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Koffee Kosmo
OfflineAdmin
· 08/12/2020 5:37 PM
And I thought it was just me that couldn't access the site All good now - coffee kept me company

JackH
OfflineAdmin
· 08/10/2020 8:46 PM
Had to make myself another cup of coffee to get through it.

snwcmpr
Offline
· 08/10/2020 7:33 PM
I went into withdrawal for a bit. Now .. all is good. roar

mtbizzle
Online
· 08/10/2020 7:26 PM
Yeah Jack I think so, I couldn't access for a bit

JackH
OfflineAdmin
· 08/10/2020 6:51 PM
Did we lose the site for a while?

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Roaster Choice Discussion
CharcoalRoaster
DISCLAIMER: this is a post intended to start a discussion re: roaster choices not a build or technique thread. As this forum has always stated -- roast with what gives you coffee that you like to drink. But for this thread my curiosity was raised as a result of a few recent posts in a drum build thread (credit to Renatoa for the inspiration behind my desire to dialogue about this) ThumbsUp

I roast on a DIY 1lb Fluidbed but was considering a drum build for fun. In looking around the forum for tips and tricks I came across a post from Renatoa questioning the desire for a drum build when a TTKO (or two!) is sufficient and better for heat transfer and some other reasons I can't recall right now. I know there have been myriad discussions re: FB vs. Drum vs. TTKO, etc. but it got me thinking.

If drums are tricky, have inefficient heat conductivity, or any other reason one could/would advocate for a different roaster then why are they industry standard?
 
pisanoal
Removed my post
Edited by pisanoal on 12/16/2019 1:49 PM
 
renatoa
Because they scale the best, I guess... There is nothing significantly different between 1 kg and 50 kg drum roasters.
But wait a bit... there are a lot of examples where a solution became industry standard without being the best... quoting only the one that hurt me the worst, Betamax vs VHS.
I have nothing against the drum as an agitation method, but as heat transfer. My next build probably will be a drum with heat source inside the drum, hot air or ceramic plate.

PS: glad to inspire other question their choice...
At very first quick reading I thought you stole my thread I want to start for long time ago... but no, that is about fluid bed Grin
 
renatoa
Every roaster build, if done crappy, will look and feel as is...
I expect to discuss here principles, not disappointment about personal experiences. This could be due to lack of skills, or equipment, or other reasons.
And led to false statements, like BT placement... conversely, TO is a machine allowing to the closest measure of temperature beans themselves, without minimal airflow influences, much better than the others.
Agitation also, can be improved dramatically if placing a 2 cm raiser on one side of the machine support. When mass bean is no more completely horizontal, the agitation and output uniformity is much better.
And other similar build tricks, that I am sure exists for every specific roasting technology.
If you want to talk about a serious drawback of TO designs I seen so far, is about the charge and drop methods... never seen so far an implementation with a charge without heat loss, or a quick drop, as drum has. These are the places where a TO still need improvement.
 
CharcoalRoaster

Quote

renatoa wrote:

Because they scale the best, I guess... There is nothing significantly different between 1 kg and 50 kg drum roasters.
But wait a bit... there are a lot of examples where a solution became industry standard without being the best... quoting only the one that hurt me the worst, Betamax vs VHS.
I have nothing against the drum as an agitation method, but as heat transfer. My next build probably will be a drum with heat source inside the drum, hot air or ceramic plate.

PS: glad to inspire other question their choice...
At very first quick reading I thought you stole my thread I want to start for long time ago... but no, that is about fluid bed Grin


Now you've got me curious! Start it!woohoo
 
Koffee Kosmo

Quote

If you want to talk about a serious drawback of TO designs I seen so far, is about the charge and drop methods... never seen so far an implementation with a charge without heat loss, or a quick drop, as drum has. These are the places where a TO still need improvement.


You have to understand that any design can be improved if one is willing to pay for the privilege

The TO design principle can be updated and upscaled with a more advanced heat control system and automation if one is willing to go that far

I have a forced air design principle ready to go for the heat system - but not the software to control it

For the home roaster this can be achieved with small TO mods to the thermostat unit but one must be watchful during the roast

The thing is with a KKTO design one can roast larger amounts than most small commercially available units at a fraction of the cost

########
As to why I designed this type of roaster
With many Voltages around the world It can be used in any country as the drive system is 12v and the local voltage equivalent TO can be purchased
It’s clean to use as it collects all the chaff ( this was my wife’s request )
It has a small footprint
It roasts large amounts of coffee at one time saving on electricity and time costs when compared to multiple roasts

KK
I home roast and I like it
Blog - http://koffeekosmo.blogspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
CharcoalRoaster
KK -- What's the largest batch size you can pull off?

EDIT: I just found the old post where you offer up a dual TO design that flows into a drum. That coupled with Renatoa's comment would make it seem like doubling capacity of the original TTKO?
Edited by CharcoalRoaster on 12/21/2019 3:02 PM
 
Koffee Kosmo

Quote

CharcoalRoaster wrote:

KK -- What's the largest batch size you can pull off?

EDIT: I just found the old post where you offer up a dual TO design that flows into a drum. That coupled with Renatoa's comment would make it seem like doubling capacity of the original TTKO?


The original sweet spot capacity of a KKTO is 650 grams of green coffee
As I became more familiar and gained experience that capacity has risen to 1 kg batches
But I have roasted 1.2 KG batches from time to time

The roaster has roasted several thousand times in the 10 years since being built - and still using the original drive motor
My normal roast now is 1 kg

KK
I home roast and I like it
Blog - http://koffeekosmo.blogspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
CharcoalRoaster
In the single TO setup or the multiple TO setup to achieve 1kg loads?
 
Koffee Kosmo

Quote

CharcoalRoaster wrote:

In the single TO setup or the multiple TO setup to achieve 1kg loads?



Single TO setup - with only a deflection plate alteration to the TO unit

However due to the nature of a DIY build and different wattage TO units - most users need to modify the thermostat on the TO to achieve this

The photo below is my roaster at 10 years old

KK
Koffee Kosmo attached the following image:
dca45aa5-2f55-4820-a195-ba22e7303e47.jpeg

I home roast and I like it
Blog - http://koffeekosmo.blogspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
CharcoalRoaster
Other than the convenience of the "lid factor" for the TO itself why not save the money and the hassle of manipulating the thermostat why not just use the heating element itself?

https://www.ebay.com/itm/1PCS-Replace...1438.l2649
 
Koffee Kosmo

Quote

CharcoalRoaster wrote:

Other than the convenience of the "lid factor" for the TO itself why not save the money and the hassle of manipulating the thermostat why not just use the heating element itself?

https://www.ebay.com/itm/1PCS-Replace...1438.l2649


Using a TO is more than convenient
The timer is also a safety device should you forget about the roast
The inbuilt fan multiplies the heat penetration and expels the chaff

KK
I home roast and I like it
Blog - http://koffeekosmo.blogspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
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