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  1. 2nd January 2015, 02:58 PM #1
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    mike48
    mike48 is offline Senior Member
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    Default How Are Very Small Twist Drills Made?

    I was using some 0.3mm and 0.5mm twist drill bits today to clean up a tiny hole in a PC board.

    I wondered how these things are actually made?

    With a 10x loupe, they seemed to have ground flutes.
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  3. 2nd January 2015, 05:42 PM #2
    Michael G
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    Drill bits can be ground from solid, so that could well be correct. I've seen some that look to be machined and I believe that the ones with coolant channels can actually be twisted.

    Michael
  4. 2nd January 2015, 08:13 PM #3
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    nine fingers
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    Many years ago I had visit to the P & N works at Maryborough in Victoria ,I was amazed at
    worker sharpening minute small drills by hand. These drills were that small I could not
    see the twist on them with the naked eye. John.
  5. 2nd January 2015, 08:37 PM #4
    cba_melbourne
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    Quote Originally Posted by mike48 View Post
    I was using some 0.3mm and 0.5mm twist drill bits today to clean up a tiny hole in a PC board.

    I wondered how these things are actually made?

    With a 10x loupe, they seemed to have ground flutes.
    Anything really small and accurate, ask the the Swiss:
    http://www.rollomatic.ch/rollomatic-...-tool-grinder/
  6. 2nd January 2015, 09:15 PM #5
    welder
    welder is offline future machinist
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    Quote Originally Posted by cba_melbourne View Post
    Anything really small and accurate, ask the the Swiss:
    http://www.rollomatic.ch/rollomatic-...-tool-grinder/
    wow that impressee
    BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

    Andre
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