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Thread: Grimac Grinder

  1. #1
    tim
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    Grimac Grinder

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi,
    Im a bit of a newcomer to home roasting/grinding, etc. (Andy of Climax grinder fame has been indoctrinating me).
    I decided to take the advice of many in this forum and make my first real serious acquisition a grinder, sooo......
    Whats 15KG with a .25 HP motor and stands about 80 CM high?
    This little baby I found in the Trading post for $400.
    I needed to turn the fineness down after the 1st grind, because it was previously in service with a big commercial espresso machine with lots of pressure but my poor little 15bar pump needed something a tad coarser.





  2. #2
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    Re: Grimac Grinder

    Good get Tim. Depending on what use it has had it may need new burrs but that is likely to be all. A quick test is to touch the ground coffee right out of the grinder. If is is only slightly warm everything is probably OK. If more than that it might be something to consider soon.

    Cheers,

    Graeme

  3. #3
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    Re: Grimac Grinder

    Thats a really good buy. Congratulations. Perhaps you might want to consider finding out if you can get into the insides of the burrs and giving it a good clean, while at the same time checking the condition of the burrs.

    As to the grind factor, I think you should adjust your grind such that you get 25-30 seconds for your 30 ml shot. The experts here please correct me if I am wrong, but I dont think any machine pumps out 15 bars at the group head, even the commercial machines.

    Eitherway, this is a great purchase!

  4. #4
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    Re: Grimac Grinder

    Absolutely correct about the pressure Thomas. If you have selected the correct grind such that you are achieving 30/60 ml in 25 seconds, you will probably have 9 bar pressure at the group head. If indeed you did have 15 bar at the grouphead the grind would almost certainly be too fine. Getting the grind correct has the effect of decreasing pressure (given that max pressure is delivered under no-flow conditions). There are electrical and hydraulic metaphors but it is not necessary to go there to understand this.

    Cheers,

    Graeme

  5. #5
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    Re: Grimac Grinder

    Our Boema sits a tad over 10.5 Bar ............... 1050 psi Thats a lot of pressure I agree wth you Tom,

    Hey!!!! Tim Nice machine, in good condition too, what are the Burrs like?

    FB

  6. #6
    tim
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    Re: Grimac Grinder

    Hmmm,

    I would say judging by the quoted pressure levels here and my brand of machine (Sunbeam Cafe Aroma) that Sunbeam have overstated the pump pressure on the box just a tad :-)
    Anyway, I cleaned the burrs and they look to be in good condition, the coffee doesnt come out of the chute hot so thats a good sign no?
    The grinder is 2 years old and was in a cafe with 2 machines and a 2nd grinder, so I dont think its done real hard time (the doser counter said 7600 shots).
    I must say that even though my machine is a bit mediocre, the quality has improved 100 % with this grinder (over the Breville Burr that I tried to tighten and blew up!!).
    Now I have to save my coins for somehing nice like a Silvia.

    Tim

  7. #7
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    Re: Grimac Grinder

    Tim, the pump may be capable of 15 bar, but we dont generally want to pull our espressso shot at 15 bars. See gwdcoffees comment above about the fineness of the grind.

    9-10 bar at the group head is generally the pressure at which the shot is pulled.

    Specs are just numbers, stay with the general guide as a starting point, and adjust the grind to your preference, and you should be getting great coffee (reading your post you seem to be already getting good coffee)


  8. #8
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    Re: Grimac Grinder

    Whooo! Wicked grinder Tim :o Good buy for that price too.

    My only concern would be given the fact its a commercial-sized grinder. What size is the doser?

    Try not to grind too much into it lest youll find yourself wasting coffee having it sitting in the doser going stale.

    Warren -

  9. #9
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    Re: Grimac Grinder

    Great grinder :D
    One thing about the extraction with your Sunbeam is that it has pressurised PF baskets which has the effect of raising the group head pressure by adding backpressure on top of that generated by the coffee grinds (theyre made so people can get crema from supermarket bricks). This why you had to coarsen up the grind so much compared with what the cafe was using (assuming they had it fairly close to optimal). One of the guys on coffeegeek found that the Krups unpressurised baskets fit the Sunbeam so that may be an interim step while you consider your new machine options.

    Greg



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