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Thread: how best to cut cultured marble?

  1. #1

    Default how best to cut cultured marble?

    Hello all,

    I have a 25" wide cultured marble sink that has to fit in a 24" niche. I've had some people tell me cut it with a circular saw with a fine carbide blade, others say use a handsaw (hacksaw?) for more control, and another said to use a belt sander. Anyone have any experience or preferences for one way or another? Thanks so much for your help.

    Dave in PA

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    You won't be able to cut it straight with a hacksaw. Do you have a router?

    Will the edges be covered with anything? THere is often a lip on the edges to help keep water from rolling off.

    Strap a straightedge to the bottom of the thing and use your circular saw.

    If you have a belt sander, you could use that.

    Do a search here...someone did this a few months ago (search is in the blue bar near the top).
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3

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    I would try a circ. saw with a diamond blade. You may need to cut it wet, but I'm not sure how to do that. I'm sure many others here can help you.

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default cut

    Almsot any saw will cut it. Your problem is really how to make a straight cut. I use a SawZall with a fine blade and proceed slowly. A belt sander afterwards will smooth the edge. An "abrasive" wheel such as a diamond blade will melt the material, and clog the blade.


    Designers Marble in Woodinville WA


    Last edited by Terry; 06-03-2010 at 05:17 PM.

  5. #5

    Default cutting culture marble

    Hi guys, thanks for the quick replies & helpful advice.

    In reply to some of your questions -

    the sink will butt up against walls on either side. This is a really small bathroom. The vanity/sink is in a sort of niche that is just under 24" wide. (I bought a 24" vanity and had to take it apart and reassemble it in the niche, because it wouldn't fit through the space assembled!). The walls are moisture-resistant sheetrock with the good moisture-resistant primer and paint.

    I don't own a router, but I know someone that does. I like the sawzall idea, gotta go pick up some fine blades.

    Thanks again!

    Dave

  6. #6

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    Dave,

    You may want to make a template first. It is often necessary to take a little off each side to get a good fit. As you found with the vanity, everything that should be is not always square.

    I would use a circular saw or a router, if using a circular saw, tape the cut line first. Use a straight edge to run the saw or router along. Use a mask, and do the cut outside.

    If you use a router, it is safest to use a bit with a shaft larger than 1/4 inch.

    Paul

  7. #7

    Default thanks Paul

    Template sounds like a good idea. How would you do the straightedge? Maybe clamp a piece of wood to the sink for the saw to run next to?

    Thanks again,

    Dave

  8. #8

    Default

    A good straight board works fine, offset to bring the blade where you want it.

    The trick is to get the fit where a small caulk line will fill the gap equally all around.

    Paul

  9. #9

    Default

    Quote Originally Posted by hj
    An "abrasive" wheel such as a diamond blade will melt the material, and clog the blade.
    Is this true? A diamond blade will melt cultured marble?

  10. #10

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    I would use a high toothed carbide, but see what some of the other guys say. It is resin so heat will melt it.

    Don't forget the finished surface is mm thin.

    Paul

  11. #11
    Retired Defense Industry Engineer jadnashua's Avatar
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    A diamond blade like used for tilework, is basically microscopic diamond dust. It cuts by grinding more than what we think of cutting. It would quickly clog up with a thermoplastic material. A carbide wood blade stays sharper longer, and would make a clean cut on cultured marble. A new good quality wood blade would do it too, but might get dulled some.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  12. #12
    Moderator & Master Plumber hj's Avatar
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    Default cut

    IF the 24" cabinet would not go into the space assembled, then you also have to cut the top slightly undersized so it can be tilted/twisted in.

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