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Bean Cooler and Insert for 20lt Bucket...

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  • #16
    Re: Bean Cooler and Insert for 20lt Bucket...

    Yes , Im going to reverse the fan and try the positive pressure as well , as the fan isnt fixed it is an easy thing to compare , I think I will put a cutout 5 litre cream bucket inside the outer of the sieve in case the beans decide to levitate, will get back later with the results, Gaz

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    • #17
      Re: Bean Cooler and Insert for 20lt Bucket...

      Ive always sucked the air through the beans, but all the loose chaff is dispersed when Im roasting in the Corretto.

      I decided in the beginning that if there was a chance of the beans blowing away then I wasnt going to risk it.

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      • #18
        Re: Bean Cooler and Insert for 20lt Bucket...

        TG you have a very valid point there , and after trying the positive pressure version for experimentations sake, I totally agree , to go through all the trials and tribulations involved losing beans is not worth thinking about, I am a biodynamic farmer as well , and I realize the love and care and sometimes heartache and despair involved to nurture a living thing to its ultimate reality. I am sticking with the negative pressure (suction) method as well.Cheers Gaz,ps I had a good look through the roasting section today,.I have to include this:
        Originally posted by -Alchemist- link=1134076855/140#157 date=1191837026
        Excellent work MJ, especially the temp switch - nice!

        Somewhere, a Dreamworks Studio Executive has just Googled this thread and gone, "What the....?" ;D

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        • #19
          Re: Bean Cooler and Insert for 20lt Bucket...

          My setup (of the last few years) comprises a generic bathroom exhaust fan providing positive pressure through a 300mm sieve and has never looked like tossing any of the beans out. You guys must be using industrial strength blowers for your coolers....

          Mal.

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          • #20
            Re: Bean Cooler and Insert for 20lt Bucket...

            Originally posted by Mal link=1222303036/0#18 date=1225799835
            My setup (of the last few years) comprises a generic bathroom exhaust fan providing positive pressure through a 300mm sieve and has never looked like tossing any of the beans out. You guys must be using industrial strength blowers for your coolers....

            Mal.
            Yeah, somewhat similar to my setup, and I also have never come close to blowing beans out. Also even with the positive pressure setup I am seeing some buildup of muck on the top of my fan motor, would be interesting to compare motor condition after a few years of suction, compared to a few years of pressure.

            BTW I use a splatter guard from the kitchen ware section as my sieve they only cost a few $ and work very well.


            Bullitt

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            • #21
              Re: Bean Cooler and Insert for 20lt Bucket...

              Interesting stuff guys, my fan must be the turbo version, :P I have been thinking about the temperature change initiated between positive and negative pressure setups ie pushing as opposed to pulling air through the beans , so Im gonna try both with my thermocouple and see if I get any difference, btw, I have also thought of the resistance on the fan motor of both setups , and that might be something for someone a bit better with a multimeter, as backpressure on a negative displacement fan can be a problem as can reduced airflow from too many beans in the sieve.Hey Bullitt I just saw what a splatter guard is, would be a good alternative, the sieves were sold to me by a slightly unscrupulous camping store sales person when I was actually after a gold pan.. found out later they were for sieving rocks and have sat in the shed for 5 years collecting dust until two days ago.. Ill have to offer the shady bugger from the camping place a cup of coffee as payback [smiley=beer.gif] Cheers Gaz

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              • #22
                Re: Bean Cooler and Insert for 20lt Bucket...

                Originally posted by Bullitt link=1222303036/0#19 date=1225835357
                Originally posted by Mal link=1222303036/0#18 date=1225799835
                My setup (of the last few years) comprises a generic bathroom exhaust fan providing positive pressure through a 300mm sieve and has never looked like tossing any of the beans out. You guys must be using industrial strength blowers for your coolers....

                Mal.
                Yeah, somewhat similar to my setup, and I also have never come close to blowing beans out.  Also even with the positive pressure setup I am seeing some buildup of muck on the top of my fan motor, would be interesting to compare motor condition after a few years of suction, compared to a few years of pressure.

                BTW I use a splatter guard from the kitchen ware section as my sieve they only cost a few $ and work very well.


                Bullitt
                I have tried it with fan sucking and blowing just to compare the difference
                Both ways work well
                The blowing test
                The insert I made (build details on post #1) completely eliminated any shooting beans as the cooling  surface sits deep approximately 150mm (6 inches) from the top of the rim so the beans that had the impetus to jump did not find freedom they just fell back down to rejoin their mates

                KK

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                • #23
                  Re: Bean Cooler and Insert for 20lt Bucket...

                  Ill have to take some more pictures of my setup.

                  Consists of a 60L plastic garbage bin from bunnings - $9
                  Cheapest 25cm exhaust fan I found in bunnings - $15
                  Sieve from hot dollar - $4

                  Cut the hole in the bottom of the bin which was easy as the rim at the bottom was 25cm.

                  Cut a hole in the top.

                  installed fan blowing air up. Installed the sieve. Works great. Cools 500g of beans in less than 60 seconds.

                  Only thing is I have to sit the bin on some bricks to give it ground clearance. But thats not a problem.

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                  • #24
                    Re: Bean Cooler and Insert for 20lt Bucket...

                    FWIW, those "geology" sieves can also be found at bee/honey suppliers along with good food quality plastic pails but both are probably a little more expensive there than than most would want to pay for a bean cooler. I have 2 which I use in extracting honey but unfortunately they wont be living with my nearing completion corretto  

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                    • #25
                      Re: Bean Cooler and Insert for 20lt Bucket...

                      Stainless food grade sieves available on evilbay

                      $31.80 with free postage to Australia

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                      • #26
                        Re: Bean Cooler and Insert for 20lt Bucket...

                        My father in-law has given me a gold prospecting sieve and thats what I use now
                        However it is a finer mesh than in this photo



                        The wife wanted her steamer insert back : for cooking of all things


                        KK

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                        • #27
                          Re: Bean Cooler and Insert for 20lt Bucket...

                          Originally posted by 2F2A2B2C3133373E3E580 link=1222303036/24#24 date=1237084835
                          Stainless food grade sieves available on ebay

                          $31.80 with free postage to Australia
                          I explored the Bay of Evil and also looked at prospecting sieves but all were too expensive.

                          I got my fine mesh sieve from the local $shop for $5.

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                          • #28
                            Re: Bean Cooler and Insert for 20lt Bucket...

                            I have been using a standard fan for cooling but for a while have wanted to go to an exhaust fan turned around to push, a sieve and bucket...keep the pictures coming folks!!

                            Cheers

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                            • #29
                              Re: Bean Cooler and Insert for 20lt Bucket...

                              Ive also been looking at an extractor fan with friction fit in a bucket (both quite cheap from bunnings). The fit with the fan "extracting" is very neat, but not nearly so good if it is turned over to blow up thru the bucket, in that the motor is then above the blades and there is very little airspace beneath the fan.

                              My (electrical illiterate) question is; can the direction of rotation of an AC motor be reversed in some reasonably simple manner?

                              I think I had now better toddle off googlewards

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                              • #30
                                Re: Bean Cooler and Insert for 20lt Bucket...

                                I have always blown mine using an 18V leaf blower. With 500gm of beans they dont blow away but they are cooled in under a minute. Smaller batches I use a splatter guard to stop the beans blowing away.

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