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  • coffee_snob
    replied
    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

    Leave a comment:


  • omy005
    replied
    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.

    Leave a comment:


  • coffee_snob
    replied
    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

    Leave a comment:


  • omy005
    replied
    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.

    Leave a comment:


  • Ray_C
    replied
    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-)

    Leave a comment:


  • omy005
    replied
    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.

    Leave a comment:


  • coffee_snob
    replied
    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

    Leave a comment:


  • ento
    replied
    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.

    Leave a comment:


  • JavaB
    replied
    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  

    Leave a comment:


  • omy005
    replied
    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.

    Leave a comment:


  • beanflying
    replied
    Re: Spring loaded tamper

    Before I got a "proper tamper" my Solis had a plastic one built in to the left of the PF underneath the machine. The biggest and only real problem I found with it was a tilted tamp. Even with it being lighter than a lucy resting a spare hand on the top of the machine it was possible to get plenty of pressure on the PF.

    If you find it works and are happy then you are in front 8-)

    Leave a comment:


  • Thundergod
    replied
    Re: Spring loaded tamper

    Wouldnt 15kg of upward force be enough to lift up one side?

    Leave a comment:


  • omy005
    replied
    Re: Spring loaded tamper

    Originally posted by 253939263D5C0 link=1235974123/11#11 date=1236128878
    Does the machine move (or lift up) when you up-tamp?
    No, The Lucy weighs about 25kg. Think of a Silvia and Rocky in one big box. 8-)

    Andrew.

    Leave a comment:


  • yeeza
    replied
    Re: Spring loaded tamper

    Does the machine move (or lift up) when you up-tamp?

    Leave a comment:


  • omy005
    replied
    Re: Spring loaded tamper

    Originally posted by 57737A7A79794357736F71731C0 link=1235974123/5#5 date=1236083713
    Do you use your hand to cup under the PF and push
    or use wrist strength while holding the PF handle
    KK
    I just use my wrist, its not as awkward as it seems.



    Originally posted by 7873697B242D1C0 link=1235974123/6#6 date=1236096789
    7kg isnt enough for a good tamp according to current figures. should be 15kg/30lb, so you might need a sturdier spring. Might also pay to ensure it stays level by adding a couple of guiding rods or something on top? tis a good idea though *looks at pullman tamper and wonders where to fit a spring...  :-?
    The 7kg ones did seem a bit weak. I have some 12kg ones to try tonight.

    Andrew.

    Leave a comment:

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