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03/04/2021 9:04 PM
I have been trying Scott Rao Hario V60 pourover this week. 1:17 and blooming with 2 parts water the first 45 seconds then splitting the rest into 2 pours. A little stirring is included. We like it.
03/04/2021 11:35 AM
My brew ratio is 1:17 (exactly 59.5 g/L). That's roughly 8.5g per 5-oz cup.
02/27/2021 9:29 AM
I'm looking to hire someone to teach/help me to find the best roast profile for the 3 types of coffee that grow on my farm in nicaragua. I live in LA, but but could go anywhere in so cal with my Behmor for a roasting lesson. Please contact me if you're in
02/17/2021 7:20 PM
When your wife thinks 30 grams for a 6 cup setting is strong, you learn to drink muddy water when you are making coffee for both of you.
02/17/2021 8:32 AM
I use a rule of thumb of 60 grams per liter. 8 cups (1 liter, 32 oz) = 60 grams, 6 cups (3/4 liter, 24 oz) = 45 grams. 10 cups = 75 grams 12 cups = 90 grams
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 Fluidbed Roaster project
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| cdrake39 |
Posted on 04/27/2020 7:52 PM
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 1/4 Pounder  Posts: 76 Joined: August 08, 2019 |
Quote I agree! Not sure if he is a member on this forum or not - but I'll mention it to him |
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| cdrake39 |
Posted on 04/27/2020 7:56 PM
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1/4 Pounder Posts: 76 Joined: August 08, 2019 |
So I'm beginning to wonder if my issue with 'spouting' of the beans is more so related to the shape of my reducer? The steep vertical edges and nearly flat bottom may not be conducive to lofting the beans. I could order a conical reducer (like many others have used), or maybe tack weld an appropriately sized funnel inside the bowl reducer. I guess before I go down that road, do you folks think it may provide a significant improvement?
cdrake39 attached the following image:
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| Vitreous |
Posted on 04/27/2020 10:07 PM
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Newbie  Posts: 2 Joined: April 17, 2020 |
Maybe post a video so we can see what its doing? |
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| cdrake39 |
Posted on 04/27/2020 10:22 PM
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1/4 Pounder Posts: 76 Joined: August 08, 2019 |
Quote Just posted a short video on YT. The spouting seems minimal which is my main concern. The fan power should be sufficient as it was used in another build (referenced a couple posts back) and capable of spouting 250g. So I assume the issue lies with the airflow in my particular setup? Maybe caused by a combination of things (heating element blocking adequate airflow, bowl reducer geometry not "funneling" beans to center, or air flow too high and static pressure not sufficient). Appreciate any feedback you may have! https://www.youtu...JOSbQFh4zE Edited by JackH on 04/28/2020 4:23 AM |
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| CharcoalRoaster |
Posted on 04/28/2020 8:56 AM
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 Pounder  Posts: 598 Joined: April 13, 2012 |
Maybe not enough bean mass to get 100% circulation of the spouting bed? |
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| cdrake39 |
Posted on 04/28/2020 11:07 AM
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1/4 Pounder Posts: 76 Joined: August 08, 2019 |
Quote Not enough? Or too much? I can try 250g this evening to see how it looks! |
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| CharcoalRoaster |
Posted on 04/28/2020 1:00 PM
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Pounder Posts: 598 Joined: April 13, 2012 |
I was thinking not enough because there's not enough weight of the mass to replace the beans being fluidized. Then again, I'm not scientist or engineer just a serial DIYer lol |
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| CK |
Posted on 04/28/2020 2:16 PM
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 1/4 Pounder Posts: 163 Joined: December 07, 2018 |
I'm pretty sure you'll have to get a conical reducer as jbrux4 uses. Without that type of reducer, there will likely be dead spots not circulating the beans on the bottom edges/corners of your roast chamber. |
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| cdrake39 |
Posted on 04/28/2020 2:20 PM
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1/4 Pounder Posts: 76 Joined: August 08, 2019 |
Quote CK wrote: I'm pretty sure you'll have to get a conical reducer as jbrux4 uses. Without that type of reducer, there will likely be dead spots not circulating the beans on the bottom edges/corners of your roast chamber. Yeah, I was thinking that may be an issue. My plan is to 3D print a conical reducer to test that theory (without the heating element wired in of course). If it proves successful, I'll either opt for the tri clamp style reducer, or weld a stainless steel funnel inside the bowl reducer to achieve the same effect. Thanks for the advice! |
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| cdrake39 |
Posted on 05/01/2020 1:44 PM
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1/4 Pounder Posts: 76 Joined: August 08, 2019 |
I 3D printed a conical reducer to test whether or not that would improve the agitation of beans. Seems like a minimal improvement, but it's difficult to tell. See video link below: The specs of my blower are 7kPa (20"H2O) static pressure and about 28 CFM airflow. Perhaps this just isn't sufficient? Or maybe I'm overthinking it and expecting too much agitation lol |
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| pisanoal |
Posted on 05/01/2020 1:54 PM
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1/4 Pounder Posts: 96 Joined: October 11, 2019 |
I think it looks like there are less dead spots in the video with the conical insert. I'd say that is probably sufficient for the beginning of the roast. It should get a lot better as the roast progresses. |
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| Husamka |
Posted on 05/04/2020 8:57 PM
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1/4 Pounder Posts: 56 Joined: September 16, 2016 |
I need your advice, which of these attached RCs design is better for beans circulation for 500-700gr capacity?
