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Thread: Grimac Grinder - an I.D.?

  1. #1
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    Grimac Grinder - an I.D.?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi all,

    I picked up this grinder yesterday. It's been dormant for a while, and wasn't exactly cleaned out after it's last use about 8 months ago. Accordingly, I can't get anything remotely like a fine grind from it. I'm wondering:

    a) Does anyone know what this is, or where I could get replacement burrs if needed.
    b) If there is are any general directions for pulling one of these things apart and cleaning it (if that's likely to improve it's performance?). Happy to start pulling apart the top end of the thing, but wouldn't mind some tips if anyone has them.

    Thanks.
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  2. #2
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    Made by Gino Rossi, apparently badge engineered to Grimac. Anyone that sells or services GR can help.

    Your problem will be in the grind adjustment area so pulling anything else apart will be superfluous including touching the grinding plates (burrs).

    The thread that the adjuster moves with will be clogged up with old grinds.

    Remove beans and hopper.

    Vacuum out the remainder of the beans from the inlet throat.

    Push lock pin down, and unscrew the top carrier / adjuster (black plastic ring). This is a regular thread, so anticlockwise will unscrew it. Unscrew until it comes right off.

    Remove (scrape etc) any pasty bogged up encrustations but DO NOT scratch anything up or use sharp metal implements for this job...anything but.

    Vacuum the area, top and bottom grinding plates, and around the bottom plate. Fit a hairy brush to vacum and go around the threads. If the encrusted grinds in the threads dont move, use another suitable method to clear the threads.They are easily damaged, dont force anything.

    Refit the top carrier. It should now go down until the plates touch. Back off about half a turn.

    Clean out the doser / dispenser. A brush and vacuum cleaner etc.

    Grind coffee, and set proper adjustment.

    THEN, you will be able to work out of the plates need to be replaced or not.

    Hope that helps.

    Attilio
    very first CS site sponsor

    PS if the grinder came from a cafe or business environment, the condition is par for the course and nothing to be concerned about. Just clean it and it will give years of good service.

  3. #3
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    Hey, thanks for that. Good to know what it actually is, and where to start with the cleaning of things.

    I'll follow your process and get as much crap off the thing as I can. When I plugged it is, it was honestly hardly grinding fine enough for a plunger, even on the most clockwise setting - so I've really got doubts as to whether the improvement I get from cleaning it will be enough. Should the burrs be at all sharp to touch? Because to me they seem pretty blunt. Probably more so than the little Sunbeam EM0480 that I've modded and been using. And I might add, which has been doing an adequate job for the San Marino single group in my kitchen... but this thing looks pretty imposing!

    Are Gino Rossi a decent grinder? Anybody want to speculate as to what a fair price for one of these is (if working)? No need to worry about offending me, in the event that paid overs...!

  4. #4
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    Repeating.....the adjusting thread will be bogged up and inability to get anything but a coarse grind has nothing to do with condition of grinding plates per se, if it is an adjustment problem. When plates are stuff-ed, they usually grind so many fines that the overall setting is too fine....not too coarse. The feel of the teeth on the plates is irrelevant, its the result that will tell you what's going on.

    You havent said but judging that you say it wont do anything but too coarse, I will assume my guess that it is an ex cafe grinder is on the money. Many cafe people dont know anything about grind adjustment and will leave a grinder on the same setting indefinitely so that over a period it gets progressively more coarse, and or will simply set them too coarse in the first place because they fear losing clients if their coffee making is perceived to be too slow. So they set a grinder to gush out espresso in about 8 to 12 seconds.....and then the clients dont come back anyway because the result is atrocious. That's called shooting oneself in the foot.

    The Gino Rossi is a very well built small volume cafe grinder and if well managed will be the ants pants in your home.

    Recapping a little. The plates may well be worn out, but you cant tell by looking at them and you will need to clean it all out and reset to see what it does. If after that it screams its head off and goes from too coarse to too fine in one step, then the plates will need to be replaced. Without knowing what model it is specifically, I believe it is probably a 64 mm plate, but dont jump to conclusions about condition of the plates until it has been investigated properly. ie if it aint broke, dont fix it.

    Hope that helps.

  5. #5
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    Thanks. Your tip led to some quick googling, and it would seem to me that it's the cc45 model. In fact, I would pretty much say it with certaintly. I did give a very quick going over to the thread section yesterday, but I'll have a much more thorough clean of the thread and clean the crap all out as you've suggested over the next few days.

    You're right - it won't do anything but too course. On the courser setting it's sending through beans which have been split into about quarters, and the finer setting is still plunger stuff. It was in a cafe - and I don't know if it was a decent cafe or not. You'd have to think not, since it shut down! And most likely your assumption of 12 second shots is right on. You know the sad truth? Some people can't tell the difference! I guess it's not sad for them; they get a coffee they enjoy. The sad part is that people like me and you who want a proper shot don't get it, because the bulk of their clients can't tell the difference...!

    Incidentally, other quick googling suggests that the plates are only $50-$100 anyway, so if I do need to replace them it's not the end of the world...

    Also picked up a 2 group (1 steam) La Pavoni machine as part of the same deal. But I'll post about that elsewhere!

  6. #6
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    When you clean up the threads, the top plate should screw right down to a point where it contacts the lower plate and they lock up together. If you cant screw it down that far ie it stops before contacting the bottom plate, then you have to keep cleaning...and maybe put just a smidgin (JUST a smidgin) of food grade sliconised grease on one of the threads to help screw it down....

  7. #7
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    The other thing that can stop you from being able to adjust the grind fine enough is when the lock pin won't push down far enough, and you end up being unable to screw the adjuster down far enough because the collar jams on the lock pin. This happens when grinds get under the lock pin and clog up the spring, so while you have the top carrier unscrewed, lift out the lock pin, fish out the spring from underneath it and make sure the hole is clean - you may have to poke a pick, small screwdriver tip or whatever you have handy down the hole to dislodge the grinds if they are packed in, and then blow the hole clear.

  8. #8
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    Good thinking GT. I never have that problem because when I clean out the top end of a grinder with my vacuum cleaner I remove the locking pin and spring first (lest they get sucked up into the vacuum cleaner) and suck out their locating hole on my way around the grinder...

    Shoulda mentioned that above....when cleaning out grinder with vacuum cleaner take care not to suck the pin and spring away......or you will be going through the contents of your vacuum cleaner bag.....!

  9. #9
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    That is a very good tip. I would have had no idea! From the way it's felt when I've been screwing the top plate down and it's run into resistance, I wonder whether this isn't part of the problem. Tonight's the night, as Rod Stewart sung. I'll have a crack.



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