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Here's Mine
norvegicus
Here's my BBQ Grill roaster.

http://vimeo.com/...


The 8" x 18" drum is made from 20G perforated stainless: http://www.amazon...B003DKJQDQ and the ends are cake pans: http://www.amazon...B003YKGRJG. I made stirring vanes out of the same material. It's all held together with 1/8" stainless rivets.

It's built on 1/2" stainless threaded rod and the bearings are graphite impregnated bronze bushings and thrust washers held in place by stainless nuts with lock washers with no pressure on the bronze parts. The bushings turn on the threaded rod but do not turn on the aluminum body of the grill.

The grill: http://www.amazon...B004EBUTWA I'm using the factory heat diffuser so far but I might build a more solid one.

The motor: http://www.surplu...e=electric I mounted the motor using scrap metal from my garage stash.

The scary bean cooler is just a cut up leaf blower in a bucket. It cools several pounds of hot beans in about two minutes.

So far I've only roasted one batch, two pounds of Costa Rica beans. They came out perfect, I stopped as soon as second crack was fully established, at about 9 minutes. I'd call it a Full City roast.

I need a better thermometer, a heat shield for the motor, and probably some internal shrouding to improve fuel efficiency and temperature control.
Edited by norvegicus on 03/18/2012 8:31 PM
 
Koffee Kosmo
Very nice set up - I just saw your video
Have you roasted anything yet?

KK
I home roast and I like it. Designer of the KKTO
Roaster Build information
https://forum.hom...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.
 
norvegicus
Just the first batch that I already mentioned. That's a good week of coffee for me. I'm going to get a better thermometer and build a heat shield for the motor before I roast again...
 
seedlings
Great roaster! What size batch do you usually roast?

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
norvegicus
So far I've only down two pounds at a time. Pretty sure I could do five no problem. Three batches down, no problems, roasting was very straightforward and easy to control. I'm really delighted with this thing.
 
allenb
Sounds like you're on the way! Please post times to 1C and from 1C to finish and how the roasts are cupping.

Do you have good control with the burner valve arrangement?

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
norvegicus
My last batch: 2 lbs Kenya AA 1C started at 8:00, lasted until 9:30 2C started at 10:15 and i pulled the drum about ten seconds later. I left the burners on full blast this time, just to see what would happen. I think it was too fast, I'll back off next time. That was last night, haven't cupped it yet.

I still haven't installed a really useful thermometer so I'm not sure what to say about burner control. I do seem to be able to slow things down pretty well by turning the burners down and/or opening the lid, but I don't have a good feel for what's happening without a good thermometer.

I haven't burned or ruined any coffee yet, so I'm pretty happy. So far I've just been playing around to get a feel for it. I think I'm ready to start being more methodical now...
 
ginny
Looks great, good work.

-g
 
allenb

Quote

norvegicus wrote:

My last batch: 2 lbs Kenya AA 1C started at 8:00, lasted until 9:30 2C started at 10:15 and i pulled the drum about ten seconds later. I left the burners on full blast this time, just to see what would happen. I think it was too fast, I'll back off next time. That was last night, haven't cupped it yet.

I still haven't installed a really useful thermometer so I'm not sure what to say about burner control. I do seem to be able to slow things down pretty well by turning the burners down and/or opening the lid, but I don't have a good feel for what's happening without a good thermometer.

I haven't burned or ruined any coffee yet, so I'm pretty happy. So far I've just been playing around to get a feel for it. I think I'm ready to start being more methodical now...


To gain tight control of your burners you might consider adding a user adjustable regulator [with control knob] and a pressure gauge. Mount the regulator in a convenient spot so you can make minute changes without having to stoop down.

Valves that come with grills are almost useless in that they are inherently nonlinear.

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
norvegicus

Quote

whizie wrote:

Sweet roaster! Thanks for posting. Where did you get the bushings?


McMaster Carr

They are the graphite SAE 841 version, rated to 700??F:

http://www.mcmast...gs/=h0dg2i


And I used thrust washers on each side of each bushing:

http://www.mcmast...rs/=h0dgy4


So far everything is holding up well and I'm happy with all my parts and material choices.

I just got a new thermometer, some 1/8" aluminum sheet to use as a heat shield for the motor, and a cooling fan for the motor, all from McMaster Carr.
 
norvegicus

Quote

allenb wrote:

To gain tight control of your burners you might consider adding a user adjustable regulator [with control knob] and a pressure gauge. Mount the regulator in a convenient spot so you can make minute changes without having to stoop down.

