Abstract: A dual purpose grinding machine for use in grinding the blades of the blade cylinder, or the bottom blade, of a cylinder type mowing machine, selectively. The machine has a grinding wheel head with a cylindrical grinding wheel and a cupped grinding wheel, the two grinding wheels being usable selectively. The grinding wheel head is traversable on guides, and means for mounting a blade cylinder for rotation and means for mounting a bottom blade on the machine for grinding are arranged in parallel relation to the guides.

Abstract: A grinding machine for cylinder type mowing machine blades, the machine including an arrangement for indexing the blade cylinder around from one blade to the next so that it can be completely relief ground in one operation without the intervention of an operative. The machine includes a grinding wheel head which can be traversed to and fro on guides to grind each blade in turn, and a motor unit and a clutch device for driving the blade cylinder when it is required to index the cylinder around from one blade to the next, the motor unit and clutch device being controlled by electronic signals given by proximity switches responsive to the position of the grinding wheel head and to the positioning of the blade cylinder.