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Thread: Corretto roast questions

  1. #1
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    Corretto roast questions

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi,
    I am fairly new to coffee roasting. *I have a fresh roast 8, and have done some successful roasts in a pot. *I recently tried the corretto set up and was successful the first time. *My second attempt wasnt. My set up:

    (no pictures yet)
    West Bend BM - dough cycle has 6 minute pulse 24 minute continuous.
    Wagner Heat Gun (1200 Watt) two modes 750 and 1000.
    Fan to blow the chaff.
    The heat gun sits about 1 inch into the BM, about 5-6 inches above the beans. *The lid to the BM is open.

    My first roast (Brazil Yellow Bourbon) in this set up went ok. *I let the BM pulse for the 6 minutes and then turned on the HG when it started to run continuously. *I had a hard time hearing FC so I just went by the look. *I ended the roast at 24 minutes, right when the dough cycle stopped. * The roast looked good and tasted good the next day.

    My second roast (Ethiopian Yirg) didnt seem to go as well. *This time I turned the HG on low for about 3.5 minutes during the pulse cycle and then turned it on high when it started to continuously turn. *Still could not hear FC so I had to go by sight again. *I pulled the batch at around 24 minutes (including the 3.5 minutes on low heat). *The beans looked ok (Not as dark as I wanted). *I cooled them off and put them in a sealed glass jar. *I also roasted some Yirg in my Fresh Roast 8 to compare. *Both batches looked almost identical. *The next morning I opened the jar that I did in the Corretto and noticed that it didnt have the same good smell that I am used to. *It just didnt have much of a smell. *I brewed it this morning (12 hours later) and it didnt taste so great. *I will brew the Fresh Roast 8 roast later to compare. *Is it common for the beans to not smell after sitting for 12 hours? *Every other roast I have done has had that good fresh roasted coffee smell.

    My concerns are that my HG isnt powerful enough. Or, my HG isnt close enough to the beans. *It seems like the roast shouldnt take more than 20 minutes to complete (through SC). *I really dont want to spend more money right now on a new HG, so I am hoping that it is my HG not being close enough to the beans. *How close should it be?

    Also, is it ok to turn the HG on high while the BM is pulsing?

    Thanks for the help.

    Tim

    N.B.

    Gday Tim,

    Welcome to CoffeeSnobs....[smiley=thumbsup.gif]

    Can you keep image size to a maximum of 640(W)x480(H) pixels please mate? Larger images can slow down page loading considerably, especially for people with limited bandwidth connections..... :(

    If you are unsure about how to easily resize your images,
    this link will hopefully assist :).

    Thanks,
    Mal.



  2. #2
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    Re: Corretto roast questions

    Welcome g8rgrad2k,

    I might be guessing , but are you based out of OZ...???

    HG temps *F is always a clue !

    By what youre saying here , your HG might not be powerful enough , OR close enough to the bean mass ,and you dont seem to have any way of measuring your temps.

    So definitely get closer and fabricate a lid of some sort , be it timber or metal and cover 2/3rds of the BM basket.

    Did you get smoke and chaff from your roast ???

    Im guessing the whole sheebang didnt enough heat.

    If you really have to use the pulsing cycle, you might want to just use the last 3 min of it with HG on low and mounted about 4-6" above the BM basket...... When continuious mixing starts crank up the HG and have the tip at least 1" into the basket , with your cover in place .

    Everything becomes easier when you have a thermometer telling what temp the bean mass is .

    Good Luck

    hotshod

  3. #3
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    Re: Corretto roast questions

    Quote Originally Posted by 2D72382D382B2E78214A0 link=1248958408/0#0 date=1248958408
    about 5-6 inches above the beans
    Seems a bit too far away.
    How large was the batch?

  4. #4
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    Re: Corretto roast questions

    I know this is an incomplete setup. I was just trying to get by for a month or so. I forgot to mention the amount of beans I put in the BM. The first batch was 200g the second was 350g. Neither batch covered the mixing arm.

    Thanks,
    Tim

  5. #5
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    Re: Corretto roast questions

    Yep, definitely sounds like not enough heat. I have only ever used a 1600W and 2000W gun so dont know if 1200W is enough - put it on full heat and closer to the beans for starters.

