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Measure the dimensions of the bench grinder to determine the size of the hole that will need to be cut into the top of the bench. Mark the dimensions on the bench.
Cut out the hole. Start by drilling a small hole into each corner of the rectangle. Then, use a jigsaw to cut out the space between the holes. (To save the board being cut from the workbench, opt for a circular saw.) Consider using a jigsaw to cut the hole. The board cut out becomes a waste piece and a new board will be cut to achieve a tight fit into the hole.
Mount the bench grinder to either the piece that was removed from the bench or a new board cut to fit the hole. Then, cut finger holes into the board around the bench grinder.