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Post by jackofalltrades on Jul 24, 2007 11:18:37 GMT -5
Hi, new here. I was recently given a yard of river cobbles for landscaping and saw some rocks that I thought would look nice as table top fountains. I got a masonry bit and discovered these suckers are HARD . I need to drill a hole 1/2 inch diameter and through the rock about 6 inches in depth (rock diameter is about 6 inches). I had someone suggest a diamond bit but the ones I have found are "hole" bits that only drill about 1/2 inch deep. Any suggestions? Thanks, Jack
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Post by Rebel KGC on Jul 24, 2007 17:02:20 GMT -5
Yo! ;D Sounds like you need carbide drill bits, dunno. Check out: www.itcbits.com or just do engine search: DRILL BITS FOR RIVER COBBLE ROCKS
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Post by beale on Jul 27, 2007 17:53:07 GMT -5
Have you thought of using masonry drill bits. Theydrill through concrete and you can get them up to about 18 inches or longer?
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Post by Hal S. on Jul 31, 2007 7:12:13 GMT -5
..A true rockhound, I have been trying to drill some holes in some flat "slab cut" carnelian. I was given approx. 25 small slab cut carnelian geode's or thunder eggs. I wanted to use them for wind chimes, More to look at then actually hearing them. I took a Dremel with a diamond bit and a Dremel "Drill Press" or " Work Station to drill the holes. Some say you need water as a coolant and create a pool or pocket for the coolant at the drill holes location. Set the Dremel on a very low setting and allow it to do the work for you. Do not force the bit. just make sure you keep the bit damp with water or as I use a cooling substitute. ( Lube Cool 4800) or equivalent. For just one hole, the process took me about 45 mins to cleanly drill through a very thin slab cut carnelian. NOTE: According to Mohs scale for mineral hardness, it lists as a 7, but after drilling these slab cut carnelian I would beg to differ.
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