concrete cutting

any comments experience cutting 3 inch cut in stone with carbide resin blade is appreciated
I have to 2 cuts ( to lay bx cable in a stone wall ( I do not think stone is granite) probable Manhattan schist or Fordham gneiss) cut is in side wall of apartment ( dust problems?)
interest in using silicon carbide mainly for experimenting also
tia
peter
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I've had great luck using a 7 and 1/4 in worm drive saw with a diamond saw blade <http://www.dewalt.com/us/products/accessory_category_detail.asp?categoryID85>, like a hot knife in butter.
Dust will be a factor, have buddy hold a vaccum close to the cut sucking up the dust as it's created.
Good luck...
DAC

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