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Thread: Weird roast

  1. #1
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    Weird roast

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Completed my 5th roast tonight using Corretto. I can only describe it as "wierd" *:o. (Ugandan Bugisu AA). Im sure I started out with 504g but ended up with around 540g on digital scale. Must a weighing mistake? *:-?

    I didnt hear first crack at all and decided just to watch the color of the beans after the 12 or so minute mark and pull them out when close to CS 9ish. This didnt happen until 8 minutes later. Even at this stage I couldnt hear any sign of second crack. Odd....

    The other thing that was strange was that my multimeter was reading 42 degrees before I even turned on the heat gun. It went up to 210 at the peak of the roast, but it was only 30>31 degrees outside when I started. Quite humid though. I tried both my bead probe and new stick type probe and no difference in the reading. Any advise on any of the odd things above much appreciated!

    I must say though the roasted beans do look nice and even in color. As far as I can tell they look like CS 9 on my computer. Currently waiting for the new members card and should have it any day now with my new green bean order *:)

  2. #2
    Mal Dimal's Avatar
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    Re: Weird roast

    Gday Buschy,

    Have you tried your DMM/Thermo-probe in a saucepan of rapidly boiling water? At sea level, you should read very close to 100C. Its a quick check that should highlight any potential problems....

    Regarding your roast, theres a good chance that it may not have even reached First Crack due to the low DMM reading. If this is the case, theres probably not much hope for the Bugisu unfortunately. Give em a go after a few days rest and see how you go... might be lucky :-?

    Mal.

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    Re: Weird roast

    Hey Buschy,

    Weve had two roasts (including our 2nd ever roast) which never gave us a first crack but darkened adequately and eventually got to second crack. The common problem was taking it TOO slowly. Both roasts were ~25mins to SC. Both tasted ok (maybe a little flat, although when you expect something to taste crap, it probably will...). Your Bugisu will probably taste fine.

    If I were to diagnose your problem, Id say that the thermocouple issue probably put you off and you may have taken the roast too slowly. Is the thermocouple in the bean mass or on top of them? Ours sit on top of the beans, which makes it prone to inconsistency, but apart from that weve found that the most important thing is to get the thermocouple in a reproducible position so that your readings are consistent roast-to-roast. It doesnt really matter what readings you get for FC/SC as long as theyre consistent(ish) - say +/- 5ºC.

    Also, if youre halfway through a roast and the TC comes loose or starts giving strange readings, switch to roasting by colour and fix the TC for next roast! Some of our worst roasts have been caused by relying on the TC when it was giving weird readings...

    Cheers
    Stuart.

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    Re: Weird roast

    I tested the probe in boiling water and this confirmed that the DMM is 15 degrees off. I dont know what happened as it was fine last roast and its only been used a few times. I guess its not a big deal provided I keep the difference in mind.

    Stuartgrant, the probe is positioned just under the surface of the bean mass on the side of the breadmaker that the heat gun points down on. Taking the 15 degrees into account, the roast only reached 195 (after 20 minutes). I probably did have FC along the way but didnt hear it. I noticed some beans I have roasted crack really loud while others I have to stand right next to the BM the entire time to hear anything besides the beans spinning around. I didnt stand right next to it continuously with this roast, assuming I would at least hear something from where I was positioned. Nope.

    I decided to try a shot with the suspect beans. I know I probably should have left them but I was curious *::). I also munched on a couple.... They tasted neither nice or not nice, just kind of flat. Ill leave them in the vac bag for a few more days and give them another go. Thanks.


  5. #5
    Senior Member Dennis's Avatar
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    Re: Weird roast

    Just some thoughts...

    Use the DMM to give you an indication of the degree of temp ramping times - dont get to hung up on what temp FC and second crack occur. *Apart from knowing what is happening, use it as a tool to predict what will happen, and when its likely to occur. *Knowing when your close to FC will of course allow you to understand when to back off the heat and coast to second crack.

    IMHO, anything over 20 mins is probably going to stand a good chance of tasting baked and flat rather than roasted.

    Finally, DO stand next to your roast - walking away can be fraught with danger.

    Hope that helps!




  6. #6
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    Re: Weird roast

    Nothing useful to add - just sick of the typo in the topic title.

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    Mal Dimal's Avatar
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    Re: Weird roast

    Quote Originally Posted by fatboy link=1227179199/0#5 date=1227330408
    Nothing useful to add - just sick of the typo in the topic title.
    ;D ;D

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    Re: Weird roast

    Ooops.... *:-[

    Fixed *:)

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    Sleep is overrated Thundergod's Avatar
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    Re: Weird roast

    Quote Originally Posted by Buschy link=1227179199/0#7 date=1227332007
    Ooops.... *:-[
    Fixed *:)
    Not actually.

    Maybe Mal or another mod will do the honours.

