I've got a new slate hearth for the fire. It's 20mm thick but unfortunately it's a bit too big and I'm planning to use a stone cutting blade on an angle grinder to cut it to fit. The slate will sit recessed inside an existing marble surround so the edges don't have to be particularly smooth but they do have to be straight.
First question - should slate be cut wet or dry? Do I have to provide a stream of water directed at the point of contact. Next - are ordinary angle grinder blades OK to use wet or will the blade disintegrate. Would I be better using a diamond blade instead? Finally - does anyone have any tips for keeping the cut dead straight?
Kit Jackson