Choada_Boy Posted November 1, 2010 Share Posted November 1, 2010 Seriously. I have to drill 9/16" holes in a four inch thick slab of granite without breaking it. Questions: 1) Rotary hammer or hole saw? 2) What's the minimum distance I can space the holes using a rotary hammer and not expect cracking between them? Any other advice? Quote Link to comment Share on other sites More sharing options...
JosephH Posted November 1, 2010 Share Posted November 1, 2010 Wet, diamond core bit. Don't hammer drill. In fact, just take it to a countertop or headstone outfit and have them do it. Quote Link to comment Share on other sites More sharing options...
Choada_Boy Posted November 1, 2010 Author Share Posted November 1, 2010 That's what I was figuring I'd need to do. Renting the hole saw is pretty spendy for eight holes. Thanks!! Quote Link to comment Share on other sites More sharing options...
tvashtarkatena Posted November 1, 2010 Share Posted November 1, 2010 (edited) Beg to differ. Hammer drill works great. Done it a bunch a times. You're not gonna crack a 4" thick piece. Granite drills like buttah, btw. Regular hammer drill bit for granite - no diamond required. Water cooling advised. Now basalt.... Edited November 1, 2010 by tvashtarkatena Quote Link to comment Share on other sites More sharing options...
Choada_Boy Posted November 1, 2010 Author Share Posted November 1, 2010 Hmmm. 9/16th? Quote Link to comment Share on other sites More sharing options...
tvashtarkatena Posted November 1, 2010 Share Posted November 1, 2010 Oh shit...didn't catch that part. No experience here with that size. Quote Link to comment Share on other sites More sharing options...
ScottP Posted November 2, 2010 Share Posted November 2, 2010 http://www.ihs.issaquah.wednet.edu/teachers/fine/new_page_45. Quote Link to comment Share on other sites More sharing options...
Off_White Posted November 2, 2010 Share Posted November 2, 2010 I'm with Joseph on this one, drill press would be nice too, and patience is required. I did this in a lapidary shop at TESC a long time ago. You might do okay with the roto hammer, but I bet the hole will crater from the backside when the bit goes through, and the hole won't be as tidy. Quote Link to comment Share on other sites More sharing options...
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