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Drum Roaster Project
zena13
I thought that I would share with you my drum roaster project that I have been working on. I do not have a welder so it has been fabricated utilizing ? inch plate bolted to an angle iron frame. I do have a welder available to me at work so when it is completed I will likely at least weld some of the key areas. I have a removable cover plate on the front of the roaster so I will be able to remove the drum assy. for cleaning. I will be adding a tryer, loading funnell and bean discharge to the front of the roaster. The drum is made from a recycled aluminum carbon dioxide cylinder. I am a little concerned that the heavy wall thickness will take a long time to heat up the inside of the drum but will give it a try. It measures 7? ID and is about 20? long so it should roast 5lbs plus. I haven?t decided on a heat source yet. I would like to go with propane but I would like for it to be PID controlled so I assume that electric would be the easiest means. Any ideas?
Edited by zena13 on 03/15/2009 10:12 PM
 
zena13
Added Picture

Sorry, I can't get a picture to upload !!
Edited by zena13 on 03/16/2009 10:06 PM
 
Koffee Kosmo

Quote

I haven?t decided on a heat source yet. I would like to go with propane but I would like for it to be PID controlled so I assume that electric would be the easiest means. Any ideas?


Propane is your best and most economical choice
Use a ribbon burner for best results

Some photos would also be nice

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.
 
seedlings

Quote

zena13 wrote:
Added Picture

Sorry, I can't get a picture to upload !!


The picture has to be resized to less than 97.66Kb. Usually if you can get the largest dimension less than 500 pixels, it's good to go. Can't wait to see pictures!

If you have further trouble, send me a PM.

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
seedlings
Roaster
seedlings attached the following image:
roaster_1_1.jpg

Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
seedlings
Drum
seedlings attached the following image:
drum_1.jpg

Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
seedlings
Drum again.
seedlings attached the following image:
drum_2.jpg

Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
qajariaq
Very impressive! :BowDown:

The CO2 cylinder looks like a great drum - did you true up the front edge on a lathe?

Is the drum shaft support near the open end an off-the-shelf component or custom made? I would like to find something similar...

Considering the thickness of the drum, I think propane is your best bet (unless you have a high-current 220V circuit that you can utilize while roasting).
 
zena13
I have not faced the end of the drum yet but I do plan to do so. The end support hub is simply fabricated from a turned piece of aluminum with a reamed hole through the center. 5/15 bolts are then inserted through the outside of the drum and threaded into the hub. Pretty simple but it works. Still working on a heat source. I have no idea how many burners or btu I will need.I am considering starting with a single high pressure burner like is used in the outdoor fryers. They claim they produce up to 180,000 btu. It may take alot of experimentation.

Mike
 
Koffee Kosmo
Looks like you are building it similar to a commercial roaster

May I ask if you intend placing vanes to turn, mix & push the beans out when the roast is done

While it in the planing stage
It is also important to be able to
1) add air to control heat/cool as required
2) variable drum speed
3) insulate for safety & to prevent heat loss

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.
 
seedlings
Awesome work, Mike! What kind of mechanism are you thinking for load/unloading beans? Will the whole drum come out to pour the beans in, or will the drum be a permanent mount?

Oh, and I like how you said the support is "simply" fabricated from the turned aluminum... maybe simple for you!
ThumbsUp
CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
zena13
I am planning on adding vanes and a door in the front of the roaster to eject the beans. Seems like I read somewhere that the the vanes in commercial roasters were arranged to push the beans toward the front when the drum was operated in reverse. Anyone know if this is correct ? Otherwise the beans would be pushed against the front during the roast. I would think that it would result in an uneaven roast. I do plan to insulate it with something like koawool. I am not sure about how to design appropriate ventilation and air flow inside the roaster. I could use some help on that if anyone has any ideas.

Mike
 
Koffee Kosmo
Here is a little help from me
Commercial drum picture

KK
Koffee Kosmo attached the following image:
img_diedrichdrumroasteragitatorvanes.jpg

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.
 
cup_in_hand
In a commercial roaster the drum does not reverse direction. The vanes are designed to move the coffee within the drum. Generally the vanes along the wall move the coffee toward the front of the drum, and there is a second set of vanes either around the shaft or directly on top of the first set of vanes that move in the opposite direction. If you looked down from the inside of the drum they would make an x shape.

When the door is closed the beans move to the front of the drum and when they hit the face plate they push upward where the second vanes pull them backward . This facilitates both even mixing and even heating of the beans.

There's a great animation Here that shows the movement. click on roasters at the bottom of the page, click solid drum, and when the diagram comes up turn the "features" button to off. then you can click Bean or airflow etc. and it will show you the movement in the drum. It sounds much more confusing than it is.:trink25:
Edited by cup_in_hand on 03/18/2009 8:07 PM
Anton
A life without coffee is a life not worth living.
 
seedlings
The vanes I've seen - including the picture KK posted above - get the beans going in a circular pattern. The outer (lower) set of vanes push toward the front of the roaster ant the inner vanes push the top layer of coffee toward the back of the roaster.

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
John Despres
Here's a video of a solid drum roaster where you can see the vanes pushing the beans out. It's a cute roaster, too, but small with a maximum of 600gr. http://www.discaf...os-tn1.htm

It looks to be an electric machine, to me.

It's from a French company http://www.discaf...ra-tn2.htm

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.
 
zena13
That is a Sweet little roaster. I like the way the door hinges open. Looking at the picture that KK posted the outer vanes look pretty easy but the inner ones look a little more difficult to fabricate and attach. It may take some experimentation to get it right.

Thanks for all the advice.

Mike
 
homeroaster
I wonder if the stirring vanes can't be attached to the central axis, with the central axis affixed to the drum, instead of trying to weld/bolt a bunch of vanes inside the small drum.
*********************
Ed Needham
"to absurdity and beyond!"
http://www.homero...
http://www.facebo...EdNeedham1
*********************
 
MarkBart
That's the way I'd try it Ed. Make it like an electric motor with one set of vanes like the stator and one set on the central rod like a rotor.
I'm so Bad, I'm Good! www.homeroasters.org/php/images/smiley/cool.gif
I'm putting the small back into Small Business!
 
seedlings
Ed, Mark, so then, would the "drum" remain fixed, and only the vanes rotate, like a corkscrew?

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
Koffee Kosmo

Quote

seedlings wrote:
Ed, Mark, so then, would the "drum" remain fixed, and only the vanes rotate, like a corkscrew?

CHAD


For a horizontal drum design
The welded stirring vane static method is better in my opinion
Reason
Small tolerances are required as gaps between two or more moving surfaces (as beans can get wedged while roasting causing seizure)

Heat expansion & contraction need to be calculated

Also rotation has to always run on true centre small deviations can cause problems

That's my 2 quarters worth

KK
Edited by Koffee Kosmo on 03/25/2009 7:10 PM
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.
 
korucoffee
Hey KK,
I am mid design for a new bbq roaster and need some help with the vanes.
It will be a standard (with a few mods) horizontal drum about 24" x 8/9" diameter.
I've got most of it mapped out and am testing some different approaches re the vanes but not coming up with much. My head hurts.

Ideally I want the beans to be agitated from right to left and back, in a circular motion, moving from one side to the other.

Can you offer any advice?
Thanks,
Paul
 
Koffee Kosmo
This is an easy design that is just like the larger commercial roasters

Works on solid or perforated drums and should be easy to replicate B)

This is the only photo I have

KK
Koffee Kosmo attached the following image:
img_roast_drum_inner.jpg

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.
 
korucoffee
Awesome,

Thanks for that. That's given me something good to work with.
Cheers,
Paul
 
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