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Air Roaster on youtube
RoasterRob
Just came across this air roaster on Youtube.

"Grant from Green Bean House takes us through a demonstration of his custom designed hand-built air roasting machine."

http://www.youtub...DiJY92kkbk

.... and my original air roaster on Ed's site. circa January 2003

http://www.homero...m/rob.html

hmmm.... amusing

Rob
VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
 
seedlings
Rob, this design looks vaguely familiar. Where have I seen it before? Based on his accent, he might not live too far from you? Same neighborhood?

Consider it flattery... and let's not tell him that with a couple of tweaks he could be roasting 4 kilos.
CHAD
Edited by seedlings on 12/26/2009 7:35 PM
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
RoasterRob
Hi Chad

I am flattered. Not unhappy about him copying the design, but he could at least say as much instead of it being titled "...... his custom designed...."

The layout is near identical to that first roaster. Position of torch and VC motor, diameter of pipes, 2 piece furnace section, RC design, type and size of burner.

Yes he is a local based in Auckland.

I did a bit of googling turns out i have seen this roaster some 5 years ago thru alt.coffee. Also discussed it with Grant's friend/colleague Derek on a.c


http://groups.goo...c2fc75de1b
http://homepages....page4.html



Rob vL
NZ
VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
 
Koffee Kosmo
I am willing to build one

But I can only work with plans
Or a complete build pictorial

Including parts & materials list

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.
 
RoasterRob
Hi Kosmo

What size roaster do you want to build? 650grams or 2kg?

Rob
VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
 
Koffee Kosmo

Quote

RoasterRob wrote:
Hi Kosmo

What size roaster do you want to build? 650grams or 2kg?

Rob


My current roaster will roast 600 to 900 grams (Hybrid Turbo Roaster)

So Rob, I choose a 2 kg roaster mate B)

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.
 
endlesscycles

Quote

Koffee Kosmo wrote:

Quote

RoasterRob wrote:
Hi Kosmo

What size roaster do you want to build? 650grams or 2kg?

Rob


My current roaster will roast 600 to 900 grams (Hybrid Turbo Roaster)

So Rob, I choose a 2 kg roaster mate B)

KK


I've been working with a rob designed 2.5lb roaster for six months, and am about to build a 5lber as I am now up to 35lbs/week! Some trepidation in going much heavier without a mechanically assisted dump.


Point being, this is an excellent design that can be used to MUCH greater potential than is shown in the above video. Insane degree of control of the roast. With digital temp probes and some experience, you can really make a huge difference in the cup.
-Marshall Hance
Asheville, NC
 
bvwelch
I'm very interested, except for the references to torches costing hundreds of dollars. Is there no feasible way around this, that doesn't compromise the overall results? thanks! -bill
 
RoasterRob
Hey Marshall

I lift the 2.3kg RC off the roaster with 1 hand, the other hand lifts a 90deg pipe off the RC. My 8" RC will blow the beans out.
If you are doing 35 lbs a week why not look to do a roaster that will do more than 5lb otherwise within the year you will want or need to do it anyway.

Agree very controllable roast with this setup. At some stage in the near future I will be looking to get the datalogging unit from the coffeesnob website, which should improve the control significantly.

Hey Bill

Not sure. For gas gear you need the burner, a valve and an adjustable pressure reducing valve. You may be able to buy an old kit 2nd hand or
find a suitable new one somewhere. The price for pipe and and other parts is whatever you can get it for and how you go about it. ie V8 tin or stainless pipe.

Rob
VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
 
endlesscycles

Quote

RoasterRob wrote:
Hey Marshall

I lift the 2.3kg RC off the roaster with 1 hand, the other hand lifts a 90deg pipe off the RC. My 8" RC will blow the beans out.
If you are doing 35 lbs a week why not look to do a roaster that will do more than 5lb otherwise within the year you will want or need to do it anyway....
Rob


One reason to keep a smaller batch size is to blend beans that were roasted to not quite the right profile. I find large differences in the cup with a 30sec variance spent passing through the 300F's. Perhaps the coffeesnobs datalogger will make it easier to keep the deltaF on track, and my desire to keep roasts consistent will be easier to satisfy. Fact is, I don't want to roast 8hrs a day, that's not why I got into this. Larger and more consistent batches are definitely the goal.

