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Halogen Radiant Roaster
Brainiac
Inside of drum. The main agitating vane is curved to speed up dumping of beans. I don?t know if more vanes would make any difference to the evenness of the roast? at present the motion of the bean mass under the radiant heat source is slide-and-tumble rather than continuous tumble, and I believe that provides the optimum heat transfer.
Brainiac attached the following image:
P1000735[442].jpg
Brainiac
The hole for the loading chute was cut in the door using a sheet metal nibbler. the chute itself is a circle of scrap stainless steel and is held in place with bent tabs.
Brainiac attached the following image:
chute[443].jpg
Brainiac
The door mounting allows accurate alignment of the door to the drum (the original plan was to use this mechanism to open the door for dumping the beans, but the top-mounted hinge and lock knob proved easier to use)
Brainiac attached the following image:
P1000722[444].jpg
Brainiac
Most of the weight of the drum (and beans) rides on a small ball bearing, shown here, mounted on the top of the door
Brainiac attached the following image:
bearing[445].jpg
Brainiac
Bearing viewed from inside....
Brainiac attached the following image:
P1000719[446].jpg
Brainiac
The lamp holders are mounted on a bracket hand-fabricated from aluminium angle, fixed to the inside of the door
Brainiac attached the following image:
P1000725[447].jpg
Brainiac
Side view of the lamp mounting bracket and one of the reflectors
Brainiac attached the following image:
P1000714[448].jpg
Brainiac
A shield over the reflectors prevents beans from lodging on top of the reflectors and burning
Brainiac attached the following image:
P1000751[449].jpg
Brainiac
Electrical connector inside the roast chamber is ceramic, cables are high-temperature insulated (but no asbestos, please!)
Brainiac attached the following image:
P1000721[450].jpg
Brainiac
Lock washers on all fasteners means no metal bits in your coffee. This is the shield over the reflectors.
Brainiac attached the following image:
P1000743[451].jpg
Brainiac
I was lucky to find this surplus power supply housing. Everything fits in here with no awkward mounting jobs.
Brainiac attached the following image:
P1000682[452].jpg
Brainiac
A wrecker?s yard provided the 12 volt motive power for the drum. This has a nylon gear, but temperature doesn?t seem to be an issue.
Brainiac attached the following image:
P1000700[453].jpg
Brainiac
Before we discuss electricals:

I always run my projects through a residual-current device (sometimes called an earth-leakage circuit breaker). A potential lifesaver for all 230 Volt project work (110 might give you a buzz, but 230 will kill you!). I can?t stress this enough ? take care with electricity!Shock
Brainiac
Circuit diagram:
Brainiac attached the following image:
roaster_electrics_schema[454].jpg
Brainiac
Power for the motor comes from a plug-pack power supply ( switched-mode for lots of current and light weight)
Brainiac attached the following image:
P1000697[455].jpg
Brainiac
The temperature control is a beefed-up lamp dimmer control (good for 2000 watt). DPDT switches (one ON/OFF/ON) rated for 230 Volts were used for lamp ON/OFF and drum rotation control
Brainiac
Electrics...
Brainiac attached the following image:
P1000698[456].jpg
Brainiac
I used an IEC mains connector, as I have lots of computer power cables lying around, and it make the machine easier to store. Earth connection to the metal housing was a must.
Brainiac attached the following image:
P1000703[457].jpg
Brainiac
The lock knob for the door is placed on the left so that the action of tightening the knob also closes the door. The screw connector will eventually (probably) be replaced with mains-rated plug and socket setup
Brainiac attached the following image:
P1000758[458].jpg
Brainiac
The bottom support legs are a couple of shelf supports attached with machine screws.
Brainiac attached the following image:
P1000702[459].jpg
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