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Thread: Second Failed Roasting Attempt

  1. #1
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    Second Failed Roasting Attempt

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi all. Just had another attempt after a previous failed (first) attempt at roasting with BM and HG. The details are: Breville BM, Bosch HG (variable temp control). Beans were Sumatran Mandheling, 450g. Ambient temp was 20C and breezy. I had the HG set at fastest fan III and temp of 230C and held it about 5 inches (12cm?) from the beans. After 20 mins the beans had hardly changed colour, so I moved the HG to about 5cm from the beans. After another 10 mins the beans had changed to a very light brown (about 3 on the CS card scale). Just then, the BM stopped, having overheated. The first attempt was the same scenario.

    So what am I doing wrong? Is the ambient temp too low? Should I start with less beans, about 125g? Any help would be appreciated.

    Andrew.

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    Re: Second Failed Roasting Attempt

    " ... and temp of 230C"

    Is that the temp setting you used on the HG? If so, its too low.
    My cheapie Ryobi is 600C and gives an early SC roast in 12 to 15
    minutes (getting longer as I get practice).

  3. #3
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    Re: Second Failed Roasting Attempt

    Hey Ajayro ...

    From the perspective of someone on the same Corretto learning curve, Ill give my humble take on your experience.

    1) Sumatrans, from my experience, like a slower initial roast with heat incrementally raised to achieve FC about 12mins, then slowed big time for SC about 18mins (rolling);

    2) I reckon your fast heat (Bosch III) was too an intense heat to begin with, yet at 5 inches from the greens, not close enough! Lower the gun to 1-2 inches from the surface of the agitated rolling geens, & start on Bosch I, then ramp the temp gradually (oh, & if pedantic, get a temp probe DMM with stopwatch to give you readings until you get a bit more confident with watching purely the beans for transitional roasting profiles);

    3) Read this as a further helpful guide: http://www.sweetmarias.com/roasting-VisualGuideV2.html

    Cheers,
    Tony


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    Re: Second Failed Roasting Attempt

    Quote Originally Posted by ajayro link=1195560330/0#0 date=1195560330
    Hi all. Just had another attempt after a previous failed (first) attempt at roasting with BM and HG. The details are: Breville BM, Bosch HG (variable temp control). Beans were Sumatran Mandheling, 450g. Ambient temp was 20C and breezy. I had the HG set at fastest fan III and temp of 230C and held it about 5 inches (12cm?) from the beans. After 20 mins the beans had hardly changed colour, so I moved the HG to about 5cm from the beans. After another 10 mins the beans had changed to a very light brown (about 3 on the CS card scale). Just then, the BM stopped, having overheated. The first attempt was the same scenario.

    So what am I doing wrong? Is the ambient temp too low? Should I start with less beans, about 125g? Any help would be appreciated.

    Andrew.
    Hiya Andrew - I also use the Bosch variable control HG (with digital temp on rear) - its a ripper! *On first read however, it would appear that your temp setting seems way too low - remember, the beans are supposed to end up at around the temperature you mentioned, so you have give them a significantly higher roast temp to get them there (otherwise, you run the risk of baking them instead!)

    Depending on the temp of the day, my typical roast pattern (when roasting 600 gram batches) is as follows:
    - Beginning temp setting 500-520 degrees
    - Beginning fan speed - 3 (max)
    - Nozzle between level (cooler days) up to 1-2 cm above the edge of the bread pan (warmer days)

    At first crack (usually b/w 10-12 minutes), I usually back off the fan speed (back to 2). and drop the temp to ~470 (again, +/- 10 degrees depending on the weather) and this usually gives me a continued but gradual ramp up (for another ~ 6 minutes) to second crack. *If its a hot day (ambient at 30 degrees +), Ill also raise the nozzle too after FC to prevent the roast from running away from me (have learned that the hard way! *:-[)

    Try give this (or something near it) a whirl and let us know how you get on!

    Best of luck!

    -A-

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    Re: Second Failed Roasting Attempt

    So thats where Ive been going wrong! From all the posts Ive read, I thought the beans should be around 230C. But I didnt realise that I had to blast them at a higher temp to raise their core temps.

    Thanks for your help guys. Yes, Alchemist, the Bosch HG is a ripper! The three fan settings and the "dial-in" heat settings are great. Only that I havent been using it correctly....doh! I will follow your routine and will let you know how I fare. Cheers!



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    Re: Second Failed Roasting Attempt

    Quote Originally Posted by ajayro link=1195560330/0#4 date=1195570053
    I will follow your routine and will let you know how I fare. Cheers!

    ...with pics - luuurve pics of freshly roasted beans!!!*;)

    Cheers,

    -A-

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    Re: Second Failed Roasting Attempt

    Hi Andrew

    You mentioned that your BM stopped due to "overheating". Are you sure it just didnt come to the end of its cycle?

    It might be an idea to give the BM a dry run & see how long it agitates for!

    Regards
    Andrew

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    Re: Second Failed Roasting Attempt

    Quote Originally Posted by Secksy link=1195560330/0#6 date=1195637035
    Hi Andrew

    You mentioned that your BM stopped due to "overheating". *Are you sure it just didnt come to the end of its cycle?

