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Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Bread Machine Roasters

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Wood covered bread maker roaster
Mad Mac	#1 Posted on 10/26/2014 12:11 PM
1/4 Pounder Posts: 55 Joined: October 25, 2014	Here's my setup. I made a plywood cover just to for proof of concept. I wanted to build one from metal. To my surprise, the plywood held up. I insulated the heat gun nozzle with fiberglass cloth. Here's a video: http://youtu.be/o7WjbvNoKCc?list=UUoz-Q64UrquW8NoTTu1wwwA


Koffee Kosmo	#2 Posted on 10/26/2014 5:12 PM
Administrator Posts: 1606 Joined: December 31, 2008	Hi Mad Mac - it's a great idea to stop heat escaping I do however have safety reservations on using timber or ply as overtime it may burn Metal is OK but can be hot to handle So as I recomended to an coffee roasting enthusiast some time ago, the best material to use is clay that is molded to the shape required KK I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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HoldTheOnions	#3 Posted on 10/27/2014 8:32 PM
1/2 Pounder Posts: 205 Joined: October 26, 2014	Just a thought, but maybe slather a layer of pure silicone caulking on the underside to insulate the wood? :-)


Mad Mac	#4 Posted on 10/27/2014 8:42 PM
1/4 Pounder Posts: 55 Joined: October 25, 2014	It works well for me. Sure I don't recommend this for anyone else and your safety concerns are valid. I made an exhaust port because a sealed chamber overheats the heat gun. I've roasted on this several times. I roast outdoors. Our ambient air temp here is 84.2F. Believe me, for us that is chilly. I've roasted City to Vienna and the temp is nowhere near wood's flash point. Edited by Mad Mac on 10/27/2014 8:54 PM


Koffee Kosmo	#5 Posted on 10/28/2014 5:34 AM
Administrator Posts: 1606 Joined: December 31, 2008	I am all for heat capture and deflection to be reused again So as a precaution I would smear a some Hi Temp RV silicone on the timber ply and add a metal heat deflector shield plate, cut to the exact size to the timber ply cover I am also uncertain how the glues that bind the plywood together reacts to heat and if those glues may release chemicals to infuse with the roasted beans during the roast KK I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Mad Mac	#6 Posted on 10/28/2014 5:47 AM
1/4 Pounder Posts: 55 Joined: October 25, 2014	Is heat capture and deflection going to improve the taste of my coffee?


Koffee Kosmo	#7 Posted on 10/28/2014 5:58 AM
Administrator Posts: 1606 Joined: December 31, 2008	Quote Mad Mac wrote: Is heat capture and deflection going to improve the taste of my coffee? Yes it will That's how I have designed my roaster KK I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Mad Mac	#8 Posted on 10/28/2014 6:00 AM
1/4 Pounder Posts: 55 Joined: October 25, 2014	What aspects of flavor will change?


Koffee Kosmo	#9 Posted on 10/28/2014 6:12 AM
Administrator Posts: 1606 Joined: December 31, 2008	More chocolate is one that is most prominent when roasting to second crack I feel that caramelisation is helped and enhanced KK I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
	Web

Mad Mac	#10 Posted on 10/28/2014 6:16 AM
1/4 Pounder Posts: 55 Joined: October 25, 2014	I see. I'll look into my options.


Mad Mac	#11 Posted on 10/31/2014 10:16 PM
1/4 Pounder Posts: 55 Joined: October 25, 2014	Another good roasting session. 231C air temp brought my Benguet beans to Full City.


Mad Mac	#12 Posted on 11/24/2014 1:44 AM
1/4 Pounder Posts: 55 Joined: October 25, 2014	I tried coasting the beans this week. Maintained 215C-200C chamber temp for full city. Maintained 200C-215C for City. I was turning the heat gun on and off. I liked the result. Now I am in search of ways to precisely regulate my heat gun. Initially I was thinking of a 220V CNC controller. Just plug the gun on it and control the fan and heating elements as one unit. What are my options without breaking the bank?


