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Successful first 2 roasts

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  • Dimal
    replied
    Re: Successful first 2 roasts

    Originally posted by gronk62 link=1222586752/60#62 date=1224144241
    I live round the corner from my Bros dairy farm and have unlimited access to mountains of stainless steel junk from the cow shed hes discarded over the years.
    Sounds like tinkerers heaven mate....

    Mal.

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  • PhilMac
    replied
    Re: Successful first 2 roasts

    Hi Gronk,

    I have the same setup as you, the BB280, Ryobi variable gun etc, but use a thermocouple to output to a PC. It gives a result like this when converted to an excel file.



    I do 300g batches which reduce to 250g after roasting. Anything smaller doesnt seem to move the beans around consistently. I havent done more so cant help you there, but this amount works for me. I start the gun off with the lights showing 200C and leave it at that for about a minute and then nudge it up just a little - maybe 3 of the little notches, then do this again every 45 secs or so as the roast progresses, increasing every 30 secs or so towards FC, and the heat gun is showing as being on the hottest setting, but there would be more to go on the dial.

    As FC happens, I turn back the heat to 500 and turn the pedestal fan to a higher setting, which slows the roast right down, then keep going to however far you want to take the roast.

    I really rely on the graph on the laptop, as it shows what is happening.

    Cheers

    Leave a comment:


  • gronk62
    replied
    Re: Successful first 2 roasts

    Originally posted by Mal link=1222586752/40#53 date=1224058862
    Could be the go G62....

    You might be able modify the stirring paddle to some extent so as to displace a greater volume of beans with each rotation... Maybe weld a short piece of stainless to increase the height of the paddle near its periphery so as to replicate a reversed L. Might be worth trying... :-?

    Mal.
    Oops, sorry Mal. I somehow missed your post. :-[

    I dunno about welding a piece on, but I could bolt something on. The paddle is made outa teflon coated aluminium (I think). I live round the corner from my Bros dairy farm and have unlimited access to mountains of stainless steel junk from the cow shed hes discarded over the years.

    Leave a comment:


  • gronk62
    replied
    Re: Successful first 2 roasts

    Originally posted by Thundergod link=1222586752/60#60 date=1224070950
    Where you point the heatgun can help or hinder the flow of the beans.
    Yeah I wondered about that too. I point it at the opposite side.

    Leave a comment:


  • Thundergod
    replied
    Re: Successful first 2 roasts

    Where you point the heatgun can help or hinder the flow of the beans.

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  • gronk62
    replied
    Re: Successful first 2 roasts

    Originally posted by Dennis link=1222586752/40#58 date=1224067212
    OK, so sounds like you really need to get a lot more agitation happening Phil.  

    As a quick fix, maybe you could try clipping a few big bulldog clips onto the paddle, once youve scorched the paint off them with your heatgun?  You could try this before starting a roast to see if it makes a difference.
    The agitator works ok with the 500g batches, but the beans "mix" kinda slowly. They swooshed around a bit faster in the smaller batches.
    Ill check through my boxes of junk to see if I have some of those bulldog clips.

    My local jaycar is only a small one and dont carry much stock so they need to order everything in which sometimes takes ages. Ill make the trip to a proper jaycar store soon and pick up a thermocouple. That should help me to stop second guessing the temp.

    Leave a comment:


  • Dennis
    replied
    Re: Successful first 2 roasts

    OK, so sounds like you really need to get a lot more agitation happening Phil.

    As a quick fix, maybe you could try clipping a few big bulldog clips onto the paddle, once youve scorched the paint off them with your heatgun? You could try this before starting a roast to see if it makes a difference.

    Leave a comment:


  • gronk62
    replied
    Re: Successful first 2 roasts

    Originally posted by Dennis link=1222586752/40#56 date=1224063594
    Hi Phil, although the roast results sound a bit erratic, that aside, does this still happen when you adjust your grind?  I only ask because I know the mazzer is a fairly recent addition to your kit, and even half a notch can make a significant difference with this grinder.

    Cheers!
    Gday Dennis

    Yep Ive tired a whole swag of different grind settings from so fine as to stall the pour, to too course. Adjusted tamp, and dose.
    I really didnt have any trouble before the 4th roast. I used the mazzer for a little while before the 4th roast and had no trouble dialling it in.

    Im about 99% convinced Ive screwed my roasts up and this is the main problem. If you could see what they look like in person youd agree they are very uneven.

