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Thread: Cutting Granite on shopbot?

  1. #1
    Join Date
    Mar 2006
    Posts
    7,832

    Default Cutting Granite on shopbot?

    I have never done it and wondered if it can be done without tearing everything up? I was going to buy a piece for a countertop and cut out a sinkhole. How do you treat the inside cuts for an undermount sink?
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    Words of Wisdom:
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  2. #2
    Join Date
    Mar 2004
    Location
    Delray Beach, FL
    Posts
    3,708

    Default

    Forget it Jack. Wrong machine, wrong tooling.
    Needs to be done with very expensive diamond bits and constant water.

  3. #3
    Join Date
    Apr 2013
    Location
    Kennebunkport, Maine
    Posts
    4,420

    Default

    I agree with Dave, Jack.
    Granite is roughly a 7 on the Moh's hardness scale and I only use diamond wheels or sintered diamond cutters in the Foredom at that hardness with continuous water on the cutter.
    I've cut Slate when there were no harder inclusions, but unless I can scratch it with a US penny, I'd give the stone a pass.
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    scott P.
    2013 Desktop/spindle/VCP 11.5**
    Maine

  4. #4
    Join Date
    Mar 2004
    Location
    North Plains, Oregon
    Posts
    473

    Default

    Marble yes, granite no.

  5. #5
    Join Date
    Feb 2011
    Posts
    344

    Default

    Diamond tipped hole saw - Might go into sticker shock depending on the size/brand.
    Doug

  6. #6
    Join Date
    Mar 2006
    Posts
    7,832

    Default

    SEE...this is why you always ask the experts who know! I will buy my countertop from someone who has the ability to cut it also. Thanks guys....
    Words of Wisdom:
    “Words that sink into your ears are whispered…… not yelled”
    “The biggest trouble maker you’ll probably ever have to deal with, watches you from the mirror every morn’n”
    “The only difference between a rut and a grave is the depth”
    -----------
    Just remember...when it's time for the hearse to pull up..there's no luggage rack on top!
    -----------
    The beauty of the Second Amendment is that it will not be needed until they try to take it...Thomas Jefferson

  7. #7
    Join Date
    Feb 2011
    Posts
    344

    Default

    Simple holes are no problem, but if you want any kind of shaping other than a hole, specialized tooling is required.
    Doug

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