Announcement

Collapse
No announcement yet.

Heat Gun Temps... Plus???

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • greenman
    replied
    Re: Heat Gun Temps... Plus???

    Corretto roast:--
    600g
    Heat gun setting on 4-5 (goes up to 9) fan speed on three
    starting from cold i usually reach 100C by 4 mins, i adjust heat to follow my profile usually around 12-15C per minute reaching 1C at around 12min mark, ease off on the heat to a rise of 3C per minute until I reach the roast level I am aiming for or 2C between 4.5-6mins depending on bean type.
    Temperature at 1C around 198c-202c
    reach 2C around 218-220c
    temperature readings vary from roaster to roaster depending where the probe is placed, if I do a 300g roast my temps are all out because the probe is too high! need to drill another hole lower to get probe in bean mass.
    I find roasting 600g gives a lot more even roast than smaller amounts.
    Happy roasting
    gm

    Leave a comment:


  • chinook9
    replied
    Re: Heat Gun Temps... Plus???

    Originally posted by 5F747171741D0 link=1282682268/7#7 date=1282775610
    Hmmmm, I’ll start by saying I’m no expert, and have a limited pallet, but the following seems to work for me.
    At present I’m doing 450gms at a time.
    Bosch electronic heat gun and home made, with lid, bread machine.
    1.   Dump beans into machine, heat gun at 100C and fan on 3 (highest setting), wait till the bean mass gets to 50C.
    2.   When bean mass reaches 50C, start timer and increase heat gun temp in 10C increments every 10sec, 15 sec, or 20 sec (dependant on bean hardness, which I determine by the temp they reach 1st crack) I’m only guessing here, as I don’t have any evidence that this is true.
    3.   Continue increasing the heat gun temp. until 400C
    (I read something, somewhere, that a roasting temp that was too high caused the bean structure to deteriorate and the oils and aromatics dissipated more quickly, i.e.   beans went stale quicker.  )
    4.   As the bean mass approaches 1st X, in my machine around 190C, reduce the heat gun temp. to 290C-300C, dependant on ambient temp, and coast through 1st.X and onto 2nd.X or whenever the bean mass is dumped for cooling.
    Ps. I usually aim to reach 1st.X at 10-12min. and the start of 2nd X at least 4min. later, usually around 16-18min per roast.    
    Thanks for the input. Just the type of help I was looking for. Your times are congruent with most of the profiles I have seen and I expect they should work for me.

    Would you change much if you were only doing 225 gms at a time? Id like to "practice" with smaller amounts of coffee but I believe that smaller amounts are more difficult to get right.


    Leave a comment:


  • Billi
    replied
    Re: Heat Gun Temps... Plus???

    Hmmmm, I’ll start by saying I’m no expert, and have a limited pallet, but the following seems to work for me.
    At present I’m doing 450gms at a time.
    Bosch electronic heat gun and home made, with lid, bread machine.
    1. Dump beans into machine, heat gun at 100C and fan on 3 (highest setting), wait till the bean mass gets to 50C.
    2. When bean mass reaches 50C, start timer and increase heat gun temp in 10C increments every 10sec, 15 sec, or 20 sec (dependant on bean hardness, which I determine by the temp they reach 1st crack) I’m only guessing here, as I don’t have any evidence that this is true.
    3. Continue increasing the heat gun temp. until 400C
    (I read something, somewhere, that a roasting temp that was too high caused the bean structure to deteriorate and the oils and aromatics dissipated more quickly, i.e. beans went stale quicker. )
    4. As the bean mass approaches 1st X, in my machine around 190C, reduce the heat gun temp. to 290C-300C, dependant on ambient temp, and coast through 1st.X and onto 2nd.X or whenever the bean mass is dumped for cooling.
    Ps. I usually aim to reach 1st.X at 10-12min. and the start of 2nd X at least 4min. later, usually around 16-18min per roast.

    Leave a comment:


  • chinook9
    replied
    Re: Heat Gun Temps... Plus???

    Any more help with the original question??