Ah ha! Blow the beans out! Do you think every last little guy will exit that way? A fixed roast chamber has the potential to be more air and therefore fuel efficient. Vacuuming the remainders between batches isn't that big a deal with the convenience of blowing them out.
-Marshall Hance
Asheville, NC
 
bvwelch

Quote

RoasterRob wrote:
For gas gear you need the burner, a valve and an adjustable pressure reducing valve.
Rob


Rob,

One thing I just realized, I've been confusing the name for the fluid-bed roasters (Sivetz) with the name of the burner manufacture (Sievert). Ooops.

What I was wondering was-- is the particular design of the Sievert 2941 burner crucial to the overall success of your designs? I think you're referring to this device:
http://www.siever...tring=2941

I might be able to find the rest of the equipment, maybe 2nd hand, but I need to know how to fit that nozzle to the 2nd hand equipment, right? I'll keep digging for info on threads, fittings, etc. If you can't already tell, I don't know anything about torches. I'll get a buddy of mine to advise me and hopefully keep me from making any stupid or dangerous mistakes.

I do see this brand of torch listed with roofing supply companies -- melting tar I guess? But I haven't seen that specific nozzle yet.

Thanks, -bill
Edited by bvwelch on 12/28/2009 7:56 PM
 
RoasterRob

Quote

bvwelch wrote:

Rob,

One thing I just realized, I've been confusing the name for the fluid-bed roasters (Sivetz) with the name of the burner manufacture (Sievert). Ooops.

What I was wondering was-- is the particular design of the Sievert 2941 burner crucial to the overall success of your designs? I think you're referring to this device:
http://www.siever...tring=2941

I might be able to find the rest of the equipment, maybe 2nd hand, but I need to know how to fit that nozzle to the 2nd hand equipment, right? I'll keep digging for info on threads, fittings, etc. If you can't already tell, I don't know anything about torches. I'll get a buddy of mine to advise me and hopefully keep me from making any stupid or dangerous mistakes.

I do see this brand of torch listed with roofing supply companies -- melting tar I guess? But I haven't seen that specific nozzle yet.

Thanks, -bill


Yes and no, the 2941 is in the right heat range. At 7.7kw at low settings it will do for 650grams. I have also managed to do 4kg with the same burner. I think that is near the upper limit. If you can find a kit with a burner that will operate at pressures between 1bar and 5bar and is around 4 to 8kw it should work. Depends on how big a roaster you want mind you.

Rob
VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
 
Koffee Kosmo
I am even willing to build a 5 kg model

I assume the bottom tube of the roaster stays the same
and the changes required for a 5 kg load are
1) the gas torch is larger for extra heat
2) the top section changes to allow for a larger load

I am working on a couple of enhancements already ThumbsUp

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.
 
StarryNightDave
OK, but how about this one? Has anyone found out how to get one of these?

http://www.youtub...XyjDUagXlw
 
RoasterRob

Quote

Koffee Kosmo wrote:
I am even willing to build a 5 kg model

I assume the bottom tube of the roaster stays the same
and the changes required for a 5 kg load are
1) the gas torch is larger for extra heat
2) the top section changes to allow for a larger load

I am working on a couple of enhancements already ThumbsUp

KK


The air flow for a 5 kg requires 2 VC motors. The 6" furnace section means the air flow from 2 VCs have too great a velocity and will snuff the burner aks me how I know.
You would need to go to an 8" or 10" furnace section. This way if you roast less with a smaller RC you can use only one VC and block off the other. I am having fun trying to shroud the burner inside a 6" furnace while blowing 2 VCs thru it.
The 10" furnace section may be best. The VCs I use are more than 4" dia so will not fit at the bottom an 8" pipe.

more soon

Rob
VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
 
Koffee Kosmo

Quote

Roaster Rob wrote:
The air flow for a 5 kg requires 2 VC motors. The 6" furnace section means the air flow from 2 VCs have too great a velocity and will snuff the burner aks me how I know.
You would need to go to an 8" or 10" furnace section. This way if you roast less with a smaller RC you can use only one VC and block off the other. I am having fun trying to shroud the burner inside a 6" furnace while blowing 2 VCs thru it.
The 10" furnace section may be best. The VCs I use are more than 4" dia so will not fit at the bottom an 8" pipe.

more soon

Rob


Thanks Rob
I cant wait for the plans

I have access to VC motors 5.5 inch (140mm) DIA as ones used on commercial back pack VCs
Also can get larger ones that are commonly used on carpet cleaning machines these ones also join together with a connecting pipe
I have contacts in the industry including used equipment and can get anything you specify

I do however want to keep motor noise down
What do you think of SPA / hot tub blower motors ?

