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JackH
10/15/2019 2:02 AM
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Hi RAZ. Please post your 18-25kg build question in either the drum or fluidbed build forums and we'll all try to answer.

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10/08/2019 10:43 AM
Quien me pude ayudar por favor, con el diseƱo para construir un tostador que funcione ya sea con Gas, electricidad o flujo de aire caliente, de unos (18 o 25) Kg. estoy en Venezuela

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Honey Badger 1k
jkoll42
Quick update. Strange 1C temperature of first roast must have been a fluke. Did 2 back to back roasts at my friends and 1C hit at 404F and 2C (espresso) hit around 442F which was basically where the HGBM hit so temps are solid now. Also, slightly tilted machine about 1/2" and solved the few burnt beans. Thanks for that tip.

Overall impressions -

This is an extremely easy machine to roast with. Temp control is easier than with the heat gun which I believe is mainly due to instant temp changes of the flame. There is absolutely no tipping or scorching and bean color is extremely even. I do think I will get the smaller sievert burner. The 2941 was running at about 3psi (operating psi is 30). We were roasting in a detached unheated garage with ambient air at 35F and even without insulation around the vessel things went perfect. I though I might have to insulate it but there is no need.

I have been drinking the first roast of Rwanda which due to the temp readings probably didnt have the profile I wanted. Still very good. I took it to C/C+ and it is well rounded and has a really nice juicy fruit finish. A very 'wet' coffee which is nice. There was question if the incinerated chaff might taint the cup but I can't pick out any off flavors and I think they would be apparent at such a light roast. It makes for a nice light show in the vessel - blue flame and swirling embers. I also believe there is enough agitation to at least roast 3# - maybe more but I don't feel like wasting a batch of beans to find out!

Jon
Edited by jkoll42 on 03/01/2012 1:46 AM
-Jon
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3
 
oldgearhead
Very nice job!
:)
No oil on my beans...
 
jkoll42
I know I always love roaster videos.... so here are some roaster videos! Just a few short ones. Burner on, empty. Burner on 2# load of Yirgacheffe, pyrotechnic display as the chaff burns off, and audible 1C. Enjoy!

Also found out that I really need to order that smaller burner - 60F ambient tonite and the burner was nearly going out - at about 2PSI just to control the roast.

[video]http://www.youtube.com/watch?v=EiJs8bVazLI[/video]

[video]http://www.youtube.com/watch?v=yxtPfC13rWk[/video]

[video]http://www.youtube.com/watch?v=uNanY4gA1b4[/video]

[video]http://www.youtube.com/watch?v=b1JdwyEmYCA[/video]
-Jon
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3
 
allenb
That's some real fire power!

Will the smaller burner fit without modifications?

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
jkoll42
Allen - yes it will. I had a feeling that I would have too much heat from that burner so I designed it to be easy to change. 30 seconds tops :)


-Jon
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3
 
seedlings
Jon! You have yourself a super-practical, functional and great-looking roaster! With a little height added to your beater, and perhaps a second vane on the opposite side, that roaster could fire up a huge batch of beans. Great videos, great write-up. Well done!!!

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
JETROASTER
Nice machine, nice post! Thanks for the vids. -Scott
 
allenb
Not only does HRO have the first (that I know of) direct flame home-built roasters but it has two totally different varieties: direct flame drum and direct flame SCTO.

Now Scott is going to have to add a third variety, the DFFB, Direct flame fluidbed.;)

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
seedlings
allenb wrote:
Not only does HRO have the first (that I know of) direct flame home-built roasters but it has two totally different varieties: direct flame drum and direct flame SCTO.

Now Scott is going to have to add a third variety, the DFFB, Direct flame fluidbed.;)

Allen


We've also had a direct-flame breadmaker & torch roaster :)
http://homeroaste...ad_id=1029

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
jkoll42
A little update. My new burner came in last week and was able to swap it out and roast two batches over the weekend. The lower heat output matches the roaster much better. They are 30psi/2bar rated for max output and the roast ranged from 20 to 10psi so I still have overhead but didn't have to bring it down to stall speed. It is also much easier to keep tighter control on the ROR since a small change in pressure does not equal as huge a change in heat output as with the larger burner. It's a keeper! I though it might be interesting to see the size comparison of the two burners so here it is (ruler is in inches). Top burner - sievert 394102 (3.1kw). Bottom burner - sievert 294102 (7.7kw)

Jon

farm8.staticflickr.com/7040/7018987599_e38ee7eb19_b.jpg
-Jon
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3
 
jkoll42
Update #2

The axial fan I was using just didn't push enough pressure to get the circulation I wanted in the chamber. The smoke was getting trapped in there and giving a slight off flavor to the beans. To test things out I pulled the retired poppery I out and ran flex duct from it (I have the fan/heat circuits seperated) to provide airflow over the burner. This turned out to be just the right amount of air. Off flavor is gone and the smaller burner still has enough heat output despite the significantly larger air turnover.