    Leave a comment:


  • kesa32
    replied
    Re: Heat Gun Temps... Plus???

    Looks good trevor ! , would it be worth insulating the tray as well oven chanber to retain even more heat ? ( could maybe back the hg temp down even more )
    Had a look in K Mart yesterday , they are closing out some 750g "homecraft" BMs ..$29  with 12 months warranty ( which us snbs would probably void hey )

    CCs have a HG same as yours for $70....looks like new, lll have to see what the new ones are worth

    l had a look at turbo ovens as well in HNs ......so all l have to do is make a choice of method now and lll be off and running!

    Cheers ken

    Leave a comment:


  • greenman
    replied
    Re: Heat Gun Temps... Plus???

    Hi Ken, I used a $4 metal baking tray from Coles, cut a round hole for the heatgun nozlle and a vent at one end for the chaff to escape, check a pic of set-up below

    http://www.facebook.com/photo.php?pid=4871124&l=8e6995a3ce&id=520347251

    cheers
    trevor

    Leave a comment:


  • kesa32
    replied
    Re: Heat Gun Temps... Plus???

    Hi , hey Greenman what method did you use to close in your BM?

    lm still tossing up whether to go drum roasting or corretto style :-/

    Cheers ken

    Leave a comment:


  • greenman
    replied
    Re: Heat Gun Temps... Plus???

    Since I closed in my bm and purchased the Makita hg with 3 speed fan, I run it on the top fan speed and have been able to cut back the guns temp markedly--roasts have been lovely and even, taste great.
    I agree with shawty the higher air volume does make a huge difference.
    happy roasting

    Leave a comment:


  • shawty
    replied
    Re: Heat Gun Temps... Plus???

    I usually start at somewhere between 420-460ºC depending on the ambient temp.
    This gives me a roast profile that ramps up a little quicker at the start and then slowly flattens to first crack, I hardly have to play with temps to first crack at all.
    I used to start lower (340-380) and try to get a straight ramp to first crack but preferred the taste of the quicker ramp at the start and preferred the easier roasting style.
    My HG is set just below the bowl top lip and is 3/4 covered with a lid.

    I think the actual temps are only a guide though as I notice that the volume of air makes a huge difference to the profile.  
    My HG has a digital temp output in 10ºC incriments and 3 volume settings and if I use the medium setting (as compared to high) I have to use a lot more heat for the same results.

    Just find out what works for you as I think that the variables between setups are probably quite large and make comparisons a little irrelevant.

    Leave a comment:


  • chinook9
    started a topic Heat Gun Temps... Plus???

    Heat Gun Temps... Plus???


    I few weeks ago, I accidentally purchased a couple of pounds of Costa Rica Don Quixote green beans. Being a tinkerer, I researched the problem, and purchased a used bread machine, an infrared thermometer, and a heat gun.

    After viewing a few videos on YouTube, and not wanting to ruin my Don Quixotes, I purchased some colombian beans locally and tried a couple of 227 gm roasts. I ruined the first beans and the second roast wasnt going real well when my BM shut down due to heat.... first crack at about 6 minutes and the machine shut down at 10.

    I believe my biggest problem was setting the HG temp too high...426C (first roast) and 371C (second roast). I had the nozzle inside the BM about 30cm above the top of the bread pan.


    At this point I did more research and discovered coffeesnobs which has enlightened me considerably and I am now on a new path.

    I rewired the bread machine (on/off switch and all circuity bypassed), and purchased two more thermometers.

    I will set up my rig with a k-type thermocouple inserted through the side of the bread pan into the bean mass, a thermometer inserted into the air down 5-6 cm inside the bread pan , and I will have an infinitely variable control (router speed control) on the heat gun.

    I believe I now know enough to make a much better effort except for the temps of the heat gun. My HG has 8 (204 - 593C) temperature settings and a two speed fan. I am able to change the discrete settings easily and I can make minute changes with the variable control. I would like to know what HG temps coffeesnobs use with the HG/BM setups for both 230 and 460 gm roasts.

    Any information would be appreciated.
Working...
X