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06/04/2023 7:48 PM
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Halogen Radiant Roaster
Electrical wiring is protected by an aluminium cover strip which clips snugly over the main aluminium support beam
Brainiac attached the following image:
There was a question earlier about buildup on the lamps. I can confirm that not only is there no buildup on the lamps, there is none on the reflectors or the mounting bracket either. Obviously the temperature here is too high for deposits..:@
Brainiac attached the following image:
The lamp dimmer controls from 0 to 100% power (this is lamp test at dim - can't look at the lamps at full noise!)B)
Brainiac attached the following image:
The end of the reflector shield is about a half-inch from the back of the drum. This view also shows the offset of the lamps, which covers the position of the bean mass as the drum rotates CW.
Brainiac attached the following image:
A view of the heater assembly mounted, with drum removed
Brainiac attached the following image:
Rear view with cover removed
Brainiac attached the following image:
Partial side view with cover removed
Brainiac attached the following image:
Took it apart some, put it back together, still works like a charm! Grin(phew!)

BTW, the reason I hung the drum from a top beam, rather than a bottom mounting, is so that I could slide a tray under the drum for dumping (obviously!)

Any questions?
Brainiac attached the following image:
what great photo's
what agreat roaster
thank you
this I will try to build

the bean

aka katee
I thought that I had better get around to posting a picture of my working setup including the bean cooler (alas, too small for the competition!)
This uses a 4-inch bathroom extractor fan, and includes a chaff filter and bagging chute (and makes a nice stable base for the roaster).

I like the fact that I can cool the previous batch and roast the next batch at the same time, all self-contained.

Brainiac attached the following image:
Terrific engineering and sheet metal work!!!s:2s:1s:2s:1s:2s:1

No air flow hassle, less cleaning.
This needs to go directly into production. When can I buy one?
11 years old... forever!
>home-built roasters and fair trade
John Despres
Wow, It just gets better and better! Very cool, Brian. s:1

This roaster inspired me to try building one of my own, but it's not nearly as nice as this one. Mine's a bit more of a junk-yard dog. Sorta looks like a home made tow truck on the back of a a '73 F100 pick up...

I'll post all about it once I get a little more time.
Respect the bean.
John Despres
Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
Nice unit and prototype. How quickly does the 4" bath fan cool one pound? I also roast 1 pound and spread the beans over a 20" fan for a one minute cool. Dan
Brian, I still feel guilty every time I look at your roaster.

Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
Kaffee Bitte
Fit and finish! Dang! Your roaster makes me want to grunt!

"Some days it's spice, other days it's bitter dirt."
WOW and way, way cool...

absolutely wonderful, huge want one drool factor.

Hey dbanbit, love your url name, great!!


I know, it's old, but instead opening a new thread for a question spot on topic, I hope someone still read here,so...

Where would be the most appropriate place for ET probe in such roaster ?
Check the OP's profile. There should be a email address you can try. He was last on this forum in 2017.

KKTO Roaster.
It looks like an awesome roaster. Have you considered using a thin perforated stainless drum? you can source these as perforated stainless waste baskets at Various retail stores. Awesome design.
Ed Needham
"to absurdity and beyond!"
Opinions from anyone than the OP are welcomed, though.
I am thinking the place for ET should be not exposed to direct radiant heat, so behind the reflector... now wondering how much heat radiates the reflector itself !
I have used a perforated stainless drum with propane for about 16 years with good results. I do use perforated ceramic blocks between the flame and the beans, which creates a barrier, but also transfers heat as an infrared radiator as the ceramic blocks heat to bright red at times. I am a big fan of the perforated stainless, number one because you can turn the temperature on a dime, and number two it releases all of the chaff and smoke as it roasts.
Ed Needham
"to absurdity and beyond!"
And your ET probe is placed... where ?
I measure the ambient temperature of the roaster at Bean level. I have used a long stem dial thermometer at times two measure temperature in the bean Mass, but it does not help me that much as long as I control the roaster temperature. All temperature readings are essentially approximation that you can learn to depend on at various points. No one has come up with a functional way to measure internal bean temperature while roasting, although we toy with the idea I'm a small Bean size capsule with a temperature sending unit, but could not find one that would tolerate the Heat.
Ed Needham
"to absurdity and beyond!"
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