Lawnmowerman	#13 Posted on 11/24/2014 12:03 PM
Pounder Posts: 546 Joined: March 14, 2012	If a router speed controller is readily available I would go with that. I looked up CNC controller, it seems awfully expensive. I'm using a router controller now, and will soon be coupling a cheap digital multimeter to the heat gun. By monitoring the voltage at the heat gun, I will be able to repeat the settings instead of just guessing the knob positions. It may not be a good idea to sink too much money into a bread maker roaster. When the bushing in the breadpan fails, you pretty much need a replacement bread machine,(or breadpan) .I had poor results toggling the heat gun switch. Uncontrolled stalling. A speed controller AND a sealed lid with exhaust out the bottom cured the problem. Hope this helps. Bad coffee prevails when good coffee roasters stand by and do nothing.


allenb	#14 Posted on 11/24/2014 7:14 PM
Administrator Posts: 3627 Joined: February 23, 2010	Quote Mad Mac wrote: Now I am in search of ways to precisely regulate my heat gun. Initially I was thinking of a 220V CNC controller. Just plug the gun on it and control the fan and heating elements as one unit. What are my options without breaking the bank? I agree with LMM on the router speed controller. On controlling the fan and heat with one control? I've seen this work with a small fluidbed I've used in the past. I had initially thought that the airflow would drop at a faster rate than it did when reducing voltage to the whole roaster. For what ever reason, blowers seem to react much less to a reduction in voltage compared to the amount of heat reduction. In your situation, not needing a specific amount of blower power to loft beans makes it more probable that it will work for you. Allen 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


Mad Mac	#15 Posted on 11/24/2014 9:09 PM
1/4 Pounder Posts: 55 Joined: October 25, 2014	I agree with you on not spending too much on this setup. Perhaps a cnc controller is too pricey for the intention. I saw this listed at a local site. Well something like this. Goes 50C to 320C. I believe that covers my roasting range. Can these oven thermostats handle the power of a 2000w heat gun? It's a Rainbow Thermostat. It has three terminals. I am guessing the third switches the heating element on and off.


Lawnmowerman	#16 Posted on 11/25/2014 6:31 PM
Pounder Posts: 546 Joined: March 14, 2012	An oven thermostat will handle 2000 watts. Yes. Will it work on a coffee roaster? I have no idea. It might work similar to a turbo oven with that on it. Ben Bad coffee prevails when good coffee roasters stand by and do nothing.


allenb	#17 Posted on 11/25/2014 8:05 PM
Administrator Posts: 3627 Joined: February 23, 2010	Whether it will handle 2000 watts depends on what it's intended for. Some mechanical oven stats are for controlling gas valves instead of resistive heating elements. Most mechanical oven thermostats have a fairly wide cycling differential and many I've tested had at least 10 degrees F and most of them were closer to 20 degrees. The reason for the wide differential is to limit wear and tear on the stat and relays. I wouldn't recommend it for coffee roasting unless it operates tighter than the ones I'm used to. Allen 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


Mad Mac	#18 Posted on 11/25/2014 10:21 PM
1/4 Pounder Posts: 55 Joined: October 25, 2014	Oh. I thought this was a rheostat. On and off will be no good. I was hoping for a steady temperature for each setting. But this thing will be a hands free version of me manually opening and closing the heat gun. A quick fix perhaps.


Mad Mac	#19 Posted on 12/18/2014 11:41 PM
1/4 Pounder Posts: 55 Joined: October 25, 2014	Put a head gun handle stand. It keeps the gun vertical. 1C temps readings are much lower now. I've gone through a lot of roasting sessions now and the setup works very well. But lately I've been controlling heat when I hit 1C. I more or less keep the temp around 1C temp or 175C for my 100g batch. I stop when there is very few late roasters or the light colored ones. I hit City roasts. Mad Mac attached the following image:


nixda	#20 Posted on 12/29/2014 3:48 PM
Newbie Posts: 28 Joined: October 28, 2013	I have recently snatched up a Steinel 3002 LCD heat gun. It has a built-in thermocouple. One can set the temperature in 10-degree increments; the heat gun will then adjust to provide air with that temperature. The air flow can be regulated as well, with the temperature being maintained all the time. The reaction time is very fast; it takes only a couple of seconds for the heat gun to settle on a new temperature. I feel I have quite a bit more control over my profiles; they are more stable and smooth, compared to the simple heat gun I had previously used. I think that's as far as I want to go with my setup. Providing full control by using a PID controller would require separating the fan and heat controls. Maybe later. Perhaps you can find a used programmable LCD heat gun and give it a try.

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