Koffee Kosmo Roaster with Heat Gun as Alternative Heat Source

Koffee_Kosmo

This thread topic has been posted to record alternative sources of heat for the Koffee Kosmo roaster design

For some time now I have had correspondence with details of DIY modifications by owners and requests to build a special KKTO roaster for the not so DIY type 😉

So I thought that a pictorial is in order for Crema members to see some handy work

The following KKTO roaster was built with pots supplied by the current owner
I had to redesign the agitator blade to overcome a very flexible base on the perforated pot

A traditional set up using a stand for the Heat gun
[attach=1]

[attach=2]

Early stage of roast
[attach=3]

Advanced stage of roast
[attach=4]

Cooling roasted beans
[attach=5]

New Agitator wire type ( butterfly)
[attach=6]

Test trials video of the new agitator
http://www.youtube.com/watch?v=wTFjn3SA3eM

Koffee_Kosmo

The second KKTO roaster on the list is owned by Crema member - bcspark Had a trial session with Barry kindly bringing his roaster for appraisal He originally did some modifications to the TO but eventually the element failed Barry on another modification removed the electric section of the Turbo Oven and sealed it with a metal plate On this plate he made a hole for the Heat gun access The heat gun he uses is a commercial type with digital heat adjustment to 650 deg Celsius called Stienel (see photos) The day of the trial we did 1 kilo of a Colombian Bachue and it went without a hitch Photos Heat Gun - Stienel HG 2310 LCD Electronic [attach=1] [attach=2] Roaster with TO glass section and heat gun in place [attach=3] Roasted beans cooling [attach=4] [attach=5] The agitator and the thermocouple [attach=6] KK

UNM

how do you get the beans out to cool? Or do they cool in the roaster? Looks like a separate cooling tray, but all that hardware over the pot would make it tricky to tip the beans out quickly wouldn't it?

Koffee_Kosmo

UNM wrote:

how do you get the beans out to cool? Or do they cool in the roaster? Looks like a separate cooling tray, but all that hardware over the pot would make it tricky to tip the beans out quickly wouldn't it?

See post 2 The KKTO roasters utilize a separate bean cooler The upper pot insert is raised and the beans poured into the cooler KK

Rider

If you are going to use a heatgun it would seem to me the KKTO is overkill. I would envisage the benefits of a KKTO is being a sealed unit... i.e. an oven or chamber. Using a heatgun you be be way more financially ahead by buying an el cheapo bread machine from K Mart for 30 clams... Thoughts?

Koffee_Kosmo

Rider wrote:

If you are going to use a heatgun it would seem to me the KKTO is overkill. I would envisage the benefits of a KKTO is being a sealed unit... i.e. an oven or chamber. Using a heatgun you be be way more financially ahead by buying an el cheapo bread machine from K Mart for 30 clams... Thoughts?

The second unit ( see post 2 ) I posted actualy uses the original concept of a sealed unit but the heat source has been replaced KK

Rider

Koffee Kosmo wrote:

The second unit ( see post 2 ) I posted actualy uses the original concept of a sealed unit but the heat source has been replaced KK

Indeed. My apologies. That makes more sense rather than open air heat gun. Rider

UNM

The second post appeared while I was composing my previous post, or perhaps I just missed it. That is a better setup as I can see it would be possible to get the beans out fairly quickly. Also no chaff blowing around

Koffee_Kosmo

UNM wrote:

The second post appeared while I was composing my previous post, or perhaps I just missed it. That is a better setup as I can see it would be possible to get the beans out fairly quickly. Also no chaff blowing around

Correct And this feature - choosing a heat source - will be part of the new roaster design I have to email some people to see if I can get the electronics part altered to be programmed to cater to set and user imputed profiles via the readings of a thermocouple in the bean mass KK

bcspark

UNM wrote:

and for those more concerned with external appearances Thanks Paul for posting my setup.Still roasting 500-1000grms with the same results. Bcspark I think for $1250 we did ok. one month on no issues yet.

bcspark

I have finally made a new top for my KKTO. As shown in previous post I have chosen a heat gun as heat source. The Steinel gun is programmible in both heat and air supply giving heat from 50deg to 650deg in small increments. Air supply is variable and separate from heat control. The new head module is made from 3mm marine grade SS ,hard as, and complete unit is SS. Below are some photos of the finished article . With all variables plus CS monitoring equipment I can roast to any profile 500grm to 1kg of green beans. The Steinel is an industrial unit designed to work continually at full program. [attach=4]

Brett_H

Lovely work mate!

Koffee_Kosmo

bcspark wrote:

I have finally made a new top for my KKTO. As shown in previous post I have chosen a heat gun as heat source. The Steinel gun is programmible in both heat and air supply giving heat from 50deg to 650deg in small increments. Air supply is variable and separate from heat control. The new head module is made from 3mm marine grade SS ,hard as, and complete unit is SS. Below are some photos of the finished article . With all variables plus CS monitoring equipment I can roast to any profile 500grm to 1kg of green beans. The Steinel is an industrial unit designed to work continually at full program.

Very nice with an industrial feel Barry :thumb: just the way I like it We may have spoken about this adaptation when I had the pleasure to road test your KKTO roaster at Barazi One of those design aspects we talked about may be part part of the new KKTO design ? We need to get together again for another roast session KK

bcspark

As suggested KK and I. Met at Chrises,Bezzera home.This was to roast Chris some of his beans for his use .name of bean escapes me as I was unwell . Paul and I roasted 1 kg in my KKTO with the Steinel HG source .My learning curve was refined by roasting with Paul. Perhaps Paul can fill in the details as he was active with the camera. Paul thank you again for for passing on your experience it was well noted. bcspark

Koffee_Kosmo

I was with Barry to test the new modified roaster using a heatgun as the heat source Works a treat Thanks Barry for allowing me to test and observe it was a success [attach=1] [attach=2] Also made a short video http://youtu.be/gnLpFjI-ftE KK

bcspark

Thanks KK sick and all that I was I would not have missed our session for anything. Learnt so much bcspark

bcspark

Still fiddling . Decided to take my heat source closer to bean mass as you have stated ,ideally 50 mm above mass. Have added a 50mm SS tube to under side ,approx. 80mm long .Still experimenting as I have only done 2 roasts but both showed better results. I will post some photos when tests are complete bcspark

bcspark

Still not satisfied . Heat source is to one side so difficult to get hot air to 50mm of beans. looking at new top to centre HG. Having said this I have used a new profile to roast with an extended drying time ie from TP to 100deg at least 3-4 mins . Seems to be working as my Buf Remera roast became a smoke screen during rolling 1stC at 216deg :thumb:

Koffee_Kosmo

You can fit a DIY diffuser nozzle under the plate to scatter the heat direction A lot easier than a new plate KK

bcspark

In the process of design of same .Will have to go to mates workshop to cut and weld 50mm SS hollow round. Just considering which will be better outcome for air supply