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CharcoalRoaster
11/04/2019 1:58 AM
+1 snwcmpr

snwcmpr
11/03/2019 2:16 AM
Can we make the shoutbox UNAVAILABLE until a member has a certain number of posts?

allenb
11/01/2019 2:20 AM
Funopt, please post in the gas and electric heat sources forum

Funopt
10/30/2019 5:17 AM
Can someone help me for using forced propane burner as my heating element. I rather want to use lpg than electric. Do you think it would work

snwcmpr
10/22/2019 5:31 AM
Thanks to you all....... I was not sleeping ... I stayed awake worried about it all. :)

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How to control a fluidbed roast profile?
oldgearhead
tamarian wrote:

OGH, since I'm back to recycling, how is your "door" designed to control the mixture of ambient air and recycled hot air?


The 'water' door (located on top) is open during the drying phase and again during the finishing phase, this changes the ambient:RC ratio by about 20%. Also the rear panel of the brewer has been converted to an up/down sliding door. This door has three positions 70F (top), 50F(middle), and 30F (lowest).

I agree with Roaster Rob, your RC seems a bit wide of the desired (d=h) for the green coffee column. I can roast 500g of decafe to full-city with 1000w in 11 minutes, using 120VAC. So I think 1500w/pound is a conservative rule to use for electric roasters.
No oil on my beans...
 
tamarian
A new RC is underway, RoasterRob style :) . A 75cm long 4 inch steel pipe with a 6 inch base to make it fit on top and around the mouth of the heating chamber. Now that I'm working on it (drilling for thermocouples and maybe cut for a glass window, I'm having second thoughts

1. if a 3 inch pipe would be better for 1 KG?
2. If perforation is better done in the center, or make a 60 degree slope with perforation on the edge? I kind of like the center fountain action, but in the end, it's about the quality of the roast and degree of control on the profile.
 
http://english.varietalcafe.com
RoasterRob
JMO but 3" would be too narrow for 1 kg. 4" should work with a tall enough RC.
Rob
VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
 
RoasterRob

2. If perforation is better done in the center, or make a 60 degree slope with perforation on the edge? I kind of like the center fountain action, but in the end, it's about the quality of the roast and degree of control on the profile.


My Preference is for perf to one side IMO it takes less air flow to start the bean column flowing, the TC can be in the bean mass and in theory be further out of the air flow. But as I said this is JMO.

Rob
VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
 
oldgearhead
I went for the 'fountain' approach with a cocktail shaker lid. There is bit of 'stacking' near the end of the roast, but roasts are very even and controlable...
No oil on my beans...
 
Dan
By stacking, do you mean that the top portion isn't moving as well as you'd like? If so, then making the RC a little larger in diameter should fix that, or reduce your roast volume a little.
 
http://www.intactamerica.org
oldgearhead
Dan wrote:

By stacking, do you mean that the top portion isn't moving as well as you'd like? If so, then making the RC a little larger in diameter should fix that, or reduce your roast volume a little.


Oh no, the top to bottom movement is fine but the center 'spout' isn't as pretty during the last 3 minutes of the roast. I have played a bit with plugging some holes, and things do change, but I wouldn't think of changing anything...
No oil on my beans...
 
oldgearhead
Cocktail Shaker (3.5') top:
oldgearhead attached the following image:
dsc_5397-2.jpg

No oil on my beans...
 
tamarian
Here's how it looks like now. a 75cm long 4 inch pipe, sawed off on the side to insert a glass window (a bathroom shelf) and a towel bar for a handle. 1 KG reached second crack in 15 minutes. It was very slow ramp at the end, due to some hot air leaks, so I need to work on that. Video is being uploaded and will post shortly.

forum.homeroasters.org/forum/attachments/img_20120612_170322.jpg
tamarian attached the following image:
img_20120612_170322.jpg
 
http://english.varietalcafe.com
tamarian
Video of green beans
 
http://english.varietalcafe.com
tamarian
1st crack



Perforation is done at the center, or what was the center, before I added the glass and stainless steel sheet to fill the void under the glass. So this makes the flow a bit fast closer to the glass. I think I'll go ahead and make the flow come from the left side, and down from the right side. This way I can see agitation and keep my self entertained during the roast :)
 
http://english.varietalcafe.com
ciel-007
ThumbsUpTamarian, that's very impressive... congratulations!ThumbsUp
Ciel... seeking Heaven in my cup with ................................................................................................................. EXPOBAR Brewtus II - MAZZER Mini E - MAHLK�NIG Vario - GeneCafe - RAF-1 Extreme (Modified B-2 HOTTOP) - BellaTaiwan XJ-101
 
seedlings
Great job on the roaster! In V2 (heh, heh, heh) if you use an asymmetrical roast chamber it will help with the 'bouncing' beans. Mine is (well, was... since it's currently OOS) asymmetrical and it has very little bounce to the beans. Also might be able to reduce flow to help in that regard.

I'm not complaining! Heck-of-a nice job!!

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
tamarian
Perforation changed from the center to the side. Here's a video:

 
http://english.varietalcafe.com
tamarian
After sealing leaks, reducing hole count, tested with one lb and it went quite fast, 1C in 4-5 minutes. Didin't have 1 kg sacrificial beans, so I re-roasted a previously sacrifical kg. Noticed that 1 Kg fills up most of the pipe. Does this movement/height look o.k., or is it safer to go 1.5 lbs?

My heat dimmer blew, so control is limited to vacume dimmer
 
http://english.varietalcafe.com
JETROASTER
That looks great! .....how does it taste?? Nice build btw.
-Scott
 
tamarian
freshbeans wrote:

That looks great! .....how does it taste?? Nice build btw.
-Scott


Thanks! Haven't thought of tasting it. These are sour beans, I use them for testing. I'm saving the good beans for the heat gun till I get myself tuned to this roaster.
 
http://english.varietalcafe.com
tamarian
Just roasted 500 grams of Tchembe and it went great. I'll simply add a 100 grams each time to find the best load capacity in terms of heat and agitation.

I've also added a chaff collector to protect the blower and my PC. Here are some pics:
tamarian attached the following images:
20120620_140135.jpg 20120620_135620.jpg 20120620_135235.jpg
 
http://english.varietalcafe.com
tamarian
Got to work a bit on the box/wiring and PID. Won a Fuji PXG4 on eBay and awaiting arrival. Tested and working with a regular PID, no profile steps but works manually by entering a temp to go to and a time to reach, repeat for each stage.

The box containes the blower dimmer, switches for PID, lighting and cooling, two fuses, one for the heater 32A and one for the rest, 16A, plus a 32A breaker used to bypass PID if/when needed. PIC attached.

The box is an IKEA shelving/drawer unit. The face comes off and snaps back on.

Next, will re-wrap the heating element on some new Mica sheet to avoid repairs to the tiles used.
tamarian attached the following image:
20120707_174925_1.jpg
 
http://english.varietalcafe.com
allenb
This is turning out to be a great fluidbed build! I like your use of parts and especially the removable lid translucent control cabinet. Makes for quick access when making mods to the controls.

I think you're going to be impressed with the Fuji PXG controller.

Keep the photos coming and once you've got the roaster where you want it be sure to shoot us cupping results.

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
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