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Thread: Homemade Airgun Roaster

  1. #1
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    Homemade Airgun Roaster

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

    Finally got myself into gear and made a home roaster. Been meaning to for a while but the poppers been doing a good job and there wasnt too much incentive to change. However, the popper popped so I was roasterless.

    Heres what I started with:

    * Stainless Steel mixing bowl. Flat bottom and curved sides. ~$5
    * 70rpm 2.1 kg-m motor $20
    * Motor shaft adaptor $5
    * 12 VDC adapter $20
    * Mounting bracket (l shape) $1
    * Double ended bench vice $15
    * Hot air gun (free! already owned)
    * Stainless steel teabag squeezer $3
    * block of wood...

    So the general idea was to drill a hole through the bottom of the bowl, mount the motor through it and attach to a mounting bracket, throw the heat gun on top and see how it turned out.

    The hardest part ended up being the mixing blade. I ended up using half a teabag squeezer for that since the metal was fairly flexible and allowed me to twist into shape and get a good mix going.

    Attached is a pic of the setup. The first roast turned out very nice indeed. Ill be enjoying it on a Gaggia Evolution until this weekend when I pick up my Silvia!

    If anyone out there is interested in doing something similar and needs help, give me a yell. Not a bad result for $70 I think :)

    Cheers,

    Pete





  2. #2
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    Re: Homemade Airgun Roaster

    Hi Pete,

    Looks good, I have been thinking of doing the same, as my bread maker is always full of bread! The popper is still going strong though so no hurry for me. :)

    Some questions:
    1) where did you source the motor?
    2) are you thinking of going the DMM temp monitoring route?

    Brian

  3. #3
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    Re: Homemade Airgun Roaster

    Hi Brian,

    The motor was sourced from Jaycar. Heres the link:
    http://www.jaycar.com.au/productView.asp?ID=YG2732&CATID=&keywords=12v+moto r

    However, Id probably look at getting a heavier duty one if I did this again. It coped ok with 400g of beans *just*. But I could hear it slowing down and struggling a bit. Theres a 36rpm motor with a massive 6x the torque of the one I used. After monitoring the roast process, Im confident it would be perfect for turning the beans.

    https://secure.vividcluster.crox.net.au/jaycar2005/productView.asp?ID=YG2734&keywords=motor&form=KEYW ORD


    As for temp monitoring, I have a thermocouple. Unfortunately I"m still thinking of the best way to mount it without it interfering with the motor operation. Too close to the side and it might not ba accurate. Ill look into the DMM you were talking about - not sure what it is.

    Cheers,

    Pete

  4. #4
    Sleep is overrated Thundergod's Avatar
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    Re: Homemade Airgun Roaster

    As my corretto has died I might be doing similar.
    I already have a wiper motor I was planning to use but if I cant sort out a shaft adaptor then this could be the go.

  5. #5
    Senior Member Koffee_Kosmo's Avatar
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    Re: Homemade Airgun Roaster

    Quote Originally Posted by 5C494E564B425C5E5E503B0 link=1234694723/2#2 date=1234696240
    However, Id probably look at getting a heavier duty one if I did this again. It coped ok with 400g of beans *just*. But I could hear it slowing down and struggling a bit. Theres a 36rpm motor with a massive 6x the torque of the one I used. After monitoring the roast process, Im confident it would be perfect for turning the beans.

    I have a Jaycar motor that I never used Model YG2734
    Gearbox torque is 12 kg and runs at 36 RPM

    KK


  6. #6
    CoffeeSnobs Owner Andy's Avatar
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    Re: Homemade Airgun Roaster


    Excellent looking roast and great work on the roaster Pete.

    8-)

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    Re: Homemade Airgun Roaster

    Thanks guys, this thing took about 4 hours to put together, but I reckon I could do it in 1 now that Ive done it once :)

    And KK, yes thats the same motor I was talking about. Id recommend anyone else going down this path to get that motor. If the beans arent turning fast enough just put another blade on the other side.

    Im planning a V2. If it goes well Ill write up some instructions so anyone interested in upgrading from a popper (cheaply) can give it a go.

    Jaycar seems to be a good place to get the parts - they provide parts for model cars etc so have a great variety of shaft couplers and motors. There was an 11,000RPM model which sounded cool, but I didnt want to roast and grind at the same time :)


  8. #8
    CoffeeSnobs Owner Andy's Avatar
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    Re: Homemade Airgun Roaster

    Quote Originally Posted by 485D5A425F56484A4A442F0 link=1234694723/6#6 date=1234749745
    There was an 11,000RPM model which sounded cool, but I didnt want to roast and grind at the same time
    funny... ;D

    Do you have a picture of the paddle that you used?

    It makes all the difference to the end result, a good design turns, rolls, mixes pretty evenly without catching beans under it (as yours must do from the results). I have seen some that just lift the beans up and down restulting in a very ugly roast.


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    Re: Homemade Airgun Roaster

    Heres the blade... As you can see, its not touching the bottom. Its twisted at a 45 degree angle so it scoops and churns the beans.

    Actually, you can test it pretty easily using your green beans. Put a handful of roasted beans at the bottom of the unit, then top with your regular roasting quantity of green beans. Turn on the mixer (but not the air gun) for a few minutes and see the distribution of the roasted ones. They should be mixed all over the place. If its doing thisa you know youll get a decent even roast :)


    And no Im not entering this in any "most beautiful home roaster" awards.

    Maybe V2.0 will get the pretty upgrade. Or at least prettiER...


  10. #10
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    Re: Homemade Airgun Roaster

    Nice one grumpygeek!!! I am seriously loving the DIYs on this forum. I think i will build something similar to this and have a crack at roasting.

  11. #11
    Sleep is overrated Thundergod's Avatar
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    Re: Homemade Airgun Roaster

    Quote Originally Posted by 4653544C51584644444A210 link=1234694723/8#8 date=1234772179
    Actually, you can test it pretty easily using your green beans. Put a handful of roasted beans at the bottom of the unit, then top with your regular roasting quantity of green beans. Turn on the mixer (but not the air gun) for a few minutes and see the distribution of the roasted ones. They should be mixed all over the place. If its doing thisa you know youll get a decent even roast
    [smiley=tekst-toppie.gif]

  12. #12
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    Re: Homemade Airgun Roaster

    Awesome roaster, and thats a perfect Full City roast too!
    You have a great command of the effective and simple! I love it.

    CHAD

  13. #13
    Senior Member ozscott's Avatar
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    Re: Homemade Airgun Roaster

    Behmor Coffee Roaster
    Mate - that looks the goods! One of the advantages of the BM that I have is that the beans, even one KG of them are contained well within the box (in a box...) and with a KG in particular the mass is higher than it is wide, so it retains heat very well, but even then with a big bad Makita HG I have to be very careful at around the FC not to let it slow down too much and that means getting the HG tip very very close to the mass for a couple of mins...but I havent got tipping with this gun (perhaps the ceramics make a difference here). I suspect however that with an open set up like yours you could still do one kg but would need to either stick on a cover, or better still use 2 heat guns, with one on a constant half power say from say 8 mins into the roast and then playing with the other to fine tune the roast from there. Might we see a twin system on the V2? :)

    Cheers



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