Pounds/foot (and other nonsense) MEW 226

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Pounds/foot (and other nonsense) MEW 226

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  • #181935
    Neil Wyatt
    Moderator
      @neilwyatt

      It wasn't there Jason, I just took one corner of the spreadsheet as the whole thing is a mess of gear ratios and centre distances and scale factors etc.

      The most surprising thing was how close the actual performance was (subjectively) to the calculations, it was certainly in the right ball park.

      Neil

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      #181939
      Michael Gilligan
      Participant
        @michaelgilligan61133
        Posted by JA on 02/03/2015 19:28:39:

        … which the SI system overcame by introducing the Newton as the unit of force. So I now buy vegetables in kilograms!

        .

        Noting that one Newton [approximately 0.225 pounds force] is exerted by a small apple on planet Earth devil

        … But Greengrocers understand the gravity of the situation

        MichaelG.

        #181940
        Gordon W
        Participant
          @gordonw

          Should there be an apostrophe in greengrocers ? To get even more confusion try reading a chinese manual ,for say a generator or tractor. Loads of unknown (to me ) units. And what did happen to the drill?

          #181943
          Michael Gilligan
          Participant
            @michaelgilligan61133
            Posted by Gordon W on 03/03/2015 09:30:13:

            Should there be an apostrophe in greengrocers ?

            .

            laugh

            NO crying … But I accept that they might expect one.

            MichaelG.

            #181952
            Mark C
            Participant
              @markc

              Neil,

              You didn't really mean to type "I saw sin theta suggested, which as theta is 90 degrees equals 1…" that did you.

              You meant Cos really?

              Mark

              #182007
              mick
              Participant
                @mick65121

                I bet nobody's taken wind speed and coastal drift into consideration!

                #182009
                JA
                Participant
                  @ja
                  Posted by mick on 03/03/2015 17:30:42:

                  I bet nobody's taken wind speed and coastal drift into consideration!

                  Let alone the conservation of angular momentum.

                  JA

                  #182013
                  Neil Wyatt
                  Moderator
                    @neilwyatt

                    > You meant Cos really?

                    No, it refers to the angle between the force and the lever. If the force was pulling or pushing the lever it would be an angle of 0 or 180 degrees and therefore no torque and 0 in magnitude.

                    I imagine you are thinking of the angle the force makes with a tangent of the circle, so we are at cross purposes, or at least 90 degrees out of phase with each other.

                    Neil

                    #182021
                    Mark C
                    Participant
                      @markc

                      Nope, I reckon if you are applying torque by definition it is a tangential force (it always acts perpendicular to the lever arm) but you might not pull at exactly a right angle so some of the effort gets lost. You then need to think of the force acting on a point on the lever arm and then you need some idea of direction but the direction is relative to the lever arm and hence rotated 90 degrees in a sense. But if it is not torque, then it is a force acting on a body and you then need to know the direction of the force which would be cos theta.

                      I suppose it depends where on the curve you start!

                      Mark

                      PS, being in the northern hemisphere, do we need to increase or reduce the torque load on threaded components depending on whether the torque wrench is turning clockwise or anticlockwise? And does that mean Australian machines fall apart easier 'cos the bolts aren't tight enough?

                      Edited By Mark C on 03/03/2015 19:41:20

                      #182054
                      John Olsen
                      Participant
                        @johnolsen79199

                        That has more to do with them being Australian….

                        #182060
                        Hopper
                        Participant
                          @hopper
                          Posted by John Olsen on 04/03/2015 00:01:54:

                          That has more to do with them being Australian….

                          And you reckon you have trouble with sparkplugs in your IC engines oiling up, up there. Should try it down here where the plug is at the bottom of the cylinder.

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