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Thread: The Ideal Batch Size

  1. #1
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    The Ideal Batch Size

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

    This is a chance to find out what other CSers thoughts are on batch size.

    Grant

  2. #2
    CoffeeSnobs Owner Andy's Avatar
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    Re: The Ideal Batch Size

    Good idea Grant. :)

    I voted for 400-700.... I currently roast 700gm batches (green weight) and find myself roasting once a week or fortnight and doing 2-3 batches in a row.

    About a kilo a week seems to be my consumption... well not just me! Wife, vistors, work-mates etc all love the home roasted specialty coffees! (they love em more so if someone else roasts them!!!!) ;)

    I could live with a 300gm roaster (would be about 250gm roasted) if it was quiet, small and easy to use/clean.

    It would need to work like a toaster... insert beans, press GO and come back to find perfectly roasted, cool coffee beans.

    ...oh yeah, it would have to cost about $50 :o

  3. #3
    Senior Member robusto's Avatar
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    Re: The Ideal Batch Size

    This is a personal matter largedly dictated by household consumption. Fresh beans is the aim, so small quantaties are preferable to roasting enough to last a month. My aim is four days worth = 200 grams. Divide that by the different varieties to be blended, and that would be close to ideal batch size. Or, mix them first and roast all at once, which, in that case, translates to a 200 gram capacity.
    (I notice a few of us posting at this ridiculous hour. Either too much caffeine of the London bombs have kept us awake)

  4. #4
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    Re: The Ideal Batch Size

    I tend to roast 3-4 batches of 250g every fortnight. This gives me 4 beans to blend espresso, plus I take a little in to work to use in a plunger. Its not optimal for freshness, but keeping the excess in the freezer is a good enough compromise for me.

    Id like atleast a 500g roaster, if not 1kg, purely because Im at my limit now, but find Id like to be roasting more sometimes to give as gifts. Also it would be nice, if time was short one weekend, to preblend and then just roast a single large batch. Also you can always add less beans to a large roaster, but not more to a small roaster.

  5. #5
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    Re: The Ideal Batch Size

    Andy,

    Mmm. Yes, it has had some good response so obviously a topic that is of interest. It also shows peoples drinking habits or maybe their generosity to friends. :)

    I voted 100 - 150g. I like to roast smaller batches then blend them. I also like decaf. Well, not really, but I like to sleep at night and the decaf means I can have a coffee before going to bed.

    Grant

  6. #6
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    Re: The Ideal Batch Size

    Obviously a roaster with a large batch size should be able to roast anything smaller. So a 1kg roaster should also be able to roast 100g, shouldnt it? Here is one that can go from 50g to 2.7kg, but alas, Andy, it costs a little more than $50.

    http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&category=20671&item=4392687 243&rd=1&ssPageName=WDVW

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    Re: The Ideal Batch Size

    My current heat gun batch size is 300g. This works out to be 250g roasted and fits nicely into the valved bags. This afternoon I roasted 3 batches and in about 20 minutes Im going to roast 2 more.
    Ideally Id like a drum sample roaster style setup, that is capable of roasting anything from 200g to 1500g.
    I bought what could be the basis of a drum this afternoon. It seems like 700g would be a maximum load. Could be way off, but Im working the operating capacity being equal to 33% of the drums volume. Anybody confirm if this is an appropriate ratio?

  8. #8
    Mal Dimal's Avatar
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    Re: The Ideal Batch Size

    Hi sharkboy,

    I think workable volumes depend a lot on the rolling depth of the bean mass in the drum. This depth is most likely a relative constant in relation to the diameter of the drum itself and the heat transmission from the heat source to the beans themselves.

    Im not too sure how you work this out and arrive at an optimum drum size... diameter and length, though. Obviously, the shorter the length of the drum for the same mass of beans, the deeper will be the rolling bean mass. There will probably be a point where the depth will exceed the point at which all beans in the mass are exposed to the same quantity of heat that will in turn allow for even roasting. In all probability, the longer the drum that can be accommodated in your BBQ, the better you will be able to manage the progress of the roast and the more even the roast will be for a given bean mass.

    In the end, I dont think it will come down to a nominal percentage of the diameter of the drum but will more likely be a combination of the length and diameter to ensure that the bean rolling depth doesnt become excessive. Sounds like a job for that team we all know and love... Trial and Error. ;D
    All the best,

    Mal.

  9. #9
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    Re: The Ideal Batch Size

    Thanks for the thoughts Mal.

    Why is it that I always end up playing the part of error... :(

    :)

    -Stephen-


  10. #10
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    Re: The Ideal Batch Size

    I typically roast around 500gms a week, although it can be triple that if we have a big dinner party and other visitors.

    The poll itself is a bit limited for me because although Id like to be able to roast bigger batches (I chose 250-400gm) Id also like to be able to do small batches.

    Unfortunately all the domestic roasting machines Ive seen have a sweet spot in batch size so if you go too small in batch size you get a different roast profile than a normal HOTTOP batch of around 250gm.

    If I could do 100-500gm in one roaster with push button automation Id be in coffee heaven as I could do some small speciality roasts for espresso drinking for myself and larger standard SO and blend batches for the majority of white coffee drinkers I tend to get visiting.

  11. #11
    Mal Dimal's Avatar
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    Re: The Ideal Batch Size

    Behmor Coffee Roaster
    Quote Originally Posted by Wired link=1120737252/0#9 date=1121035465
    If I could do 100-500gm in one roaster with push button automation Id be in coffee heaven as I could do some small speciality roasts for espresso drinking for myself and larger standard SO and blend batches for the majority of white coffee drinkers I tend to get visiting.
    Hi Wired,

    Dont know about the "Push-Button" operation but I guess it could be done.... The StirCrazy/Turbo Oven option would come close to addressing the main issue, that of a widely varying batch size capability from what Ive been able to glean from Net searches.

    Maybe you could commission a fellow CS member to make one for you and add in the P/button control? No harm in asking...

    Cheers,
    Mal.



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