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 My 1kg Electric Air Roaster build
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| JETROASTER |
Posted on 03/22/2011 10:01 AM
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 Administrator  Posts: 1780 Joined: March 06, 2010 |
Good Luck!! -Scott |
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| greencardigan |
Posted on 03/28/2011 3:55 AM
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 1 1/2 Pounder  Posts: 1168 Joined: November 21, 2010 |
Another successful roast! This time I tried a smaller batch. A 600g blend of Tanzanian and Nicaraguan La Bastilla. 1st crack at about 10min and 2nd crack at about 18min. It was still hard to hear the cracks even with the blower section of the roaster closed in. Better but not ideal. I didn't get a full length video. I dont think my phone would record that long. The dogs like it so it must be good.  [video]http://www.youtube.com/watch?v=vmrCRJJIElk[/video] |
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| allenb |
Posted on 03/28/2011 8:41 PM
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 Administrator Posts: 3649 Joined: February 23, 2010 |
Quote greencardigan wrote: Another successful roast! This time I tried a smaller batch. A 600g blend of Tanzanian and Nicaraguan La Bastilla. 1st crack at about 10min and 2nd crack at about 18min. It was still hard to hear the cracks even with the blower section of the roaster closed in. Better but not ideal. Do you have the power to speed up getting from 1C to finish? My experience has almost always been that anything longer than 4 minutes from 1C to 2C results in some flattening/baking. I have experienced exceptions but not many. 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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| greencardigan |
Posted on 03/28/2011 9:52 PM
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1 1/2 Pounder Posts: 1168 Joined: November 21, 2010 |
Yes I should be able to speed it up. I was just wary of turning the fan down too low. I have recorded the minimum fan speed for this roast so I'll have that as a reference for the next roast. |
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| dja |
Posted on 03/29/2011 11:07 AM
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 1 1/2 Pounder Posts: 701 Joined: November 07, 2008 |
now if you have a couple of bean eating show hounds, I happen to have approximately 3 pounds of slowly baked coffee beans that they are welcome to when I get finished with the R&D on this new tube. DAvid I pour Iron and roast Coffee Beans
If life seems normal your not going fast enough Mario Andrette |
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| greencardigan |
Posted on 03/29/2011 4:00 PM
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1 1/2 Pounder Posts: 1168 Joined: November 21, 2010 |
Haha, they're a bit fussy and only eat them if they are still warm. Could your 3# of baked beans be used again to to see if you've got enough heat after your planned modifications? Or do pre roasted beans heat up more easily? |
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| dja |
Posted on 03/29/2011 6:35 PM
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1 1/2 Pounder Posts: 701 Joined: November 07, 2008 |
you hit it on the head I plan on using them again to test with, I know that I can move them I think we've proved that. Its the heat that I have to strighten out and I don't need unroasted beans to do that. I had some Dotor's appoinments this afternoon, but but hopefully this evening I can get a test plate turned out and see if making the area in the roast chamber smaller will increase the heat, hopefully this will fix it, there's lot of room in a tube thats almost 6 inches inside by 16 inches tall. Someone commented on the fact that my plume is so short, I only try to move the beans, I have a round funnel with the air enty in the center I don't know that this really makes a differance other then its the easiest way to build it. I don't have the hassle's of trying to get a slanted plate cut to fit at an angle, it also makes for easier pref plate changes as all I have to worry about is a small diameter plate and I can drill holes in it anyway I want or size for that matter. The plate that I have in it now I drilled too many holes in it, but its thick enough the instead of making a new plate i just tapped some of the holes and screwed in some set screws till I figure out what I really need. I think what is going to happen is that that I will have a pref plate the size of the one in the 4 inch tube. if that happens i will have to make a tapered insert so that I don't have a square corner for beans to sit in and burn. David I pour Iron and roast Coffee Beans
If life seems normal your not going fast enough Mario Andrette |
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| greencardigan |
Posted on 03/29/2011 6:58 PM
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1 1/2 Pounder Posts: 1168 Joined: November 21, 2010 |
I'm wondering if I need more holes in my perf plate. Would that give me a shorter plume? I need to either get a shorter plume, lengthen my roast chamber or install a baffle to keep the beans in but let the chaff out. Cutting an ellipse is not to difficult. I just used some CAD software to draw a template. Stuck it on some aluminium sheeting and cut it out. |
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| allenb |
Posted on 03/29/2011 7:41 PM
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Administrator Posts: 3649 Joined: February 23, 2010 |
Quote greencardigan wrote: I'm wondering if I need more holes in my perf plate. Would that give me a shorter plume? I need to either get a shorter plume, lengthen my roast chamber or install a baffle to keep the beans in but let the chaff out. Cutting an ellipse is not to difficult. I just used some CAD software to draw a template. Stuck it on some aluminium sheeting and cut it out. It's definitely possible that adding more holes/increasing hole size or a combination of the two would fatten the spout and reduce it's height. I would take it one small step at a time though so you don't over do it. Ideally you want just enough spout height to allow good, thorough circulation but with your RC height it should not be launching to the top. 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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| seedlings |
Posted on 03/30/2011 8:16 AM
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 1 1/2 Pounder Posts: 4226 Joined: June 27, 2007 |
If the plume is too high, then you probably have more pressure than you need, so adding holes may or may not help, but slightly enlarging the existing holes will certainly help. 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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| greencardigan |
Posted on 03/30/2011 8:41 AM
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1 1/2 Pounder Posts: 1168 Joined: November 21, 2010 |
I think I might try a baffle in the top of the roast chamber before I do any more drilling on the perf plate. Drilling more or bigger holes could possibly reduce my maximum roast size? |
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| dja |
Posted on 03/30/2011 12:05 PM
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1 1/2 Pounder Posts: 701 Joined: November 07, 2008 |
I forgot to mention, and I see that you have alreay thought about it, a flat piece of sheet metal and half a brick will keep it from blowing off. you vent your roaster outside of you basement don't you, then a regular wood stove damper installed in the vent pipe should work for you. to help build some back pressure but allow the beans to still circulate. in my 4 inch rig I can keep the beans moving and have the damper almost completely closed and as the beans lighten up and the chaff comes off it will choke it off even more. David J. Allen I pour Iron and roast Coffee Beans
If life seems normal your not going fast enough Mario Andrette |
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| greencardigan |
Posted on 04/30/2011 1:19 AM
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1 1/2 Pounder Posts: 1168 Joined: November 21, 2010 |
I have added another 5 holes in my perf plate and did a roast but I'm still getting beans blown out the top of my roast chamber. I seem to get a higher plume with a smaller bean load (600g this time). Here's the roast log using the Artisan software and the TC4. I'm having a bit of trouble getting enough heat after 1C and I end up with a longish roast. Funny as I seems to have heaps of heat at the start of the roast (I have been running at 75% heat for the first 5 minutes).  |
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| RoasterRob |
Posted on 04/30/2011 3:57 AM
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 1/2 Pounder  Posts: 330 Joined: March 03, 2007 |
what size and spacing are your holes? VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
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| RoasterRob |
Posted on 04/30/2011 4:03 AM
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1/2 Pounder Posts: 330 Joined: March 03, 2007 |
ok read and found it. if anything the random bean movement would indicate too much open area. as in holes too big. My plate is thicker than yours, or so it would appear. This might make the difference even though your holes are the same diameter. What total height for your RC?
