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First roasts with data logger

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  • #46
    Re: First roasts with data logger

    I drilled a hole right through my bread pan and machine in the rear left corner (when facing the machine). Mounted the thermocouple from under the machine with the probe pointing upwards in to the breadpan. For a couple of reasons, the main one being so I can pull the breadpan fast and easily without worrying about pulling the probe first.

    There are pics of exactly what I did on my web site. URL is in my profile I think. Otherwise its "thebeaningoflife dot com"

    Its easy to take the bottom panel off most BMs, and a good idea to ensure you dont drill through a belt or pulley

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    • #47
      Re: First roasts with data logger

      Oh. Behmor, hahaha, post fail. Sorry.

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      • #48
        Re: First roasts with data logger

        Originally posted by 4B4B4B010 link=1318770716/44#44 date=1322006396
        I did it this morning and found it pretty accurate, reaching 99 degrees at boiling point, so you probably cant expect much more than that.
        Excellent... 8-)

        So now you know that the indicated temperature is close to spot-on. If you do decide to grab a new Cordless Drill and attempt the fitting of the s/s probe yourself, try a couple of practice runs first on some scrap metal first - Milo Tin Lids for example...

        When youre ready to have a go at the real thing, stick some Masking Tape on to the side of the Behmor where you will be marking out the hole location. Once marked (and double-checked), select a very small Drill Bit to drill a Pilot Hole first. Place an old towel on the floor, stand the Behmor upright on the opposite end to that which will be drilled.

        You will need to use very little force to drill through the two layers of the Behmor panelling, only fractionally more than the weight of the drill itself. Carefully line-up the tip of the Drill-bit on the hole site youve marked out on the masking tape, then start drilling with the drill held perpendicular to the surface and at a low speed. Get someone to help with judging that the Drill is being maintained perpendicularly if youre unsure about this. Dont overdo the force being applied to the Drill though, a new sharp drill-bit wont require much effort.

        After successfully drilling the Pilot Hole, replace the small drill-bit with the desired final size, and then follow the procedure written above. You will need even less force applied to the Drill this time, as the larger drill-bit will practically pull itself through the Pilot Hole, so take it gently.

        You can clean the burrs from the internal hole using the largest drill-bit in the pack or even better, use a Countersinking Bit to clean off the sharp burrs and afterwards, vacuum out all of the metal cuttings. Thats it... Remove the Masking Tape and fit the s/s Probe and start roasting.... ;D

        Mal.

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        • #49
          Re: First roasts with data logger

          Youre a king amongst men, Mal.
          Thank you.

          Ill pick up a basic drill at Bunnings on Saturday and make it my weekend mission to get the holes drilled.

          Thanks again.

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          • #50
            Re: First roasts with data logger

            Job done.
            I followed your instructions, Mal (and Andys initial thoughts on it), and managed to get it done.
            Its not perfect but its a snug fit.

            I just did my first roast with the SS probe and unfortunately got some very weird results.
            The read of the ambient temperature was accurate but as soon as i did a one minute preheat, it was reading just over 100c.
            Once i started the roast, the temp shot up astronomically, hitting 200c after only 5 minutes.
            By the time first crack actually hit it was reading something like 260c.

            Any ideas why that happened?
            Going in i thought if it was going to be inaccurate, itd be on the lower end given there is always a chance of heat escaping through the hole the SS probe slots through.

            Very, very weird but im going to do another roast, this time without a preheat, and see what happens with that.

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            • #51
              Re: First roasts with data logger

              Second roast done, this time without a preheat, and again the same problem.

              Again it hit 200c barely through 5 minutes, peaking at something like 285c.

              After logging the results (by hand), it seems like its moving in a manner consistent with a normal Behmor roast profile, its just that its a good 70-80c hotter than it should be.

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              • #52
                Re: First roasts with data logger

                Hi Ristrom I think you will find it is consistent with the location of the probe. You are not measuring bean temp but a temp in close proximity to the drum. When I moved from the bead to the SS / template my measured temperatures increased. If the roast is ok I would not worry. I did a roast using 1/2 P2 B++.. and if you look at the attached graph it gets close to the 200 Deg in 5 mins that you mention. The graph is odd but the roast was good. If you do a 1lb roast it takes longer to get to the 200. If you still get to the Oak Room I could bring down my laptop and compare some profiles, I usually drop in most days for a coffee as I work nearby, their coffee is sensational !

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                • #53
                  Re: First roasts with data logger

                  Originally posted by 525252180 link=1318770716/49#49 date=1322369151
                  Job done.
                  I followed your instructions, Mal (and Andys initial thoughts on it), and managed to get it done.
                  Its not perfect but its a snug fit.
                  Great stuff Ristrom.... [smiley=thumbsup.gif]

                  Even though your observed Temps may seem a bit odd to you, at least you can now compare directly with other Behmor owners who have used Andys standard.... 8-)

                  Mal.

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