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Thread: 1st ever home roast - whoops!

  1. #1
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    1st ever home roast - whoops!

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    So Ive just put together my KKTO yesterday and got to try out my very first home roast on some green Mexican Kassandra Organic care of the coffee braun. I have no idea what the cracks sound like, or what the beans are supposed to look like, but thankfully can tell when something isnt quite right *;)

    Cracking, smoking and brown. Looks about right I thought, so I pulled out the roast. The beans looked a bit light (about CS6-ish) but I figured it would be close enough. Upon closer inspection, they had a light mottled coating on them. Not sure what it was. I eventually weighed up some beans for a test shot. The beans were a bit heavy, somethings not quite right. Oh well, one way to find out. When a whitish-green grind came out, I knew Id possibly done something not quite right...

    I figured instead of chucking them, Id give it another go today. Another 10 minutes in the roaster, some more smoke, and the beans increased in size much more. When I stopped this roast, the beans looked more like normal roasted beans (albeit with a few dark ones throughout). Hooray! The density is right. Yay! And the grinds are brown. How novel! The taste test isnt exactly a roaring success, but its drinkable. Ill keep using it for the week and see how the flavour develops anyway. Im gonna enjoy this steep learning curve thing *:D




  2. #2
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    Re: 1st ever home roast - whoops!

    :D In time you will learn to thow them away. At least pick out the charcoal ones.

  3. #3
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    Re: 1st ever home roast - whoops!

    Hey Doug,

    In my experience, first crack starts around CS5-CS6 so I suspect you pulled the beans at first crack rather than ~second crack. Not to worry! Re-roasting was a good enough idea (better than chucking them!) but as you probably know, re-roasting will destroy most of the flavours you developed in the first roast...

    Now... I wonder why your beans appeared green inside after the first roast? You mentioned that your batch size was 625g green; were they being adequately mixed? There should be some videos of KKTO roasters so you can see how the agitation needs to look. As KK said when he nailed a 900g roast, agitation is the key to getting larger roasts right.

    Did you roast too quickly? Aim for ~10mins to FC - but of course the only way to know how to do this is to run it on full power for a roast and see what happens, then adjust from there! We dont usually get much smoke at FC - theres some, but not nearly as much as at SC - so this might suggest you got to FC too quickly??

    Anyway, great job on the roaster. It always takes a bit to get used to so dont be afraid to order an extra 2.5kg bag o beans next BeanBay to make up for the beans you *might* ruin before then! :P

    Good luck with it!
    Thanks for the photos - keep us updated on your next roasts./\/
    Cheers
    Stuart.

  4. #4
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    Re: 1st ever home roast - whoops!

    Second roast looks infinitely better :) Still not sure about the 1st and 2nd cracks, but about 18 minutes total roast time (I dropped my timer part way through and the batteries fell out, so its a bit of an estimate).

    All done in the one roasting too... :D




  5. #5
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    Re: 1st ever home roast - whoops!

    Its still looking a bit uneven. What do you think is causing it? Agitation needs some modification?

    First crack should be pretty obvious. Second can be harder to hear and sometimes you will finish the roast before you get there.

  6. #6
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    Re: 1st ever home roast - whoops!

    I turned up the heat a bit as I was worried it wasnt going to get hot enough, so i think Ill just run a load through on a lower, constant temp and see what happens from there. I just got 10kg of green, so Ive got enough for a few experiments...

  7. #7
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    Re: 1st ever home roast - whoops!

    Have you got a temperature probe? They are a great educational tool and should help with consistency and also varying power on the fly. Ideal temperature curves should slow a bit after first crack which helps with eveness.

    The fact that you have some beans that are burnt makes me think that there are dead spots in your agitation.

  8. #8
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    Re: 1st ever home roast - whoops!

    Will be getting a probe today as I can see it is going to help me a lot! Im pretty sure the centre of the agitation arm is the source of the dead spot, and am working on a cover to rectify it.

  9. #9
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    Re: 1st ever home roast - whoops!

    i have just done my first roast only 250 grams to start with then it happened husk started flying around the shed i heard my first crack. then they began to take colour is even medium to dark brown

  10. #10
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    Re: 1st ever home roast - whoops!

    Behmor Coffee Roaster
    I found that when i increased speed with agitation i got a more even roast.
    I put in a 5 stage speed dial control between the power supply and drill that lets me control it a bit better according to the batch size i am roasting.
    I use an old cordless metal chuck drill is my choice of device locked on and soldered it to a regulated 12v 1.5 amp power supply.




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