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Unread 04-22-2015, 02:53 PM   #1
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Angle grinder speed for cutting porcelain

I need to cut some 6" x 24" porcelain tiles across the 6" dimension. I have a variable speed (max 10,000 RPM) angle grinder and a 4" continuous diamond blade. With the exception of one cut, the cut edges will be hidden.

1) What are the trade-offs between using a higher vs. lower angle grinder speed?
2) In order to make that one exposed cut fairly straight, is it possible, feasible, safe, to use something like a piece of wood clamped to the tile to help guide the blade?
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Unread 04-22-2015, 07:07 PM   #2
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Depends on the tile and the blade. The best it to experiment.

Then there is the issue of how much pressure to apply and the speed the tool is moved.....

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Unread 04-22-2015, 07:14 PM   #3
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Seems like some tiles will cut better on a fast RPM, some better and chip less on slow. The blade probably has something to do with it and how much wear the blade has and how much it vibrates. I would experiment with it.

Running the blade along a piece of wood does work. It may become crooked after several cuts with the diamond running against it. Just don't clamp it so tight that it breaks the tile.

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Unread 04-22-2015, 07:52 PM   #4
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Heat can cause a tile to shatter, so it depends on your technique and the tile. Water cooling can help, but not all grinders are safe with that.
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Unread 04-23-2015, 11:04 AM   #5
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Thanks for all the input. I'd better get to practicing techniques.
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Unread 04-23-2015, 11:45 AM   #6
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Have a look at post #27 on this thread, Hank. Review the rest of the thread, too. The blade can make a world of difference.

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