2007-11-02 10:34:26 · 11 answers · asked by Anonymous in Home & Garden ➔ Do It Yourself (DIY)
Start off with smaller diameter bits and work your way up to the correct size. One problem you'll have is the rocks in the concrete, too. Use a long, narrow cold steel punch and a hammer to break up rocks you run into as you drill the hole (it helps to hold the body of the punch with a pair of vice grips). Then continue with the drill bit.
An anchor hole is usually 1/2 inch in diameter. Start with a 1/4 inch masonry bit and drill as deep as you need the hole to eventually be. Then, widen it with a 3/8 inch bit. And finally use the 1/2 inch bit. Keep the drill at high speed and vary the amount of pressure you use (push hard, let off, push hard, let off, etc.). If the bit melts or gets eaten up, you'll just need a new bit. It happens and there's not much you can do about it.
It takes a while and it's very tiring. But, that is the best way I have found of accurately drilling anchor holes in concrete.
2007-11-02 10:42:24 · answer #1 · answered by Paul in San Diego 7 · 0⤊ 0⤋
Just go to your local tool rental place and rent a hammer drill and bit the size you need. Very easy. This is the tool designed for the job and it works great. I've drilled thousands of holes in concrete with this setup.
2007-11-02 16:41:26 · answer #2 · answered by The_inspector 2 · 0⤊ 0⤋
We drilled holes into our concrete for a low deck project and there is a setting on our DeWalt electric screwdriver/drill that has a hammer function (vs. a screwdriver function). If you have that function, make sure your tool is switched to hammer.
2007-11-03 05:22:08 · answer #3 · answered by goma1 2 · 0⤊ 0⤋
You need a hammer drill and concrete bits.
2007-11-03 01:35:47 · answer #4 · answered by cowboydoc 7 · 0⤊ 0⤋
Use a masonry bit (cobalt or carbide) and go slowly. Going slowly will stop you from melting the bit. Even pressure and water will also help.
2007-11-02 11:15:22 · answer #5 · answered by rocky5x5 2 · 0⤊ 0⤋
you wil lhave to go back to using a star bit and hammer or use a masonary bit in the drill, strongly reccommend the masonary bit it gets the job done quickly especially if used in a hammer drill. standard rotary bits used for steel or wood are too soft to use in stone
2007-11-02 10:44:10 · answer #6 · answered by robert r 6 · 0⤊ 0⤋
It sounds like you are not using a masonry bit to me, or perhaps the wrong type
2007-11-03 10:43:59 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Use a masonry bit with a carbide tip.
2007-11-04 02:04:05 · answer #8 · answered by John himself 6 · 0⤊ 0⤋
I think hammer drills are the best way.
2007-11-02 10:46:10 · answer #9 · answered by Jay w 2 · 2⤊ 0⤋
DRILL SLOW, and keep a small glass of water nearby, go slow, stop, wet the hole, go back in, go slow,stop, wet the hole, go back in, go slow.
2007-11-02 22:32:46 · answer #10 · answered by Anonymous · 0⤊ 0⤋