topbanner.gif
Login
Username

Password




Not a member yet?
Click here to register.

Forgotten your password?
Request a new one here.
Shoutbox
You must login to post a message.

renatoa
02/04/2023 1:40 PM
Welcome, ediblemanager

allenb
02/02/2023 4:22 PM
bcoffeedrinker Welcome

renatoa
01/31/2023 1:17 AM
pouringZabbaskeema

renatoa
01/29/2023 4:55 AM
Welcome, drygrounds and CarlHaberfeld,

renatoa
01/28/2023 5:42 AM
ramsamorrow, VirTERM and Columbia, coffee drink

In Memory Of Ginny
Donations

Latest Donations
dmccallum - 10.00
JackH - 25.00
snwcmpr - 10.00
Anonymous - 2.00
Anonymous - 5.00
Users Online
Guests Online: 14

Members Online: 0

Total Members: 7,788
Newest Member: ediblemanager

View Thread

Who is here? 1 guest(s)
 Print Thread
Wood covered bread maker roaster
Mad Mac
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.

i97.photobucket.com/albums/l225/ginopunsalan/References/RoasterCover2_zpsb988e8da.jpg

i97.photobucket.com/albums/l225/ginopunsalan/References/PA160321_zps7ba85970.jpg

i97.photobucket.com/albums/l225/ginopunsalan/References/IMG_1951_zps92d266a9.jpg

Here's a video:

http://youtu.be/o7WjbvNoKCc?list=UUoz-Q64UrquW8NoTTu1wwwA
 
Koffee Kosmo
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.
 
HoldTheOnions
Just a thought, but maybe slather a layer of pure silicone caulking on the underside to insulate the wood? :-)
 
Mad Mac
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
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.
 
Mad Mac
Is heat capture and deflection going to improve the taste of my coffee?
 
Koffee Kosmo

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.
 
Mad Mac
What aspects of flavor will change?
 
Koffee Kosmo
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.
 
Mad Mac
I see. I'll look into my options.
 
Mad Mac
Another good roasting session. 231C air temp brought my Benguet beans to Full City.

i97.photobucket.com/albums/l225/ginopunsalan/Garden_zps67d6c949.jpg

i97.photobucket.com/albums/l225/ginopunsalan/References/IMG_2041_zps9f2d18b0.jpg
 
Mad Mac
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
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

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
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.

i01.i.aliimg.com/photo/v0/107641389/Rainbow_Thermostats.jpg
 
Lawnmowerman
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
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
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
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:
img_2147.jpg
 
nixda
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.
 
Jump to Forum:

Similar Threads

Thread Forum Replies Last Post
Espresso maker under 100$ ALL ABOUT ESPRESSO MACHINES 26 02/04/2023 3:02 AM
Bellwether Roaster Drum Roaster (Store Bought and Commercial) 17 02/01/2023 8:12 PM
Android App: Coffee Roaster Free ROASTING SOFTWARE APPS 2 01/30/2023 10:32 AM
"Well tempered roaster" more feedback Roasting Coffee 34 01/20/2023 2:30 AM
HearthWare Roaster Value? JAVA TRADING COMPANY 8 12/28/2022 7:17 AM
Homeroasters Association Logo, and all Content, Images, and Icons © 2005-2016 Homeroasters Association - Logos are the property of their respective owners.
Powered by PHP-Fusion Copyright © 2023 PHP-Fusion Inc
Released as free software without warranties under GNU Affero GPL v3
Designed with by NetriX
Hosted by skpacman