large slate slabs

[jindru]

hi i have a customer who has had a large patio laid in slate .the slate is more slab than tiles. various thicknesses 1" to about 3" the steps on the patio have been cut very cleanly but left with an edge like a razor.can the edge be bullnosed say with a router or would a cup grinder be best to chamfer edge? all sugestions welcom except the rude ones cheers.

 

[Time's Ran Out]

How dense is the slate?
I'd suggest an angle grinder to gradually aris/round the edge - but practice first.