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CoffeeAir II Roaster Build
Dan
I would put the TC for controlling the roast at position 3. That way, the beans are receiving very even heat. Also, the PID can react quickly to changes. Then, I'd put a thermometer at position 2 to monitor the roast itself.
 
seedlings

Quote

Dan wrote:
I would put the TC for controlling the roast at position 3. That way, the beans are receiving very even heat. Also, the PID can react quickly to changes. Then, I'd put a thermometer at position 2 to monitor the roast itself.


That's what I was thinking. Also, since it will be permanently mounted under the hopper, the hopper will be removable, which solves my other problem.

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
RoasterRob
Hi Chad TC placement - IMO one tc at 1 or 3 just below or only just above the perf plate. This is the temp you need to know to affect the roast temp rate. TC 2 should be at the top of the sloped plate (or just above) just in the top of the beans at the start of the roast this keeps it in the beans mass where there is the least influence from the air temp.
I only have a tc in position 2 which i use to profile based on rate of change only. Works well for me.

Rob



VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
 
seedlings
Last night I tested electronics and everything works. For test purposes, I put the TC right above one of the heat elements, and with the airflow on it's lowest setting, blowing into free air (no hopper), the temperature stalled around 250F with the PID set temp at 315F. Hmmm....

Now I'm fabricating the TC permanently into the design - hopefully to try a roast soon...

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
seedlings
Just had some moderate success at lunch break. I got 2 pounds of beans to first crack in 12:00.... but ...

For some reason the Fuji PXV3 wouldn't let me exceed 400F as a setpoint...? Have to read the manual. Also, the TC (between the heat and the bottom of the hopper) was reading very low compared to the thermometer I stuck down in the top of the beans. The bean thermometer was regularly 100F above the K-type TC by the heaters.

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
JETROASTER
I'm sorry for your pain. I am however watching closely so I can copy.
It's coming together very nice. Scott
 
Dan
I think there is an upper limit for each TC type, but its been a while since I programmed a Fuji.
 
Unta
chad,
ive had similar results with my TC in the air stream, depending on where I was in relationship to the inlet of the roasting chamber dramatically effected the reading. The closer i moved to the perferated plate the better,usually warmer than what the Bean temp was reading, but again im pulling not pushing so that might effect exactly how the air is moving,, turbulance or lack there of.

Q? Can you create a removeable TC and get it into the beans in position 2?just something you can take out before dumping.
sean
Sean Harrington
educate.
 
seedlings
TC not working where it is (position 3) kind of REALLY sucks because it's sandwiched in a groove between cement board pieces, sealed with silicone. It would be easier to get a new TC than remove this one.

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
seedlings
I found the Fuji set to J-type TC instead of K-type, plus moved the Upper Limit temp to 800F (up from 400F).

After those changes, I put the Set Temp to 460F and turned it on with the same half-roasted beans. It took about 15 minutes to get them to 460F (bean temp thermometer stuck down in the beans), rolling second crack. However, the TC under the hopper only read in the 420s, and I don't understand that. For the first several minutes the ET probe read higher than the BT probe... after that, the BT read higher and corresponded to second crack temperature of ~440F...???

So, I *can* roast 2# of beans in this beast.

It's time to permanently mount the control box and put some finishing touches on th enclosure. In the near future I'll add an outdoor vent (much more smoke/chaff with 2# beans than my normal 1.25# charge).

Pics and video to come maybe this weekend.

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
dja
Chad;
Most of the Fuji PID controllers have a autotune function on them, you might want to get some junk beans or even use something like navy beans(never did like the Navy) and let it run a cycle or two to tune the thing.ThumbsUp
this has been a while in the making, maybe mine won't take so long, have to pick up a short section of 2" OD 1/4" wall tube today and the easy part is done except for the make me pretty stuff that comes at the end.

David
I pour Iron and roast Coffee BeansThumbsUp
If life seems normal your not going fast enough Mario Andrette
 
seedlings
Yeah, David, your project will hopefully be running much, much quicker!

I'll mess with the autotune- good idea with navy beans.

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
dja
well it moves beans, at least the ones that I can keep in the tube.

