Pipe machining frustrations.

Pipe machining frustrations.

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  • #788902
    Peter Cook 6
    Participant
      @petercook6

      Why does every job in this hobby end up needing three others doing before you can start!

      I have reached the stage in my clock project where I need to machine the winding drums. They are 42mm OD and 85mm long. I have sourced some steel pipe 42mm OD with 4mm wall. Now I just need to machine it on my little Taig lathe.

      I do have a couple of live centres, the standard Taig one (1/4″ diameter), and a couple of Chinese ones based on a bearing carrier that can be held in the tailstock drill chuck – on the right below. But nothing that is going to help with the pipe.

      centres873

      So after a bit of work I now have a basic pipe centre that should do, and what feels like several miles of aluminium string.

      Then I realise that the fixed steady  for the Taig has a maximum capacity of 11/2″ (38mm) – so now before I can actually start the real job I need to decide whether to make a bigger fixed steady (will I ever use it again), or possibly an expanding plug I can put in the end of the tube to support it while I face the tubes to length. Three drums and six ends to do!

      #788909
      Bazyle
      Participant
        @bazyle

        Normal method is to turn a piece of wood to a tight fit in the tube end and put a centre in that. If you think the centre in wood may not be firm enough drill and glue in a bit of brass.
        If you want a fixed steady again wood is good enough.

        #788954
        bernard towers
        Participant
          @bernardtowers37738

          personally if you are expecting a Taig to machine steel pipe of that dia you are on a hiding to nothing.Find a friend with a 3 1/2 ”  plus lathe and beg a morning off him.

          #789916
          Peter Cook 6
          Participant
            @petercook6

            Just a quick report back – first workshop session since I asked for help.

            Thank you Bazyle for the wood suggestion, I happened to have some old curtain pole which was a perfect fit, and it worked like a charm, as did the pipe centre, although I did things in the wrong order and turned the pipe before facing using the wood as a centre.

            Turning the 90mm long 42mm diameter pipe at 260 rpm, 0.15mm depth of cut and power feeding at 0.05mm/rev worked way better than I expected. With a bigger lathe it would presumably have gone a lot quicker, but I now know what’s possible. Two more drums to go.

            turningfacing

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