    Your roast times do seem a little long and the pale colour of your beans in the pic suggest heat issues over the length of time you are talking.I dont like going much beyond 15mins with the corretto, chrs

    CTGTC ;)

  6. #6
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    Re: Corretto roast questions

    Hi Tim and CSrs,
    (as a new corretto maker/user myself take anything I say with a grain of salt)
    Some photos of your Corretto would be helpful.
    What are the dimensions and mass of your roast pan (RP) and what depth are the beans for the 200g and 350g roasts.
    My thoughts are: the wattage of the heat gun (HG) must match the bread maker (BM), particularly:
    a tiny HG + huge, thermally massive or heat dissipating RP and BM may not reach ideal roasting conditions.
    A thermocouple/temp probe that will measure at least to 250C/500F will be a great help in coffee roasting.
    (as a minimum around AUD $11 including postage from Hong Kong *Ebay). *
    If lack of heat is your problem my suggestions are:
    - Rig HG outlet 3-4 inches from bean level.
    - Preheat the RP prior to adding beans.
    - From the moment of adding beans ensure your HG is on the high setting if not already and the BM stirring continuously, ramp up temp into the fast drying temp range as quickly as possible.
    (Not everyone will favour my technique but here it is: I have been using an old 1600W HG mounted at a fixed height through a hole in a fibreboard cover, which closes 2/3 of the BM cavity. My RP is cylindrical d=5.25". Throughout the roast the HG remains in the fixed position, heating is varied by switching HG between the 3 available settings Off, Lo + Hi.
    I add 500-600g of beans to start my roasts when the roast pan reaches ~500F with assistance from the BM element and HG. I am happy with the results obtained but that may be due to my ignorance).

    Kind Regards
    Lindsay

  7. #7
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    Re: Corretto roast questions

    Welcome to CS g8rgrad2k!

    Definitely a heat issue. Would like to see a pic of setup if possible.

    A fan is used to not only blow away chaff, but also to keep your HG cool if it has an automatic thermal-cutout safety system. It may be that your HG nozzle is too far into the pan, and the circulating heat is being sensed by the thermal-cutout system and cutting the power intermittently. This can stall a roast which is what I suspect is happening. The cutout can range anywhere from one second off to five seconds on or off for a lot lot longer. Listen to your HG for slight changes in pitch during the roast.

    If this is an issue, you may wish to raise your HG to ~1cm above the top of the pan lip, make sure your fan is cooling the heatgun, and increase your load in your BM pan to 1/3rd to half full. Otherwise you may wish to try a setup with a cover of some description.

    The fact you couldnt smell that nice scent off the Yirg coffee even though it reached a similar visual level to your other roaster indicates it was baked, not roasted. Too low a heat across too long a time. Do head for something around 14-18 minutes.

    I would suggest at this point that you ignore the low heat level on your gun, and ignore the 6 minute pulse: start with high heat as soon as the fast kneading commences. You can play around with pre-heating later, however it may be contributing to a baked result, so eliminate it for now.

    Also, check your fan isnt blowing into the upright lid of the BM and whooshing down into your beans - can happen with a new setup.

    Good luck.

  8. #8
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    Re: Corretto roast questions

    Thanks all for the tips. *I roasted again last night (500g) and instead of using a mic stand for the HG, I just held it about 1 inch above the greens. *I reached FC in 10 minutes and finished the roast in 13:45. *Much better results (although I havent brewed it yet). *I did see a few darker spots on some of the beans. *Not charred just darker. *Maybe I can cut back to 2-3 inches above the beans.

    Now I just need something to hold the HG over the beans that can get close enough. *

    Tim

  9. #9
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    Re: Corretto roast questions

    Sounds like your on your way to being a corretto roastaholic..... Go for it !!!!

    Everything will become easier with a Thermometer and a thermocouple sitting in the beans

    hotshod

  10. #10
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    Re: Corretto roast questions

    I used to hold my HG (Makita) close to the beans when I first started roasting, then I noticed the plastic housing around the nozzle started to melt a little. Just FYI. I would try a cover. Sometimes I use a disposable aluminum pie pan, bend a part over for the HG and lay a small rock on top to hold it in place.

  11. #11
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    Re: Corretto roast questions

    Behmor Coffee Roaster
    Most plastic housings are removable.....Ryobi & Bosch for sure .....

    And if they are not ..... you can cut them off with a hack saw , ( I cant help myself.... thats what I did with my early 5 year old 1600w Ryobi )

    Greg



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