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Thread: Im building a bbq roaster! a few questions:

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    Im building a bbq roaster! a few questions:

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hey guys, Im in the process of building a bbq roaster. I have the barrel pretty well sorted, and I want to find something to rotate the drum, and a shaft. I am wondering if a stock rotisserie would suffice? I saw one in kmart for $90, and it had a 5 kg limit. My drum at the moment, weighs less than 2kg, and I intend to roast 1-2kg of beans at a go. How fast will the rotisserie rotate? fast enough? what are other options? Any advice?

    Barrel measures 25cm diameter, and 36cm long.

    Cheers, Mark



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    Re: Im building a bbq roaster! a few questions:

    Quote Originally Posted by MachoSilvia link=1184282680/0#0 date=1184282679
    Hey guys, Im in the process of building a bbq roaster. I have the barrel pretty well sorted, and I want to find something to rotate the drum, and a shaft. I am wondering if a stock rotisserie would suffice? I saw one in kmart for $90, and it had a 5 kg limit. My drum at the moment, weighs less than 2kg, and I intend to roast 1-2kg of beans at a go. How fast will the rotisserie rotate? fast enough? what are other options? Any advice?

    Barrel measures 25cm diameter, and 36cm long.

    Cheers, Mark
    Hi Mark- Great idea, but alas too slow. Aim for about 20 RPM...Brett (AKA fatboy) is a resident CS BBQ roaster. I think he uses a windscreen wiper motor and suitable power source...

    Good luck!

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    Re: Im building a bbq roaster! a few questions:

    cheers, thats what I suspected, I think I will look for a windscreen wiper motor, shouldnt be too hard to find...

    Cheers, Mark

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    Re: Im building a bbq roaster! a few questions:

    Mark,

    As Chris said, I use the windscreen wiper motor.
    The one I was given had a nut that was originally attached to the wiper assembly. This nut spins continuously (in one direction) when 12V power is connected. I attached a socket from a cheap set over the nut and the reverse fits nicely over the rotisserie rod (BBQ galore, mutli-part rod).

    Once I was happy with the method, I superglued the socket onto the nut.

    My motor has been going since 2004 doing an average of at least 1 roast a week. Ill be devastated when it dies. I suppose I should organise a backup one day ;-)

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    Re: Im building a bbq roaster! a few questions:

    Hi MachoSilvia,

    My BBQ roaster is considerably smaller than what youre putting together (see http://coffeesnobs.com.au/YaBB.pl?num=1180848792/0), it runs at 12 RPM using a BBQ rotisserie with very consistant roasts. *However, as others have suggest, I doubt a standard BBQ rotisserie would provide a high enough RPM for a consistant roast with your larger drum.

    Jaycar sell some nice little, high torque motors that Ive been considering as I find the BBQ rotisserie a little on the loud side (its what I had so didnt cost me anything...):

    YG-2734 - 12.0kg/cm - 4.5-18Volt - 36 RPM - $19.95 (From current catalogue - other higher RPM models available).

    They also sell some nice little shaft couplers that would match the motor.

    Might be worth looking at for yours?

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    Re: Im building a bbq roaster! a few questions:

    Quote Originally Posted by fatboy link=1184282680/0#3 date=1184287172
    Mark,

    As Chris said, I use the windscreen wiper motor.
    The one I was given had a nut that was originally attached to the wiper assembly. This nut spins continuously (in one direction) when 12V power is connected. I attached a socket from a cheap set over the nut and the reverse fits nicely over the rotisserie rod (BBQ galore, mutli-part rod).

    Once I was happy with the method, I superglued the socket onto the nut.

    My motor has been going since 2004 doing an average of at least 1 roast a week. Ill be devastated when it dies. I suppose I should organise a backup one day ;-)
    Nah Brett, just call the RACV

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    Re: Im building a bbq roaster! a few questions:

    Cheers guys, btw what rpm does the wind screen wiper motor spin at? and what 12 volt power supply do you use? does it need a transformer? I checked out that motor on jaycar, and it looks perfect! Thanks mylesau, looks like itll either be that motor, or a wiper motor from a car wrecker... Fatboy, where did you get your motor from?

    Thanks once again, im going over to a friends place now to get the shaft (12mm threaded steel rod) mounted throug the centre of the barrel...

    Cheers, Mark

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    Senior Member robusto's Avatar
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    Re: Im building a bbq roaster! a few questions:

    Have fun assemblying MachoSilvia.

    Yes, the windscreen wiper motor is 12v dc so does require a transformer to step down 230v AC.

    Transformers capable of handling at least one amp are costly, but you can probably pick one up for nothing from a discarded computers power supply. The leads are 5v dc and 12v dc. A little on the bulky side though.

    Alternatives are: a 12v car battery. A charger for a 12v car battery.
    Power supply for a 12v television (they are usually over 1 amp).

