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18789Re: Plug Removal

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  • roylpopecharternet
    Dec 10, 2007
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      Thanks to all for several good ideas.
      I'll try a spring first, air pressure, drilling extra holes, and look
      into a broach type cutter last.
      Your feedback is appreciated.

      --- In mill_drill@yahoogroups.com, "leasingham_connelly"
      <martin.connelly@...> wrote:
      > --- In mill_drill@yahoogroups.com, "roylpopecharternet" <rlpope@>
      > wrote:
      > >
      > > Anyone have a good method for removing the plug from a bi-metal
      > hole
      > > saw after cutting a hole in steel???
      > >
      > > I'm not too happy trying to jab them out with a small screwdriver.
      > >
      > > Thanks,
      > > Roy
      > >
      > The problem with hole saws is that they can warm up when used. This
      > makes them expand and the plug then gets trapped as the saw cools
      > when the cut is finished. You could try backing out before you get
      > all the way thru, let the saw cool then clean up the groove with the
      > cool blade before finishing the hole. As Miker suggested you can fit
      > a spring, Starrett sell them for this purpose but any suitable
      > strength and size should do. Rexarino's idea of two opposing holes
      > is also workable, if drilling into material that is more than 16
      > gauge then a hole at the periphery is recommended for chips to
      > escape thru so that it does not build up in the groove and cause
      > heat build up due to excessive rubbing. A good quality arbor is also
      > essential. One that has a nut that clamps the back plate down onto
      > the saw is much better than the spring loaded type that leave the
      > blade loose to rattle about the drive pins.
      > If you have a regular requirement to use a hole saw of a particular
      > size consider getting a broach type cutter. They give a much cleaner
      > hole and last a long time if used correctly. They can be mounted in
      > a 3/4" or 19mm collet and are far better than holesaws on stainless
      > steel.
      > Martin
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