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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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    [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.

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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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    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.

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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.

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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?

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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!
    theyíre very different brewers, and you probably wonít 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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    Does anyone have any tips for an increasingly squeaky grinder? I was thinking a bit of coconut or olive oil might work but don't want to wreck the thing.

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    Senior Member Yelta's Avatar
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    Quote Originally Posted by melon View Post
    Does anyone have any tips for an increasingly squeaky grinder? I was thinking a bit of coconut or olive oil might work but don't want to wreck the thing.
    Try a bit of food grade grease Melon, something similar to Inox available from Jaycar should do the trick.

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    Have a look at the funnel ring on the top of the grinder and make sure it hasn't come loose. It doesn't seem to do anything to contribute to a squeaking noise but does make such a noise when being screwed in, so maybe worth a look.

    Other than that I can't suggest anything other than the lube suggested by Yelta.

    I managed to drop mine last week and while trying to straighten out the ding dropped it again and put a ding in the other side. Why wouldn't it land on the top rather than the bottom?

    Pretty much now out of action unless I can find a slip-on catch can to replace the screw-on one.

    Decided to stretch the budget a little bit for a replacement and have ordered a Made by Knock Aerspeed which is a cheaper version of the Aergrind but with more aggressive burrs aimed more at pour over/filter grind. £75 plus £17 freight ends up at $175 landed. A good little grinder with nothing of similar quality/performance that I have identified at that price point.
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  14. #14
    Senior Member Jackster's Avatar
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    Mine was squeaky too. The wood look handle knob was the culprit. It's retained by a magnet, pop it off and a bit of grease before pushing it back on.
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    Thanks all! I've bought some food grade Inox online so will give it a little grease up when it arrives and see how I go.
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    Turns out it was the handle knob on mine too! If only I'd paid a bit more attention as I'm sure a bit of kitchen oil would've been fine for that part. All greased up and ready to go now - no more annoying my office with spine-tingling squeaks.

  17. #17
    Senior Member Jackster's Avatar
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    I just used CRC. It's kinda food grade, but needs a heap of OJ to make it palatable
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    Quote Originally Posted by Otago View Post
    Have a look at the funnel ring on the top of the grinder and make sure it hasn't come loose. It doesn't seem to do anything to contribute to a squeaking noise but does make such a noise when being screwed in, so maybe worth a look.

    Other than that I can't suggest anything other than the lube suggested by Yelta.

    I managed to drop mine last week and while trying to straighten out the ding dropped it again and put a ding in the other side. Why wouldn't it land on the top rather than the bottom?

    Pretty much now out of action unless I can find a slip-on catch can to replace the screw-on one.

    Decided to stretch the budget a little bit for a replacement and have ordered a Made by Knock Aerspeed which is a cheaper version of the Aergrind but with more aggressive burrs aimed more at pour over/filter grind. £75 plus £17 freight ends up at $175 landed. A good little grinder with nothing of similar quality/performance that I have identified at that price point.
    Hi Otago,
    I ordered an Aerspeed directly from Made by Knock last week, awaiting delivery. Just wondering how long did the delivery take for yours (apparently some buyers in the past had to wait up to 2 months!)? Also how's your experience with your Aerspeed overall? there seem to be some reports on shaft misalignment, dial slippage while grinding, etc on some units, suggesting QC issues? thanks Mo

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    Precision Hand Grinder help!

    Hi Mo

    Firstly, sincere apologies for the delay in reply. I somehow missed your post.

    Hopefully you have received your grinder by now. I can't recall the exact time for my delivery but think it was within the expected 9 - 11 days. I think you can experience delays if you just happen to order when a batch runs out.

    There is some runout with the inner burr but this pretty inherent in a design that still fits 38mm burrs, without a bearing below the inner burr, into a grinder that will store within an Aeropress piston. But I believe the performance is still on par with any other grinder on offer in this performance/price bracket.

    On the issue of shaft misalignment I haven't personally experienced that with my Aergrind, nor the Aerspeed. There has been some comment about the outer burr in the Aerspeed being differently secured than in the Aergrind. The Aergrind appears to be a press fit whereas the Aerspeed is retained with a grub screw on one side. There are some claims that this results in the Aerspeed outer burr being pushed out of concentricity. I am not about to remove the outer burr to see if there is any substance to these claims as my Aerspeed is operating satisfactorily. If there was enough play to allow this to happen a shim opposite the grub screw would rectify the issue, but I doubt that there is enough looseness in the tolerances to allow this to happen.

    As to adjustment dial slippage this could happen if an o ring on the central shaft is a loose fit. You should have received spare o rings in your package labelled standard or stiff. I suspect mine was fitted with a stiff o ring as I had the opposite problem with the adjustment dial being too stiff to turn. However, I was able to rectify this with some Dow 111.

    I wouldn't disassemble the grinder if you are not very confident with mechanical issues, but if you feel so inclined the following thread on the UK coffee forum contains some parts diagrams that might be helpful. https://coffeeforums.co.uk/topic/390...issing-o-ring/

    Hope you have received your grinder by now and that you are happy with it. While it does seem that some have problems, the overall impression from comments on various forums is that most owners are satisfied with their purchase.

    Cheers.
    Last edited by Otago; 15th December 2019 at 07:11 PM.