    I went into the local coffee boutique today where I used to buy my beans from and checked out the beans colours in their hoppers. 99.9% looked the same colour in any given batch.
    Mine go from dark tan through to black and Im sure that cant be good for producing nice espresso. The wildly varying degrees of roast would surely produce uneven extraction between grounds.

    Ill go back to square 1 when I get my next order of green beans and do some small, and hopefully more even roasts to see if that gets things sorted  

    Leave a comment:


  • Dennis
    replied
    Re: Successful first 2 roasts

    Hi Phil, although the roast results sound a bit erratic, that aside, does this still happen when you adjust your grind? I only ask because I know the mazzer is a fairly recent addition to your kit, and even half a notch can make a significant difference with this grinder.

    Cheers!

    Leave a comment:


  • gronk62
    replied
    Re: Successful first 2 roasts

    Originally posted by Stan link=1222586752/40#54 date=1224061616
    Some beans do roast unevenly (not all).  Hope this helps
    All info helps us noobs

    Trial and error is a good way of learning, up to a point.
    Ive been stumped as to why my pours went pear shaped all of a sudden. Up till my 4th roast I rarely pulled a crappy shot. Always had pours that flowed like honey and were Guinness to the bottom.
    Blonding rarely started before the 20 second mark.

    Now my pours are dark liquid for a few seconds, a few seconds of tiger stripe good stuff and then runny blonde bilge.

    Oh well, Ill get it sorted eventually :-[

    Leave a comment:


  • Stan
    replied
    Re: Successful first 2 roasts

    The tipping (burning) indicates you have your heat gun to close when you are starting the roast. I got this in a few roasts and I now have backed the gun off a little at the start of the roast, this stopped the tipping. As I said earlier, all my roasts are 550gms initially. Some beans do roast unevenly (not all). Hope this helps

    Leave a comment:


  • Dimal
    replied
    Re: Successful first 2 roasts

    Could be the go G62....

    You might be able modify the stirring paddle to some extent so as to displace a greater volume of beans with each rotation... Maybe weld a short piece of stainless to increase the height of the paddle near its periphery so as to replicate a reversed L. Might be worth trying... :-?

    Mal.

    Leave a comment:


  • gronk62
    replied
    Re: Successful first 2 roasts

    Originally posted by Mal link=1222586752/40#41 date=1223037804
    Gday again G62...

    Seems that a "safe" maximum load for a BM lies within the range of 65-75% of the maximum loaf size the BM is designed for. BMs with horizontal pans seem to be at the higher end of the range while BMs with vertical pans are at the lower end. The main determiner is related to the agitation of the quantity of beans being roasted, as poor agitation will lead to uneven roast batches and resulting poor quality brews. Its a bit suck and see really as all BMs seem to vary in the way they agitate the beans.


    Cheers mate,
    Mal.
    Hmmm... I think my questions may have been answered here.

    The first 3 roasts I did were all small batches and roasted very evenly in that all the beans looked about the same colour.

    My blonde gusher problems http://coffeesnobs.com.au/YaBB.pl?num=1223625183 started with the 4th roast which was a full bag (500grams I think. Havent got any scales) and it was very uneven.
    The 5th roast was better but still uneven and Im still having problems with early blonding.

    I roasted my 6th roast today which I left a bit too long and the beans are a touch oily. It is also a VERY uneven roast with bean colour varying between about CS6 right up to burnt.

    Im almost convinced that my batch size is causing some problems as the beans dont agitate as well as Id like them to.

    I think Ill go back to smaller batches around 250 - 300 grams to try and get some evenness back.

    Gettin a bit tired of wrestling with blonde gushers  :-/

    Leave a comment:


  • Stan
    replied
    Re: Successful first 2 roasts

    I already have my fan on the highest setting. So I have to adjust the Heat Gun. :-[

    Leave a comment:


  • PhilMac
    replied
    Re: Successful first 2 roasts

    Originally posted by Stan link=1222586752/40#45 date=1223107898
    I leave the lid open but I have a higher ambient air temp up here.  The only thing you have to watch is usually just after First Crack you can get a surge in the temperature.  I just lift the HG and little until the temp. stabilizes.....
    I try to remember to turn the fan up a higher speed at FC, as it helps reduce the heat gradient.

    Cheers

    Leave a comment:

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