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Boring out an "emergency" 5C collet

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  • Boring out an "emergency" 5C collet

    I know about the pins, etc. but wnat about the slits? Do I start with a drill or find/make a small boring tool to start?

    oops, sorry, the hole will be 10 mm.

  • #2
    You'll need a hole that is somewhat undersized to start the boring bar. Since you want to finish at 0.3937" , a 5/16" or 11/32" drill will make a pilot hole with enough left to bore to size.

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    Barry Milton
    Barry Milton

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    • #3
      Bary,
      Thanks. I've never drilled into anything with slits before. Any advice??
      Bob

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      • #4
        Bob,

        A hex or square collet block is one way to fixture for drilling & boring. It gives the collet head good support.

        If you have a collet chuck in the lathe that is the easiest & best way to drill & bore. The emergency collets are dead soft and machine easily with HSS or carbide tooling. The slots shouldn't cause a problem.
        Barry Milton

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        • #5
          Some are leadaloy,some are cold rolled and some are toolsteel in case you want to harden them.

          Me I take no chances,I ditch the pins,and insert strips of sheetmetal to bore through instead.Just makes things go easier.

          I just need one more tool,just one!

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