Raost

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TheBean
Posts: 13
Joined: Sun 08 Aug, 2021 2:40 pm

Re: Raost

#2140

Post by TheBean » Sat 28 Aug, 2021 11:10 am

nrdlnd wrote:
Sat 28 Aug, 2021 5:40 am
Hi The Bean,

Damians D-profiles are very good but require a high voltage supply. I have tried the D-Light with good results when Iv'e had enough voltage even if it has been near the limits but some times not and with lesser result. I think the D-Raost is built on the D-profiles.
I’ve tried D-Roast, D-Raost and D-Raost v2, and all of them give me “low voltage” warning - Looks like these profiles made for high voltage users. Not sure how to tweak the profile to fix this issue. Is there an easy way to adjust the profile for lower voltage?

Geronimo
Posts: 135
Joined: Mon 03 Jun, 2019 11:10 am
x 15

Re: Raost

#2141

Post by Geronimo » Sat 28 Aug, 2021 4:41 pm

TheBean wrote:
Sat 28 Aug, 2021 11:10 am
nrdlnd wrote:
Sat 28 Aug, 2021 5:40 am
Hi The Bean,

Damians D-profiles are very good but require a high voltage supply. I have tried the D-Light with good results when Iv'e had enough voltage even if it has been near the limits but some times not and with lesser result. I think the D-Raost is built on the D-profiles.
I’ve tried D-Roast, D-Raost and D-Raost v2, and all of them give me “low voltage” warning - Looks like these profiles made for high voltage users. Not sure how to tweak the profile to fix this issue. Is there an easy way to adjust the profile for lower voltage?
Greetings

The best way, whether right or wrong is to tapper off your fan profile to reduce the speed in the later part of roast. I’m sure Damian said with initial post for profile, that the fan speed is good to drive thru first crack, so try and reduce after FC to get your power down somewhat.

Cheers
G

benjaminfleon
Posts: 23
Joined: Wed 28 Apr, 2021 5:02 am
Location: Santiago, Chile
x 15

Re: Raost

#2151

Post by benjaminfleon » Tue 07 Sep, 2021 4:42 am

Hey everyone! Sorry the late response! I've been launching a micro-roastery for the past few weeks, so not as much free time as I'd like to have...

TheBean wrote:
Fri 27 Aug, 2021 10:59 am

Hi @benjaminfleon, I’ve tried yours D-Raost V2 and whilst I have the same voltage as yours, I still received the “low voltage” message - is it normal? Cheers.

I sometimes get that message, but doesn't seem to have any negative effect; at least with the D-Raost versions after V1. This could very well be due to my batch size (80 grams), which I would presume is easier to keep on the curve for the PID at that voltage, so I can't say for bigger batches.

All my profiles are designed for 80 gram batches (with the exception of the mini versions, which state their batch size specifically).

Right now I've been mostly roasting with the last version of the D-Raost and tweaking it for each specific coffee's behaviour. It's been a pretty good benchmark.

Regarding the last version of the Raost profile, it's definitely meant for faster and lighter roasts, which not all coffees are necessarily well suited for. Coffees that are not super consistent in their density/size, like blends from cooperatives or regions, instead of single-variety lots; as well as lower altitude coffees might do a lot better with profiles like Slow Raost.

benjaminfleon
Posts: 23
Joined: Wed 28 Apr, 2021 5:02 am
Location: Santiago, Chile
x 15

Re: Raost

#2153

Post by benjaminfleon » Tue 07 Sep, 2021 5:09 am

Also, just wanted to show you a couple of logs!

I recently launched my micro-roastery here in Chile; it's called King Solomon Micro Roasters (@kingsolomoncoffee in instagram, if anybody wants to check it out).

I used slightly modified versions of D-Raost and Raost to roast a bunch of Geshas from NinetyPlus. All 80 gram batches, rehydrated up to 16% moisture.

This is one called Kemgin, modified D-Raost.
kemgin.png
kemgin.png (140.03 KiB) Viewed 315 times
This one is Juliette, modified D-Raost.
juliette.png
juliette.png (130.29 KiB) Viewed 315 times
And for one called Kambera, which is a heavilly fermented gesha, I opted for a slightly modified Raost:
kambera.png
kambera.png (123.2 KiB) Viewed 315 times
That last one was the most challenging to roast, as it was very delicate, and also took up heat super easily.

nsolling
Posts: 7
Joined: Tue 03 Aug, 2021 6:11 am
x 3

Re: Raost

#2157

Post by nsolling » Tue 07 Sep, 2021 11:40 pm

Hi Benjamin,
Having been following this thread very closely it is nice to see some of your roast results.
Can you comment on the modifications you are making and why? Is it possible to post the logs apart from just the screen capture?

I am still trying to get my head around of the whole bost stuff, why we do it and when to do it and the theory behind the flat fan curve around FC

Good luck om the Micro roastery. Will you roast on the Nano only? Cool jars

nrdlnd
Posts: 109
Joined: Sun 21 Jun, 2020 12:00 pm
Location: Sweden
x 30

Re: Raost

#2215

Post by nrdlnd » Sat 02 Oct, 2021 10:37 pm

Hi all!
I made some modifications on the RaostV4 and I called it RaostV4PNmod. Now I roasted 100g Sidamo Bio washed bean. It didn't go so well on paper. I got a dip during FC and a flick when the beans became exothermic. Originally in the profile there are a power zone during FC (as in the original RaostV4). Apparently it is necessary to have the PID in this phase and I replaced the power zone with a positive boost during FC. This is the log:
100gSidamoBio_RaostV4PNmod-P.png
100gSidamoBio_RaostV4PNmod-P.png (62.62 KiB) Viewed 154 times
My intention was to go for a DTR around 20% but it stopped at L=2.5 by itself at 15% DTR and a temp 215.1 deg C. It became a light roast that looks ok and is evenly roasted. It was a fast roast at 5:40. I think it's quite possible to go higher in both temp and DTR if you like it a little darker. Maybe up to L=3.0? ROR looks very nice this time.
I think this profile suits light roasts of high altitude hard washed beans especially well. It has not so high demands on voltage.

I attach the modified profile:
RaostV4PNmod-P.kpro
(2.33 KiB) Downloaded 14 times
And a picture of the beans (they are lighter in reality):
Sidamo_Bio_211002.JPG
Sidamo_Bio_211002.JPG (67.73 KiB) Viewed 149 times

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