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Thread: large drum roasters, some stupid questions

  1. #1
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    large drum roasters, some stupid questions

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Unfortunately I havent see a large commerical drum roaster up close or in action yet. So I have some silly questions on their operation. ::)
    Now Ive looked at many external pics but none show the internal workings/layout etc.

    Basically I what to know how the beans get out?

    Im lead to believe most drum roasters have bean agitators in the form of angled blades inside the drum. *Is it a simple matter of opening the front shut and reversing the drum rotation which in turn draws the beans to the opening and out :-/?

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    Re: large drum roasters, some stupid questions

    From what I can work out...
    The vanes in the drum constantly force the beans toward the front of the drum and with the door shut the beans stay in. Opening the door allows the beans to be pushed out the door and into the cooling tray.



    Stephen

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    Re: large drum roasters, some stupid questions

    Thanks,
    Sounds like Im on the right track then.

    Just playing around with some sketches....

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    Re: large drum roasters, some stupid questions

    Ive been sketching too...
    I was wondering what size and shape to make the support arms (spokes) for the drum. I guess round pencil width spokes would be fine.
    Other concerns were:
    Viewing window
    Convection fan
    testing spoon
    No wonder real drum roasters cost so much :(
    Check out this little fella
    http://www.diedrichroasters.com/sample.html

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    Re: large drum roasters, some stupid questions

    You know I reckon that roaster would be great to have just as a personal unit. These roasters are supposed to be very very good.

    The wish is there but other priorities are foremost.....

    I suppose theres nothing like dreaming is there

    FB

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    Re: large drum roasters, some stupid questions

    Quote Originally Posted by sharkboy link=1114520196/0#3 date=1114531644
    Ive been sketching too...
    I was wondering what size and shape to make the support arms (spokes) for the drum. I guess round pencil width spokes would be fine.
    Other drawings I have seen of "real" roasters use sheet metal (albiet heavy gauge) for the spokes.

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    Re: large drum roasters, some stupid questions

    wish Id taken inside pics on the weekend :-/

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    Re: large drum roasters, some stupid questions

    ...so do we!!! ;)

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    Re: large drum roasters, some stupid questions

    Thanks Sharkboy,

    Yea looks excellent, but I bet it costs a bomb.

    The design Im playing is basically a cross between that and a hottop sort of....

    many ideas.....goal is to put together a basic roaster for say $500-$1000. and the options etc.

    Eventually I post up the design for comments, then build one and test it.

    If all goes to plan Im may even start selling them, in kit form or completed.

    Time is my biggest enemy at the moment.


    Been meaning to find some time to load the pic of that sample roaster into my cad software and setup the scaling etc. to pull off the dimensions etc.

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    Re: large drum roasters, some stupid questions

    Just to make you horny, check this esthetic winner out:

    http://new.tonya.co.jp/Shelf/Goods/samroaster_e/

    We can debate the many cons, but crikey it looks good.

    Cheers

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    Re: large drum roasters, some stupid questions

    HV

    Ive since read that the Diedrich sample roaster costs $3800US *:o :(
    I dont think I want to know how much the Probatino costs...

    Check out these for ideas:

    www.coffeeper.com/CF/views.htm
    http://www.sweetmarias.com/prod.hottop.shtml
    http://www.coffeeshopsupply.com/gourmetroasters.html
    www.billiecafe.com/roaster_entry.html
    http://www.specialtycoffee.com/equipment/new/1/1/

    Wired

    That little roaster is fantastic. I didnt notice if there was a price but doesnt look that tough to reproduce... It is almost like a desktop roaster you could use at work :)

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    Re: large drum roasters, some stupid questions

    That little roaster is fantastic. I didnt notice if there was a price but doesnt look that tough to reproduce... It is almost like a desktop roaster you could use at work
    Or in the car on the way to work ;D
    Mounted to the dash... hooked-up to the LPG tank in
    the boot... and the 12v lighter socket model of course!

    (dont try this at home)

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    Re: large drum roasters, some stupid questions

    Reminds me of a Simpsons episode where homer completely surround himself with 12V appliances in his car....Espresso machine for the car....imagine grinding, tamping & pulling shots and steaming while on the highway.....

    Anyway back to drum roasters.

    Poundy,

    Thanks again to putting up the internal pics of you roaster, it given me some good ideas.
    Am I right in saying the burners under the drum heat both the drum and air drawn in at the sides of the roaster then up through the inside of the drum entering from the rear and exiting at the front top (also filling point) then across to the blower/sucker(turbo looking) and then into the flue?

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    Re: large drum roasters, some stupid questions

    blower/sucker(turbo looking)
    "Blower" was very close to the pin, tis a supercharger!

    A belt driven centrifugal supercharger ;D

    [hr]


    Errr.... now back to your other air circulation question....

    Poundy?

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    Re: large drum roasters, some stupid questions

    Quote Originally Posted by HV_MAN link=1114520196/0#12 date=1115285354
    Reminds me of a Simpsons episode where homer completely surround himself with 12V appliances in his car....Espresso machine for the car....imagine grinding, tamping & pulling shots and steaming while on the highway.....
    Thats where Super-Autos come in handy. :D Hhhmmm...maybe thats what I should do with my Cimbali M52. Mod it up and install it in my van for those mobile pulls when you just cant wait for your spresso fix. ;D ;D ;D

    Java "Mods are fun" phile

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    Re: large drum roasters, some stupid questions

    Quote Originally Posted by HV_MAN link=1114520196/0#12 date=1115285354
    Am I right in saying the burners under the drum heat both the drum and air drawn in at the sides of the roaster then up through the inside of the drum entering from the rear and exiting at the front top (also filling point) then across to the blower/sucker(turbo looking) and then into the flue?
    OK, so from my "remote" view and understanding, the way it all works is very close to this.

    Gas heats drum directly and the air below/around the drum.
    Hot air enters the drum from the perforated rear panel in the drum.
    Hot air flows through the beans and to the front of the drum, then up the part at the front that couples as the bean loading chute, and either out the top or along the top tube to the rear/turbo, then into the cyclone.

    The top tube has a gate on it, to restrict flow through it (and hence thru the entire drum/bean mass). With that shut, only a small amount of airflow occurs (convection up the tube and a small amount around the bean release gate) and the bean take most of their heat from the drum surface - really slowing down their roasting progress (that was another major mistake I made early on, not having that open to start with and along most of the roast).

    hope this helps.

  17. #17
    ed_vinas
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    Re: large drum roasters, some stupid questions

    Quote Originally Posted by poundy link=1114520196/15#15 date=1115374850
    Hot air flows through the beans and to the front of the drum, then up the part at the front that couples as the bean loading chute, and either out the top or along the top tube to the rear/turbo, then into the cyclone.
    Next question.....what does the cyclone do and how does it work?

    Cheers
    Ed

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    Re: large drum roasters, some stupid questions

    the idea is that the husks / chaff are carried up and out of the drum with the airflow, and spat into the cyclone at a tangent. Air flows around, slowing down, chaff drops out and down into the bottom of the cyclone. Gathers there to be taken out a hatch and composted...

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    Re: large drum roasters, some stupid questions

    Behmor Coffee Roaster
    ...or to make a really nice, warm bed for your pet rat.

    (I hope that rat didnt follow from the last place!)



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