Generally speaking, the best way is with a hammer drill but it all depends
in what size hole you need, what type of rock it is and how deep the hole
must go. If it is brittle stone (slate, marble etc.) a hammer drill will
most likely shatter the rockand you will have to use a regular drill and
masonry bit. If you want a hole bigger than 1-1/2 inches, you will need to
diamond drill it. Most industrial drill bits can be extended to fairly long
lengths once the hole size is bigger than 1/2 inch.

Your best bet would be to gather your info and call an industrial supplier
or industrial rental house. Most of them have drills and bits for almost
every type of stone. If it's only one stone, renting the drill will be the
cheapest and you can most likely rent the bit as well. Try to stay with the
larger rental companies as most of them have been trained by the companies
that sell them the equipment to rent (Hilti, Hitachi, Bosch etc) and have
books on hand to help select the best bit for your hole. However, if your
locally owned rental shop may be able to help as well if they handle
industrial stuff.

Happy drilling.


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"Pat Keith" wrote in message
...
Whats the best way to drill thru a boulder?