If the included link works it will show me making a mess of trying to see if 1.5 pounds of green will flow in the monster that I have created.

http://www.youtub...oLl_9LWf2c
Edited by seedlings on 09/03/2010 7:45 AM
I pour Iron and roast Coffee BeansThumbsUp
If life seems normal your not going fast enough Mario Andrette
 
Unta
looks good david, what are you running the air though? full width perf plate or something else?
Sean Harrington
educate.
 
allenb

Quote

dja wrote:
well it moves beans, at least the ones that I can keep in the tube.

If the included link works it will show me making a mess of trying to see if 1.5 pounds of green will flow in the monster that I have created.

http://www.youtube.com/watch?v=EoLl_9LWf2c


David,

I tried to make the Youtube button work but forgot about the issues with it presently.

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
dja
peice of screen wire with a 3/16" spacing in a 1.5 inch opening.
Screen wire sits in the recess cut in the end of this peice.

and the you tube is my first go round with that little monster but I will get it to work.
dja attached the following image:
roaster4.jpg

Edited by dja on 09/02/2010 10:16 PM
I pour Iron and roast Coffee BeansThumbsUp
If life seems normal your not going fast enough Mario Andrette
 
dja
view of bean side of funnel.
Pyrex tube sits on top of this peice, when I am done there will be set screws holding the peices together.
dja attached the following image:
roaster5.jpg

Edited by dja on 09/02/2010 10:19 PM
I pour Iron and roast Coffee BeansThumbsUp
If life seems normal your not going fast enough Mario Andrette
 
allenb
What is the diameter of the glass roast chamber?

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
dja
3.5 inches inside diameter by 14 inches. some type of pyrex baking tube found at thrift store a couple years ago and have helt onto it cause I knew it would make one rocking roaster 360 degree viewingGrin
lets see if this works.

Ok how do we link to a youtube video

Guess Yourtube is one of them sites that isn't allowed or something.

gotta find a vacumn cleaner motor, or a cheap shop vac for air power, and get the heat strightened out and installed and we will be roasting, top of roaster lifts off for easy dumping and all I have to do for a cooler is turn the heat off, also I will have to make some type of cover otherwise the thing will unload on you all over the floor.
Edited by dja on 09/02/2010 10:58 PM
I pour Iron and roast Coffee BeansThumbsUp
If life seems normal your not going fast enough Mario Andrette
 
JETROASTER
Did you say "vacuum motor"? I think there are a couple threads on that around here.
Get an idea of what type is best suited, and I'll dig one out of the bone-yard. -Scott
 
dja
thats what they make flea markets for Scott.

I can pick one up at the flea market for less than the shipping, I could use one of the two that I have but I don't really want my coffee tasting like machine shop coolant. And I know where there is a dude that works on "rug suckers", so I may just have to run by there and see if I can get me one of them high dollar Dyson imports, for like on the cheap.

now back to more important things, how does a person post a video on here.Grin
Edited by dja on 09/03/2010 7:42 AM
I pour Iron and roast Coffee BeansThumbsUp
If life seems normal your not going fast enough Mario Andrette
 
JETROASTER
Most of the Dysons use a single stage Panasonic motor. Nice pressure.
The roaster-chamber base; Is that a little something you popped out of a CNC? Great funnel shape!! -Scott
 
Dan
Shop-Vacs are another source for vacuum motors. I've found that the older, original units develop the most pressure. Or, buy a new unit from Graingers.

Baking tube is a good idea. I hope that the beans don't spout out of the top!
 
dja
all post that I make on my roaster will be in the thread titled AIR ROASTER enjoy
I pour Iron and roast Coffee BeansThumbsUp
If life seems normal your not going fast enough Mario Andrette
 
seedlings
You can see the K-type TC inbetween the two heat elements. With the hopper on (below) the TC is right under the perf.

i206.photobucket.com/albums/bb54/seedlings/100_6844.jpg

i206.photobucket.com/albums/bb54/seedlings/100_6845.jpg

In this quick video the two temperatures read about the same, but with beans they read different (future video). The upper temp reads much higher than the lower temp with beans loaded.

[video]http://www.youtube.com/watch?v=G2eXoa_2Cyw[/video]

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
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