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Thread: I think I may have tipping issues with corretto roasts?

  1. #1
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    I think I may have tipping issues with corretto roasts?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Guys with my last couple of roasts I have had some beans that look like they have small chips in them in the middle of the bean. I am wondering if I have roasted them too hot or for too long? Perhaps my heat gun is too close

    They look nice and even inside.

    My profile is as follows

    Bean is Kenya Gitwe A

    Ambient temp 16

    1 min - 54
    2 min - 88
    3 min - 105
    4 min - 119
    5 min - 136
    6 min - 148
    7 min - 160
    8 min - 174
    9 min - 186
    10 min - 197 (First crack @ 10:20)
    11 min - 203
    12 min - 205
    13 min - 209
    14 min - 210
    15 min - 212
    16 min - 213 (First hints of SC) and roast pulled about 20 seconds later befor rolling SC

    I have attached a pic but I have played with the contrast to give you a better look at the bean.

    Any thoughts would be great.

    Cheers,

    Dean


  2. #2
    Senior Member Koffee_Kosmo's Avatar
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    Re: I think I may have tipping issues with corretto roasts?

    No thats not tipping
    That is caused by to high heat

    See this link for tipping
    http://www.bootcoffee.com/roastinghandbook1.html

    KK

  3. #3
    A_M
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    Re: I think I may have tipping issues with corretto roasts?

    Quote Originally Posted by 282B38382F264A0 link=1248002077/0#0 date=1248002077
    Guys with my last couple of roasts I have had some beans that look like they have small chips in them in the middle of the bean. *I am wondering if I have roasted them too hot or for too long? *Perhaps my heat gun is too close

    They look nice and even inside.

    My profile is as follows

    Bean is Kenya Gitwe A

    Ambient temp 16

    1 min - 54
    2 min - 88
    3 min - 105
    4 min - 119
    5 min - 136
    6 min - 148
    7 min - 160
    8 min - 174
    9 min - 186
    10 min - 197 (First crack @ 10:20)
    11 min - 203
    12 min - 205
    13 min - 209
    14 min - 210
    15 min - 212
    16 min - 213 (First hints of SC) and roast pulled about 20 seconds later befor rolling SC

    I have attached a pic but I have played with the contrast to give you a better look at the bean.

    Any thoughts would be great.

    Cheers,

    Dean

    Seen this before... And have experienced it :o with the Gene Cafe in particular..

    Others with experience may have a better way to manage it... But from what I experienced...

    Too hot too quickly and they get scorched / hot spots...

    Never seen it in my KK roaster or HT...

  4. #4
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    Re: I think I may have tipping issues with corretto roasts?

    Thanks KK, maybe my HG is too close to beans and the direct heat is getting to them?

    My temps dont look too high from my temp probe and first crack at 197 I think means the probe is reading ok

  5. #5
    A_M
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    Re: I think I may have tipping issues with corretto roasts?

    Quote Originally Posted by 42415252454C200 link=1248002077/3#3 date=1248005323
    Thanks KK, maybe my HG is too close to beans and the direct heat is getting to them? *

    My temps dont look too high from my temp probe and first crack at 197 I think means the probe is reading ok
    Yep... Over all temp may be OK, but the heat applied may be too direct and focused on the beans.

    It is almost like they burn on the inside and then pop to release the gas.

  6. #6
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    Re: I think I may have tipping issues with corretto roasts?

    I thought a few Small circular chips were a fairly normal indicator of second crack. I dont roast that deep too often bit find a few chips here and there when I do.

  7. #7
    A_M
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    Re: I think I may have tipping issues with corretto roasts?

    Quote Originally Posted by 5D4341454B574A4B4D452E0 link=1248002077/5#5 date=1248007314
    I thought a few Small circular chips were a fairly normal indicator of second crack. *I dont roast that deep too often bit find a few chips here and there when I do. *

    Ever see them on beans from Brown Bay or another professional roasted bean...

    As I said... Only ever seen them when too hot too quick.....

  8. #8
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    Re: I think I may have tipping issues with corretto roasts?

    Thats a divot from too high a temp. up to and into second crack, occurring during 2nd crack. Tipping will generally occur at start of roast from too high a charge temp. and is caused by conduction with a hot surface.

  9. #9
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    Re: I think I may have tipping issues with corretto roasts?

    Hmmm I tried to roast a bit darker than usual as Andys notes said that cocoa flavors develop with darker roasts of this bean.

    So should I be trying to slow the temps after FC and end the roast about 208 with my temp probe readings. Or just pull the beans when they start to get smokey just before second crack.

