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Thread: soup can and drill roaster

  1. #1
    enjoy black coffee JamesM's Avatar
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    soup can and drill roaster

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    just spotted this... Roast Coffee With A Drill and A Soup Can

    interesting! hahaha

    *edit, source article: http://www.angelfire.com/pro2/panroa...offee/scr.html

  2. #2
    Senior Member Barry O'Speedwagon's Avatar
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    Must be something going on with coffee and soup. My Gene Cafe manual tells me that I should wash the roasting chamber in soup, but doesn't advise which type.

  3. #3
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    Quote Originally Posted by Barry O'Speedwagon View Post
    Must be something going on with coffee and soup. My Gene Cafe manual tells me that I should wash the roasting chamber in soup, but doesn't advise which type.
    Soup or soap?

    Barry

  4. #4
    Senior Member Barry O'Speedwagon's Avatar
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    Quote Originally Posted by Barry_Duncan View Post
    Soup or soap?

    Barry
    Well, you'd think so wouldn't you, but it definitely advises washing in soup. I should give Chris a ring and ask him what flavour he recommends

  5. #5
    Life-long Learner DesigningByCoffee's Avatar
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    Maybe "French Press Plunger" soup?

  6. #6
    Senior Member flynnaus's Avatar
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    ... ask him what flavour he recommends
    Maybe "French Press Plunger" soup?
    Is that a trick question? Bean soup, obviously.

  7. #7
    Senior Member Barry O'Speedwagon's Avatar
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    Quote Originally Posted by flynnaus View Post
    Is that a trick question? Bean soup, obviously.
    Very good point. Silly me...and I made some Dhal Makhani on Sunday night too....I can see the tasting notes for the next roast now....'Earthy, heavily spiced.....'

  8. #8
    Senior Member Yelta's Avatar
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    Can you imagine the smoke and chaff in the kitchen at the completion of the roast? it enough to get your kitchen privileges removed for life.

  9. #9
    enjoy black coffee JamesM's Avatar
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    ^ what he said

  10. #10
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    Hello people, first post in a looong time.

    Decided it was time to get a proper coffee addiction going and hence .. grabbed some green beans for the first time last week. smart grinder rocked up this morning so I need to go get some more supplys now, a better tamper and some better cups for a start..

    Anyway, I pulled out the popcorn maker, stuck some flywire over a can etc etc .. even stuck a thermocouple in there and played around with a PID controller .. but that was 3 days ago and I am moving on

    Seems to me that coffee beans need no temperature reading while they have a built in indicator. A colour change, correct me if I am wrong. I am not after the perfect coffee as I am pretty sure I could not tell the difference from a damn good one. So perfection is not my aim.
    Seems to me that popcorn makers are noisy and messy and inefficient and perhaps a little too fast ?

    I would prefer to do a slightly larger batch at a time as well.

    Which leads me to a design like this one, I have a spare 240v bbq spit motor that I intend to repurpose for this. 35 seconds a rotation leads me to think I will need about 10 vanes to get a reasonable amount of stirring with no burning.

    Now I was wondering the best way to fit some internal vanes, solder is a little close in melting point to the types of temps being used (using lead free 260C I think its molten)

    I followed the links on this design to coffeegeeks where he mentions he thought it was an aluminium can and was most dissapointed to find it was steel, so question one .. is a steel can no good ?
    does it add a taint or a toxin or similar ?

    Anyway, intentions here are to use a largish can over a heat spreader on a gas flame, (heat spreader like the ones that stop stuff burning in pans, I have one of them) make a stand for the motor and whack a drum on the end with some vanes in it, keep an eye on the roast and see what happens. I have a 3d printer as well, so I can make wierd things like gearboxes if I have to speed it up, would prefer to just weld things to other things though.

    Anyone see any problems with this .. just the steel thing has me concerned, the can I was going to start with is a 500g nescafe tin.

  11. #11
    enjoy black coffee JamesM's Avatar
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    all possible. there's even a mob in the USA that sells kits for your BBQ. Certainly can get hot enough, in most cases. Have fun!!

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    so here is the first test I did, this is before I lit the gas just to see if it would function ok.
    https://www.youtube.com/watch?v=yD-JS3knDRY

    I should have left the bar longer as the base of the tin is not close enough to the heat, I will try it more horizontal and a little lower later.
    It needs vanes in the tub, the beans closer to the front where not circulating to the rear enough, so I ended up with an interesting uneven roast.
    I need to find a drum more substantial than a light tin, I think holes are not a good plan over gas like this as I was getting some of the husk igniting when it gets caught in a hole but only after I removed the diffuser underneath. its a work in progress

  13. #13
    Coffee Nut fg1972's Avatar
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    Hi Stoney,
    I did once build a BBQ roaster using a rotisserie motor and found it rotating way too slow (4 or 5 RPM) causing uneven burns which didn't work very well even with vanes inside the drum.
    I replaced the rotisserie motor with the internals (motor/gearbox) of a cordless drill which gave me approx 40 RPM and the results were much, much better.
    You will probably find most roaster drums need to rotate at approx 30-60 RPM.

  14. #14
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    soup can and drill roaster

    ok, suspected that may be the case .. 35 seconds per rotation for mine, 1.8 rpm

    hot air is the go, it is so even compared to any sort of surface heating, IR heating is going to pick on darker beans I guess too.

  15. #15
    Senior Member fatboy_1999's Avatar
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    I use a car windscreen wiper motor. When new it went at around 55rpm. It's done a fair bit of work now (8 years) so it has slowed down a little to about 40rpm these days.

  16. #16
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    Behmor Coffee Roaster
    well I pinned the shaft so I could go horizontal, lowered the height and punched more holes and tapped shut a couple that where too large (husks igniting if over 3mm or so) and added the lid with a large hole cutout of it to retain more heat.

    its a little better, but still fail, you just can't beat hot air.. back to the drawing board



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