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Mr Karlsen

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About Mr Karlsen

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    Lightly Roasted

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    Denmark
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    Student

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  1. My wall got an upgrade! I'm still working on the proper placement of all the stuff, but it is quite amazing to have a large dedicated coffee space (and pretty stoked my girlfriend let me do this).
  2. I thought I would give an update as I have done a lot more roasting over the past weeks. I'd been roasting 3 different coffees, but still had huge problems with scorching and being unable to identify 1st crack. Recently, I tried to go back and try an approach, which was also suggested in this thread (when I had tried it earlier on, I wasn't quite successful). I wanted to try the approach where I kind of dry out the beans at a lower temp for some time. So I let the temp rise quickly to about 140ish, and then turned on the dimmer and tried to keep the temp around 150c until I hit minute 6 (from start of the roast). Then switched the dimmer off, until I reached 1st crack and then turned the dimmer on again and set the wattage to around 1050w, until I ended the roast. It turned out that this approach was highly successful for me. The beans got A LOT less scorching, developed much more evenly and I am now also able to identify 1st crack much more clearly (this might be due to more roasting experience though). It has improved the taste of my coffee, as I now don't either burn, underdevelop or bake my coffee as much. So, thanks for all the input in this thread. I feel I have taken my roasting game one tiny step forward.
  3. It does help a little, heh, I just need to keep at it then! Try some things out and will try some other beans too. Won't be able to roast again before the weekend, but will give an update when I have news. But yeah, still got problems hearing first crack. Sometimes hearing a few loud cracks which I assume is the start, and then I do hear a little bit after - but I think it is difficult to determine whether it is the cracks or not and for how long it goes on etc.
  4. No pre-heating, I cool in Gene down to 100c and cool down externally until beans are not hot. Beans are really only in the drum, when the machine is running.
  5. I will give this a go. Sometime next week, I should receive some new greens and then I will see how they behave!
  6. Hey Rob, thanks again for all the input - really helps a lot. Very good point about the steady temp. Something to think about there. I think one of my (other) main issues besides the burning, is that I really struggle hearing first crack. I seem to only be able to hear it, when I roast up to about 230c and then I may only hear like 5 loud single cracks. I've been using a tube, placed either on the exhaust or closer to the drum and it does not help me at all.. Of course this limits me greatly, as then I am really just roasting based on the color and that does me no good at the moment. Here are some more pics, of one of the roast I did 2 days ago - I just cupped these and this roasted tasted the 'best'. But still has quite a lot of a charry taste to it.
  7. There seems to be no problem with the chaff clearer, not a lot of build up there. There does seem to be some immatures amongst the beans, but I am not that great of a judge. I've now tried also roasting different batch sizes, 230g, 200g and it makes no difference on the appearance at all. Wattage is around 1270 when dimmer is off. And I bring it down to around 1150 to keep the temp steady. If my roasts hit 230c max, or 220c max seems to make no difference on the burning/schorching issue.
  8. You pretty much boiled it down here, what the problems are.. Here are pictures of the greens Im using: I really only know how to look for the more visible defects - so I would have no clue what to be looking for with the beans. Got a brand new roaster, with the large chaff collector and no extra ducting. It is standing on top of my stovetop, so there shouldnt be any blocking there.
  9. That sounds like a good roast! When you run at 1130w, how long does it take to get from 223c to first crack at 234c? And at what time was your first crack and end time? I have been really trying to pay attention, and see if the beans develop evenly during the roast. Some of the defects will look slightly burned quite early, but other than that the rest seem to develop quite evenly. For the one that didn't go over 220c, I kept the dimmer on from the start and ran with a lower wattage from the start (to see if the beans were getting too much heat in the beginning). I ran at about 1150w until I hit 219, which only happened after 13 minutes due to the lower wattage. I didn't note the wattage I lowered it to when it hit 219, but I think it was somewhere between 1050-1100. I didn't hear first crack on these, and due very slow rise in temp, I dropped at 15:50min.
  10. Right, so I successfully installed the dimmer and it works perfectly, and after fiddling with the wattage measurer this also works correctly and shows the right wattage (12-1300w when dimmer is off). I did 4 roasts tonight, and being able to have much greater control over the temp was really nice. However.. All of the roasts remain super uneven / burned.. Pretty much similar to the pics on the first page (and some even worse). I tried different things with each roast, for example; one roast did not go higher than 219c - still half burned. I even tried to E-dump one batch to see if the burning was occuring in connection with the cooldown - This did not help at all, lol. Will try cupping all 4 in a few days, but not expecting much based on the burning. Its quite frustrating I must admit. Could the bean be a cause? - It is a Colombian Supremo from Huila, and I have only been roasting this one bean so far. I will be getting some new greens soon to try this out. If you have any tips or things/profiles I could try to help mitigate this problem I would be greatful. Mr Karlsen
  11. Yes okay something must be up with the watt measurer.. Did a test (empty barrel). Started with dimmer Off and let the temp rise to 145 - reached after 1 minute. Then I brought in the dimmer, and brought the wattage down to 1300ish, and that caused the temp to fall. The sweet spot for keeping the temp steady was around 1600. The watt measurer does seem to be consistent, but for some reason shows higher than it should? So what should my approach be? Get a new watt measurer? Will that even help - it does seem to show correct measurements for other appliance if I test it there. And is it safe to run with what I got at the moment? I wont burn down the gene if the wattage the measurer shows are actually correct? Sorry for the many questions, I am not quite that skilled with my electronics. So thanks for trying to help me out!
  12. Update: I am pretty much done installing the dimmer mod, and just testing it right now - and it seems to work! At least when I switch on the dimmer I am able to control the wattage and I get no errors and the gene seems to run great. Good news. One question: When I have the dimmer 'off', the wattage is steadying around 2300ish. Is this the normal range when a dimmer is not on? seems high to me? I did not check this before, and I am a complete electronics noob. I am in Denmark, where we have 230V and have the 230v version of the gene. - Mr Karlsen
  13. Kenya Kieni from The Coffee Collective - big fan of this one, really sweet and fruity! Brewed on the v60.
  14. Okay, so I did another roast. Voltage was extremely steady at 227v all the way through. I did not go higher than 230c - and I was not at 230c for a long time as I kept the roast around 220-226 for most of the roast. But still getting an uneven roast, with a lot of burning.. So I assume, that it is the switching on/off that could be causing the uneveness as well as burning? - I will be looking to do the dimmer mod now. If I have to mention something positive from my Gene-career so far, is that I have been able to keep it consistent! Consistently uneven and burned, but hey.
  15. Thanks everyone. So, I just ran 2 test roast with the voltage meter. Throughout both, it kept very steady at 227-229. I suppose this is a good thing? I will try again later, to check if I just got lucky. But I am still getting quite uneven roast eg. half the beans looks great, the other half looks somewhat burned. And I do get a char taste when I cup all of these. Will do a roast or two later tonight, with a lower temp - probably 230c? And I will post the results after.
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