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Darjeeling Hole sizes (to Tap or not to Tap)

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Darjeeling Hole sizes (to Tap or not to Tap)

Home › Forums › Locomotives › Darjeeling Hole sizes (to Tap or not to Tap)

Viewing 8 posts - 1 through 8 (of 8 total)
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  • 28 September 2011 at 22:09 #1038
    Steambuff
    Participant
      @steambuff
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      28 September 2011 at 22:09 #75528
      Steambuff
      Participant
        @steambuff
        Silly question, I have just received my water cut frames from Blackgates for the Darjeeling ‘B’ Class.
        I have marked the frames out and are about to start drilling.
         
        I just want to make sure that I am drilling the correct size.
         
        Those marked say Dia 1/4 etc are obvious …
         
        But there are some that are marked say 8BA (Does this mean I have to Tap it 8BA?) – The part that fixes to it says 8BA Clearance. (ie. Oil boxes)
         
        So do I assume that everywhere it says 8BA, I drill and tap the hole for a 8BA bolt?
         
        Dave
         
         
        28 September 2011 at 23:28 #75530
        Terry Lane
        Participant
          @terrylane

          Yes, that’s how I would read it.

          29 September 2011 at 00:30 #75532
          ady
          Participant
            @ady
            8ba is pretty small.
             
            8 BA 0.086 inch 59.1 tpi 0.0169 inch 0.0657 inch Number drill 50
            1.8 mm
            0.0709 inch

            29 September 2011 at 01:13 #75535
            Steambuff
            Participant
              @steambuff
              Yes 8BA is pretty small, some of the parts use 10BA !!!!
               
              29 September 2011 at 02:57 #75536
              Terry Lane
              Participant
                @terrylane
                It’s all relative – sometimes even 10 BA can be huge!

                 

                29 September 2011 at 17:56 #75553
                peter ravenscroft
                Participant
                  @peterravenscroft57700
                  hi steambuff
                  when you make the brakets for the tank check the size on both drawings (frames and tank)
                  wait untill you have to start tapping 12ba threads they are even smaller(con rods coupling rods etc.)
                  regards
                  peter
                  29 September 2011 at 18:06 #75555
                  Steambuff
                  Participant
                    @steambuff
                    Peter,
                     
                    Thanks for that, I will check both parts on all components (Frame, Bracket and Tank) and both in ME and on Ray’s drawings.
                     
                    I usually double or tripple check measurements … and still get it wrong.
                     
                    Dave
                     
                     
                     
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