  10. #10
    Senior Member fatboy_1999's Avatar
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    Re: Weird roast

    Ive got a feeling that Chris went through and fixed it @ 4:39 and Buschy has gone and changed it back to the wrong spelling @ 4:43.
    Oh the fun we have!

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    Re: Weird roast

    Its all coming back to me.. "i before e except after c...." * * :D

  12. #12
    Senior Member fatboy_1999's Avatar
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    Re: Weird roast

    And W

  13. #13
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    Re: Weird roast

    mod edited and fixed...again ::)

    I beleive its all right now ;)

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    Re: Weird roast

    Admit defeat. :P. I "beleive" Ive sorted it all out and on the right track again. Wife is just shaking her head.... ;D

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    Re: Weird roast

    Quote Originally Posted by Buschy link=1227179199/0#13 date=1227339594
    Admit defeat. :P. I "beleive" Ive sorted it all out and on the right track again. Wife is just shaking her head.... *;D
    I believe that you might be wrong there ;D

  16. #16
    Sleep is overrated Thundergod's Avatar
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    Re: Weird roast

    Wife is perceptive.

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    Re: Weird roast

    Thanks for the tips Dennis, much appreciated. Yes, I guess with each type of bean temps for FC, SC, etc. can vary quite dramatically and each roast is a new adventure. Now that my DMM is a bit stuffed Ive just placed a new bigger and better one with logging capability on my Christmas list so I can plot some charts after roasting.

    I do, usually quite diligently *:) , stand next to the BM (it’s down below resting on the deck tiles) while roasting and watch the beans go round and round…and round..., but perhaps with this roast the cracking sounds were so subtle I would have had to place my ear right next to the beans. Ouch ... * * Or, FC just didnt happen??

    I, too, start to get a bit worried when the beans are still in the basket at the 20 minute mark. Ive just adapted my heat gun stand so it will be easier to raise and lower while roasting. The way I had it set up before it came to rest on the BM at a certain level and couldnt be lowered any further. Fine for some beans, obviously not good enough for others. Cheers.


    Quote Originally Posted by Dennis link=1227179199/0#4 date=1227329891
    Just some thoughts...

    Use the DMM to give you an indication of the degree of temp ramping times - dont get to hung up on what temp FC and second crack occur. *Apart from knowing what is happening, use it as a tool to predict what will happen, and when its likely to occur. *Knowing when your close to FC will of course allow you to understand when to back off the heat and coast to second crack.

    IMHO, anything over 20 mins is probably going to stand a good chance of tasting baked and flat rather than roasted.

    Finally, DO stand next to your roast - walking away can be fraught with danger.

    Hope that helps!



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    Re: Weird roast

    This thread prompted me to check my DMM and probes

    10 degrees out. Both probes read 90 in boiling water so Im gunna take the DMM back to Jaycar and exchange it for a different, and hopefully better model.

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    Re: Weird roast

    Quote Originally Posted by gronk62 link=1227179199/0#17 date=1227420975
    This thread prompted me to check my DMM and probes

    10 degrees out. Both probes read 90 in boiling water so Im gunna take the DMM back to Jaycar and exchange it for a different, and hopefully better model.
    What altitude is it where you live G62?

    Mal.

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    Re: Weird roast

    Quote Originally Posted by Mal link=1227179199/0#18 date=1227443439
    Quote Originally Posted by gronk62 link=1227179199/0#17 date=1227420975
    This thread prompted me to check my DMM and probes

    10 degrees out. Both probes read 90 in boiling water so Im gunna take the DMM back to Jaycar and exchange it for a different, and hopefully better model.
    What altitude is it where you live G62?

    Mal.

    Gday Mal.

    Umm I tried to find a "stunned mullet" smiley coz I dunno what my altitude is.

    I live in West Gippsland near Warragul, Victoria. About the same level as the Princess highway :)

  21. #21
    CoffeeSnobs Owner Andy's Avatar
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    Re: Weird roast


    Was the water still boling when you tested it?
    (or did you pour boiling water from the jug into a cup to test)

    I would guess that most cheap meters are rated at +/-10% so 90C. is still about right.

    Accurate scientific equipment will cost you alf a grand or more so as long as it always reads a similar number I dont think it should be too big an issue for roast monitoring.


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    Re: Weird roast

    Behmor Coffee Roaster
    Quote Originally Posted by Andy Freeman link=1227179199/20#20 date=1227443887
    Was the water still boling when you tested it?
    (or did you pour boiling water from the jug into a cup to test)

    It was boiling flat out and I needed to wear a rubber glove to protect my skin from the steam while I held the probes in the water.

    Its a pretty crappy DMM so I never expected it to be super accurate, but I didnt think it would be out by that much. I wonder how far out it is at the higher temps during a roast



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