    It might be an idea to give the BM a dry run & see how long it agitates for!

    Regards
    Andrew
    Hi Andrew

    Thats a good point. The display showed an error number, but I didnt note which one. I was starting to wonder if it had just run out of time. After all, it agitated for about thirty minutes. I will try it again in the next few days. Thanks.

    Andrew.

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    Re: Second Failed Roasting Attempt

    Quote Originally Posted by ajayro link=1195560330/0#7 date=1195639706
    I was starting to wonder if it had just run out of time. After all, it agitated for about thirty minutes. I will try it again in the next few days.
    My BM goes for 23 mins. *You should find 30 plenty of time for a decent roast *8-)

    Andrew

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    Re: Second Failed Roasting Attempt

    Yes, 30 minutes will be ample when I do it correctly next time. :-[


    Off topic, there seems to be a lot of Andrews on this forum. *8-).

    Cheers, Andrew.

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    Re: Second Failed Roasting Attempt

    ... and just to check,,, your BM isnt heating at all is it?

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    Re: Second Failed Roasting Attempt

    No, it isnt heating, as I use it on the dough cycle.

    I still havent had a chance to attempt another roast. Will give it a go in the next couple of days and will post my results. And pics (for Alchemist). Cheers.

  13. #13
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    Re: Second Failed Roasting Attempt

    hi ajayro...

    on most BMs, if you are running a dough cycle, there is a fair chance that the heating element IS programmed to kick in to heat the bowl, but only to a luke-warm temp.... it does that to warm the dough so it rises better.
    if your BM cuts out well before 25-30 min kneading time could it be that the temp sensor interferes with the running time as it feels the bowl is getting too hot for a dough-cycle :-?


    L

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    Re: Second Failed Roasting Attempt

    to smart for itself! :(

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    Re: Second Failed Roasting Attempt

    If thats the case you could move the temp sensor probe away from the bowl.

    Dont disconnect it, when I did that to mine it refused to start as it sensed the disconnection.

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    Re: Second Failed Roasting Attempt

    Lizzi, you may be right. Ive just read the manual (why didnt I do that before?) and the dough cycle lasts for 1.5 hours. I dont know if the element has heated up, but the temp sensor has obviously detected the heat from the bowl, and turned the machine off. *I will try what TG has suggested and move the sensor away from the bowl. When I have time, I will try another roast and will post my results.

    Thanks everyone. Andrew.

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    Re: Second Failed Roasting Attempt

    Well, its been quite a few weeks since my last attempt at using a BM and HG, but yesterday I finally had the time and the inclination. I thought I would try the Indian Chikmagalur A beans from the last BeanBay, so I weighed out 600g and carted everything outside.

    I followed Alchemists instructions pretty much to the letter. Put the HG on 520C and the fan on III (max). First crack came after about 12 minutes. I then turned the heat down to 470C and the fan to II. After 6-7 minutes SC started, so this is where I stopped the roast. Cooled the beans down using the two-colander method until they were cool enough to touch and then spread them over a pizza dish.

    So, hallelujah, it worked!! I now have about 500g of beautifully roasted beans (about 7-8 on the CS card scale). Thanks again all, especially Alchemist, as I will definitely do this again. The only thing I will do differently next time is to use a fan to blow away the chaff. I almost drowned in the stuff (the Chikmagalur certainly produces heaps)!

    BTW, I took some photos with my mobiles cam, but theyre pretty crappy.



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    Re: Second Failed Roasting Attempt

    Quote Originally Posted by ajayro link=1195560330/15#16 date=1200411027

    So, hallelujah, it worked!! I now have about 500g of beautifully roasted beans (about 7-8 on the CS card scale). Thanks again all, especially Alchemist, as I will definitely do this again. The only thing I will do differently next time is to use a fan to blow away the chaff. I almost drowned in the stuff (the Chikmagalur certainly produces heaps)!
    In the words of the omnipotent Homer Simpson - WOO HOO!!! *[smiley=tekst-toppie.gif]

    Thats great news Ajayro. *Sounds like youre well on your way and Mate yes, a fan is a great way to overcome the Winter Wonderland appearance from all the settling chaff *:) not mention helping to keep the HG a little cooler through operation.

    That said, after home roasting now for some time, I only set mine up about a month ago *::)

    Cheers,

    -Alchemist- (<-not smart but can lift heavy things)
    ;)




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    Re: Second Failed Roasting Attempt

    Yes, a fan is a must. Also, I hand-held the HG, so next time I need to rig up a stand of some kind. I just happen to have a bottle capper from another pastime, so I think Ill use that.

    Cheers,

    Andrew.

  20. #20
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    Re: Second Failed Roasting Attempt

    Congrats on the roasting success ajayro, it is really satisfying once it all comes together and the smell of home roasted beans as you grind them is a wonderful assault on your nasal passages!!

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    Re: Second Failed Roasting Attempt

    Behmor Coffee Roaster
    Thanks Greenman. Tomorrow is G Day, ie the day when I will grind these beans for the first time; after letting them rest for a few days. Can hardly wait!



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