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Drill Bit Makes Square Holes, Round Pegs Upset

by Paul Strauss
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It’s pretty hard to be impressed by a simple drill bit, but this particular one does something I’ve not seen before. Instead of cutting round holes, this special bit cuts perfectly square ones.

square_drill_bit

If you’ve ever tried to cut a square hole with a regular drill, you know this is next to impossible, and you usually end up resorting to getting a saw or a file out to finish the job. But this unusual milling bit from Japan’s Dijet can cut squares in metal like nobody’s business. Here, check it out in action:

Pretty amazing, no? It’s hard to tell exactly how it works, but it appears to have some specially angled carbide cutting blades on it which gradually whittle away at metal in 15 degree increments. At least that’s what it looks like in the diagram. I wonder if you’ll ever be able to walk down to the Home Depot and buy one of these, or if it’s only designed for industrial milling equipment.

[via bookofjoe]

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Comments (9):

  1. Seamus Dubh says:

    The head of the drill also shifts in relation to the position of the cutting edge of the bit. In theory you could make a hole of any geometric shape with the right bit and oscillation pattern.

  2. John Wollf says:

    Hello … I”m very interested in the square hole drill bit ! can You Please tell Me where I can purchase this Diejet product? … with a price-list as well ? I would most certainly appreciate this ! Thank-You ! John Wollf

  3. Passing Stranger says:

    This is nothing new. Bits to drill square holes using the Reuleaux triangle have been around for many years, pioneered by Harry Watt more than fifty years ago and still made by his company (Watts Brothers Tool Works).

  4. Passing Stranger says:

    Oh, in answer to Seamus Dubh’s query, they also have bits for pentagonal, hexagonal and octagonal hole drilling.

  5. TALMOM says:

    where do I purchase the square drill bit.. does it need a special drill machine?
    does home depot sell them?>

  6. Birol Tarhan says:

    Çok iyi bir uygulama. İyi bir buluş. Kesinlikle işe yarar. Yeterki her zaman kare delik açma ihtiyacı olsun.Böyle işlerde fazlasıyla işe yarar.Yapanlar her kim ise kutlamak gerekir.

  7. Robert Hunt says:

    Fantastic tool! Where do you purchase one and how much? Remarkable what the Japanese people will event.

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