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renatoa
09/27/2022 7:35 AM
Welcome, @sihar and plf5

allenb
09/26/2022 11:12 AM
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09/21/2022 6:56 PM
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09/16/2022 12:45 AM
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Larry Cotton's 'wobble disc' heat gun build
Ploni
Good to get your opinion, Tim.

Thanks much.
Edited by Ploni on 12/12/2021 5:51 AM
 
allenb
If any chaff will be able to fall onto the glass cooktop surface, you will have lots of burning/smoking chaff as it drops onto it which will obviously taint the roast if not cause flames to reach the beans. A metal bottom between the glass and sifter screen will do the same once it gets up to any temperatures hot enough to roast.
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
Ploni
So what's the solution?

1. Vacuum attached to the bottom portion of the roaster?
2. Metal and/or metal mesh just above the glass to catch the chaff?
3. Set the roaster on legs with a 3–5 mm. gap above the glass and a blower to push the chaff off before it can burn?
4. Start drinking instant?
Edited by Ploni on 12/12/2021 11:35 AM
 
allenb
Well, unfortunately, there aren't many work arounds for any roaster design where chaff will fall down onto a radiant or electric tubular heat source. All viable designs where beans are agitated on a screen have those heat sources from side or top for this reason.

Trying to blow room temperature air across the heating surface will cool the environment temp too much.

Metal mesh just above the heating surface will still cause burning chaff plus blocking of radiant heat towards beans.

Instant can cause depression and indigestion. thumbdown
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
Ploni
What if the blower was intermittent?
 
allenb
That may work as long as it is only short pulses in duration. As you know, later in the roast, there is a time where chaff is pretty constant but it may be worth a try and may work.
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
renatoa
What about a curved (concave) perforated metal plate, allowing the heat pass, but lead/slide the chaff outside the heater surface?
 
allenb
Might be worth a try but would need to be a steep cone shape or chaff would most likely just lay on all surfaces of a concave dome and not slide down to the edge without giving the roaster repeated taps.
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
zamunda
Hello,

Actually, I am trying to implement something similar for my pop-corn roaster:

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Ploni
Thanks for all the input.

Gonna have to let all this ferment awhile.

Gonna also have to get creative because the three components of Larry's Wobble Roaster (sifter, heat gun, cordless screwdriver) are not to be found here and the cost of purchasing online with shipping and taxes is outrageous.

Maybe renatoa's remark is the way to go.

And, zamunda, your chaff trap is really working well!

If I incorporated zamunda's chaff-trap design, would I have to incorporate a blower as well . . . or would the naturally rising heat push the chaff up into such a trap?
Edited by Ploni on 12/14/2021 6:27 AM
 
zamunda

Quote

zamunda wrote:

Hello,

Actually, I am trying to implement something similar for my pop-corn roaster:


Based on the above, I built this simple chaff collector which turned out to be quite effective.

I found the parts in a local shop (run by ChineseGrin):
  1. kitchen sieve
  2. food tray for dogs/cats


The chimney I had built before from an old coffee flask which fitted perfectly in the roaster. I made hole in the tray by cutting a "star" in the center with a small disc cutter, then pushing back the remaining triangles gives me an opening where I could push in the chimney. It is important to turn the tray upside down to enable it to catch the chaff.
zamunda attached the following images:
img_3075s.jpg img_3074s.jpg img_3073s.jpg screen_shot_2021-12-26_at_091842.png 550x249.jpg

Edited by zamunda on 12/26/2021 9:29 AM
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renatoa
Nice job !
Even better, instead a single big hole, multiple narrower radial cuts would also impede some beans jumping out in the chaff tray.

An alternative to that bowl could be a Bundt pan, having hole already opened, so no cut job required.
And higher funnel results into bigger chaff catch volume. Grin
Edited by renatoa on 12/26/2021 10:19 AM
 
zamunda

Quote

renatoa wrote:
An alternative to that bowl could be a Bundt pan, having hole already opened, so no cut job required.
And higher funnel results into bigger chaff catch volume. Grin

That's a good idea! I'll look whether it is available here!
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### A lot can happen over coffee ###
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renatoa
A new iteration, much more compact:



Time for a small cyclone attached, for a complete solution, what do you think Grin ?
 
zamunda

Quote

renatoa wrote:

A new iteration, much more compact:



Time for a small cyclone attached, for a complete solution, what do you think Grin ?


Thanks, Renatoa, this looks really nice!
Yes, a chaff collector would be a easy to add...
I will make a proof-of-concept as soon as I got time and let you know!

Thanks and regards!
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### A lot can happen over coffee ###
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renatoa
Use this design for inspiration Grin

https://www.aliex...18825.html

Don't look UP ! ... at the price Grin
 
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