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Corretto can't hear cracks?

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  • ax72
    replied
    The noise of the fan/heat-gun and any other running motors (e.g. motor to turn a drum) would typically be of a constant and fairly limited frequency spectrum. In contrast, the cracking sounds would be of a broad spectrum. Therefore I would expect that applying sound insulation that is targetted for the frequencies of the fans/motors while allowing cracking sounds to be emitted by the contraption, may be the idea. This is only a theoretical opinion, mind you, as I'm currently roasting beans on a cast iron wok and I am only designing my heat-gun based roaster at this stage.

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  • DesigningByCoffee
    replied
    Originally posted by mitt View Post
    He he. You've resurrected an old post from a couple of months ago. Thought I'd reply for anybody who has the same problem in future.

    Well since my last post I ended up building/bending a narrower (square) pan out of aluminium sheeting to allow the single agitator to work better. With a few more attempts I figured out 2nd crack was clearly audible for most beans but 1st not at all.
    Hi Mitt
    That's an unusual situation - most often it is hearing 2C that most roasters struggle with But easy to see why - a lot of roasters never roast to 2C anyway…


    Originally posted by mitt View Post
    Chaffing was probably the only rough indication I was there. Probably an experience thing.
    Boxer shorts while roasting help

    Originally posted by mitt View Post
    I ended up getting a temp probe to help me stretch the time between 1st and 2nd. At least now I can guess when to back off the heat at first crack by the approx temperature even without hearing it.
    Second that entirely - the DMM and temp are by far the best way to log your roasts - glad it is working well for you
    Happy roasting!

    Matt

    Leave a comment:


  • mitt
    replied
    He he. You've resurrected an old post from a couple of months ago. Thought I'd reply for anybody who has the same problem in future.

    Well since my last post I ended up building/bending a narrower (square) pan out of aluminium sheeting to allow the single agitator to work better. With a few more attempts I figured out 2nd crack was clearly audible for most beans but 1st not at all. Chaffing was probably the only rough indication I was there. Probably an experience thing.

    I ended up getting a temp probe to help me stretch the time between 1st and 2nd. At least now I can guess when to back off the heat at first crack by the approx temperature even without hearing it.

    Adding 50g more beans didn't do it for me. Might try 400-500g soon but really don't go through enough in a week to justify that.

    I've found it much more satisfying and easy knowing where I am roasting up to and that the roast is good despite how I think it doesn't look right. Stopped me getting worried about underroasting.

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  • RobertHolmes
    replied
    G'day Tim. Is the Ozito fan-speed adjustable, or just the temp? If you can slow the fan before you expect FC you might have a better chance of hearing them. I agree with the others who say charging with more beans, & insulating the pan, should both make the roast quieter.
    Last edited by RobertHolmes; 5 December 2013, 07:54 PM. Reason: typo

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  • DesigningByCoffee
    replied
    Hi Mitt
    Seems counter-intuitive - but putting a lid over the pan (and insulating as steve said) actually makes hearing the cracks easier! Seems to reduce the road noise of the beans.
    But the aggresiveness of the cracks can also have something to do with your roast profile - if you start slow and ramp temp to 1C, you tend to get loader cracks (but not a deal breaker taste-wise by any stretch!)
    But keep persisting - with a bit of corretto pimping, great results are not far away

    BTW - are you using a probe & Multimeter? I find that the temps are more important than the cracks as reference points at the end of the day

    Matt

    Leave a comment:


  • Steve82
    replied
    I find exactly the same thing when using coretto, also have quite bad tinnitus.

    I found that's after I insulated bread pan with fire blanket, It made things a lot more quiet, easier to hear the very faint early cracking/ snapping

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  • mitt
    replied
    Hmm. Ok. I may have to try 500g batch then. I also attempted to reduce the size of my roaster container with foil, cardboard and electrical tape but that failed miserably...

    The BM is open and I'm using an Ozito adjustable heat gun. The heat gun is not espeically loud - more the beans rumbling around that stops me hearing the cracks or just hearing them very faintly.

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  • sidewayss
    replied
    Hi Tim,

    I presume you are using an open coretto? Meaning the lid has been removed and you are roasting minus the lid and you can see the beans?

    I use a lid on mine and I can still hear the beans on first and second crack.

    Definitely try and do a 500gm load and see. With a small batch the beans bouncing around the pan does make it noisier.

    More beans will not bounce as much and will tend to go in a stirring fashion, thus enabling you to hear it better.

    More beans in a rectangular pan will also help push each other and lessen dead spots as you referred to.

    Sounds strange but larger loads are more controllable IMO.

    Is your heatgun pretty loud?

    With more roasts under your belt it will get easier as you learn and adjust.

    Leave a comment:


  • Dimal
    replied
    Yeah, it's a weird one mate....

    Same thing when I was roasting in a Behmor a while ago. Had to sit back a couple of metres away and I could hear everything just fine. I've got pretty severe tinnitus too so maybe that has something to do with it...

    Mal.
    Last edited by Dimal; 12 October 2013, 12:49 AM.

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  • Yelta
    replied
    Originally posted by Dimal View Post
    Actually, I've found it far easier to just stand back a bit from the roaster; the cracks are much more audible then...

    Mal.
    Interesting Mal, once I set the roast in motion I move over to my work bench, approx 3 meters away, I hear the cracks from there with no problem, but then I also hear them when standing next to the setup.

    Leave a comment:


  • LindaD
    replied
    Mitt,

    There is a thread on Corretto batches, maybe some help here for you:

    http://coffeesnobs.com.au/home-roast...justments.html

    -Linda

    Leave a comment:


  • Dimal
    replied
    Actually, I've found it far easier to just stand back a bit from the roaster; the cracks are much more audible then... Also come from a heavy engineering/industrial/mining background so my hearing isn't too flash either....

    Mal.

    Leave a comment:


  • LindaD
    replied
    Hi Mitt!

    There are some beans that when they start FC are extremely hard to hear. I can imagine with the heat gun going and the beater in the BM mixing the beans.

    I have watched beans being cooked in it, and I can understand your frustration.

    Maybe some of our fellow CS'rs can give you some advice, on what to look for?

    I cook in a Gene Café, and my cracks are very audible.

    Good luck!

    -Linda

    Leave a comment:


  • Yelta
    replied
    Evening Tim,
    I'm using a Breville single loaf BM with a Bosch heat gun, I roast batches of 725 grams and have no problem with hearing both 1st and second crack, btw my hearing is not real flash, years operating machinery and shooting.

    Perhaps a larger bean load will quieten things down a bit.

    Leave a comment:


  • mitt
    started a topic Corretto can't hear cracks?

    Corretto can't hear cracks?

    Hi all

    So I tried roasting in my breadmaker with my heat gun and am having real difficulty hearing the cracks. All the clunking from the beans hitting the sides seems to drown out the cracks for me. I can just go by colour but I want to dump it all as I hear the start of seconnd crack.

    I have just gone back to manual stirring the beans with the air from the heat gun in a large mixing bowl which allows me to hear everything clearly.

    I am new to this roasting business and not hearing anything is a pretty big deal breaker it seems. I started with 250g and went up to 300g to see if increasing the volume a little would help to no avail.

    Also, any problems with dead spots inside a rectangular BM? Plenty of beans get stuck in the corners though this hasn't made any problems in roasting evenness from what I've attempted.

    Cheers
    Tim
    Last edited by mitt; 11 October 2013, 09:33 PM.
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