SDS drill is the way to go. They turn slowly, but hit much harder than an a conventional old-style hammer drill. The difference is almost unbelievable the first time you use one.
For 5/16 holes, any SDS drill will be fine. If you drill bricks, going for an overpowered SDS drill will tend to cause problems with knocking the back out of the brick when part-way through: a problem with brick-built houses here in the UK, but maybe less of a problem if that's not a construction method you encounter. I find anything over about 2J of impact energy is too much for brick, but for drilling bigger holes in concrete, more impact energy is good.
The cheapest import SDS will drill stone/brick/concrete much better than even the most expensive combi drill, so if you are not going to use it much, buy a cheap corded one under 2J.
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I'm looking for the right tool(s) and method for drilling holes in/through rocks. I'm not talking about the ground, or bedrock, or rock walls, or small pebbles to string on a neckace. I'm specifically talking large movable rocks, say 1 foot cubic.
I realize the type of rock could affect things, etc, but I assume I would need something like a drill press and then perhaps a method of cooling the drill bit, like water or antifreeze or similar. Are we talking masonry bits, or something much much different?
Basically, I would like to take a large rock, and drill a nice 1/2" hole right through it completely. Pointing me towards resources is perfectly acceptable, but most things I've found on my own have been of the "drill through bedrock to make a well" type things.
How do I drill a hole through a rock? Details inside.
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