    Sorry for all of the questions, but I am on a steep learning curve with regards to roasting.

  10. #10
    Senior Member greenman's Avatar
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    Re: I think I may have tipping issues with corretto roasts?

    Hi Dean, your temps seem too high at the start of the roast, my roasts usually go:--
    1min 35C
    2min 60C
    3min 90C
    4min 110C
    5min 130C
    6min 146C
    7min 162C
    8min 173C
    9min 183C
    10min 195C
    10.15 first crack at 198C
    11min 206C
    12min 209C
    13min 212C
    14min 215C
    15min 218C first snaps of second crack
    profiles vary according to beans I am roasting, this was for a 3 bean pre-mix blend, they came out nice and even with no pitting.
    Enjoy your roasting
    gm

  11. #11
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    Re: I think I may have tipping issues with corretto roasts?

    Barrel,

    You could also try some sort of a cover on your BM to keep the heat in. This means you can move the HG away, which should prevent too high direct heat on the beans themselves.

  12. #12
    Mal Dimal's Avatar
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    Re: I think I may have tipping issues with corretto roasts?

    Quote Originally Posted by 4D626B697E416D626D6B69616962780C0 link=1248002077/6#6 date=1248009137
    Ever see them on beans from [s]Brown Bay[/s] or another professional roasted bean...

    As I said... *Only ever seen them when too hot too quick.....
    Definitely observed divots on professionally roasted beans Ive bought from time to time, never from Andy though. Must be said, Ive never noticed that the existence of the divots (or not) seems to affect the flavour in the cup to any degree that I can distinguish.

    Id say that if you observe this on a significant proportion of the batch, say more than 5-10% then that would be an indicator that you need to adjust your technique to lessen the degree to which the direct blast from your heatgun contacts the beans.

    Conversely, you might like to try fabricating a lid for the BM Pan, along the lines of what a few CSers have done, which allows you to reduce the heatgun temperature and thereby reduce the risk of over-cooking a percentage of the beans. If you have a fixed output heatgun, you can try fitting an extension tube to it which will cool the air blast a little before it enters the BM Pan.

    All the best :)
    Mal.

  13. #13
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    Re: I think I may have tipping issues with corretto roasts?

    Seen this before... *And have experienced it *:o with the Gene Cafe in particular.. *

    Others with experience may have a better way to manage it... *But from what I experienced...

    Too hot too quickly and they get scorched / hot spots...

    Never seen it in my KK roaster or HT...

    Ummm...dropped 250gm Brazillian Original Bourbon into the Ht this arvo, and unforeseen circumstances meant was just (maybe 10secs) into rolling SC *before I could drop them. Found probably half a dozen pitted as shown above.

  14. #14
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    Re: I think I may have tipping issues with corretto roasts?

    Quote Originally Posted by 46696062754A66696660626A626973070 link=1248002077/2#2 date=1248005248
    Quote Originally Posted by 282B38382F264A0 link=1248002077/0#0 date=1248002077
    Guys with my last couple of roasts I have had some beans that look like they have small chips in them in the middle of the bean. *I am wondering if I have roasted them too hot or for too long? *Perhaps my heat gun is too close

    They look nice and even inside.

    My profile is as follows

    Bean is Kenya Gitwe A

    Ambient temp 16

    1 min - 54
    2 min - 88
    3 min - 105
    4 min - 119
    5 min - 136
    6 min - 148
    7 min - 160
    8 min - 174
    9 min - 186
    10 min - 197 (First crack @ 10:20)
    11 min - 203
    12 min - 205
    13 min - 209
    14 min - 210
    15 min - 212
    16 min - 213 (First hints of SC) and roast pulled about 20 seconds later befor rolling SC

    I have attached a pic but I have played with the contrast to give you a better look at the bean.

    Any thoughts would be great.

    Cheers,

    Dean

    Seen this before... *And have experienced it *:o with the Gene Cafe in particular.. *

    Others with experience may have a better way to manage it... *But from what I experienced...

    Too hot too quickly and they get scorched / hot spots...

    Never seen it in my KK roaster or HT...
    Ummm...dropped 250gm Brazillian Original Bourbon into the Ht this arvo, and unforeseen circumstances meant was just (maybe 10secs) into rolling SC before I could drop them. Found probably half a dozen pitted as shown above.

  15. #15
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    Re: I think I may have tipping issues with corretto roasts?

    Behmor Coffee Roaster
    Thanks for all of the help guys. I bought a new Bosch digital HG today to give me a bit more control and the element seems a better hidden. I also modded the inner lid of the BM that I had kept.

    I will try and roast with and without the cover on the weekend and see how it goes



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