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allenb
11/28/2023 6:38 PM
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11/28/2023 11:13 AM
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renatoa
11/28/2023 3:52 AM
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11/27/2023 5:52 PM
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 Larry Cotton's 'wobble disc' heat gun build
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| wbbh |
Posted on 12/07/2021 7:45 AM
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 Newbie  Posts: 28 Joined: February 21, 2009 |
^^^ Excellent! |
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| Ploni |
Posted on 12/10/2021 1:23 AM
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1/4 Pounder  Posts: 85 Joined: October 17, 2021 |
I've been intrigued by Larry Cotton's Wobble Roaster which utilizes a heat gun as its heat source. Now I see he has a "wobble" device for a grill so I'm thinking it might be an efficient solution to use with my very effective electric cooking device. I've recorded temps on this cooking unit of over 460�F/238�C. That is hot enough, correct? What do you think of the idea of mounting Larry's grill wobble device on my electric cooking unit (see photos below)?
Ploni attached the following images:
Edited by Ploni on 12/10/2021 6:01 AM |
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| timbarnes |
Posted on 12/11/2021 12:51 PM
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Newbie Posts: 38 Joined: October 25, 2021 |
It should work fine in terms of providing heat. I would want to monitor the element from time to time to be sure it's not overheating. I expect the designer intended for there to be fresh air circulating around the enclosure, so if you want to build this I would make the hood fit on top of the element, rather than sitting on the ground completely enclosing it. Also this will let you control the heat manually during the roast. I roast 300g of beans in a wobble disk roaster with a 1500W heat gun and it seems to work fine. |
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| Ploni |
Posted on 12/11/2021 3:17 PM
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1/4 Pounder Posts: 85 Joined: October 17, 2021 |
Thanks, Tim Barnes. The heating unit is 1400W. Do you think the wobble grill adapter should extend the full width of the heating surface (which I think is ceramic-glass)? Would there be any benefit to removing the ceramic-glass to expose the heating coil? Do you think a wobble device that I build should have a metal bottom like a tea kettle? Edited by Ploni on 12/11/2021 3:24 PM |
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| timbarnes |
Posted on 12/11/2021 6:45 PM
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Newbie Posts: 38 Joined: October 25, 2021 |
Well...some of these depend on your objective and approach to roasting and roasters. For safety reasons I would not modify the burner unless there's a strong reason to do so. If you add a cylinder made from heating duct or aluminum flashing to the bottom of your flour sifter, it should sit nicely over the element. Then you can control the heat easily. In fact, if you use an 8 cup flour sifter, you could simply stand it on the element. I have done this over a gas ring and it worked fine. That way you don't really need to break anything. You can hand wind it or add a motor as you prefer. You don't want a metal bottom I think - better to have your heat source radiate directly to the beans. But you could try both ways. The DIY roaster experience is really one of experimentation, and I don't know how to predict the impact of a solid bottom, except to guess that it would increase thermal mass, and therefore make temperature changes slower. Is that something you think would benefit the roast? I would suggest you try some options yourself, and report back as to what works and what does not. |
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| Ploni |
Posted on 12/12/2021 4:24 AM
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1/4 Pounder Posts: 85 Joined: October 17, 2021 |
Good to get your opinion, Tim. Thanks much. Edited by Ploni on 12/12/2021 5:51 AM |
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| allenb |
Posted on 12/12/2021 7:52 AM
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 Administrator  Posts: 3776 Joined: February 23, 2010 |
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
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| Ploni |
Posted on 12/12/2021 11:20 AM
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1/4 Pounder Posts: 85 Joined: October 17, 2021 |
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 |
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| allenb |
Posted on 12/12/2021 12:20 PM
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Administrator Posts: 3776 Joined: February 23, 2010 |
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. 
