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Thread: Heat gun roasting problem

  1. #1
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    Heat gun roasting problem

    After months of planning and building I finagling built my heat gun bread maker setup, a.k.a. a corretto. I did my first roast last night. These went great up to first crack. I realized the motor and and the heat gun combined are too loud to hear the crack. Any suggestions?

  2. #2
    Coffee Nut fg1972's Avatar
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    I reckon you will get used to it. Also you should notice the smell changing as it approaches 1st crack. Out of interest what time and temp did you roughly hit 1st crack? Could also be that temp was not ramped up high and or fast enough where it gradually just touched on 1st crack. When you hit it properly, it is quite literally snapping crackling and popping and a bit hard to not notice.

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    Roughly 380F and at about 9 and a half minutes. However being my very first roast I was conservative on the heat to start with amd ramped it up late.

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    Coffee Nut fg1972's Avatar
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    9.5 minutes and 380F (190C) depending where the probe is sounds about ballpark.
    You could try ramping up the heat a bit targeting around 395F at the 9 minute mark and see what happens.

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    I barely got it there. I kept the heat low early. I didn't 300 until 8 mins and checking my log it was 380ish around 10 and a half mins. So it was slow. Next go around I'll definitely get it up to 300 within 5 mins and back it off a little and go up to the 390s

  6. #6
    Senior Member Yelta's Avatar
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    FWIW! I roast 725 grams of green as a batch.

    Temp probe roughly in centre of bean mass.

    Start from cold, Bosch heat gun set on 500C (depending on ambient temp) mid blower speed.

    I hit first crack at almost spot on 200C every time, approx 14 mins (easy to hear)

    Another 5 mins (approx) to second crack (yes I can hear it) @ approx 225C then into the cooler.
    DSC_0278_1000x669.jpg
    DesigningByCoffee likes this.

  7. #7
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    Thanks yelta.

  8. #8
    Life-long Learner DesigningByCoffee's Avatar
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    What beans are you using? Some beans are more vigorous than others. And how much heat you give them into first crack can also change the intensity of the cracks. You should also see chaff/smoke leading into first and second crack.

    While you’re getting a hang of the figures, if you partially cover the pan with a few layers of foil or a brick (leaving an entry and exhaust port) that can help to shield you from some of the mixing rattle and make the cracks easier to hear.

    Cheers Matt

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    I'm using a Brazil Pulp Natural. The smoke and chaff is the only way I knew it was in first crack until I shut off the heat and motor just long enough to hear it. I built a lid for it. It's a double layer of a high density board with a sheet of 18 gauge stainless steel on top. No exhaust in yet but I will put one in, in the near future.

  10. #10
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    So I roasted my second batch today. Hit 300f at 3:36. 360f at 7:45. 400f at 11:20. Which is a decent amount faster than the 1st. I still couldn't hear a crack over the heat gun and motor. I know roughly when it start based of the smoke and chaff. That is all I have of that bean I'm gonna try a different bean later this week. If it's the same then I'll learn how to roast with hearing the cracks. 20180520_165326.jpg]

  11. #11
    Senior Member WhatEverBeansNecessary's Avatar
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    Looks like a really nice even roast, well done!

    Something to remember is that some beans crack quieter than others. Sometimes it's like a firecracker going off and sometimes a twig snapping from 100m away.

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    Thanks. I cant wait to get them in the expresso machine.

  13. #13
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    Done another roast last night. These definitely had an audible crack. This time my problem was I kept waiting for the 1st crack to end and it seemed to go on and on. Before I knew it there was smoke everywhere and I have a dark French roast. It's still drinkable but any long and it wouldn't be. There is definitely a learning curve for me.

  14. #14
    Coffee Nut fg1972's Avatar
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    Behmor Coffee Roaster
    Awesome, sounds like it's all happening now. Enjoy.
    I reckon it will taste even better when you ditch that expresso machine for an espresso machine, I had a laugh

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