3


renatoa	#8 Posted on 01/10/2021 7:38 AM
Administrator Posts: 2664 Joined: September 30, 2016	The large machine you wrote above seems to have 3 litres, indeed it is good for 500 grams of greens: https://www.doves...d-machines However, I feel the need to clarify this size requirement... there are also thermal issues beyond canister capacity. The same reasoning that led to the 1:6 rule apply here, and for all roast machines as well. To perform the roast, coffee beans needs a given energy to be transferred from hot air. The energy stored in air is a factor of volume and temperature, (and other physics constants we can't change). If you reduce the air volume, the only way to raise the beans temperature at right rate, is to raise air temperature. But we have the 270 C limit, where cellulose melt, and bean matrix suffer damages. I seen a lot of people claiming they roast a pound in the small model machine, the 800 grams model, that is predominant here in Europe, omitting the little detail they dial their hotgun well above 300-330 C, which is torture, not roasting, imo. If needed, another confirmation of the above comes from a commercial roaster: Gene glass has 1.5 l volume, why not load it more than 250g ? Rule 1:6


CupOfJoe	#9 Posted on 11/02/2021 2:08 AM
Newbie Posts: 1 Joined: October 13, 2021	Needing some guidance for the drum dimensions of a 2lb gas drum roaster. I found the 1:6 rule in the thread. Is there a rule for diameter to lenght?


renatoa	#10 Posted on 11/02/2021 2:08 AM
Administrator Posts: 2664 Joined: September 30, 2016	Close to cubic, i.e. diameter close to the length, but not mandatory. A typical 1 kg drum is 8" by 8" (20x20 cm) However there are a lot of commercial machines examples having longer roast chambers, like Gene or Behmor. Depends of the tube size you can supply. Edited by renatoa on 11/02/2021 4:42 AM


Koffee Kosmo	#11 Posted on 11/04/2021 6:00 PM
Administrator Posts: 1620 Joined: December 31, 2008	Quote renatoa wrote: A turbo oven lid based setup is the simplest and most effective solution you can approach. Check for KKTO/SCTO/"turbo oven coffee roasting" acronyms. It�s an easy build and assembly It will take approximately 1 hour once you have all the parts on hand With the mods I have made the roaster is capable to roast 1 kg and I still stand by the claim that the sweet spot is 650 to 750 grams KK I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
	Web

BernardJ87	#12 Posted on 11/11/2021 11:35 PM
Newbie Posts: 5 Joined: November 09, 2021	Good information.

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