Husamka attached the following images:
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| CharcoalRoaster |
Posted on 05/05/2020 7:49 AM
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Pounder Posts: 598 Joined: April 13, 2012 |
The one on the left (first). The bowl shape might have dead spots when it drops into that little section on the other one. |
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| Husamka |
Posted on 05/06/2020 1:51 AM
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1/4 Pounder Posts: 56 Joined: September 16, 2016 |
CharcoalRoaster, Thank you. I was thinking the right one has more capacity but still smooth circulation is more important.
Edited by Husamka on 05/07/2020 12:20 AM |
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| cdrake39 |
Posted on 09/24/2020 12:35 PM
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1/4 Pounder Posts: 76 Joined: August 08, 2019 |
Well, I'm finally back to working on the roaster and almost ready to fire it up. Before I do so, I have a few question regarding wiring that I would like to run by you folks first (not an electrician, so I have a cautious fear of DIY wiring). If anything in the wiring photo stands out as an issue, please let me know. Just bought a new house and would prefer not to start any fires :p All connections will be covered with heat shrink when finalized For context: 12VDC Blower motor is controlled with the driver, with an approx power rating of 200W Arduino will be powered via USB from laptop Heating element is 1740W @ 120V (14.5A) All wiring is 12 AWG Heating element tube has a layer of mica, and the thermal fuse is wired in series with the hot wire The 3 white dots are where the main AC power cord connects The GND wires connected with the screw will be bolted to the enclosure The stray wires coming off the DC driver won't be needed for TC4+ control Should I wire an inline fuse? Or an on/off rocker switch?
cdrake39 attached the following image:
Edited by cdrake39 on 09/24/2020 12:44 PM |
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| jessep |
Posted on 09/27/2020 3:39 AM
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Newbie Posts: 33 Joined: January 05, 2019 |
Quote You could stick a circuit breaker in there at the AC side just to make sure nothing happens, or just rely on the house breaker :) Looks good to me. I also grounded all the metal parts so if the element burns up or a wire gets lose and manages to find it's way out of the element/mica and touch the housing it should blow the breaker before doing too much welding. I currently rely on the relay to be my on/off switch and leave the AC plugged into the machine. As long as the USB is disconnected, it "should" stay disabled. I feel like a physical switch could add another level of safety and also a physical "kill" switch if the controller get's a bit too aggressive. |
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| allenb |
Posted on 09/27/2020 7:30 AM
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 Administrator  Posts: 3333 Joined: February 23, 2010 |
Quote I currently rely on the relay to be my on/off switch and leave the AC plugged into the machine. As long as the USB is disconnected, it "should" stay disabled. I feel like a physical switch could add another level of safety and also a physical "kill" switch if the controller get's a bit too aggressive. A physical, manual kill switch for the heating element is a must on any roaster where there is any chance of air flow failure regardless of software hi limit controls. Many have had good luck with their electronics keeping the roaster safe but there always seems to be that 1 out of X that destroys the whole works. 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
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| jkoll42 |
Posted on 09/27/2020 8:58 AM
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 1 1/2 Pounder  Posts: 859 Joined: February 14, 2011 |
Quote allenb wrote: Quote I currently rely on the relay to be my on/off switch and leave the AC plugged into the machine. As long as the USB is disconnected, it "should" stay disabled. I feel like a physical switch could add another level of safety and also a physical "kill" switch if the controller get's a bit too aggressive. A physical, manual kill switch for the heating element is a must on any roaster where there is any chance of air flow failure regardless of software hi limit controls. Many have had good luck with their electronics keeping the roaster safe but there always seems to be that 1 out of X that destroys the whole works. I'll second Allen on this. If you can run an inline switch to the element only it would keep airflow but the easiest is just to run the entire setup off a power strip that has an on/off switch assuming you are under a standard wall outlet load like 15A in the US. Also with any roast setup keep a fire extinguisher close. It doesn't even have to be a large canister although that's what I keep around for my gas setup. -Jon
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3 |
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| cdrake39 |
Posted on 09/27/2020 11:20 AM
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1/4 Pounder Posts: 76 Joined: August 08, 2019 |
Greatly appreciate the feedback everyone! I will add in the kill switch (and use a power bar with a switch in the meantime) and keep a small extinguisher on hand just in case. Would you say there are any issues with how the hot/neutral wires for the heating element are run through the DC PSU? The AC Main wires split when they come in (using a T Tap splice), one end going to the DC PSU and the other end going to the heating element. I assume the DC PSU won't see any loads higher than what the blower motor connected to it is drawing? (ie 200W). The white dots represent where the AC Mains are connected |
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| jkoll42 |
Posted on 09/28/2020 6:29 AM
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1 1/2 Pounder Posts: 859 Joined: February 14, 2011 |
Quote cdrake39 wrote: Greatly appreciate the feedback everyone! I will add in the kill switch (and use a power bar with a switch in the meantime) and keep a small extinguisher on hand just in case. Would you say there are any issues with how the hot/neutral wires for the heating element are run through the DC PSU? The AC Main wires split when they come in (using a T Tap splice), one end going to the DC PSU and the other end going to the heating element. I assume the DC PSU won't see any loads higher than what the blower motor connected to it is drawing? (ie 200W). The white dots represent where the AC Mains are connected The only thing I see that I really don't like is the T splices. I would be OK with having them temporarily to verify everything is working correctly but inline splices tend to be unreliable and are not efficient. Soldering up a T splice is quite easy Jump to 6:29 for a T splice solder example -Jon
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3 |
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