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 Coffee Roaster, All about the art of roasting coffee

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lowkl
post Nov 13 2017, 07:03 PM

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It's green bean restocking time! Anyone want to join to do a group buy?

NAME PROCESS
Brazil Cerrado Dulce 17/18 FC Natural
Brazil Extra Fine 17/18 Natural
Brazil Pulped Nat. Fazenda Pedra Redonda Pulped Natural
Brazil Sul de Minas, ICATU Natural
Brazil Sul de Minas, OBATA Natural
Brazil Yellow Bourbon Pulped Natural
Brazil Yellow Catuai Pulped Natural
Costa Rica Tarrazu San Rafael SHB Washed
Cuba Altura Lavado Washed
El Salvador Finca Santa Adelaida Washed
Ethiopia Djimmah Jasmine Washed
Ethiopia Sidamo Guji G2 Washed
Ethiopia Washed Yirgacheffe Gr. 1 Kochere Washed
Ethiopia Washed Yirgacheffe Gr. 2 Washed
Ethiopia Yirgacheffe Gr. 1 Nat. Gedeb Natural
Ethiopia Yirgacheffe Gr. 1 Nat. Kochere Natural
Guatemala Antigua Los Volcanes Washed
Guatemala Atitlán Santiago Washed
Guatemala Coban Washed
Guatemala Fancy Agua Tibia Estate Washed
Guatemala Fancy Huehuetenango Washed
Guatemala Finca El Retiro Washed
Guatemala Finca Joya Grande Washed
Guatemala Huehuetenango Finca Victoria Champila Washed
Guatemala Huehuetenango Finca Victoria Champila (Maragogype) Washed
Honduras San Jose Washed
Indonesia Kintamani Honey Honey
Indonesia Robusta Fine Natural
Indonesia Toraja Kalosi Washed Washed
Kenya AA Top Washed
Mexico Chiapas High Land Washed
Mexico SHG ORGANIC/FAIRTRADE Washed
Nepal Mount Everest Washed
Nicaragua Finca Los Granadillos Washed
Nicaragua Finca Un Regalo de Dios (Yellow Catuai) Honey (Black)
Nicaragua Maragogype Nueva Segovias Washed
Nicaragua Pacamara - La Bendición Washed
Puerto Rico 360 Reserva Washed
Santo Domingo Barahona Washed
Uganda Arabica Bukonzo Cooperative (Fairtrade & Organic) Washed
Uganda washed Robusta Washed


CONDITIONS:
- 3Kg minimum (can get a deeper discount if 20Kg or more)
- need at least 2 pax (including myself) to make it worth it
- If you are in the Klang Valley area, I don't mind dropping it off. Outside Klang Valley, have to cater for delivery (either courier or you arrange for a pickup)


PM me for details.

lowkl
post Nov 23 2017, 11:32 AM

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QUOTE(squallx840 @ Nov 23 2017, 11:01 AM)
Can you share the thermometer probe you used for the roaster?
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Not the same roaster, but just to share: I am very happy with the Mastech MS6514, which can be ordered from popular online shopping sites for under RM200. This is a dual probe standalone temperature meter, that can also record and quite easily interface with a PC so as & when you decide to automate your roast logging, the device is still useful. It is recognised natively by Artisan, and it has successfully interfaced to both my Ubuntu Linux notebook, and a Raspberry Pi 3.

The thermocouples provided were utter rubbish, so I replaced one with a 10cm long stainless steel version for the BT and another about 1cm stainless steel for the ET. I had to also order a some miniplugs and do some minor 'surgery' to change to this connector.


lowkl
post Nov 29 2017, 11:13 AM

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Since the discussion is now on temperature monitoring, allow me to share the thermocouple mods I've done on my Kaldi Wide roaster, to plug into the Mastech MS6514, which in turn plugs into my notebook (I explored a dedicated Raspberry Pi roast monitoring system, but found it too cumbersome).

I replaced the standard mechanical thermometer used to measure BT that came with the roaster with a 10cm K-type thermocouple by wedging it with a piece of silicone (cut from a baking glove) and some Kapton tape, like so:

Attached Image

Looking from the inside of the hopper holder (I keep the alignment with a small screw wedged next to the thermocouple):

Attached Image

I'm still fine-tuning the placement of this probe as I'm still getting a higher-than-expected 1C temperatures (around 205c, instead of 199c previously using the mechanical thermometer).

