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Thread: Carbide Spade Drill Bits
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5th May 2017, 11:07 PM #1Golden Member
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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
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6th May 2017, 07:25 PM #2Member: Blue and white apron brigade
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What are you intending to drill?
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6th May 2017, 07:57 PM #3Golden Member
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Saw Plate
CHRIS
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6th May 2017, 09:44 PM #4Member: Blue and white apron brigade
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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.
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6th May 2017, 09:54 PM #5Golden Member
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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
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6th May 2017, 10:28 PM #6Member: Blue and white apron brigade
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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.
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7th May 2017, 01:46 PM #7
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.
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7th May 2017, 02:10 PM #8Most Valued Member
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hi chris how are you??whats wrong with with just a normal carbide drill?
azz
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7th May 2017, 02:20 PM #9
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7th May 2017, 03:10 PM #10Most Valued Member
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7th May 2017, 03:13 PM #11
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7th May 2017, 09:12 PM #12Most Valued Member
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14th May 2017, 10:36 PM #13Golden Member
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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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