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  1. #1
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    Default Carbide Spade Drill Bits

    I am looking to buy a 3/16 or therabouts Carbide spade drill bit, what is the best source? I have done the Goggle search and besides McJings I can't find anyone one else in Oz besides Blackwoods.
    CHRIS

  2. #2
    BobL is online now Member: Blue and white apron brigade
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    What are you intending to drill?

  3. #3
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    Saw Plate
    CHRIS

  4. #4
    BobL is online now Member: Blue and white apron brigade
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    Quote Originally Posted by Chris Parks View Post
    Saw Plate
    It can be drilled with a concrete carbide tipped bit in a drill press using slow speed, lots of coolant/lube and high pressure.
    I prefer to drill from both sides (Drill from once side till it breaks through the the other side and back and forth) as it seems to help the carbide stay together.
    Either way expect to destroy a bit or even in the process but they are cheap enough unless you need to drill lots of holes.

  5. #5
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    I can buy a carbide bit for $20 and it won't be destroyed so I don't see the point of using a masonry drill bit. I was hoping to find one smaller than the 5mm which is the smallest McJings stock.
    CHRIS

  6. #6
    BobL is online now Member: Blue and white apron brigade
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    Quote Originally Posted by Chris Parks View Post
    I can buy a carbide bit for $20 and it won't be destroyed so I don't see the point of using a masonry drill bit. I was hoping to find one smaller than the 5mm which is the smallest McJings stock.
    Depends how may holes you want to drill.
    If you just want a few holes, small concrete bits are a lot cheaper than $20.
    A set of 15 bits (3 to 10mm) at bunnings costs less than $8
    But I see bunnings only has metric concrete bits and I assume you want a 3/16" hole?
    Same with their tile drills which are spade like carbide bits
    What about a 4mm carbide and a needle file?

    Have you tried a cobalt bit - it depends on how hard the saw plate is but I have drilled some saw plate with a cobalt bit.
    Once again slower than usual seed, high pressure and lots of lube coolant.

  7. #7
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    Quote Originally Posted by Chris Parks View Post
    I am looking to buy a 3/16 or therabouts Carbide spade drill bit, what is the best source? I have done the Goggle search and besides McJings I can't find anyone one else in Oz besides Blackwoods.
    Hi Chris,

    I have been buying the 3/16 carbide spade bits from Isaac at Blackburn tools, they cut through saw plate like butter.

    Blackburn Tools - Solid carbide spade drill bits

    If you have good diamond grinding facilities, I daresay you could rework a masonry bit in the manner Bob is suggesting.

    Also
    3/16" Solid Carbide Spade Drill

    More expensive

    Straight Flute/Spade Drills | Travers.com

    Not much in Australia unfortunately.

  8. #8
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    hi chris how are you??whats wrong with with just a normal carbide drill?
    azz

  9. #9
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    Quote Originally Posted by azzrock View Post
    hi chris how are you??whats wrong with with just a normal carbide drill?
    azz
    With a normal carbide twist drill, the edges chip too easily.

  10. #10
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    Quote Originally Posted by RayG View Post
    With a normal carbide twist drill, the edges chip too easily.

    Nice ray . The edges of the drill?
    What about straight flute ones


    Sent from my iPhone using Tapatalk

  11. #11
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    Quote Originally Posted by azzrock View Post
    Nice ray . The edges of the drill?
    What about straight flute ones


    Sent from my iPhone using Tapatalk
    Never tried straight flute, it was easier to just use carbide spade bits.

  12. #12
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    Default straight flute

    Quote Originally Posted by RayG View Post
    Never tried straight flute, it was easier to just use carbide spade bits.
    ive used one a bit about 5mm to drill holes in what i think are hss hack saw blades
    it worked great
    azz

  13. #13
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    Thanks for all the suggestions, I was really trying to buy in Oz but it looks like Blackburn Tools are the easiest source to use. I used to have access to a CNC punch press but sadly no longer, such is life.
    CHRIS

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