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Thread: Open or Closed Corretto?

  1. #1
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    Open or Closed Corretto?

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

    I bought a cheap Ozito heatgun and Breville breadmaker to setup a Corretto.
    Should I have a closed setup (drill hole in lid for the heatgun mount)?
    Or open setup (leave lid open during roasting and use seperate mount for heatgun)?
    I read a fair bit about this subject and would like your opinions / answers on the following -
    -Some articles suggest the closed setup produces a better flavor? Is this true?
    -Wouldn't a closed setup melt the breadmaker plastic on the breadmaker?
    -What about chaff on a closed setup?What is a method to ensure it gets removed during roasting so it isn't sitting in the pan burning and ruining the flavor of the roasting beans?
    -I see some people using an external fan and others that don't, is it recommended? What purpose does it serve? Cool the heat gun or blow off chaff?

    I would also like to know the other advantages / disadvantages of each setup.

    I've got access to a commercial air roaster (local cafe lets me use their one as long as I clean my own mess) but would still like to setup a Coretto so I can roast in the comfort of my own home. I have a popper but it doesn't roast in big enough batches for our consumption.

    Thanks everyone.

  2. #2
    Sleep is overrated Thundergod's Avatar
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    I don't know about the flavour because my correttos have been closed.
    I roast in my backyard so the chaff lands on the lawn or garden.
    I've found I can quickly lower the temperature by increasing the speed of the fan that blows away the chaff.
    I don't imagine you can do that with a closed system.
    You should be able to build one where you can try both open and closed systems and weigh up the pros and cons for yourself.

  3. #3
    Senior Member coffeechris's Avatar
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    Hi Beanhunt,

    Its all a personal thing, however what ever you do make it consistant. I prefer having a lid on mine i dont know why but its what i have done since i started roasting in this sort of setup. Many ways to achieve this, i took the entire lid of my bread maker and like i have found with most of these bread makers they have a aliminum lid under all the plastic. I unscrewed mine and use it as my lip. I was lucky as there is a hole to put the Heat gun in, allow chaff to escape and see what is going on.

    Good luck

    regdras,

    Chris

  4. #4
    Senior Member saoye's Avatar
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    I think a closed system would be much more stable in terms of heat control if you have a variable heatgun. It reduces the external variables such as wind and ambient temperature. Personally I use two pieces of glass to partially close off the top as well as the variable temp heat gun to control my temperature. I do find that it is a bit of a juggling act to smooth out the temp profile at times depending on the external factors such as wind and ambient temp, even humidity. Just remember your closed system would have to cater for easy removal for dumping beans.

  5. #5
    enjoy black coffee JamesM's Avatar
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    closed, or semi closed. I started with 'open', poor consistency. A closed pan provides more of a 'roast' or full bake style system, like any real roaster. I use a bathroom tile and slide it on and off as needed.

  6. #6
    Senior Member saoye's Avatar
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    Quote Originally Posted by JamesM View Post
    I use a bathroom tile and slide it on and off as needed.
    Same concept for me with the two pieces of oven glass. I guess tiles are more easily available for most. works well I find.

  7. #7
    Senior Member Stan's Avatar
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    I use a partial lid/covers half of the bin. I found it gave more stable temperatures. Although in Summer it is no so critical. But in winter I noticed that I could get temperature drops of up to 5 degrees and they were not predictable. I even bought a new heat gun thinking the old one was dying. So I would vote for at least a partial cover.

  8. #8
    Senior Member coffeechris's Avatar
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    Hey James and saoye, if you don't mind me asking do you guys leave the glass or tile over the top at all times until the end or do you sometimes move it to help control the heat and get a better look at your roasts?

  9. #9
    Senior Member greenman's Avatar
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    Once I enclosed my corretto I was able to have the heatgun in a fixed position and run it on a much lower temperature than the open system. I cut a hole in a baking tray for the heatgun nozzle and a flared flap at the end of the pan for the chaff to exit and allow a bent spoon in as a sampler to inspect the beans.
    Using the heat control and fan on the variable temp/fan Makita heatgun I was able to fully control and follow profiles for repeatable roasts.
    To make it work a Bosch/Makita or similar variable temp gun is essential.
    Happy roasting............................

  10. #10
    Senior Member saoye's Avatar
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    I move it about to get the reading I need. I remove one or all during 1st crack and do other things to reach 2nd crack.

  11. #11
    Life-long Learner DesigningByCoffee's Avatar
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    Hi BH
    I use a fully closed system - I don't even look at the beans anymore till they hit the cooler - go fully by the temp on my DMM.
    I found that the lid really helped for getting a consistent results. We live in a cold area, and one blast of wind could rip all the heat out of the pan, really throwing the profile out. Insulating the pan with fire blanket also made a huge difference. Here's a link if you're interested…
    Coretto Roast - YouTube

    In terms of my taste results between the two, I certainly got a much smoother & sweeter result - I think the contained heat in the pan helps to roast 'deeper' into the bean - like searing a nice steak then putting it in the oven for a couple of minutes - rather than searing it longer to cook to the middle.
    But like everyone else has mentioned - it is a bit of a journey! Keep roasting, keep tasting & see!

    Cheers Matt

  12. #12
    Senior Member GregJW's Avatar
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    G'day bh,

    I'm a covered corretto fan myself. It doesnt have to be too fancy, I just use some alfoil over about 3/4 of the top, or you can use a tile. Retains more heat in the pan and you don't have to have the heatgun up as high.

    I used to use a cheap 2-speed heatgun, getting a variable Makita was a big step up. DMM is also essential, I mostly go by that rather than looking at the beans. And you'll need a fan to blow the chaff away. Also some way of cooling the beans quickly - I use a vacuum cleaner and a bucket with a snug fitting sieve in the top.

    If you search back through old CS threads, you'll find dicsussions on this over the years.

    Good luck and enjoy the ride.

    Greg

  13. #13
    Senior Member NakiChap's Avatar
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    I removed the inner heat sheild from the original plastic lid , then used a hole saw to cut an opening for the heat gun
    Attached Images Attached Images

  14. #14
    Member sando's Avatar
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    Hi bh
    Started out with no cover.
    After +- 80 roasts and 2 years am now a fully covered and fully insulated cottetto.

    Should have done it earlier. Is all I can say, but then that's how one learns.

    A good quality HG and the DMM sure help.........all help to get consistent results.

    Happy roasting

  15. #15
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    Behmor Coffee Roaster
    Hi , i use cut down aluminum ( washed ) meat tray....just form enough of it to cover the pan and go over the edges by 10mm or so, then in diagonal corners l cut a hole ( traced first ) with a stanley knife for my variable Makita heatgun , and opposite, a "u" , which l lift back to form a guide for the expelled air/chaff that blows out......works well , its pretty durable , cheap ( free with woolies topside roasts ), quick to form and releases from the pan easily by bending back slightly the parts that fold over the sides, and lets you have full use of the pans handle ( which it's folded over as well as the side)
    l also use a pedistal fan to assist in blowing the chaff away , and have the DIY bucket cooler as per the forum here.....and of course the DMM ( a must !! )

    Forgot to mention, my heatgun is cable tied to a wooden arm that pivots and rotates , its very basic but works well http://i107.photobucket.com/albums/m...2/P1010012.jpg
    http://i107.photobucket.com/albums/m...2/P1010015.jpg

    Pic of probe position http://i107.photobucket.com/albums/m...2/P1010013.jpg

    Cheers Ken



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