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
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| Ploni |
Posted on 12/12/2021 11:49 PM
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1/4 Pounder Posts: 85 Joined: October 17, 2021 |
What if the blower was intermittent? |
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| allenb |
Posted on 12/13/2021 6:01 AM
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Administrator Posts: 3776 Joined: February 23, 2010 |
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
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| renatoa |
Posted on 12/13/2021 6:54 AM
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Administrator Posts: 2728 Joined: September 30, 2016 |
What about a curved (concave) perforated metal plate, allowing the heat pass, but lead/slide the chaff outside the heater surface? |
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| allenb |
Posted on 12/13/2021 7:30 AM
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Administrator Posts: 3776 Joined: February 23, 2010 |
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
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| zamunda |
Posted on 12/13/2021 11:18 AM
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 1/4 Pounder Posts: 172 Joined: November 17, 2020 |
Hello, Actually, I am trying to implement something similar for my pop-corn roaster: ########################
### A lot can happen over coffee ### ######################## |
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| Ploni |
Posted on 12/13/2021 12:59 PM
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1/4 Pounder Posts: 85 Joined: October 17, 2021 |
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 |
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| zamunda |
Posted on 12/26/2021 9:12 AM
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1/4 Pounder Posts: 172 Joined: November 17, 2020 |
Quote 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 Chinese  ):
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:
Edited by zamunda on 12/26/2021 9:29 AM ########################
### A lot can happen over coffee ### ######################## |
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| renatoa |
Posted on 12/26/2021 10:13 AM
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Administrator Posts: 2728 Joined: September 30, 2016 |
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.
Edited by renatoa on 12/26/2021 10:19 AM |
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| zamunda |
Posted on 12/26/2021 11:32 AM
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1/4 Pounder Posts: 172 Joined: November 17, 2020 |
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. That's a good idea! I'll look whether it is available here! ########################
### A lot can happen over coffee ### ######################## |
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| renatoa |
Posted on 02/04/2022 4:15 AM
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Administrator Posts: 2728 Joined: September 30, 2016 |
A new iteration, much more compact: Time for a small cyclone attached, for a complete solution, what do you think ? |
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| zamunda |
Posted on 02/04/2022 8:58 AM
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1/4 Pounder Posts: 172 Joined: November 17, 2020 |
Quote renatoa wrote: A new iteration, much more compact: Time for a small cyclone attached, for a complete solution, what do you think ?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! ########################
### A lot can happen over coffee ### ######################## |
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| renatoa |
Posted on 02/04/2022 9:51 AM
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Administrator Posts: 2728 Joined: September 30, 2016 |
Use this design for inspiration https://www.aliex...18825.html Don't look UP ! ... at the price |
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| DRUMTC |
Posted on 05/13/2023 6:34 AM
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 Newbie Posts: 11 Joined: April 22, 2023 |
Quote Matt Edited by renatoa on 05/13/2023 8:41 AM |
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| renatoa |
Posted on 05/13/2023 9:19 AM
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Administrator Posts: 2728 Joined: September 30, 2016 |
Not sure I get it... Are you the author of M12 roaster ? |
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| Piotrkurak |
Posted on 05/13/2023 9:21 AM
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 1/4 Pounder Posts: 64 Joined: March 01, 2023 |
Comments: heat gun selection is a critical component. The big old fashioned red ones output enough hot air volume to exhaust all the chaff, most cheapo ones don't. Did see an appropriate 220v powered hair dryer in a B&B in Italy. Dry process beans have the most chaff, typically erupting at 1st crack. With the Ryobi drill on the beaters, I can get to 1lb in mine, weight is restricted by bean size and torque to agitate. Typical roast of 200+ grams is relatively effortless but messy Not sure about $50 usd max, the 9" stainless sifter was $35 and the heat gun was $35 also. Wood scraps and tablesaw use was free Edited by Piotrkurak on 05/13/2023 9:28 AM |
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| renatoa |
Posted on 07/14/2023 3:03 AM
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Administrator Posts: 2728 Joined: September 30, 2016 |
Updates... |
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