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Gas Fired Roaster

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  • Gas Fired Roaster

    Hi Coffee Gurus,

    Does anybody know where I can get a good thermostatically controller gas valve? Either a manual thermostatic controller one or a programmable one?

    Background:
    My home built bean roaster is an upside down stainless steel bucket that sits on top of a one-burner gas stovetop I got from a camping store on eBay. Two stainless steel back-to-back colanders house the beans that are to be roasted. A rotisserie motor is bolted to the side of the bucket and a drive rod turns the colander housing. A very basic thermometer is mounted on top of the bucket and I add 200 grams of beans (a coffee cup full), and turn the gas on to medium and after five minutes I am up to 210 Celsius - then I turn the gas down to 200 Celsius and 65% to 75% into the second crack it starts to smoke enough and this is my signal to harvest.

    At this point (and using a sense of smell tuned through previous failure and successes) turn the gas off - turn the rotisserie off - turn the bucket upright - extract the drive - open the colanders - spill the beans onto my wooden table - cool the beans in a couple of minutes and put these freshly roasted beans into storage (no problems whatsoever with off-gassing issues).

    A much more important problem Id love to solve is the ability to fine tune the gas valve to deliver the exact temperatures I need for repeatability. Ive toyed with the idea of pulling apart an old gas stove to see what I could conjure but if any Coffee Snobs know of something out there that is a more "plug & play" device, I would love to hear from you.

    Mick


  • #2
    Re: Gas Fired Roaster

    Sounds like an interesting set up Mick - would love to see some pics

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    • #3
      Re: Gas Fired Roaster

      how far away is the open flame to the bottom of the collanders Mick?
      Im working on a similar idea with a cylinder made from that security mesh you sometimes see on the cover plates of intercoolers on doofdoff cars wrapped like a cylinder with a bbq lpg flame outlet connected to lpg tank,
      Im still making the parts for it but cant figure the distance reqd from mesh cylinder to the flame outlet.
      Im wondering if I need to have a metal plate over it so flames are dispersed up around the "breadbox" shaped cover that goes over the top of the mesh cylinder...Mesh cylinder is rotated via windscreen wiper motor stolen from frypandenstein.
      Any suggestions guys?
      TC prob will be inserted horizontally into the cylinder would that be enough to gain temp of bean mass inside cylinder?

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