I have indeed done this when my South African origin bench grinder and pillar drill lived in my American workshop for five years. Suitable 230V sourced and supplied.
Both ran 20% faster. No problem other than I couldn't use the highest speed belt setting on the drill - it stalled the motor. It was on this board that I said at the time (2003?), the grinder ran sweeter on 60Hz than 50Hz - yes the wheels were rated for the increased speed.
Both now happily consuming 250V (last time I checked), 50Hz here in greenest Oxfordshire, UK.
