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Thread: TO Mk II + Cooler

  1. #1
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    TO Mk II + Cooler

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    So after my initial success with the TO Roaster, Ive fixed my base & built a cooler to go with it. Did a couple of roasts tonight, another Ethiopian Gambella Sundried, and a Brazillian Pulped Natural. In hindsight I should have waited until tomorrow & daylight since it looks like Ive pulled both of them a bit early. Perhaps I should just call them cupping roasts ::)

    The culprit I think is my new cooler, which is far too effective (cools the beans to room temp in under 2 minutes), so the beans havent kept coasting along that little longer like they did with my first sieve ->bowl->sieve cooled roast.

    Heres a few shots of the Mk II TO Roaster & Cooler.
    Roaster action - http://www.youtube.com/watch?v=hPbWeZmPJoI










  2. #2
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    Re: TO Mk II + Cooler

    A couple more shots attached including the resulting roast. I should have said in the initial post that the cooler was built using a bathroom exhaust fan which moves 650 cubic l/h. I built a box from particle board with a raised floor which holds the exhaust fan, and a SS sieve from the local craptastic/bargain store in the top. Theres holes then cut out at the bottom to give the air somewhere to go. I give the beans a brief stir & theyre barely warm to the touch in a minute.
    So, a little longer in the roaster next time (might do one or two more tomorrow for backup/comparison).

    Thanks to KK for the inspiration & to russellb for the PC power supply idea. The motor for the agitator runs happily across the 12v & 5v rails & the PSU was free from a mate.




  3. #3
    Senior Member Koffee_Kosmo's Avatar
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    Re: TO Mk II + Cooler

    Welcome Version 2
    I see you have applied the KISS principal on the agitator

    If the bottom pot is permanently secured to the board top it would be prudent to get/make a removable chaff collection insert for easy cleaning

    Quote Originally Posted by 213622232D450 link=1269693250/0#0 date=1269693250
    Did a couple of roasts tonight, another Ethiopian Gambella Sundried, and a Brazillian Pulped Natural.In hindsight I should have waited until tomorrow & daylight since it looks like Ive pulled both of them a bit early.Perhaps I should just call them cupping roasts
    I have made a comment on another thread
    Last years Gambela roasts very even but the most resent beans are hit and miss (I suspect picked under ripe)

    KK

  4. #4
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    Re: TO Mk II + Cooler

    Thanks KK. I just use the garage vacuum to clean up the chaff, followed by a quick wipe with a cloth :) I found securing the pot helped prevent it moving with the agitator.

    I did try to keep the agitator simple, with an arm to move beans in & one to move them out (simple version of a commercial roaster cooler). I did a test with a few coloured beans & they were moving in->out->in & from on-top to into the bean mass only to appear somewhere else again a little later, so Im happy enough with the agitation for now.

    The roast of the Gambella was slower this time (600g instead of 500) and its not showing any signs of the roast defects I got in the first roast. In particular, nothing turned to charcoal & no beans appear pitted from climbing to second too fast. Of course, this could be as simple as they didnt get to spend long enough at SC to show these signs. Ah well, some fine tuning of my eye is in order, as well as the introduction of a thermocouple so I can measure as well as observe.

  5. #5
    Senior Member Koffee_Kosmo's Avatar
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    Re: TO Mk II + Cooler

    One other tip to make it a neater job

    One can make a right angle bracket to secure the motor

    Use the screws on the shaft side of the motor / gearbox housing
    Just make sure you dont accidentally pull it apart by using electrical tape to hold it together at the join before you take the screws off

    KK


  6. #6
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    Re: TO Mk II + Cooler

    Looks the goods!, seems a few KKTO owners are now mounting them in desks of sorts, i love my KKTO, its just so adaptable!!!!

  7. #7
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    Re: TO Mk II + Cooler

    Had some of the Ethiopian in a French press this morning. I dont think Ive got an espresso roast there, but its quite pleasant In the cup.
    I think Ill just treat roasting mistakes as opportunities to drink other styles of coffee.

    I do still need to make a proper mount for the motor, but the cable ties & the two screws to stop the motor turning on the mount seem to be working for now.

  8. #8
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    Re: TO Mk II + Cooler

    HI

    looks really good

    Where did the sieve come from? i need one or two like that. :)

    cheers
    Leeham



  9. #9
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    Re: TO Mk II + Cooler

    Behmor Coffee Roaster
    The sieve came from my local Asian bargain store. You know the kind where you can buy computer parts, to cookware to garden rakes & aviaries. Cost all of $5.



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