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· 04/08/2020 7:42 AM
daniboy... You will best get an answer if you post in the forum. And the reply will be available afterwards, also.

· 04/05/2020 10:37 PM
i need wiring modification for westbend poppery I that has AC fan with rotary dimmer and AC fan speed control switches Thank you!

· 04/02/2020 4:50 AM
Morning Ed, I haven't done any green coffee hoarding yet but am hoping the supplies don't end up like the toilet paper isles!

· 03/31/2020 2:53 PM
Hey Ed. Thanks. roar

· 03/31/2020 11:21 AM
Hey quarantined home roasters! I hope you have great coffee! If they have a run on coffee, I hope you're set with your great home roast! Find me on Facebook! Ed Needham

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6kW Electric Air Roaster
It was from eBay. I don't have the exact ad any more but it was probably this one. Probably the 20cm one but I did order a few sizes and they're not very accurate.


greencardigan wrote:

Next task is to build a chaff collector so I can roast non decaf without making too much mess.

Hey Greencardigan,
Did you ever figure out how to add a chaff collector to this?
I tried and failed! Shock

I bought two of the small aluminium cyclones from ebay but i think I have too much airflow for them to work properly. I was getting a reasonable amount of chaff passing through the cyclones.

I'm now reverting back to a simple mesh basket sitting on top.
greencardigan attached the following image:
Nice dual setup ! Why not install mesh at the cyclone air exit too, keeping the chaff inside.
Or, another take, why not mount the cyclone as series instead parallel ;) I mean pipe the output of first cyclone to the input of the second.
I think my problem was I was forcing too much flow through even with two in parallel. Two in series would be worse I think with greater restriction.
I have a small amount of chaff escaping the exhaust on the transparent roaster as well. My blower is putting about 17-19 cfm through the cyclone. I think that is in the acceptable range for the cyclone specs.

The chaff escape problem may be from not having a large enough (larger diamter) chaff collection container... I'd say 99% is contained on mine, which has about an 86mm inner diameter chaff collector. Renatoa's idea of a mesh sounds good if the collection container can't be modified.
I am using this cyclone in a turbo oven setup, so air does not enter into cyclone by natural pressure from RC, but must be sucked using an external blower instead.
For this purpose I fitted a 10 cm / 20W inline hydroponics extractor fan that is rated for 140m3/hr ~ 82 cfm, that sounds enormous, but the feeling is not at all comparable with the airflow of a FB. Probably the specs of chinese ebay fan are fake.

Anyway, it does a good job as separation, no chaff thrown out until the chaff level approach the lower exit of the cyclone, that's the moment when it start to see sporadic flakes in the air. I am using a flour sieve in that moment, to cover the fan exit Grin.
I don't know what flow rate I get through my beans from my 600W vacuum blower, but the noise of the air whizzing around through the cyclones was probably louder than the roaster itself!
Greencardigan, you're right they can be loud. In Canada, our 3/4" threaded copper pipe coupling (male or female) has an outer diameter just under 25mm. One can be placed into the top exhaust and it acts kind of like a muffler... in some way it changes the turbulence on the way out and quiets the whistle or whizzing sounds.

Here's an image with the specs for these cyclones to work as intended.
CK attached the following image:

Edited by CK on 01/14/2019 6:21 PM
I don't understand the relationships between power and airflow, if any...
As I wrote, my exhaust fan specs are 20W only and 140 m3/h... completely off versus the cyclone.
So what fan should I use instead, for the best suction parameters ?
Here's my alternative chaff collector. It worked perfectly with very close to 100% captured. Sometimes the simple option is best.
greencardigan attached the following image:
Hmmm... chaff is not only flakes, but a lot of dust too, almost flour.
I would place this sieve inside of an... "expansion" recipient, or at least inside an exhaust tube.
Will see what mess will build inside that tube, even in one month...
True, the smaller dusty bits could get through but I'm not too worried about that. I roast on the verandah of my apartment and just want to stop the larger visible chaff from drifting down onto verandahs below.
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