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  • #16
    Re: Spring loaded tamper

    Originally posted by 003C213A303126333B30540 link=1235974123/13#13 date=1236141592
    Wouldnt 15kg of upward force be enough to lift up one side?
    Yes, it will. I just tried the 12kg spring and it is just border line on lifting one side of the machine. Its also a bit much to do single handed (my wife definitely couldnt do it with one hand). I still got 60ml in 30sec from my double basket though. The puck seemed to be visibly nicely tamped before extraction with this amount of force. With the 7kg force I could still detect some very small gaps in the surface. So Im going to try about 10kg which should give me a nice tamp and not lift the machine.

    As also mentioned above Im having a little trouble with a tilted tamp, but I think with practice (or maybe a circular leveling bubble) I can get this right.


    Andrew.

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    • #17
      Re: Spring loaded tamper

      Andrew,

      Sorry to "rain on your parade" but there are all sorts of issues with tamping upwards..... thats why we (Pullman Tampers) have stopped supplying (some time ago) replacement fitted bases for the Quaha and similar models.

      Greg started the business making replacement fitted bases for these machines.... but it is almost impossible to get a consistent upwards tamp... even if you dont totally lift the machine it will skew somewhat as you tamp... or the basket will get skewed....

      PF on a hard surface (so the puck is horizontal in both directions).... with pressure down on the tamper is by far the best and most consistent method....

      To tamp upwards you really need to press down on the machine... whilst you push the PF up... hold it square in two dimensions and apply a consistent force (which at least the spring will help you with)....

      But in reality, although an interesting engineering task, it wont prove to be as successful as a more conventional tamping method....

      Sorry  

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      • #18
        Re: Spring loaded tamper

        What you need to add to this is an eccentric/gyroscopic drive to the top of the tamp mechanism, so your shot is nutated. You will then need much less tamp force.

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        • #19
          Re: Spring loaded tamper

          i like it keep up the good work, practice with it and you will get consistent tamps in no time. liking the work you have put into your machine as well, good stuff

          Comment


          • #20
            Re: Spring loaded tamper

            Originally posted by 414D444447477D514C4D40220 link=1235974123/18#18 date=1236237072
            i like it keep up the good work, practice with it and you will get consistent tamps in no time. liking the work you have put into your machine as well, good stuff

            Thanks for the kind words. The downward tamp does seem to be easier to control but Ill see how I go with some practice. If it doesnt work out I have some other ideas to try.



            Originally posted by 6843544360220 link=1235974123/16#16 date=1236167085
            Andrew,

            Sorry to "rain on your parade" but there are all sorts of issues with tamping upwards..... thats why we (Pullman Tampers) have stopped supplying (some time ago) replacement fitted bases for the Quaha and similar models.

            Greg started the business making replacement fitted bases for these machines.... but it is almost impossible to get a consistent upwards tamp... even if you dont totally lift the machine it will skew somewhat as you tamp... or the basket will get skewed....

            PF on a hard surface (so the puck is horizontal in both directions).... with pressure down on the tamper is by far the best and most consistent method....

            To tamp upwards you really need to press down on the machine... whilst you push the PF up... hold it square in two dimensions and apply a consistent force (which at least the spring will help you with)....

            But in reality, although an interesting engineering task, it wont prove to be as successful as a more conventional tamping method....

            Sorry  
            I dont mind some rain, I think were still in a drought here. It really is just and engineering exercise as I like to tinker and have the software and machine tools at work to expand my knowledge. Wait until you see my grinder chute mod.

            Andrew.

            Comment


            • #21
              Re: Spring loaded tamper

              what if you took the spring method and applied it to a conventional type tamper, of course it wont be conventional any longer will it? I made a timber type lever pull down tamper with a spring in it some time ago, it works very well, i offered to someone for their mum who was having trouble getting enough tamp pressure but they didnt take it, i think he was also going to build her one out of a ammo reloading press, so as you see there are quite a number of works of art in the way of gadgets to be found here, there should be a subject heading somewhere if you look for it... anyway coffee nirvana awaits... ciao for now... Ray. 8-)

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              • #22
                Re: Spring loaded tamper

                I have changed the design and made the mount out of Acetal plastic rather than the aluminium to give a smoother sliding action. The rest of the hardware is stainless steel. I,ll see how it goes.

                Andrew.

                Comment


                • #23
                  Re: Spring loaded tamper

                  i am wondering where you work that you can wip something like that up.
                  i thought my metal lath was good for a shed but you seem to have it all

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                  • #24
                    Re: Spring loaded tamper

                    Originally posted by 4C4049494A4A705C41404D2F0 link=1235974123/22#22 date=1236581557
                    i am wondering where you work that you can wip something like that up.
                    i thought my metal lath was good for a shed but you seem to have it all
                    I work in the R&D section as a machinist making prototype parts for a team of mechanical design engineers. Have done it for about 25 years. We have numerous CNC mills & lathes and good CAD/CAM software. So making espresso hardware is very similar to what I do every day, all day.

                    By the way I tried the improved version of the tamper tonight and it has a much smoother action with a consistent tamp force.

                    Andrew.

                    Comment


                    • #25
                      Re: Spring loaded tamper

                      i noticed what a good job you did with the engraving on the end of your pf so i thought it must have been somewhere cool

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