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Thread: Metric Auger Bits

  1. #1
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    Metric Auger Bits

    Are metric auger bits available?

    It would seem they must have been standard in Europe and Asia.

    jtk
    "A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
    - Sir Winston Churchill (1874-1965)

  2. #2
    Jim,

    I expect there are but remember UK was very late going metric and it was the major tool maker.

    ken

    Are you joining the modern world and going metric?

  3. #3
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    Are you joining the modern world and going metric?
    No, it is just an easy way to drill a 25/64" hole is with a 10mm bit.

    jtk
    "A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
    - Sir Winston Churchill (1874-1965)

  4. #4
    Quote Originally Posted by Jim Koepke View Post
    No, it is just an easy way to drill a 25/64" hole is with a 10mm bit.

    jtk
    Jim,

    Kinda like the most common or at least the most useful mortise chisel is a 5/16" but you can't find a modern 5/16" bench chisel to clean up the mortise hole. But you sure can find a bunch of 8mm bench chisels.

    ken

  5. #5
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    Star-M and Wood Owl make metric auger bits. I have both ...

    Wood Owls at the rear ...



    The Star-M bits are augers for use in a drill press.

    The Wood Owls are the best augers on the market, with three cutting edges ...





    Both come from the same manufacturer, as far as I am aware, based in Japan.

    Google for Star-M.

    Regards from Perth

    Derek

  6. #6
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    Hmmm...may go back and re-measure those older bits, some time. Since they were made and labeled in sixteenths...as in a #4 would have been a 4/16". throw in a few decades of wear, clean-ups, and more wear..


    A #5 bit...measured 1/4" between the spurs...but did not reach all the way to 5/16" ...about a 1/32" shy of 5/16".

    Same with a few others I checked...

  7. #7
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    Quote Originally Posted by steven c newman View Post
    Hmmm...may go back and re-measure those older bits, some time. Since they were made and labeled in sixteenths...as in a #4 would have been a 4/16". throw in a few decades of wear, clean-ups, and more wear..


    A #5 bit...measured 1/4" between the spurs...but did not reach all the way to 5/16" ...about a 1/32" shy of 5/16".

    Same with a few others I checked...
    Most of my auger bits measure a few thousandths over their specified size. Some of my bits are right on. Dowelling bits were made exactly to size.

    Improperly sharpened bits may be a little smaller at the spurs when someone files the outsides of the spur. These will often bind when boring a deep hole.

    A 10mm bit suits my needs for a 25/64" equivalent. A good auger bit, used carefully can leave a cleaner hole than a twist drill bit.

    jtk
    "A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
    - Sir Winston Churchill (1874-1965)

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