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Home Made Hot Air Roaster 0.5 - 3kg

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  • #16
    Any plans/thoughts for a chaf collector ?

    Also ..are you sure you mean 0.3mm jet size ?..
    That is very small for a burner jet, even my little camp stove is bigger than that !
    I have some slightly smaller drill bits ( 0.010" = 0.25mm), and to use them you need a special high speed precision drill press.

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    • #17
      Originally posted by blend52 View Post
      Any plans/thoughts for a chaf collector ?

      Also ..are you sure you mean 0.3mm jet size ?..
      That is very small for a burner jet, even my little camp stove is bigger than that !
      I have some slightly smaller drill bits ( 0.010" = 0.25mm), and to use them you need a special high speed precision drill press.
      well i was thinking of getting a few different size drill bits and testing out which size works best. I was planning on putting the jet in the lathe on full speed (2000rpm) and using the tailstock chuck to drill the hole.

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      • #18
        This what you need and it won't beak the bank, probably cost more for postage.


        Gary

        Click image for larger version

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        • #19
          Originally posted by Mischa View Post
          Thanks for the info!

          The two sections just sit on top of each other, so i can take this roast chamber off and plonk one on thats a different size. I roasted 1kg in this roast chamber yesterday, however it is on the large size for that amount of coffee. I'm thinking that 80 or 100mm square would be better for 1kg, I'm planning to make one of that size tomorrow probably.
          Can you vary the flow at all?

          My design is quite different. It uses a completely conical bed, with a pyrex tube section above to prevent strays and provide visibility. It's 110mm in diameter and is a bit greater in depth. 25mm at the inlet end.
          In that configuration my first prototype would not spout with more than 40g or so, due to the slightly anaemic air source.

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          • #20
            Originally posted by MrJack View Post
            Can you vary the flow at all?

            My design is quite different. It uses a completely conical bed, with a pyrex tube section above to prevent strays and provide visibility. It's 110mm in diameter and is a bit greater in depth. 25mm at the inlet end.
            In that configuration my first prototype would not spout with more than 40g or so, due to the slightly anaemic air source.
            Yeah I've got a triac style motor speed controller, but the motor I've got is insanely powerful. I reckon I could loft 20kg+ with it. Do you have a diagram to illustrate your design?

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            • #21
              Originally posted by Mischa View Post
              well i was thinking of getting a few different size drill bits and testing out which size works best. I was planning on putting the jet in the lathe on full speed (2000rpm) and using the tailstock chuck to drill the hole.
              Mischa,.. have a read of this page. It will give you a few tips on using that small drill bit..
              Drilling very small (0.010") holes in brass?

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              • #22
                A few lessons learned, going to make a new roaster from scratch i think. Similar design, just a few ease of use modifications.

                Does anyone know the easiest/cheapest way of buying small pieces of heat resistant glass?

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                • #23
                  Yep. You can buy lantern glass (cylinders) for <$15 from a camping store. Otherwise look on ebay for borosilicate glass.

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