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Re-Purpose Sunbeam EM0480 Burrs ?

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  • Re-Purpose Sunbeam EM0480 Burrs ?

    Hi guys,

    Years ago I got a 2nd hand Sunbeam EM0480 grinder with an old Rancillio Audrey machine. I think the grinder must have been well worn when I got it, and a year later is was practically useless, even after fitting shims. The central shaft/burr had that much radial wobble and axial play in it, the only thing stopping it eating out the side of the plastic housing was the outer burr!

    Today, I decided to see if I could pull the grinder down, and possibly replace some worn parts, and give it a new lease off life. Short answer no. The main shaft bush, which was flogged out, is moulded into the plastic gearbox, and it just isn't worth the trouble.

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    So that left me with a pair of conical burrs. Were they still serviceable - only one way to find out. I mounted the inner burr on a 20mm shaft, machined the outer burr plastic housing to remove the steps and lugs, and clamped them in the milling machine.

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    This was a pretty rigid setup, and removed any of the variables you would usually find in a cheaper plastic coffee grinder! I ran the mill at 240rpm set the axial clearance at 0.4mm and sacrificed some Aldi beans to caffeine science.

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    Not too bad - fine, fluffy, uniform, minimal clumping. Not practical for everyday use, but I think with the right conditions, these burrs may be useful for something, possibly for a home-made hand grinder? Sound like the start of a new project.

    Cheers, Steve
    Last edited by Stavros; 13 September 2019, 05:19 PM. Reason: Pop another picture in.

  • #2
    Steve, you nailed the last grinder, don't wast time on these burrs, throw these burrs in the back of the shed and then go build a classic lever coffee machine as a project, more worthy of your talents Your grinder thread was great



    Internal shot of bosco lever - simples

    http://coffeesnobs.com.au/Attachments/Bosco_3.jpg

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    • #3
      Ahhhh, come on 338, just a little scrap-box project, not a real one. Don't buy any material or bearings, just make do with what's in the parts draw and in the offcut bin. RESIST the urge to buy Mazzer Kony conical burrs! It may not be pretty, but it should make fluffy grounds. It would be handy during the zombie apocalypse, when the mains power goes out for extended periods. It would go well with the Otto Little Guy I just ordered at a bargain price. And if I get lazy I can use the battery drill to operate it, um, until it runs out of charge.

      It would be an interesting concept making a manual espresso machine. Hmmm, the boiler built around the group head and the piston assembly, so everything comes up to temp at the same rate, borosilicate glass windows in the side to watch the scale build up. Made from manganese bronze. Maybe a little sketch first. No, no, that way madness lies.

      Cheers, Steve
      Attached Files

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      • #4
        Originally posted by Stavros View Post
        It would be an interesting concept making a manual espresso machine. Hmmm, the boiler built around the group head and the piston assembly, so everything comes up to temp at the same rate, borosilicate glass windows in the side to watch the scale build up. Made from manganese bronze.
        Maybe a little sketch first.
        No, no, that way madness lies.

        Cheers, Steve

        Now there is the sort of thinking which has advanced the human race!! Fully saturated lever action group head. CAD the design, you may get a few enquiries for more!

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