Valves that come with grills are almost useless in that they are inherently nonlinear.

Allen


That makes a lot of sense, thanks.

My homebrew burner has a regulator and I've noticed that it is much easier to adjust than this grill is.
 
wsikes
Very nice roaster! I am hoping to build one in the next month or so and am wondering if the drum vanes are really necessary with such high rpm's?
William Sikes
 
Unta
NOT an appropriate regulator for BBQ grills, my appologize for a bad suggestion. Thanks to allen for the remedyive used these folks 30psi regulator successfully for the last year on my roaster for refined adjustments.

http://www.tejass...e_Assembly]

Nice build.
Sean
Edited by Unta on 04/16/2012 7:37 PM
Sean Harrington
educate.
 
norvegicus
Excellent, thanks Sean!

- Sean :)
 
norvegicus
I got the new thermometer installed today, the 5" dial is huge and it's precise to about 5??F. With the crappy valve on the grill I can set temperature fairly well but the dial settings are not really repeatable. I'll be ordering the regulator Unta linked in a few minutes, that's the best price I've seen for that combo of stuff.

i1112.photobucket.com/albums/k497/norvegicus/2012-04-15_17-33-17_508.jpg

Got the thermometer at McMaster Carr: http://www.mcmast...88/=h4fw4c It's a 2.5" stem, 5" dial, 50-550F

I plan to get the same thermometer for my BBQ smoker but in a different temp range.


I decided not to bother with the heat shield, the cooling fan I installed on the motor keeps it nice and cool.
Edited by norvegicus on 04/15/2012 9:05 PM
 
norvegicus

Quote

wsikes wrote:

Very nice roaster! I am hoping to build one in the next month or so and am wondering if the drum vanes are really necessary with such high rpm's?


I have no direct experience with roasting with no vanes but I've read at least a few reports from others that started with no vanes and got uneven roasts at this same rpm range. It might depend on how even your heat source is from side to side.

My vanes work really well, better than expected. I copied the vane design from the Behmor 1600. There are six vanes, two V shaped ones in the center that hit the beans with the vertex of the V and push them outward, and two vanes on each end that push the beans back in toward the middle.

My beans get mixed up a LOT and my roasts are perfectly even and there is no chaff left on them when I'm done.
 
allenb

Quote

Unta wrote:

ive used these folks 30psi regulator successfully for the last year on my roaster for refined adjustments.

http://www.tejass...e_Assembly]

Nice build.
Sean


Sean,

I've been pulling what's left of my hair out for a while now searching for an adjustable propane regulator that does low pressure (0-11 inches WC) which is what most BBQ grills take. The only adjustable ones I've found so far are high pressure 1-30 psi, 1-60 psi etc... With these reg's, a 1/8th turn of the adjustment knob would go from off to full output.

The only other option I've found is to go with a table top grill 1lb bottle regulator which comes in an adjustable model but is limited to around 15,000 btu/hr. You can buy adapters to go from 20 lb P.O.L drum fittings to the 1"x 20 1lb drum fitting to allow hooking the regulator to your 20 lbr.

I don't know if 15,000 btu's will be enough for a bbq grill roaster.

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
John Despres
Try stopping by your local welding shop. Tell them exactly what you're doing and you'll most likely have their ear for as long as you need it.

These guys are usually just geeky enough to dig what we do here.

Have fun!

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.
 
Unta
Allen,
I'll take a video of mine in action. I have one full revolution that I operate in. In this application, it is not a torch, its a bbq grill. Doesnt that dramatically effect the end result(the function of the regulator)?
My burner wants 6PSIG i give it anywhere from 3-6 during the roast. That gives me control to which i can stop the progression of the roast or get it so that it climbs x/min. It works :).
Sean
Edited by Unta on 04/16/2012 7:15 PM
Sean Harrington
educate.
 
JETROASTER
Nice deal on the regulator. Check out the same site...order the control valve.
Use the regulator to control delivery pressure, use the valve to control flow.
I'm not an advocate of using regulators as valves.
A control valve provides complete and immediate shut-off...at the roaster.

Beyond that..I like Johns tip. The welding dorks will love your project, and give you loads of free advice.

Have Fun...be safe. -Scott
 
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