    I have one concern about your drum: It doesnt appear perforated. That could increase the roasting time and tend to bake the beans rather than roast them. Especially depending on what barbecue you use and how close to the burner the drum sits.

    It takes my set up about 15 minutes to roast about 400 grams. That is with the lid closed and all burners on maximum.

    -Robusto

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    Re: Im building a bbq roaster! a few questions:

    Mark,

    My motor was given to me by a friend who does up cars. I was boring him silly with my plans for a BBQ roaster back in 2004 and asked him the best place to get a wiper motor. He said the wreckers and then said, "Hang on". Went out to his shed and came back with one.

    I think mine spins at around 50rpm.

    I use a 12V battery charger to power mine. Just plugs into mains, has a red and black clamp which goes to the 2 wires on the motor. On mine, if I get them the wrong way around, the motor spins the other way. Probably not good for it and has the added problem of unscrewing my multi-part rod, so I make sure I get them the correct way around.

    I do ~700g green down to ~500g roasted per roast.

    Brett

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    Re: Im building a bbq roaster! a few questions:

    I have seen different designs of drum roasters, some are perforated, some are not... im not sure what the implications are, better or worse, but I am sure the design is workable. I went to jaycar, and saw exactly the motor mylesau recomended, and It is on my shopping list this week, with a little brass addapter, to attatch onto a 6mm threaded steel shaft, which will have the barrel mounted on. more pics to come, along with progress! :D

    cheers, Mark

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    Re: Im building a bbq roaster! a few questions:

    The roaster is now working! sorry I havent been posting on this thread, Ive documented the process on my blog, here...
    http://in.lits.gen.nz/modules/journal/journalview.php?space_key=1&module_key=8&journal_u ser_key=5

    So here it is:

    I havent yet tested the capacity,; my test roast was 1.2kg of yergacheffe, which took 30 min... I know this is too long, I will find a way to speed up the heating of it, to bring the second crack to between 17 and 22 minutes... I might make this longer for the sumatran I have, as this tends to like longer roasts.



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    Re: Im building a bbq roaster! a few questions:

    and...


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    Re: Im building a bbq roaster! a few questions:

    and...


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    Re: Im building a bbq roaster! a few questions:

    Great Job MS 8-),

    Whered you get that neat little gearbox from, its a little beauty :)....

    Mal.

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    Re: Im building a bbq roaster! a few questions:

    Thanks Mal, my friend who helped build (most of) it had friends in many industries, and when he asked around, was given the gearbox by a carpet manufacturer, which fitted perfectly for my purposes, and it holds the whole barrel itself, with no need for another bearing.

    Cheers, Mark

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    Re: Im building a bbq roaster! a few questions:

    Great neat work, MachoSilvia.

    I guess to speed things up youll have to either use a perforated drum, or build a shroud around the existing solid one.

    Even a barbecue lid would go a long way toward heat retention.

    --Robusto

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    Re: Im building a bbq roaster! a few questions:

    Yes, I am working on building a tin shroud around it (so thats what its called!)... Also, by lowering it an inch, and sucking air through, creating a flow of air, has made a 23 minute roast... Very tasty indeed! I really like the mellower flavor compared with the popcorn roaster! Havent done regourous testing yet, but I am looking for heavier bodied shots, by drawing out longer roast times on the sumatra mandheling. More coffee ahead!

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    Re: Im building a bbq roaster! a few questions:

    Well I just had a did a fantastic batch today, Sumatra Mandehling and Ethiopian Yergacheffe, 2 parts sumatran and 1 part Yergacheffe... The photo below is of the post roast blend of the two beans:


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    Re: Im building a bbq roaster! a few questions:

    Here are the bags of my secret blend (you cant read the pencil writing in the photo- thats what it says) In a few days it will be ready for testing! Im now getting consistently even roasts, which is getting lovely consistent results (funny that)...

    Cheers, Mark


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    Re: Im building a bbq roaster! a few questions:

    Kicking off a Boutique Roastery there Macho? Looking very professional indeed... 8-)

    Mal.

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    Re: Im building a bbq roaster! a few questions:

    Why the paper type bags??

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    Re: Im building a bbq roaster! a few questions:

    Wow, I havent been here in ages! first a thanks to everyone whos participated on coffee snobs particularly in the roasting forums, Ive since upgraded the insulation with some automotive heat shield, and hinged the entire mechanism to the bbq so it can be tipped up and emptied easir. Ive also bought new bags, the paper ones ran out and these ones werent much more.