VBM Minimax 2gp, 1gp Reneka Techno, 2 gp la Pavoni Pub, la Cimbali M28, SJ Maz, FB 6kg HM roaster and other stuff
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| greencardigan |
Posted on 04/30/2011 6:15 AM
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1 1/2 Pounder Posts: 1168 Joined: November 21, 2010 |
It's about 18 or 19 inches from the perf to the top. I wouldn't say the bean movement is too random. I took some more video that I can post here if needed. |
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| Dan |
Posted on 04/30/2011 7:03 AM
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 1 1/2 Pounder Posts: 1662 Joined: October 24, 2005 |
My thoughts are that as the beans lose water and begin to expand, they lose density, making them loft higher. This decreases the backpressure and increases flow. With increased flow the air is diluting your heat. Find a way to decrease air flow. |
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| greencardigan |
Posted on 04/30/2011 7:36 AM
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1 1/2 Pounder Posts: 1168 Joined: November 21, 2010 |
I can easily turn my air flow down further. I guess I'm still worried about burning out my elements if I turn it down too much. |
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| allenb |
Posted on 04/30/2011 9:25 AM
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Administrator Posts: 3649 Joined: February 23, 2010 |
Quote greencardigan wrote: I can easily turn my air flow down further. I guess I'm still worried about burning out my elements if I turn it down too much. All involved in TC4 development, is it possible to easily program a maximum pulse width/output limit? Then the next question would be if one has an input to the TC4 sensing ET can you program a maximum ET setpoint which would be better yet? If this is possible he wouldn't have to be worried about experimenting with air flow. Brad, can you post another vid showing the bean flow issue or is it identical to one of your previous ones? 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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| greencardigan |
Posted on 04/30/2011 10:08 AM
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1 1/2 Pounder Posts: 1168 Joined: November 21, 2010 |
This was from today's roast. Remember that this is only 600 grams green. Probably lighter than ideal for my roaster. [video]http://www.youtube.com/watch?v=iZQ1JGDVa5I[/video] |
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| JETROASTER |
Posted on 04/30/2011 10:15 AM
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Administrator Posts: 1780 Joined: March 06, 2010 |
Quote Dan wrote: My thoughts are that as the beans lose water and begin to expand, they lose density, making them loft higher. This decreases the backpressure and increases flow. With increased flow the air is diluting your heat. Find a way to decrease air flow. Sounds this way to me as well. By using the perf/distributor as a restrictor, you will create back pressure below the perf. The weight loss of the beans will have a less dramatic effect. (The beans will be a smaller part of your overall airflow equation) The airflow across the heat element will be more consistent, and the required adjustments through the roast cycle will be smaller. Looking forward to your progress! -Scott |
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| allenb |
Posted on 04/30/2011 10:18 AM
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Administrator Posts: 3649 Joined: February 23, 2010 |
Dan's theory is correct. From looking at this video you've got way too much heat going up the stack without transferring to beans. You've got to be able to throttle the blower back as the beans lighten up. 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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| greencardigan |
Posted on 04/30/2011 10:51 AM
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1 1/2 Pounder Posts: 1168 Joined: November 21, 2010 |
Quote allenb wrote: Dan's theory is correct. From looking at this video you've got way too much heat going up the stack without transferring to beans. You've got to be able to throttle the blower back as the beans lighten up. Allen I wonder if this is because my RC base is too flat. I suspect there's not enough beans getting pushed into the plume resulting in a less dense plume and wasted heat. |
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| seedlings |
Posted on 04/30/2011 10:57 AM
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1 1/2 Pounder Posts: 4226 Joined: June 27, 2007 |
Looking at the video, you should turn the blower down significantly. In a heatgun, there's a gentle air-flow, so you can turn your flow down to gently loft the beans and be just fine. 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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| greencardigan |
Posted on 04/30/2011 11:19 AM
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1 1/2 Pounder Posts: 1168 Joined: November 21, 2010 |
Ok. Next roast I'll monitor ET and try to turn the air down further without burning out elements. I suppose if I keep ET below 330C I should be ok. So more holes in the perf is definitely not a good option? |
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