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KKTO - My Humble Turbo Roaster
Koffee Kosmo

Quote

Island Addict wrote:
Thanks for the video! This looks like it will suit my needs in terms of range of batch sizes.

I'd like to use 2 thermocouples -- one for bean temp and one for environmental temp. Any thoughts on the best location for the ET thermocouple?

I'm starting to assemble parts. ThumbsUp


You can place your TC probe on or close to the centreline of the pot
It may be a good idea to get BBQ temp gauge as an alternative

I have received a few questions regarding
The sliding height adjustable brackets and the basket
So I have come up with an alternative arrangement that still does the same job

The brackets can be made as one (1) unit
Picture a basketball ring with 2 backboard brackets. But made with thinner gauge steel or sheet

I have found a suitable insert/bean roast chamber
It is known as a Chinese colander 20 cm dia is a good size
The shape is good with relatively straight sides and coming in at the rounded edge of the suitably flat bottom, and the holes are small enough to contain the beans
You may need to make a wire handle to remove when hot

Here is a drawing

KK
Koffee Kosmo attached the following image:
img_1newbracketdesign.jpg

Edited by Koffee Kosmo on 01/25/2009 10:42 PM
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.
 
Island Addict
Turbo oven and gear motor arrived today. Still waiting on collander and other parts. . . . Just wondering about chaff in the convection fan/heating element. It looks like it might be a good idea to add a stainless steel screen over the fan to keep chaff out, or is that not necessary?

I'm also thinking of boosting the voltage on the fan for greater circulation. Probably not necessary, but I have the parts for it from a previous project so might be worth trying.
Rob
 
seedlings
Awesome!

Island Rob, maybe you could start another thread do document the whole process??

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

Island Addict wrote:
Turbo oven and gear motor arrived today. Still waiting on collander and other parts. . . . Just wondering about chaff in the convection fan/heating element. It looks like it might be a good idea to add a stainless steel screen over the fan to keep chaff out, or is that not necessary?

I'm also thinking of boosting the voltage on the fan for greater circulation. Probably not necessary, but I have the parts for it from a previous project so might be worth trying.


I repeat Chads comment "Ausome"

I have not had a problem with the chaff going into the TO's element but the TO should have a S/S shroud already over the element

While roasting the chaff can be clearly be seen spinning on the bottom of the pot completely separate from the beans 4 inches away and 8 inches away from the TO element.

However if you want to try it with extra fan power I don't see any problems
I would be inclined to set the fan to a variable speed adjustment It will be another way to to vary and control the temperature at any part of the roast.

If you have a chaff related problem as a direct result of the extra fan power you may require a chaff collector
I have a drawing of a chaff collector
(see Picture)

Time the RPM of the motor to a range of 42 rpm to 55 rpm as optimal

If you need images of specific items you only need to ask
Keep me in the loop

I am always here to help ThumbsUp


KK
Koffee Kosmo attached the following image:
img_chaffcatcher1.jpg

Edited by Koffee Kosmo on 02/04/2009 9:31 PM
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.
 
Island Addict
I'm thinking about a chaff collector. Where do you think would be the best place to put it? On the side of the pot? On the bottom?
Rob
 
Koffee Kosmo
Position the fitting to be right on the bottom of the pot or false bottom

KK
Edited by Koffee Kosmo on 02/04/2009 11:06 PM
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.
 
Koffee Kosmo
Here is a drawing Rob
Position of chaff catcher


KK
Koffee Kosmo attached the following image:
img_chaffpos.jpg

Edited by Koffee Kosmo on 02/05/2009 5:32 PM
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.
 
Gella
Hi KK
this is Gella have built the turbo roaster and roasted my first batch of greens tonight brewed up a cup just perfect. The only thing I did different was I lagged and cladded the outer pot to keep the heat in and to make it a little bit safe as to not to burn yourself.Best cup of coffee ever had.

Regards
G
 
Koffee Kosmo
That is terrific and well done Gella :Clap:
Its been a while since your PMs
It looks like you have been busy head down tail up & all the building instructions were sufficient

You are the first to make this roaster design (apart from the original) ThumbsUp
And then there were 2 & hopefully more to follow

Quote

The only thing I did different was I lagged and cladded the outer pot to keep the heat in and to make it a little bit safe as to not to burn yourself.Best cup of coffee ever had.


Good Idea and good adaptation
In Brisbane Australia we are almost in permanent summer so I don't have the heat loss problem but it is a good safety option

Gella when you get a chance please post a photo of the roaster and some roast results

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.
 
Gella
Hi kk
Have got some pictures not sure how to send but have given it a go hope this works.
Regards
G
Edited by Gella on 02/18/2009 3:09 AM
 
Koffee Kosmo
No Gella cant see anything

You need save the images as Jpeg
Reduce them in size to under 90 kb & 640 X 480

Hit the browse button and add

Or add them via a link from e.g. photobucket
In between this [img][/img]

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.
 
Gella

Quote

Koffee Kosmo wrote:
No Gella cant see anything

You need save the images as Jpeg
Reduce them in size to under 90 kb & 640 X 480

Hit the browse button and add

Or add them via a link from e.g. photobucket
In between this [img][/img]

KK
 
Koffee Kosmo
A fine roaster building job by a fellow homeroaster member :Clap:

This is the Turbo Roaster Gella built
He was kind enough to email me the photos

His efforts must be applauded as it truly is a job well done

Gella you will need to report back with some roasting results and your experience with the roaster as a design ??