Any ideas for a compact blower unit with a similar pressure output as a popper so i can integrate it into the roaster and ditch the duct?

The other somewhat surprising thing I have noticed is in the rest period for the beans. My old hg/bm usually peaked about 3 days post roast and specific flavor notes declined noticeably after that. With this setup, peak flavor seems to be more like 4-5 days out but is more developed and complex and it holds those notes with nearly no degrading.

Any thoughts? The only variable I can think of is the influence of the direct flame.
-Jon
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3
 
JETROASTER
jkoll42 wrote:


Any ideas for a compact blower unit with a similar pressure output as a popper so i can integrate it into the roaster and ditch the duct?



Does this blower need to handle heat? -Scott
 
jkoll42
No, it is behind the heat source.
-Jon
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3
 
JETROASTER
For a pound of something tasty ...it's yours! 4" single fan. -Scott
JETROASTER attached the following image:
4inchsingle.jpg
 
jkoll42
Winner Winner Chicken Dinner!!!

PM
-Jon
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3
 
John Despres
That fan is worth a mound of beans...

Good on you, Scott!

ThumbsUp

John
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
 
www.sceneitallproductions.com
JETROASTER
Ok, it's headed your way. Hopefully it will do some good. If not, I'll find another.

I started throwing blowers into our recycle collection. I accumulate roughly twenty a week....most are completely funtional!
Todays vacuum cleaners seem to fall apart long before the motors fail. ....sign 'o the times. -Scott
 
bryce_wes
I am interested in making a "clone" of this roaster. I currently am using a popper but want to move up in the amount of beans that I roast. I am hoping by staying with a hot air machine that I can maintain similar results to what I achieve now. This project jumped out at me because I have almost all the parts on hand. I just have a couple questions.

First, do you just roast 1 kg of beans per roast or is there a bit of wiggle room in that?

Second, Is there a significance to the angle of the convection tube?

Thanks in advance, and congratulations on a great looking roaster.
 
jkoll42
bryce_wes wrote:

I am interested in making a "clone" of this roaster. I currently am using a popper but want to move up in the amount of beans that I roast. I am hoping by staying with a hot air machine that I can maintain similar results to what I achieve now. This project jumped out at me because I have almost all the parts on hand. I just have a couple questions.

First, do you just roast 1 kg of beans per roast or is there a bit of wiggle room in that?

Second, Is there a significance to the angle of the convection tube?

Thanks in advance, and congratulations on a great looking roaster.


It would be great to see another roaster using this design as inspiration. Any help I can give just shout out.

1kg just kinda rolled off the tongue easier. I typically roast 2# load since it is easy to order beans in even pounds. With that burner there is more than enough heat for 5# but I think you might run into agitation issues above 3# with the stirrer setup the way it is. I think you would probably be able to throttle the burner back enough to do 1# although I haven't tried. So to answer your question a bit more directly, yes there is wiggle room but I am not sure just how huge a window that is effectively. Probably 1-3# without much modification; maybe more.

The angle of the convection tube was mainly to try and hit the center of the bean mass which was about at the base corner of the pot but the exact angle has proved to not be significant.

One additional update that I will post below. Hope this helps and start a new thread with your build!
-Jon
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3
 
jkoll42
UPDATE::

All has been roasting well. I was having some issues with a little slight unevenness in the roast which I initially though was a agitation issue. Turns out the torch was putting out flame too directly into the beans. I extended the copper pipe to allow for more air mix into the flame before it entered the RC and that solved everything. It's about double the length now and works great.

Also got to test the 'off the grid' ability of the roaster during the Sandy power outage. Ran it off a car jump pack and the propane tank and all was good!
-Jon
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3
 
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