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Thread: Home Roasting Question - Newbie

  1. #1
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    Home Roasting Question - Newbie

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi,
    I have been using a popcorn maker with some success to home roast but have decided to now try the Corretto method. I have just purchased a Breville breadmaker and Bosch heat gun that has an electronically controlled heat control via a pushbutton and digital display with a 3 speed fan. The heat gun can hold its temperature within 10 deg. C when set.
    My question is this - I have viewed other CSs roast profiles and would like to know should I just leave the heat gun hot air on a set temperature throughout the roast process (approx. 210 deg C) or should I alter the heat curve of the HG to match my bean temperature so it follows a desired roast profile. I am also using an infrared digital handheld temp. probe to check temps. Many thanks in advance. :-/

  2. #2
    Senior Member GregJW's Avatar
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    Re: Home Roasting Question - Newbie

    Hi there Quantum40 and welcome.

    I dont think there is any one method that is 100% correct, but FWIW mine (with a variable temp Makita hg - just with a numbered dial, not digital temp display) is to adjust the temp at least twice through the roast (say, for an average 600 gm batch):

    1. Start off at a fairly low temp / gentle ramp for the first 4 mins (approx) - my hg is set at abt 45-50%
    2. Increase temp (I increase mine to abt 70%) up to 1st crack (ideally at 10-12 mins)
    3. Reduce temp then (mine goes back to 45-50%) for a slow (apx 6 min - abt 3 deg per minute) ramp up to 2nd crack.

    I dont adjust the air flow or position of the hg. Obviously, tweaks and adjustments in temp are made through the roast to account for variations in batch size, ambient temp, different bean types, etc. Correttos are fairly "hands-on" roasters (which is one of the appeals for me). I rely on my temp probe/dmm to monitor how the roast is progressing (as well as sight, sound and smell).

    Hope this helps. Whilst a bit difficult at first, after a few batches it will become second nature. Cheers,

    Greg

  3. #3
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    Re: Home Roasting Question - Newbie

    Tip #1 is dont sweat it so much. As you try a few roasts, youll see what happens and figure it out. My usual approach is to vary the distance of the HG from the BM, rather than tweak the power. This is easier to do one-handed, though I have the same HG as Greg.

    Would also recommend a thermocouple proble, though I did plenty of roasts without any temperature monitoring.

    Also, your HG will need to be set higher than 210 to achieve that temp in the beans...

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    Re: Home Roasting Question - Newbie

    Quote Originally Posted by 6246525D47465E0703330 link=1273110514/0#0 date=1273110514
    My question is this - I have viewed other CSs roast profiles and would like to know should I just leave the heat gun hot air on a set temperature throughout the roast process (approx. 210 deg C) or should I alter the heat curve of the HG to match my bean temperature so it follows a desired roast profile.
    I roast with the same heatgun and start at about 400 (depends on ambient temp) which gets me to about 130 at 5mins and then 1st crack at about 12-13mins.
    Then down to 380 and further at intervals to maintain 3-4/min till 2nd crack.

    I used to ramp up slowly to give a more linear path to 1st crack but found I couldnt tell the difference in taste.

    This is logged with the DMM from Beanbay and USB software available from this site.

    For me this method makes roasting a very simple task.

  5. #5
    Super Moderator Javaphile's Avatar
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    Re: Home Roasting Question - Newbie

    Quote Originally Posted by 587C68677D7C643D39090 link=1273110514/0#0 date=1273110514
    I am also using an infrared digital handheld temp. probe to check temps.
    Quote Originally Posted by 7A61687E7D70090 link=1273110514/3#3 date=1273113806
    This is logged with the DMM from Beanbay and USB software available from this site.
    Infrared temp devices are notoriously inaccurate when dealing with roasting coffee. For more in-depth info on why this is do a search on here for infrared.

    The DMM for sale in BeanBay (http://beanbay.coffeesnobs.com.au/ViewProduct.aspx/318-usb-temperature-data-logger) will give you a much more accurate indication of the temp of your beans and when used with a computer will show you a real time graphing of the temp vs time and allow you to record this info for future use or sharing with others. See this thread for more info on the DMM: http://coffeesnobs.com.au/YaBB.pl?num=1236075603


    Java "Gave up on IR long ago" phile

  6. #6
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    Re: Home Roasting Question - Newbie

    Hi Q40,

    Like other posters have said , we all wrestle with our own correttos in slightly different ways.

    My general advice would be get a Thermocouple asap , then you know whats going on in the BM......
    Personally I start slow until the TC is showing 60* ( this may take 3+ min....) BUT I call it 2 min then have my bean mass increasing at 15*/per min...... whilst recording temps every min , I find the whole process hands on, increasing HG temps as well as raising and lowering HG position to achieve each minute mark.( anal I know but mentally I divide each min into 0-20-40 sec) to help stay on track.

    Generally hitting 1st C at 12-30min @ something just over 200*and then reducing heat input to achieve 2nd C between 17 & 18 min and at temps of about 218 -222*...

    Originally I was overly cautious and did roasts that were too small, I think any corretto should be roasting at least 400g of green bean .......
    The more you can load into the corretto and still hit your temp/time line ... The more stable the roast will be and easier to control as you head into 2nd C.

    Good luck and have fun..... get a TC

    hotshod

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    Re: Home Roasting Question - Newbie

    Thank you to everybody who answered my newbie question. I have just purchased from BeanBay some Ethiopian Gambella sundried green beans and now look forward to firing up the Corretto home roaster.
    Andy, do you have any idea when you will have the USB temperature meter in stock, as my initial idea of using a handheld IR thermometer appears from forum members to not be the ideal tool for the job!
    Once again thankyou to the forum members who shared their knowledge and advice.
    Quantum40 ::)

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    Re: Home Roasting Question - Newbie

    PM with info sent ......

    Andys USB thermometer / thermocouple is very useful if you intend to use a laptop to monitor and track your roasts

  9. #9
    Super Moderator Javaphile's Avatar
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    Re: Home Roasting Question - Newbie

    Behmor Coffee Roaster
    Quote Originally Posted by 785C48475D5C441D19290 link=1273110514/6#6 date=1273706389
    Andy, do you have any idea when you will have the USB temperature meter in stock
    Reading of the thread posted previously will reveal all. http://coffeesnobs.com.au/YaBB.pl?num=1236075603/205#205


    Java "Psychics R Us" phile



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