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  • Some I-Roast 2 examples

    After last Saturdays get together in Ipswich I thought Id try a few different beans and roast times.
    In hindsight I should have used the same beans with the different roast profiles but that gives me something to do tomorrow afternoon.

    1st roast:Stage 1 180c for 2:30 mins      Colombian Beans.
                 Stage 2 200c for 2:30 mins
                 Stage 3 205c for 2:00 mins

    I switched to cooling cycle 1 min into stage 3 because the beans looked ok.Ive noticed before that even after switching to cool cycle the beans can continue to roast a little.Sometimes a little too much.

    This was the most even result I got aa day.

    2nd roast:Stage 1 180c 2:30 mins          Altitude Premium Blend
                  Stage 2 194c 2:30 mins
                  Stage 3 200c 2:30 mins
    Switched to cool cycle 1 min into 3rd stage again.


    It doesnt look this oily in the flesh as they say.

    3rd roast:Stage 1 180c 2:10 mins       African Red Sea Blend
                 Stage 2 194c 2:10 mins
                 Stage 3 180c 2:00 mins
    I was able to let this run through.


    Some inconsistent colour here,Well see how it tastes in a few days.

    4th roast:Stage 1 180c 2:10 mins       Costa Rican Tarazu
                 Stage 2 196c 2:10 mins
                 Stage 3 180c 2:00 mins
    This ran complete too.


    A few lighter beans but I think it looks ok.I wont really know until tasting it I guess.

    The hardest thing with the Iroast is hearing 1st and 2nd crack over the noisy little bugger.
    Any suggestions,comments appreciated.
    Ill do a better test with one bean and several profiles over the weekend.that will give me a better idea of how to drive this thing.
    Cheers,
    kEN.

  • #2
    Re: Some I-Roast 2 examples

    Pics look good. Fairly similar to what Ive been getting.

    " The hardest thing with the Iroast is hearing 1st and 2nd crack over the noisy little bugger"

    Yes, noisy it is! Ive found that by sitting with my ear above the air
    outlet, so that I can hear the rush of hot air coming out (but
    not too close else you get an earful of hot air, which can be
    unhealthy ), then its dead easy to pick first crack, and second
    crack with a little practice. This position makes it easier to hear
    the difference between SC and the sound of beans hitting the glass.

    Also, its a good idea to stick a thermocouple down into the beans
    so that you can some idea of the correlation between programmed
    temp and chamber temp. There is usually a significant difference.
    That way you can tell whether or not your programmed changes are
    actually having an effect -- some of your temps are close together
    and there may not be much difference between them in practice.

    Another way to tell is to listen to the motor. If it slows down
    noticeably at one of your programmed points, then the temp
    is increasing (reduced air flow increases temp, and vice versa
    of course).

    Have fun!

    Comment


    • #3
      Re: Some I-Roast 2 examples

      Hi Hazbean,
      Thanks for the tips and suggestions.
      Maybe an earful of hot air will improve my hearing.
      I want to get a thermocouple as Ive read about the difference in temps....quite significant
      in some cases.
      Do you have any pics of how you positioned it.Im having some trouble working
      out how to mount it and make sure everything still locks in and seals well.

      As I said before Im going to try one variety of bean with several different settings to give me
      a better idea of of variations with temps and times.
      "Have fun"...you bet.

      Thanks again,
      Ken.

      Comment


      • #4
        Re: Some I-Roast 2 examples

        "Do you have any pics of how you positioned it?"

        No, I dont, but I looked carefully at the pictures on one of the
        reviews at sweetmarias and copied what Tom did. This is basically
        to insert the wire through a hole in the lid of the chaff collector
        assembly (easy), and the through one of the holes in the chaff
        collector. This is difficult, because the holes are just a touch too small.
        I managed to do it many times, but the small holes finally got the
        better of my TC and wore through the insulation. Ive now bought
        a new TC ($10 at DSE, bead type, cat Q1439, insulation rated to 260C, which is
        enough).
        If I go through the top again, Ill very slightly enlarge one of the holes first --
        Im now convinced that that wont affect the operation of the chaff
        collector, even when the wire isnt in place.

        I try to position the TC just alongside the inner "chimney", so that its
        in the bean mass.

        But first (hopefully this weekend) I want to try a different
        technique, coming up through the bottom, as per this posting:
        http://www.themeyers.org/HomeRoast/Topic13915.htm
        (first para of first post). Assuming I can decipher what he did.
        This technique is easily reversible, and puts the TC in a fixed
        position for consistency.

        Can always drill a hole, but I dont like damaging things, especially
        something like the iR2, where thermodynamics of the air flow is
        an important part of the machines operation.

        Comment


        • #5
          Re: Some I-Roast 2 examples

          Well running the TC through the bottom turned out to be
          absolutely trivial. Wish Id done it earlier.

          I actually took some pictures this time. But Ive never uploaded any
          before, so prepare for disaster ...