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    Re: Im building a bbq roaster! a few questions:

    [img]C://Documents and Settings//ADMIN1//Desktop//Image00038.jpg[/img]


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    Re: Im building a bbq roaster! a few questions:

    [img]C://Documents and Settings//ADMIN1//Desktop//Ima[/img]


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    Re: Im building a bbq roaster! a few questions:

    Quote Originally Posted by Mal link=1184282680/0#19 date=1196485644
    Kicking off a Boutique Roastery there Macho? Looking very professional indeed... 8-)

    Mal.
    I had a laugh cheers Mal, :P I am selling to friends and family, just a few kilos a week, but I emphasize that I come here as a like minded coffee snob who just wants to improve what he drinks with breakfast with this fanstastic resource here, as a contributer as well as benifactor of information.

    Happy to answer any questions about my roaster.

    At the moment Im taking my roasters to the first crack (175 C) at around 10 min, sit around there for 2-3 min, then ramp up the heat to reach 200 C at about 15 min-16 min, sit there another 2 min, then increase the heat and stop it when it looks like the right colour.

    CHeers, Mark

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    Senior Member ozscott's Avatar
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    Re: Im building a bbq roaster! a few questions:

    Mate - very flash - have you got a roast profile from the DMM that you could post up to let us all see how it profiles...? Also how do you control the roast, particularly from bean to bean.

    Cheers

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    Re: Im building a bbq roaster! a few questions:

    Hi, I think this is a great looking roaster. Im thinking of trying to make something similar. A couple of questions!

    1. What do you have supporting the drum? It looks like you have all the weight hanging on the gearbox?

    2. When you say sucking air through, how have you acheived that?

    Thanks!

    Damian.

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    Re: Im building a bbq roaster! a few questions:

    Gday, sorry for the absence... too much drinking coffee, not enough snobbing coffee...

    I havent managed to get a profiler yet, but a few land marks which I go for is
    5-6min 100C
    10-12min 175C (first crack, I lower the gas and sit the temp here for about 2min)
    15-17min 200c (second crack starting, I lower the gas and let the temp sit hsit here for a min or two)

    then put gas up high again till the end, stopping it when I feel like it around 18-21min. (longer roasts are working well at the mome.


    Yes, the gear box takes all the weight. does A mighty good job too! its very tough. from and old carpet machine, dont know how many are lying around...

    And I have a desk top fan with a vacuum cleaning pipe suckking air from the roaster for air flow.

    Cheers, Mark


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    Re: Im building a bbq roaster! a few questions:

    As for controling the Roast, I just turn the gas knobs on the bbq, depending on what my multimeter thermocouple is telling me. turning temp down befor first crack and second, and keeping the gradient steady the way up.

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    Senior Member redzone121's Avatar
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    Re: Im building a bbq roaster! a few questions:

    Still doing 1.2kg of green MS?

    Chris

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    Re: Im building a bbq roaster! a few questions:

    Excellent design, I like it. Now only if you could hook it up to an electric circuit for a more controlled roast..

    Also judging by the pictures (I cant see it on them) where can you actually see through the drum to the beans?

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    Re: Im building a bbq roaster! a few questions:

    Hey there, yeah im doing 1.25kg batches, it soles 20% of mass to net 1kg +-30-40g, so its pretty good. I have yet to gear up the output so i can possibly do larger batches, at the moment it is not fast enough to keep more beans moving enough.

    I have a aluminium trier, which i poke in to get a visual sample for nearer the end of the roast.

    what kind of electric circuit do you mean? what would it control?

    Cheers, Mark

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    Re: Im building a bbq roaster! a few questions:

    1.5kg batches now! which yields 1.2 kg of net coffee.

    Just thought Id say!

    Im now trying to build a cooler with a box fan.

    Any tips?

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    Re: Im building a bbq roaster! a few questions:



    Quote Originally Posted by 04282A21261A20253F2028490 link=1184282680/32#32 date=1265919108
    Im now trying to build a cooler with a box fan.

    Any tips?
    An exhaust fan is more versatile

    http://coffeesnobs.com.au/YaBB.pl?num=1222303036/21#top

    KK

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    Re: Im building a bbq roaster! a few questions:

    Quote Originally Posted by 173B3932350933362C333B5A0 link=1184282680/32#32 date=1265919108
    1.5kg batches now! which yields 1.2 kg of net coffee.

    Just thought Id say!

    Im now trying to build a cooler with a box fan.

    Any tips?
    Ha ha im chasing you! lol

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    Re: Im building a bbq roaster! a few questions:

    This looks like what I want to build! Thinking of using an old 4.5kg gas bottle cut up as the inner drum.

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    Re: Im building a bbq roaster! a few questions:

    Behmor Coffee Roaster
    Quote Originally Posted by 63676D666B62516D0E0 link=1184282680/35#35 date=1265971978
    This looks like what I want to build! *Thinking of using an old 4.5kg gas bottle cut up as the inner drum. *
    I have just started building a bbq based roaster at home, the thought of using a gas bottle crossed my mind a few times, but decided against it, as they have been used to hold a poisonous substance.



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