| Morris Dovey wrote: || || Marble can be machined with CNC routers. I would guess that || carbide-tipped bits with 1/2" or larger shanks are used. Spindle || and feed speeds would need to be chosen carefully, and there'd || need to be an effective cooling system to prevent overheating the || bit. | | I'd expect the cutters suitable for even soft stone to be grinding | cutters, not 'slicing cutters' like those used for wood or metal.
On the ShopBot Forum, at
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you can see a marble (pet) gravestone that was routed with a standard 90 degree V-cutter.
There's another discussion of routing marble with a photo at
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(mind the wrap). Note that in this instance the router was a Porter Cable running at 10,000 RPM and maximum depth of cut was 0.1". Between passes, the user softened the marble by wetting it with water (I just learned a new trick!)
|| My quick search turned up a granite (harder than marble, I think) || at
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- which will provide some || idea of what the machines look like. || || Some of my fellow ShopBot owners have used their machines to rout || Corian with very nice results - and I'd expect that material is || more like marble than granite. | | Isn't corian plastic? E.g. an organic polymer. Hardly comparable | to rock.
You got the first part right. It's not rock. For routing purposes, however, it's much like a soft rock (harder than soapstone, softer than granite).
-- Morris Dovey DeSoto Solar DeSoto, Iowa USA
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