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    Very timely that people have bumped this thread up. I'm not sure what's the correct term for my issue. In the past week, the grind settings on my Precision Hand Grinder haven't remained consistent.
    For example, I will turn the dial until it stops, and it might fall on number 8 or 9. And then the next time I use the grinder, it might fall on 0 or 1.
    I will usually use where it stops as the reference point to start my clicks, but I noticed if it falls on 8/9, 24 clicks is coarser than if it falls on 0 or 1. Then at times, 15/16 (which is med-fine on this grinder) will grind coarser. I've also found when I grind coarsely that bits of beans get stuck between the burrs.
    I noticed that this could be due to the nut on the top (under the handle) being a bit loose. Should I tighten this more?

    I really love this grinder and hope it doesn't need to be replaced. Had it for around 4 months and use it 3 times a day.

    The manual, as posted by another member, is here - https://coffeesnobs.com.au/documenta...er-manual.html

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    Hi Otago,
    Many thanks for your detailed reply, very informative. Thanks!
    I received my Aerspeed a while ago and overall Iím happy with it so far. However, If I want to be critical, there are two things that Iíd appreciate to have your comments on them.

    1. If I hard lock the burrs (zero setting), where the crank cannot be rotated anymore, I expect the burrs to sit flush in line with each other, in mine the inner burr stays slightly out of the outer burr. I can feel with my finger nail a step up at the edges of the inner burr. Iím hoping the burrs sit flush once they broken in over time?
    2. I mostly brew for V60 and French Press so grind consistency at coarser grinds is more important for me. Zero setting in my Aerspeed is @ 10. If I open up the burrs by 2 notches (so the pointer on the handle is @ 12 now) I can rotate the crank and feel the burrs are rubbing against each other for about ĺ turn then rotate free for the remaining ľ turn. Apparently there is a burr wobble here. By reading several threads in different forums, Iíve now convinced that some burr wobble is normal in almost all grinders. Now If I keep opening the burrs by 8/12 turn (so the pointer is on 8 now), the burr rub is completely gone. I guess it would be lessened over time when the burrs get seasoned a bit, just donít have any reference to understand whether that much rub is excessive or is just normal? I read somewhere else that MBK considers any burr rub at below ĺ turn to be completely normal (and in fact inevitable), but not sure how reliable is this statement? Wondering whatís your thought and if youíve ever noticed any burr rub in your grinders at all? Thanks again!
    Last edited by Motalebi; 17th December 2019 at 10:34 AM.

  22. #22
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    Hi Melon

    You might have hit on the possible cause of your varying grind settings when you mention grounds being stuck between the burrs. I was going to suggest that, when making changes to grind settings, you turn the grinder upside down and rotate the burr anti-clockwise to first dislodge any grinds remaining between the burrs.

    As to the top nut, even when this is screwed down to its stop point there may still be some end play. Be aware that this is a LEFT HAND thread.

    Hope this helps. These are a great little grinder and real value for money.

    Cheers.

  23. #23
    Senior Member Jackster's Avatar
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    I found I could slightly reduce the burr rub by changing the position on the top bearing carrier.
    So I found the setting that is just started to rub, then moved the top carrier to a spot that the rub was gone, then repeated a few times getting finer each time. A dab of superglue to hold it, and that's about as good as it can get

  24. #24
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    Quote Originally Posted by Otago View Post
    Hi Melon

    You might have hit on the possible cause of your varying grind settings when you mention grounds being stuck between the burrs. I was going to suggest that, when making changes to grind settings, you turn the grinder upside down and rotate the burr anti-clockwise to first dislodge any grinds remaining between the burrs.

    As to the top nut, even when this is screwed down to its stop point there may still be some end play. Be aware that this is a LEFT HAND thread.

    Hope this helps. These are a great little grinder and real value for money.

    Cheers.
    Thanks Otago! I am finding the stuck grounds more of a common problem. I didn't have this issue until in the last week. Also, with the top nut coming loose, it looks like it causes the bottom burr to drop a bit so the grinds end up coming out coarser than what's been dialed. I'll have to think about a way to keep this held - perhaps the suggestion of super glue. Thanks!

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    After letting Alternative Brewing know about the burr issue, they'd very kindly and quickly sent me a replacement grinder.
    However, annoyingly and only a month after receiving this replacement, the knob attachment came off while I was grinding.

    There is a hole underneath which makes me think a pin holds the handle and knob in place. See attached photo.
    Could someone with this grinder please let me know how these 2 parts are attached?
    I looked everywhere around my kitchen for a pin but couldn't find one.

    I've let AB know about the issue.
    Attached Images Attached Images

  26. #26
    Senior Member LeroyC's Avatar
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    Quote Originally Posted by melon View Post
    After letting Alternative Brewing know about the burr issue, they'd very kindly and quickly sent me a replacement grinder.
    However, annoyingly and only a month after receiving this replacement, the knob attachment came off while I was grinding.

    There is a hole underneath which makes me think a pin holds the handle and knob in place. See attached photo.
    Could someone with this grinder please let me know how these 2 parts are attached?
    I looked everywhere around my kitchen for a pin but couldn't find one.

    I've let AB know about the issue.
    Yeah itís a pin. As seen here -



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