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Homeroasters - Home Roasting Coffee Community » THE ART OF ROASTING COFFEE » Roasting Profiles

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Amplifying Sound of FC
oldgrumpus	#1 Posted on 12/30/2022 3:31 PM
1/4 Pounder Posts: 168 Joined: July 25, 2012	Not sure if this is the right forum for this, but since detecting FC is related to roast profiles, I thought it a good bet. I've looked all over the forum for ideas to help more easily hearing first crack. My roaster, although relatively quiet for a drum roaster is still not easy to accurately hear first crack. I've seen a lot of ideas about using electronically generated visual graphs, but for me, I'm looking for something that doesn't require my eyes to be diverted from other important things, especially so close to the end of the roast and watching percentages and temperature... yada, yada... It seems like it might be possible to use something like a megaphone (visualize the old person with the horn in their ear and yelling, "Eh?....Eh??") Might it be possible to install a cone through a hole in the front plate of the roaster with the big end outside? If so, maybe it needs something to prevent air from being pulled in, like a fabric or similar. Or maybe a stethoscope? A high temperature transducer or microphone and a small amplifier-speaker? Please tell me your ideas! Nothing complicated please... Clever Coffee Dripper Grinder: Macap M4 Roaster: Completed drum roaster project photos shown here: Photos https://goo.gl/ph...Da6K4wfqw5 Videos https://www.youtu...Bd1NrdpSUH


CK	#2 Posted on 12/30/2022 4:41 PM
1/2 Pounder Posts: 231 Joined: December 07, 2018	On both of my machine builds I've used aluminum foil stretched smooth over a custom opening (like a pipe for example) and held in place with a stretchy high-temperature silicone gasket. First crack sounds can pass through the foil nicely. In your case, maybe a custom lid for your greens hopper with aluminum foil sandwiched between 2 layers of wood or other material. Its shape is kind of the megaphone idea you mention. You'd need to leave your metal charge gate open for the sounds to reach the foil for sound transmission, but it could be worth a try. Not sure if that would affect chaff flow too much or not... Before fabricating something you could just lay some foil over the hopper and wrap the edges temporarily to test if it works in your case. Technivorm Moccamaster, French Press, Aeropress GO, Ibrik, Moka pot, Breville Barista Express, Urbanic070s/static-free with zero retention mods, Breville SGP, Roaster908


oldgrumpus	#3 Posted on 12/30/2022 6:14 PM
1/4 Pounder Posts: 168 Joined: July 25, 2012	You’ve given me some good direction! Probably try foil replacing glass in the dump door just to test. I like the foil idea. Will see if getting it closer to the beans is a good idea or not. Thanks! Clever Coffee Dripper Grinder: Macap M4 Roaster: Completed drum roaster project photos shown here: Photos https://goo.gl/ph...Da6K4wfqw5 Videos https://www.youtu...Bd1NrdpSUH


CK	#4 Posted on 12/31/2022 8:44 AM
1/2 Pounder Posts: 231 Joined: December 07, 2018	Quote oldgrumpus wrote:Probably try foil replacing glass in the dump door just to test. I like the foil idea. Will see if getting it closer to the beans is a good idea Replacing the glass would work perfectly. Good idea. I suggest using some type of wire mesh on the bean side with foil next to it on the outside. That way the foil won't tear. Technivorm Moccamaster, French Press, Aeropress GO, Ibrik, Moka pot, Breville Barista Express, Urbanic070s/static-free with zero retention mods, Breville SGP, Roaster908


Microfiche	#5 Posted on 01/04/2023 4:20 PM
Newbie Posts: 18 Joined: November 27, 2022	I would love any info or links on this as well. I only have hearing on one side, and it is quite poor, aided with a hearing aid. In my 18 roasts so far with my SR800, I have been able to hear first crack maybe 30% of the time? Never heard a second crack so far, though I am pretty sure I have hit it a few times, based on roast colour. I have seen a few projects like this one https://www.home-...43169.html, but none of them seem current or maintained. Retired, newbie roaster, long time coffee lover, with Phidget connected thermocouples in SR800


oldgrumpus	#6 Posted on 01/04/2023 6:09 PM
1/4 Pounder Posts: 168 Joined: July 25, 2012	I like the idea just posted above having Artisan “learn”, yet at the same time, I feel like I personally would like to rely less on electronic solutions. I’m almost 70 y/o, and find some romantic notions of the craft very satisfying. Sorry about the philosophical treatise 🙄. I’ll be roasting soon with the foil experiment and if successful, I’ll develop a more unique integration onto the roaster. 🤔 Clever Coffee Dripper Grinder: Macap M4 Roaster: Completed drum roaster project photos shown here: Photos https://goo.gl/ph...Da6K4wfqw5 Videos https://www.youtu...Bd1NrdpSUH


renatoa	#7 Posted on 01/05/2023 3:20 AM
Administrator Posts: 2507 Joined: September 30, 2016	Similar subject thread below, with some solutions. https://homeroast...ad_id=6431


oldgrumpus	#8 Posted on 03/03/2023 2:41 PM
1/4 Pounder Posts: 168 Joined: July 25, 2012	I posted a short video with my solution. Please forgive the corny thumbnail... Clever Coffee Dripper Grinder: Macap M4 Roaster: Completed drum roaster project photos shown here: Photos https://goo.gl/ph...Da6K4wfqw5 Videos https://www.youtu...Bd1NrdpSUH


CK	#9 Posted on 03/03/2023 4:10 PM
1/2 Pounder Posts: 231 Joined: December 07, 2018	Nicely done! Innovative, low-tech, yet highly effective solution. Might have to copy your work for better 1C detection on my roaster. At the same time I'm hoping to integrate a water quench feature through the horn... to be continued. Thanks for posting. Technivorm Moccamaster, French Press, Aeropress GO, Ibrik, Moka pot, Breville Barista Express, Urbanic070s/static-free with zero retention mods, Breville SGP, Roaster908

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