Masonry bit? You can use a small one and drill multiple holes for smaller
openings, then break out the middle. Or drill corner holes and use a carbide
blade in a sabre saw. You can use regular steel bits and blades, but they won't
last long. A 1/8" carbide cutting bit in a dremel tool or other high speed tools
works very well. For longer straight cuts, score and break, or used a masonry
abrasive blade in a circular saw (but don't breath the dust).
On Nov 1, 9:20 pm, poison email@example.com wrote:
Harbor Feight has carbide coated hole saws that should make short work
of any of the cement boards. Even diamond in 7/16" and 3/4" sizes for
$3. Cat # 32399-9GBG. Latter ought to last quite a while. HTH
It is hard on regular hole saws, but they work quite well. It is
often easier to get an oversized piece of scrap pipe, support the
sheet well, and punch the pipe through the sheet with a hammer.
This method works just as well on drywall.
Keep the whole world singing . . . .
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