| 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
| 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
POST22151 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
POST12599 (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 http://www.cncmotion.com/granite.htm - 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
DeSoto, Iowa USA