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Thread: Precision Hand Grinder help!

  1. #1
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    Precision Hand Grinder help!

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    I just purchased this Precision Hand Grinder this week (25gm) version.

    The manual says to rotate clockwise to the end and that's the start point. When I first bought it, it was ending at 0 but this morning I notice it'd turn one more click to 11.

    Also, I've been having trouble turning the dial - the whole handle and numbers disc would rotate without the dial actually moving.

    As I was turning it now, the burr with the dial & numbers disc popped off. See photo.

    I'm having trouble putting it back together. There is a spring under the burr that keeps bouncing it up so the top dial is having trouble threading the screw. And I'm not sure once I manage to screw it back on, it'd be properly calibrated.

    Is someone able to provide some advice here? Hoping I haven't broken it?
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  2. #2
    Senior Member level3ninja's Avatar
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    I would contact your retailer as first port of call
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  3. #3
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    [QUOTE=melon;657539].....I've been having trouble turning the dial - the whole handle and numbers disc would rotate without the dial actually moving."

    The numbered dial doesn't need to rotate - you hold this steady with the handle. The burr engagement is increased/reduced by turning the pointer.

    As to reassembling the grinder, I'm not an expert on this, but if you cannot access the retailer easily, the following might be helpful as a starting point.

    The bottom threaded end of the central shaft is flattened on 2 sides. The inner burr has just a central hole without corresponding flattened sections. The turning torque is therefore transmitted to the inner burr by a dimple under the numbered adjustment dial which goes into the corresponding hole on the bottom of the inner burr.

    Therefore user calibration seems to be limited to selecting either of the 180 degree options when aligning the numbered adjustment dial to the central shaft.

    To reassemble, place the grinder with handle attached top down on the edge of a bench so that the handle and knob do not tilt the grinder body. Place the spring, then inner burr and adjustment dial onto the central shaft. Align the dimple under the adjustment dial with the hole in the inner burr. The inner burr/adjustment dial will need to be pushed down against the spring enough to allow the pointer to be threaded onto the central shaft. A fine screwdriver or other pointed implement pushed down on the outer edge of the inner burr/adjustment dial (pushing on one of the numbers will provide enough space to allow the pointer to thread on) will expose enough thread (even if the burr/adjustment dial is tilted because it is being pushed down from only one side) to allow the pointer to be partially threaded on. Another set of hands would be helpful here.

    Fully screw the pointer down until it stops. If close to zero this is the best you will get. If out more than this, unscrew the pointer, rotate the burr/adjustment dial 180 degrees and fully screw down. This should get you closer to zero. Finer adjustment of the zero point is probably achieved by use of adjustment shims above or below the central shaft bearings, but this would be beyond the capabilities of most users.

    Don't sweat too much about the burrs bottoming out at some point other than the indicated zero. The dial indicator is just giving you, the operator of this particular grinder, a reference point. It would only become an issue if you were trying to communicate a grind setting to another Precision Hand Grinder user. This can be achieved by referring to the number of full turns and numbers of clicks. eg 1.6 is one full turn and 6 clicks from where the burrs have bottomed out. 2.3 is 2 full turns and 3 clicks. Etc.

    The recommended setting for filter is 24 clicks or 2 full turns from zero. You shouldn't need to go much beyond this. Even three full turns out is still safe from completely unwinding the pointer and at this point you really will be getting boulders.

    Hope this helps. They're a great little grinder for the money.

  4. #4
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    Legend Otago! Thank you so much. I've managed to reassemble it. The start point is sitting at 11 (one click away from 0) so I'll leave it at that.

    The problem I was having earlier was that the pointer would turn both the adjustment dial and the handle (so it wasn't really adjusting, just spinning around).

    I'm yet to find the perfect grind for my Delter & Aeropress (producing 2 very different coffees with these). Will keep playing around.

  5. #5
    Senior Member Jackster's Avatar
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    Do they go fine enough for espresso? Being that mine is some 2.5 turns out, they actually might..
    I guess I should really go try myself and report back
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  6. #6
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    Glad you got it going again. I settled on 1.6 for the Aeropress.

    I tried a Delter and found it a good brewer but have reverted to the Aeropress for the ease of cleaning. The ability to store the Precision in the Aeropress piston is also a big advantage over the Delter for travel use.

  7. #7
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    Hi Jackster

    Yes, it'll do espresso but it can be a bit tedious.

    That's another advantage of the Precision - it's hexagonal shaft means a cordless drill can be easily attached for such duties.

    No problem as you get coarser though. I find it a fast little grinder for its size.

  8. #8
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    The instructions say 6-12 clicks for espresso and recommend not grinding at 0-6 to protect the sharpness of the burrs.

    I did 1.5 today for the Delter which seems to be working well with a quicker brew time than the Aeropress. Still playing with the differences between these two!

    Mine is new and won't need a burr replacement yet obviously, but was wondering if anyone has looked into replacement size / models? Could you upgrade with a higher end burr?

  9. #9
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    You shouldn't ever need to change these burrs. At domestic use levels these stainless steel burrs should last for years. I would suspect that these are a proprietary burr and that alternative burrs may not be available. Upgraditis should be the most likely pathway away from this entry level grinder into something like a Lido, Comandante or Kinu. Start saving your pennies, but in the meantime you should get plenty of use and enjoyment from the Precision.

  10. #10
    Senior Member woodhouse's Avatar
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    Quote Originally Posted by melon View Post
    I did 1.5 today for the Delter which seems to be working well with a quicker brew time than the Aeropress. Still playing with the differences between these two!
    they’re very different brewers, and you probably won’t find a common grind setting between them. aeropress is immersion/mixed-phase, delter is percolation. you might find a finer grind, higher water ratio, and shorter contact time better for the delter.



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