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First roast with corretto + PNG Wahgi

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  • #61
    G'day Dan...

    There are a few very good websites containing useful information about roasting coffee. A couple of the ones I refer to from time to time are...
    Coffee Roasting - CoffeeResearch.org , and
    Willem Boot Coffee Articles - PDF Downloads... https://bootcoffee.com/resources/

    Lots of great information to keep you interested...

    Mal.

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    • #62
      Thanks Mal!

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      • #63
        She died! After 54 roasts the motor in the bread maker gave up and doesn't want to play ball. I don't blame it with the amount of chaff and heat that passed over/through it.

        I have a bunch of improvements I'd like to make to the next roaster. Things like somehow sealing off the gap between the bowl and the bread maker. Too much heat was lost through the gaps and made cleaning out the chaff a pain. There is also an annoying issue of the Bosch electronic heat gun, where it will slightly adjust the fan speed if it's got trouble maintaining or reaching temperature (I'm assuming that's what it's doing when I hear the slight changes in fan speed). This could be the cause to the stochastic nature of the RoR at some points where it should be cruising along just fine. I'm no longer confident that I have 100% of the capacity control using this particular heat gun, especially in cold ambient conditions where it may struggle.

        I've been thinking about buying a 2000w heating element and hobbiest 50mm ducted fan and having complete control over the two. I'd then be able to experiment with arduino. Not an automated roasting system, but something I can control easily enough myself. It just depends how long I want to go having to put up with supermarket grade coffee.

        Anyway...this corretto served me well! A few great batches, a few not so great, but mostly better than typical supermarket coffee which was the aim all along.
        Last edited by dan110024; 26 October 2015, 07:57 PM.

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        • #64
          With regards to the heatgun, the heat from the breadmaker may cause the erratic behaviour which may cause the readings on the gun to drop and then catch up when there,s clear air.
          I normally run a fan on low speed which assists in blowing the chaff which would otherwise find its way into the heatgun and the heat/smoke away from the coretto as well as the roasting station.

          Attached pic is my roasting station which demands a fan for reliability.

          If you need more info about roasting, Coffeeshrub (roasting fundamentals) via Sweet Maria,s may help.Click image for larger version

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          • #65
            I do have a miniature fan which points at the heatgun. It is a possibility that variances in heat are affecting the output temperature. I really needed an environment temp probe to see what the output temperatures really were.

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            • #66
              What about the new Bosch 2300W Heatgun Dan...

              Unless you're doing batches of 1.0Kg plus on a continuous basis, I doubt that you would ever come close to stretching the limits of control with 2.3KW at your disposal...

              By way of an example, I only use ~1.3KW to control a batch size of 650g in my Corretto setup, so still have a further 700W up my sleeve if I needed to go to larger batches for some reason. Maybe there is a problem with your particular Heatgun too mate, as other CSers who use the same HG as yours have never reported this issue, that I am aware of at least...

              I use a "Makita HG6020 2000W Heat Gun", mainly because it uses a 'Closed Loop' control system to maintain an accurate output temperature. Control is facilitated with the use of an Heat Output dial that's graduated from 1-10. Not as granular as the control on the Bosch but nevertheless is accurate and repeatable.

              Mal.
              Last edited by Dimal; 28 October 2015, 12:03 AM.

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              • #67
                It turns out that the unstable RoR temps are put down to hot exhaust air being drawn back into the gun.

                I've started roasting in the driveway instead of the garage on nice days and the gusts of wind are overcoming the fan I use to blow the air away.

                So you two were right

                I would have thought the Bosch digital heat gun would have had a closed loop system too. I'm wondering if it can't react fast enough when a gust of hot air gets blown across the intake.

                Looks like I'll keep the roasting to the garage from now on.

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