Tile, Granite, Marble? nope I have not tried them with this bit. But I've used it to do the final trimming of aluminum and brass blanks on my router table with a steel template plate double glued to it. It works great for this purpose. Simply cover the cutter inlet with a piece of cloth to prevent metal dust from building up and apply some 3-in-1 oil to reduce friction and keep the dust together as it flies off the cutter. SLOWER. Make simple passes, setting up the router as slowly as possible, but this thing quickly eliminates about 1/16" excess on a 1/8" blank and keeps the final edge flush with the template. I've finally found a way to quickly and accurately form metal parts without having to buy a full CNC or milling machine. I messed up two less than excellent carbide tipped bits before finding this one: no rattling, no grabbing and throwing, no reasonable fear of physical harm as long as you take the proper precautions. I can't say anything about the durability, but I don't see any damage to the diamond abrasives in the three parts. However, they are fairly cheap; I'll probably save a few more to have on hand for light metalworking.
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