Drill bit?


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Old 06-23-19, 10:11 AM
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Question Drill bit?

So recently bought a Tapcon hammer drill bit with carbide tip for concrete, the guy and homedepot said it would work for what Iím doing, Iím trying to install a latch on the corner of my house between the garage an house but itís rock not concrete, brick or block, I got about 1/2 inch in each hole before the bit was smoked, not exactly the best hammer drill that I'm using either, what exactly am I doing wrong or what type of bit do I need to use? Thanks
 
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Old 06-23-19, 10:17 AM
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They are just like using a regular bit trying to drill steel, it's an extremely hard material and those are not the best bits.

I have dozens of them, sometimes it takes a couple but they sharpen easy!
 
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Old 06-23-19, 10:22 AM
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Guess I will go buy some more and get a sharpener to then.
 
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Old 06-23-19, 10:40 AM
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Bits used for concrete, masonry, brick, and block need to be carbide tipped or they will dull instantly. They also cannot be sharpened.

A drill with a hammer function (hammer drill) will work better for drilling into rock when using carbide tipped bits. I am a fan of SDS hammer drills but a "screamer" hammer drill with a standard chuck will also work.
 
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Old 06-23-19, 11:54 AM
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You cannot use tapcons in rock. It's too hard for them.
You also need to use a diamond bit when drilling rock.

You may need to use lead shields in the rock to screw into.
 
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Old 06-23-19, 01:47 PM
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Any specific brand that you use or know the name of?
 
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Old 06-23-19, 02:13 PM
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Lead shields come in all sizes. You may want to use 1/4" - 5/16" - 3/8" galv. lag bolts.
The link below is for 3/8"s but they have all the sizes.

3/8" lead shields
 
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Old 06-24-19, 12:01 AM
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They also cannot be sharpened.
Sure they can, touch them up on the grinder until the carbide is gone, they last for years!
 
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Old 06-24-19, 03:26 AM
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FWIW...use water as a coolant as you drill. I've drilled a few holes on rock with a hammer drill using carbide tipped drills. Lot depends on he kind of rock!
 
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Old 06-24-19, 03:33 PM
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Those are a little think, if I am looking at the correct bits they are around 40 bucks a piece. The lead sleeves are cheep at least.
 
 

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