          There are four Philips-head screws in the bottom. If you remove them, the
          whole inner assembly slides out. Good for cleaning, but for this exercise,
          its only necessary to remove the front two, in order to loosen things up
          enough to be able to poke in the TC lead at the point shown in the first
          picture. It then passes between the seal and the glass.

          (Well it seems I can upload only one pic per post, so there will be three more
          posts after this one.)




          Comment


          • #6
            Re: Some I-Roast 2 examples

            In the pic above, you can see where the two screws have been removed, and
            where the TC lead has been poked down.

            You then have to put the pot on the base. With careful placement of the
            TC wire, you can make it emerge at a little opening just near the
            attachment point, as shown in the second picture.

            Comment


            • #7
              Re: Some I-Roast 2 examples

              When you put it in, make sure there is just enough in the chamber to be
              able to position it a sensible point. The third pic shows what it looks like
              inside.

              I did a test run with no beans in the chamber, which shows temp building
              up in the way I would expect. There was some noise from vibration of the
              TC wire, but that would be damped with beans in there.

              And it turns out my fourth pic is redundant, so thats your bloomin lot.



              Comment


              • #8
                Re: Some I-Roast 2 examples

                Hazbean, will the TC fit into the current multimeter that the two of us have? I noticed the different pluggy prongy things then the one I have at present.

                Comment


                • #9
                  Re: Some I-Roast 2 examples

                  Lucinda, in the first pic you can see a couple of alligator clips on
                  the end of the cables to the DMM. I clip those over the prongs
                  of the TC connector. Not ideal, and I should pull the connector
                  apart and solder in a DMM lead. One day ...

                  I do have a TC that connects directly to the DMM, but its wire is
                  thicker, and I prefer the smaller disturbance to the seal from the
                  one Ive used. And besides, the other TC is out "on loan" (along
                  with the DMM like yours).

                  Comment


                  • #10
                    Re: Some I-Roast 2 examples

                    Thanks for the pics and description Hazbean.Ive pulled it to pieces
                    to clean and never thought of going in from there.Great stuff.
                    Now Im off to find an open DSE to grab the TC.

                    Cheers,
                    Ken.

                    Comment


                    • #11
                      Re: Some I-Roast 2 examples

                      Heres a pic from last Monday.
                      Mystery Colombian beans 4 different roast profiles.



                      A: St 1 180c for 2:30
                         St 2 200c for 2:30
                         St 3 205c for 2:00

                      FC at approx 3:30 in. SC started approx 30 secs left.

                      B: St 1 180c for 2:00
                         St 2 206c for 4:00

                      FC 3 mins in. SC didnt happen or I missed it.

                      C: St 1 180c for 4:00
                         St 2 205c for 2:00

                      FC approx 2:50 in. SC nope.

                      D: St 1 180c for 4:00
                         St 2 206c for 1:00

                      FC 2:40 in. SC nope.



                      Hazbean how does your Iroast differ in temp?
                      From the quick roast I did last night mine looks to run a fair bit hotter.
                      Which probably explains the quickness to the above roasts.
                      Anyway Ill post the results later today.

                      Ken.

                      Comment


                      • #12
                        Re: Some I-Roast 2 examples

                        Heres a rough chart showing the difference between the Iroasts reported temp
                        and the temp measured by the TC placed as per Hazbeans advice.



                        The temp difference is roughly 40C when it has got into full stride.
                        At least it stays almost constant so I can experiment with lower settings.
                        More fiddling and twiddling....Oh goody.

                        Ken.

                        Comment


                        • #13
                          Re: Some I-Roast 2 examples

                          No wonder the beans in your previous shot look overdone....

                          40C is a HUGE error when roasting..... With the corretto I find a degree or two can make a significant difference...

                          I would think a variation of the size you are getting would be out of specification for the roaster.

                          Comment


                          • #14
                            Re: Some I-Roast 2 examples

                            Try this:

                            160C 7:00 / 200C 2:00 / 220C 2:00

                            With a bit of luck, this will get first crack at around 5-6min.
                            Then I found the ramp up to 200C would trigger second at
                            around 7:30.

                            Ive had reasonable success with this technique.

                            IMHO the TC is essential in order to see how the profile is
                            developing. The iR2 has an initial 3min warm-up phase which it
                            does pretty well regardless of what you program -- the TC
                            helps see what effect this has.

                            Comment


                            • #15
                              Re: Some I-Roast 2 examples

                              Hi JavaB,
                              I agree those differences are not good.The beast is out of warranty too.
                              Oh well Ill keep experimenting with much lower settings and try for consistency.

                              Hi Hazbean,
                              I have just tried doing a roast with 160C 4:00 / 170C 4:00

                              After 4 mins the indicated temp was 200C and the measured temp was 239C.
                              After 7 mins indicated was 209C measured was 262C.
                              Kenny we have a problem.
                              What variation if any do you get between the iRoast temp reading and the TC measurement?
                              I agree the TC is great only its confirmed what I feared.That the unit runs way too hot.

                              Ken

                              Comment

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