Lathe turning tool nomenclature

Lathe turning tool nomenclature

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  • #868778
    JA
    Participant
      @ja

      Once upon a time a “left hand knife” turning tool cut towards the lathe head stock (ref: Myford Series 7 Manual by Ian Bradley). Now Myford supply insert holder for cutting towards the head stock as “right hand”. Why the change or is it just to confuse old people like me?

      JA

      #868784
      JasonB
      Moderator
        @jasonb

        I have always termed a L/H tool as one that cuts from left to right, so insert holders are no different. mybe Mr Bradley is to blame

         

        Harrold Hall has it as I learnt at school

        hand

        #868800
        Bill Phinn
        Participant
          @billphinn90025

          This was puzzling to me as well once.

          Just remove your focus from the direction the angled tip points in and consider only the direction it cuts from relative to the operator. Then all will become clear.

          The handedness of boring tools follows the same pattern as long as we assume (which I think we safely can do) that the operator uses them whilst facing the chuck rather than looking across the bed as in the first case.

           

          #868801
          JA
          Participant
            @ja

            I have just dig out my copy of Sparey’s “The Amateur’s Lathe”, first published in 1948. He clearly says a left hand knife tools cuts towards the headstock. I am no longer going to look for my apprentice notes.

            JA

            #868812
            Bill Phinn
            Participant
              @billphinn90025

              I’m looking at a copy of Sparey now. On page 77, in figure 63, he shows a drawing of an HSS turning tool that today would be universally described as a right-hand tool. His description says: “The illustration shows a right-handed tool for cutting towards the chuck”.

              I can only assume there must be different editions of Sparey saying different things on this subject.

              #868813
              JasonB
              Moderator
                @jasonb

                You must have a different edition of Sparey than me JA

                rhOn page 77 it clearly shows and stated a R/H too cutting TOWARDS the chuck

                #868817
                Roderick Jenkins
                Participant
                  @roderickjenkins93242

                  My edition of the Bradley Myford series 7 manual says this:

                  bradley s7 manual rh tool

                  Rod

                  #868818
                  ega
                  Participant
                    @ega

                    An analogy from woodturning might help: imagine the turner working a skew chisel towards the headstock – his right hand naturally grips the blade and the reverse is true for the other direction.

                    #868828
                    DC31k
                    Participant
                      @dc31k
                      On ega Said:

                      An analogy from woodturning might help: imagine the turner working a skew chisel towards the headstock

                      That might not be a good analogy as with a woodturning tool, BOTH hands are involved in its use.

                      It is only by convention that (if what you say is correct) we hand the tool by the one that touches the steel part and not the one that touches the wooden handle.

                      One could draw an equally poor analogy with guitars: they come in both left and right handed, but the defining one is the one that does the strumming not the one that frets the notes.

                      #868849
                      JA
                      Participant
                        @ja
                        On JA Said:

                        I have just dig out my copy of Sparey’s “The Amateur’s Lathe”, first published in 1948. He clearly says a left hand knife tools cuts towards the headstock. I am no longer going to look for my apprentice notes.

                        JA

                        Sorry. I messed up my reply. I should have said right hand.

                        Humble pie.

                        JA

                         

                        #868858
                        old mart
                        Participant
                          @oldmart

                          I have always known a right handed lathe tool to be normally used to face off the right side of the workpiece, and vice versa for the left tools.

                          #868906
                          JohnF
                          Participant
                            @johnf59703

                            Right hand cuts from right to left  — left hand cuts from left to right ! simples !

                            John

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