KK
Koffee Kosmo attached the following image:
img_roasterbygella.jpg

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.
 
Koffee Kosmo
Also a compilation with the roast chamber & agitator attached

Gella has taken this design to another level with a dedicated cabinet and sliding cooling tray

That's what I would have done but my wife wanted it to stored away when not in use


KK
Koffee Kosmo attached the following image:
img_2roasterbygella.jpg

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.
 
Koffee Kosmo
Close up of roast chamber and cooling draw

Nice neat job

KK
Koffee Kosmo attached the following image:
img_3roasterbygella.jpg

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.
 
seedlings
Wow, Gella! Your extremely impressive work reflects not only your skills but KKs great inspiration and instruction.

Simply awesome! Great cooling screen, too.

Gella, does your unit tilt and dump ove to the cooling section, or do you remove the roast chamber by hand?

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
Gella
Hi Chad,thanks for your positive comments also to KK for his great idea.
I have been looking for something like this for some time, you know, keep it simple stupid.To answer your question I remove the roast chamber by hand, as I said keep it simple.By the way my first cup from the first roast was the best I have ever had.

G
 
Island Addict
Gella -- Nice work on the roaster! I'm pursuing a similar approach, mounted on a cart with a pull-out cooling tray. Can I ask what you used for the gasket around the top of the pot?

My roaster is proceeding slowly, limited by constraints of work, other hobbies, and budget. But I did manage to do my first two test roasts yesterday:

150 grams to Vienna in about 10 minutes. Roast went a little faster than I wanted, and 1C and 2C were too close together. Next time I'll put the heat element on a router speed control to slow it down. The important thing is that the beans are very evenly roasted with no scorching, better than I've been able to achieve on my Poppery.

450 grams to City+ in about 15 minutes. I would have liked this one to go a little faster. Putting a gasket around the top of the pot should help a lot. Am also considering adding a small heating element to the bottom of the pot, similiar to what Farmroast has I believe. The important thing here is that the roaster can handle a pound. I was very pleased with the agitation of the beans, and the roast came out very even and nice. Am drinking it this morning and am happy with the results.

So far I'm very impressed with turbo oven roasting. The advantages are clear: 1 pound on 1200 watts; very even roasting; low noise; beans visible during roast.
Edited by Island Addict on 02/22/2009 8:09 AM
Rob
 
Gella
Hi Rob.The gasket I have at present is a tube from an auto shop which is rubber I think,but ideally silicon tube would be better' but this dose the job.
Have to agree about the roasts very pleasing as this is the first I have ever done.

G
 
farmroast
ThumbsUp Congratulation Island and Gella! enjoy your Turbo roasters. High temp. silicone tubing can be bought in small quantities here
http://www.usplas...ct_id=8415
farm
Edited by farmroast on 02/24/2009 9:18 AM
Ed B.
DreamRoast 1kg roaster, Levers, Hand Mills http://coffee-roa...gspot.com/
 
Koffee Kosmo
Last Saturday I demonstrated my home roaster to a whole bunch of people

The Turbo roaster was also in a competition against a 1 kg commercial German built Giesen Coffee Roaster

All were impressed with the home roaster as it proved to all present including the professional roaster who was very impressed with the quality of the roast result

The green beans to be roasted were supplied by one of the people watching the demo (see photo of the roast)

This gentleman was so impressed with the roast results that he is now building my design TO roaster and is close to 3/4 complete


This is the roaster I was competing against
giesencoffeeroasters.eu/assets/galleries/100/w1_043.jpg
Koffee Kosmo attached the following image:
img_rawandkarongia.jpg

Edited by Koffee Kosmo on 03/02/2009 9:13 PM
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.
 
seedlings
Lucky! I've never been in a competition here. Or, wait... maybe I should say there is no competition for me here.

Splendid results worthy of accolades!

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

I have had a busy time helping people to build there own Turbo Oven Roaster from around the globe
With a great deal of positive interest and end results

One question kept being asked
Will you make/produce your Koffee Kosmo Roaster for people that just want to buy one

"Answer"
"Yes the KK Turbo Oven roaster - advanced plans are on the drawing board to be made available in kit form"

However I will need to test the prototype first to see what the comfortable capacity will be

Quotes for pricing are now being finalized with engineering shop
Development costs so far have cost me a few thousand $$
But the finished product will be built to last

More on this and other developments will be posted here

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.
 
Koffee Kosmo


Due to huge development costs
At first I will be making them available as a kit by utilizing off the shelf products and manufacture a docking system to join all its all together

If the roaster is received well by the coffee roasting community, the profits gained from this kit will finance the full design

However the kit will be neat,user friendly and above all functional
Roasting capacity will need to be tested but we are hopeful that it will be around 700 + grams but further sample testing will determine that

Currently
1) Working on a dual docking station for motor and Turbo oven
2) Kit style modular model at first by partly using some off the shelf products
3) Just ordered some sample drive motors with steel/brass gears and attached gearbox that will be manufactured to my specifications
4) Need to sort out an agitator coupling and drive coupling to be more user friendly

Any ideas on agitator coupling and drive shaft design ??

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.
 
seedlings
Why not borrow from the breadmaker? Remove a crecent from the shaft, then have the stirring coupling slide down using gravity to hold it in place.

CHAD
seedlings attached the following image:
13kkshaft.jpg

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