D-Light

[nrdlnd]

Thank you very much!

I don't no how much these sharp variations matters as it mainly reflects what the temp probe reads and the reaction from the PID. I think it's possible to see that it affects the power curve (or the other way that the variations in the power curve affects the ROR curve). It may not have effect on the beans? You have changed your calibration and I wonder if that can give this effect? Was it Damians default D-Light profile or was it the mod I have made that you used for this roast?

I don't know if other settings can affect how the PID handles this. Maybe power zones? You can look at side 14 and 15 in the manual about power zones. This is anyway very interesting. I also found this link from the manual: https://kaffelogic.com/community/viewto ... t=36&p=163 with further tips.

Maybe Chris can help?

Your further exercises will be interesting to follow!

Cheers!

[Geronimo]

Thank you very much!

I don't no how much these sharp variations matters as it mainly reflects what the temp probe reads and the reaction from the PID. I think it's possible to see that it affects the power curve (or the other way that the variations in the power curve affects the ROR curve). It may not have effect on the beans? You have changed your calibration and I wonder if that can give this effect? Was it Damians default D-Light profile or was it the mod I have made that you used for this roast?

I don't know if other settings can affect how the PID handles this. Maybe power zones? You can look at side 14 and 15 in the manual about power zones. This is anyway very interesting. I also found this link from the manual: https://kaffelogic.com/community/viewto ... t=36&p=163 with further tips.

Maybe Chris can help?

Your further exercises will be interesting to follow!

Cheers!

Hi

Thanks again for more info. Just quick reply on the profile used. I have used the D-Light initially as just a test run with left over Peru beans, but with a fan calibration of 0.90, which in hindsight a little conservative as had plenty of power to spare. I’ll try your modified profile with the proper fan speed along with D-Light with reduced calibrated fan speed for comparison in the coming week or so. Still got a reasonable stash to work through.

Cheers
G

[nrdlnd]

My fan calibration is the default 0.97 from when I got the machine. Your was calibrated down to 0.90. In the advices: "If roasting is uneven fan speed calibration might need to be increased.". Can this explain the uneven ROR and power curves that can be seen when they aren't smoothed?
Your highest power was 1.24 and mine around 1.37. Sometimes it has been even higher but not as high as with the original D-Light.
I'm learning a lot from this!
Cheers!

[Geronimo]

My fan calibration is the default 0.97 from when I got the machine. Your was calibrated down to 0.90. In the advices: "If roasting is uneven fan speed calibration might need to be increased.". Can this explain the uneven ROR and power curves that can be seen when they aren't smoothed?
Your highest power was 1.24 and mine around 1.37. Sometimes it has been even higher but not as high as with the original D-Light.
I'm learning a lot from this!
Cheers!

Hi

My fan calibration is normally 0.96, but in hind sight I could have got away with leaving it at 0.96 for the D-Light roast, as the power supply was as high as I've ever seen it, and it could have been due to many people already in our area being on holiday, and not using power, which is probably the case as the shops near us have not been as busy for this time of the year.

Interesting question posed on the ROR and power curves. I don't know the answer, and hopefully someone else could help answer this.

Cheers
G

[nrdlnd]

Hi,
I don't know the answer either but it's the very rapid deviations that I haven't seen before. It's as if the PID has problems steering the power (or the regulating logic). I'm not sure it affects the taste though. Otherwise the mean of the curve is nice in your roast.
I made some roasts today mainly with some beans harvested 2019 and they must have been drier as they didn't behave as the more fresh beans that I have roasted before. The end weight became lower. The ror curves were still rather nice after fc but with more deviations before fc. The beans are not baked but maybe a little burned. I don't know how to avoid this but to try to have fresh beans. Store them in a refrigerator maybe if the humidity is higher there? I have stored fresh hazelnuts like that and they have kept very well.
Cheers

[Geronimo]

Hi,
I don't know the answer either but it's the very rapid deviations that I haven't seen before. It's as if the PID has problems steering the power (or the regulating logic). I'm not sure it affects the taste though. Otherwise the mean of the curve is nice in your roast.
I made some roasts today mainly with some beans harvested 2019 and they must have been drier as they didn't behave as the more fresh beans that I have roasted before. The end weight became lower. The ror curves were still rather nice after fc but with more deviations before fc. The beans are not baked but maybe a little burned. I don't know how to avoid this but to try to have fresh beans. Store them in a refrigerator maybe if the humidity is higher there? I have stored fresh hazelnuts like that and they have kept very well.
Cheers

Hi

I was looking for a very old post by Steve that may or may not be helpful for moisture content. He actually outlines the procedure but I can’t find it, I can find the link to his referenced website. It would be a bit hit and miss without a moisture meter, where you rinse a batch of beans in water, dry and leave in closed container overnight before roasting. Here’s the link: https://christopherferan.com/2020/02/18 ... o-a-sauna/

Also here is another bit of an interesting post by Steve. If you read Chris’s reply on 28th Nov 2019, with respect to a scary looking graph. The scaling is 10 in Steves graph.

https://kaffelogic.com/community/viewto ... b94223c22a

I’ve had a look at a few of other peoples logs when they have used power profiles (PID is disabled). The RoR scaled curve looks similar to when the PID is enabled.