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.
 
RoasterRob

Quote

Koffee Kosmo wrote:

Thanks Rob
I cant wait for the plans

I have access to VC motors 5.5 inch (140mm) DIA as ones used on commercial back pack VCs
Also can get larger ones that are commonly used on carpet cleaning machines these ones also join together with a connecting pipe
I have contacts in the industry including used equipment and can get anything you specify

I do however want to keep motor noise down
What do you think of SPA / hot tub blower motors ?

KK


Keeping noise down could be a problem. Any blower or blowers that supply enough pressure and volume will be noisy. I don't know anything about SPA / hot tub blower motors. A more suitable blower motor would no doubt be a lot more expensive than VC units and probably quieter, though I don't know much.
I found the cheap 1000watt VC supplied just as much air flow and as much pressure as a 1600 watt unit I bought. I am told that the tellus units are largerin diameter (approx 170mm) so assuming they run at the same revs as the smaller units should supply more volume at greater pressure.
For a 5kg roaster 2 basic 1000watt units should do it.

more later

Rob
Edited by RoasterRob on 01/01/2010 4:24 AM
VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
 
seedlings
The only way to stop sound transfer is mass. If you want it quiet, put the motor in a heavy box... hey, it's a vacuum cleaner motor - it's designed to operate in a little hot box.

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
Koffee Kosmo
Something like a dust extractor motor will work for both the cooler and the blower

KK
Koffee Kosmo attached the following image:
fan_motor.jpg

Edited by Koffee Kosmo on 01/01/2010 5:37 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.
 
RoasterRob
No it won't. I use a dust extractor unit to cool my beans. I did test it for blowing them. This type of blower has about 1" water gauge pressure. They have lots of volume just no pressure. A VC has about 18" plus.

check out

http://forum.home...#post_2999


When boosted with a variac it was able to move thru a 3 or 4" thick layer of beans only. Not worth the effort.

Now to finish my coffee and get back to packing.

cheers

Rob
Edited by RoasterRob on 01/01/2010 7:35 PM
VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
 
mainestratman
What's the consensus on the effectiveness of an air mattress blower/inflation thingy? Granted, they are plastic, but they have to push some PSIs, maybe?

 
seedlings
It WILL work! Just don't know what amount of beans it will move. Plastic really isn't an issue with cool air intake and cool air output just as long as the heat source is far enough downstream.

Pressure is what you want. Pressure. Not CFM or MPH.

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
RoasterRob
I saw the spec sheet for one of these at a supplier of fans and blowers etc. They are still in the 2 to 3 inches water gauge range.
Realistic pressure needed is 10" minimum preferably more JMO.

Rob
VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
 
Hamilton
That's a bit of a shame, Rob. You've been very generous with your design and experience. Seems like a little credit where it's due would be courteous at the least.

Speaking of which, I just got the mock up of my 0.5 lb sample roaster based on your design to spout some beans. It's definitely rough looking, but it worked. So thanks for all the info. This is the first real sign of progress I've made so far

Now for the question, how are you controlling air flow on your roaster? My 1000w vacuum motor managed to spout beans everywhere but I haven't figured anything for air control since I'll be doing such small batches, at least for the time being.
Edited by Hamilton on 01/03/2010 6:25 PM
 
Koffee Kosmo

Quote

Now for the question, how are you controlling air flow on your roaster? My 1000w vacuum motor managed to spout beans everywhere but I haven't figured anything for air control since I'll be doing such small batches, at least for the time being.


I would suggest that the easiest way to control the speed & air strength of the motor to suit the weight of the beans is to fit a quality power supply dimmer switch/dial

And adjust as required

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.
 
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