The ET thermocouple is wedged in like this:

Attached Image

Had to use a drill to enlarge the vent hole to accommodate the probe. I tried placing the probe directly in line with the heat source, just before the drum....bad move. Rapidly reached the limits of the thermocouple and got insane readings.

I also mentioned some surgery to use mini plugs compatible with the temperature meter:

Attached Image

lowkl
post Nov 29 2017, 02:43 PM

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QUOTE(ymeng85 @ Nov 29 2017, 02:20 PM)
Don't worry too much about a few C difference when changing probes. They will always have some delta from one to another.
Just offset it later on your software. Use first crack to help you nail down what is 200C reference point
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I never explored that on Artisan! Tq tq! Tweaking probe placement is a real pain as the gap is too tight for my chubby hands. ;-)
lowkl
post Nov 29 2017, 03:15 PM

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QUOTE(squallx840 @ Nov 24 2017, 05:02 PM)
Thanks for the input guys lowkl rytopa

Still new to the roasting terminology. Baru tahu what ET / BT / charge temp / means.
Currently watching video to learn more about the roasting process.

I am most probably going to manually monitor the temp manually before moving to roasting monitoring software. (after trial and error lol)
Btw, do share us the outcome of your DIY "surgery" on the thermometer probe, lowkl.
*
Looking forward to your sharing of your roasting experiences.

I must admit I learned a lot from logging the roast with pen, paper and a stopwatch, along with the thermometer. But would suggest you start exploring Artisan as well. It allows you to concentrate so much more on controlling the roast parameters instead of the logging. The software is free and quite easy to use, and with the MS6514 connecting up was also simple.
lowkl
post Dec 18 2017, 04:01 PM

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QUOTE(squallx840 @ Dec 18 2017, 03:38 PM)
I was thinking, does infrared gas stove suitable to be used as a heat source for the drum roaster?

Since I saw that the  Huky 500 are using one as well.

If yes, would it be OK if I use something like this:

http://www.butterfly1935.com/index.php/our...cts/item/bgc-10[attachmentid=9439381]
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I don't see why not. As long as the heater element is not too large (I would use the drum diameter as the gauge), then should be ok.

BTW this is the exact same stove I'm looking for my Kaldi Wide! The portable butane "camping" stove I'm currently using is convenient & generates enough heat, but the cost of those butane canisters are simply too high...adds over RM 1.50 per roast to my running costs. The only thing about these stoves is that I feel uncomfortable leaving a large gas canister outside the house. It seems smaller gas canisters are very hard to rent.
lowkl
post Dec 30 2017, 03:08 PM

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QUOTE(squallx840 @ Dec 30 2017, 02:01 PM)
DIY home roaster. Pretty interesting project.

http://www.instructables.com/id/How-to-Bui...ee-Roasting-Ma/

I believe the builder is from Malaysia.

lowkl check out the cooling tray in the link.

Maybe we can try build one ourselves biggrin.gif
https://forum.homeroasters.org/forum/viewth...?thread_id=5462
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Excellent links, squallx840! The cooling tray / chaff remover is indeed fascinating, especially the cyclonic configuration. Was exploring ready-made cyclonic components, but so far all are in plastic. Shouldn't be a problem, but ideally made from metal.
lowkl
post Jan 5 2018, 05:19 PM

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QUOTE(rianvaperknight @ Jan 5 2018, 03:24 PM)
I am a coffee lover all my life! I want these so bad.
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Are you interested to roast? The home/local roasting community is small but very inclusive.

Best way to experience something is....to experience it!
lowkl
post Jan 10 2018, 10:45 AM

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Let's talk a little about light roasts.... So far the lightest I've done successfully is around 15c above 1C. I feel uncomfortable doing anything lighter because 1C would be still going.

Any suggestions?
lowkl
post Jan 10 2018, 02:40 PM

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QUOTE(ymeng85 @ Jan 10 2018, 02:34 PM)
15C is interesting
My light roasts are around 5-6C above 1C
*
Wow! That's really light!

What is your RoR going into 1C?
What is your RoR on drop?
Roughly how long and % development (if you use this metric at all)
1C not over, right?
lowkl
post Nov 19 2018, 06:49 AM

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QUOTE(mshahrj @ Nov 18 2018, 11:51 PM)
nobody talks about coffee anymore?
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Nope....too busy roasting and brewing and drinking.

:-D


 

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