More food for thought.

Cheers
G

[nrdlnd]

Hi,
Very interesting article about rehydrating raw beans before roast. You can get more taste but also less burning of the beans. In that article he also showed that the degrading of the beans were less (fatty acids) when stored under cooler and dry conditions. Not in a freezer but maybe in a refrigerator.

About power zones: I have tried a power zone when the power curve was irregular and it straightened the power curve and also the ror curve. I also have disabled a power zone from a profile in the middle of a roast and got a better ror curve. The PID-regulation was needed in that case. Once I found a power zone to be of benefit when at the end of a roast I saw the regulation struggle up and down trying to regulate the power. I don't think an irregular power curve (and ror curve) is a good thing during the sensitive developing phase after fc. Here is the example with the power zone: https://kaffelogic.com/community/viewto ... t=10#p2084
Cheers

[Geronimo]

Hi,
Very interesting article about rehydrating raw beans before roast. You can get more taste but also less burning of the beans. In that article he also showed that the degrading of the beans were less (fatty acids) when stored under cooler and dry conditions. Not in a freezer but maybe in a refrigerator.

About power zones: I have tried a power zone when the power curve was irregular and it straightened the power curve and also the ror curve. I also have disabled a power zone from a profile in the middle of a roast and got a better ror curve. The PID-regulation was needed in that case. Once I found a power zone to be of benefit when at the end of a roast I saw the regulation struggle up and down trying to regulate the power. I don't think an irregular power curve (and ror curve) is a good thing during the sensitive developing phase after fc. Here is the example with the power zone: https://kaffelogic.com/community/viewto ... t=10#p2084
Cheers

Hi

All I can say is that is very impressive work on your part, and achieving a relatively smooth RoR curve. Great work.

Looking at what you’ve achieved, I think I’m going to revisit power profiling and or zones, especially as I’m mainly roasting the same beans for my various blends.

One other thing, can you please tell me what your "RoR smoothing of logs" setting is? I'm currently 1 second.

Cheers
G

[nrdlnd]

All I can say is that is very impressive work on your part, and achieving a relatively smooth RoR curve. Great work.
Looking at what you’ve achieved, I think I’m going to revisit power profiling and or zones, especially as I’m mainly roasting the same beans for my various blends.

Yes please do! It's a lot of fun and please report back if it's something that you want to communicate! And thank you for your kind words! Well I don't know if it's impressive. What's impressive is the Kaffelogic software and all the possibilities with it and that it's rather uncomplicated and that it works. Working with zones is rather easy. Greater changes are more complicated and building a profile from scratch involves a lot more work. I have just scratched the surface this far.

A couple of tips: If you make changes of a profile and don't want to rename it don't forget to reload the profile in the machine. If the profile before the changes was loaded it will go on with the profile before the changes. I have made this mistake. If you modify a profile and want to give it a new name don't forget to rename it inside the profile in the "about" section. The machine reads this and there will be some confusion otherwise. If I want to keep the original profile before making changes I save it somewhere else on the computer and after the changes and renaming of the profile I put the original profile back on the USB-stick if I still want it there. It can be a mess to remember all what you have done. I try to document the changes in the profile but it had maybe been nice to have some kind of a protocol to document what you are doing. And it's possible to restore a profile from the log of a successful roast if you have missed to save it. It can also be a good idea to move profiles that you seldom use to another place on the computer.

It's very interesting to go through old logs and sometimes see new possibilities with profiles that you may have discarded because you didn't know how to make often simple changes.

One other thing, can you please tell me what your "RoR smoothing of logs" setting is? I'm currently 1 second.

I don't understand what you mean and you didn't understand what i wrote. Complete confusion. I think I simply referred to if you show the curve with a higher or lower resolution. I think X5 shows better whats happening. Lower X means that you are smoothing the curve. After I changed this I can look at my logs with new eyes.

So one more thing. Kaffeelogic Studio is supposed to backup files. I can't find that backup on my computer. Maybe I should contact support?
Cheers

[Geronimo]

I don't understand what you mean and you didn't understand what i wrote. Complete confusion. I think I simply referred to if you show the curve with a higher or lower resolution. I think X5 shows better whats happening. Lower X means that you are smoothing the curve. After I changed this I can look at my logs with new eyes.

Hi

I just typed a massive reply, but lost everything (arrrgh!!) as typing on an iPad and wanted me to relogin and it spat the dummy.

I’ll have to try and redo at some point.

In Options --> General options …, underneath where you change the ROR y-axis multiplier to 5, my ROR smoothing of logs (secs) = 1, can you please let me know what yours is set at. Just so we are comparing apples with apples.

Cheers
G