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Can grinders regrind coffee thats already ground?

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  • Can grinders regrind coffee thats already ground?


    I havent got a grinder yet, but am already thinking of the grinding process.

    Lets say Ive bought a kilo of ground coffee from the shops and I find that the grind is too coarse.

    Can I tip this grind into the hopper of a grinder and regrind it to a finer grade?

    As a second part to this question, if that particular grinder is already set to grind whole beans to a certain level of grind, will putting in ground coffee now yield a result that is too fine, or will that calibration still yield the same level of grind size? Hope this second question makes sense....


  • #2
    Re: Can grinders regrind coffee thats already gro

    Originally posted by tempestv8 link=1176764913/0#0 date=1176764913
    I havent got a grinder yet, but am already thinking of the grinding process.

    Lets say Ive bought a kilo of ground coffee from the shops and I find that the grind is too coarse.

    Can I tip this grind into the hopper of a grinder and regrind it to a finer grade?

    As a second part to this question, if that particular grinder is already set to grind whole beans to a certain level of grind, will putting in ground coffee now yield a result that is too fine, or will that calibration still yield the same level of grind size?  Hope this second question makes sense....  
    NEVER put ground coffee back into a hopper- unless you want the service department to be your best buddies....

    Comment


    • #3
      Re: Can grinders regrind coffee thats already gro

      tempestv8....

      As Chris says above NEVER...... NEVER EVER.....whole beans only!

      But you only grind what you need as you need it in any case.... ground coffee has a "life" of 3 minutes..... so after 3 minute just throw all the coffee you have ground - and not used - into the bin (even if it is the correct grind) - not back into the hopper.....

      And if you buy a kilo of ground coffee from a shop (unless you live next to it - within 3 minutes that is)..... save yourself the time and effort and just take your money and burn it!! The coffee will be stale before you get home..... and even if you could regrind - it wont be fresh again.

      Comment


      • #4
        Re: Can grinders regrind coffee thats already gro

        Gulp!   Im glad I asked the question.  I thought it was going to be a stupid question but I guess not!  

        Thanks again guys.  Im hoping that my questions will also be of help to other newbies.  
        And I think that the second question that I posed in the start of this thread is now a moot point. :



        Comment


        • #5
          Re: Can grinders regrind coffee thats already gro

          Just to elaborate one more step.

          The reason you NEVER regrind grinds, is that the grinds are, because they have already been ground, far more DENSE than beans are (ie a lot more more weight per volume/area or some such thing).

          So if you tip a heap of grinds down into a coffee (BEAN) grinder, the end effect is the motor isnt strong enough (not enough torque) to continue turning against the grinds and is immediately jammed up, in all probability burning out the windings.

          If you burn out the motor on a regular domestic or cafe sized grinder, you just throw it away and buy another one as it really isnt worth the cost of repair.

          Regardz,
          FC.

          Comment


          • #6
            Re: Can grinders regrind coffee thats already gro

            Just to close out on this thread, I managed to get my hands on the Rancilio Rockys user manual.

            Yeah, I know, its a bit geeky to pore through the user manual, but I have always done that even with the cars that Ive bought, i.e. go into car dealer, request for user manual, then sit down and read from cover to cover over free coffee that they serve.  I bet they dont see a lot of other customers doing that.

            Anyway, I digress.  On page 31 of the Rocky manual, it says in bold not to put ground coffee into the hopper.

            Well, that answers my question sufficiently.

            Comment


            • #7
              Re: Can grinders regrind coffee thats already gro

              Originally posted by tempestv8 link=1176764913/0#5 date=1177028583
              Well, that answers my question sufficiently.
              Not to put too fine a point on it but this is the advice that has been offered above already by several professionals and experienced amateurs alike :-?

              Mal.

              Comment


              • #8
                Re: Can grinders regrind coffee thats already gro

                Thanks FC for stating the reasons. Ive heard the same advice but have never known exactly why, and understanding the reasons makes the advice a lot more common sense.

                Originally posted by JavaB link=1176764913/0#2 date=1176773960
                And if you buy a kilo of ground coffee from a shop (unless you live next to it - within 3 minutes that is)..... save yourself the time and effort and just take your money and burn it!!
                Alternatively, you can send it to me

                Comment


                • #9
                  Re: Can grinders regrind coffee thats already gro

                  Youre welcome Greg.

                  Regardz,
                  FC.

                  Comment


                  • #10
                    Re: Can grinders regrind coffee thats already gro

                    Originally posted by tempestv8 link=1176764913/0#0 date=1176764913
                    Lets say Ive bought a kilo of ground coffee from the shops and I find that the grind is too coarse.
                    Why would one buy ground coffee if they have a grinder at home?!

                    Comment


                    • #11
                      Re: Can grinders regrind coffee thats already gro

                      At the time of asking this question, I had lots of supermarket coffee at home (still do!) which is too coarse for an espresso machine.

                      And I had not yet purchased a grinder. So it was a pre-emptive question.

                      But even if I did have a grinder, sometimes (ground) coffee comes my way in the form of presents, gifts, etc.

                      Comment


                      • #12
                        Re: Can grinders regrind coffee thats already gro

                        It takes a while to train family and friends out of gifting you with coffee. Years in many cases even.

                        To speed up that training what seems to work best is supplying your fresh roasted coffee for the pot at all gatherings and the gifting of your fresh roasted coffee at Christmas and other occassions. After a year or two even the most dense will usually get the point.


                        Java "Give the gift of real coffee!" phile
                        Toys! I must have new toys!!!

                        Comment


                        • #13
                          Re: Can grinders regrind coffee thats already gro

                          Problem Ive had with giving coffee as a gift is you also need to educate people that it does NOT have an indefinite lifespan.

                          I gave some people some coffee around August 06. I got offerred some of the very same coffee about Feb 07.

                          I told them it doesnt really last that long. Throw it out. Ill gladly give you some more.

                          "Oh no.. this is still good".

                          Arggggg.

                          Comment


                          • #14
                            Re: Can grinders regrind coffee thats already gro

                            Fatboy - some people like to treasure the gift - or because it is so nice they save it for special occasions.

                            I only give my home roasted to people who understand that it has to be drunk straight away.

                            I find the most difficult is educating them NOT to keep it in the fridge or frezer as i supply it in a one way sealed pack. They just dont get that I may know what I am talking about.

                            It just takes time and patience.

                            Comment


                            • #15
                              Re: Can grinders regrind coffee thats already gro

                              Those are indeed problems with the gifting of coffee. Ive told people time and time again to use it with-in two weeks and even put it on the label (along with the roasting date of course) and have still had it offered to me more than a year after it had been roasted!

                              Educating people and breaking them of their habits is a hard thing to do. Keep at it though as theyll thank you in the end! Either that or theyll curse you for making them incapable of drinking anything else! ;D


                              Java "Use it fresh!" phile
                              Toys! I must have new toys!!!

                              Comment

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