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Thread: Home made coretto: Motor blades...

  1. #1
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    Home made coretto: Motor blades...

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi All,

    Been popper roasting for a while now, and decided to up the anti to a coretto so I dont have to roast as often.

    Ive bought a few parts to build it. So far Ive got:

    Rounded Stainless Steel Bowl
    12V DC power supply
    12V, 70 RPM motor
    Air Gun
    Double end Clamp
    Bench

    So thats almost it.. unfortunately I cant find anything good to use to attach to the motor to churn the beans when I turn it on. Heres the motor I got: http://www.jaycar.com.au/productView.asp?ID=YG2732&CATID=&keywords=12v+moto r

    Has anyone done this before? What did you use for the blade? Im also not sure where to drill a hole for the thermocouple Im sure the blade will hit it. I want the blades to be as close to the bottom of the bowl as possible to be able to curn all the beans.

    How about chaff collecting? Any ideas? Or do you all just let it fly all over the place...

    Thanks for all your advice.

    Pete

  2. #2
    Senior Member Koffee_Kosmo's Avatar
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    Re: Home made coretto: Motor blades...

    Hi Grumpy

    You will need to place a vertical piece of material and use a small exhaust U clamp

    Alternatively you can use something like this spring clamp

    You wont need a chaff collector as the heat gun will blow it all away :o

    KK




  3. #3
    Sleep is overrated Thundergod's Avatar
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    Re: Home made coretto: Motor blades...

    I dont think you can call it a corretto, which is a converted breadmaker.

    I too thought about building something like you plan to because I was having trouble finding a BM.

    Unfortunately I didnt get far enough in the build to answer your question.

    Thats a nicely priced motor youve found.
    It cost me that much for a 2nd hand wiper motor of unknown rpm.

  4. #4
    Senior Member Koffee_Kosmo's Avatar
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    Re: Home made coretto: Motor blades...

    My motor as in the picture is a Jaycar YG 2734
    12 kg torque and 36 RPM cost me $20

    Grumpy I got the 36 RPM because I thought that 70 RPM may be to fast

    The coupling I made myself

    Jaycar has some couplers here
    See Spider Coupler Set and Aluminium Hub with Set Screws

    http://www.jaycar.com.au/productResults.asp?whichpage=2&pagesize=10&keyword s=&CATID=9&SUBCATID=726&form=CAT&SPECIAL=&ProdCode Only=&Keyword1=&Keyword2=&pageNumber=&priceMin=&pr iceMax=

    KK

  5. #5
    Mal Dimal's Avatar
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    Re: Home made coretto: Motor blades...

    Quote Originally Posted by Koffee Kosmo link=1224126524/0#3 date=1224136992
    Grumpy I got the 36 RPM because I thought that 70 RPM may be to fast
    Mmmm, Id reckon that roughly one rev per second is close to ideal. Probably need to watch batch size with that motor though.... Due to centrifugal force, a lot of the beans will end up close to the edge of the bowl and available torque will be significantly reduced out there. Wont be hard to sort out though....

    All the best Grumpy [smiley=thumbsup.gif]
    Mal.

  6. #6
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    Re: Home made coretto: Motor blades...

    Behmor Coffee Roaster
    Wow - thanks everyone. Glad to see a few of you have done this before. the aluminium hub with screws looks ideal. Just need to find a suitable blade now. I guess Ill try and find something curved that will push the beans out. They should hopefully form a kind of convection and the top layer should move towards the centre. Thats the plan anyway.

    After Im done I will do a sample roast - see how the motor and blade goes. Worst case scenario Ill shell out the $20 for the higher torque motor. Ill take a few pics and let you all know it goes.

    Thanks again for the help - much appreciated.



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