Abstract: A portable grinding machine for grinding or restoring a relief angle (34) onto the rotary blades of a grass mowing machine in a transverse reciprocal movement the grinding machine comprising a blade support means for automatically maintaining the rotary blades (2, 102) of said mowing machine in contact with the grinding wheel (5, 105) during the reciprocal movement of the grinding machine along a blade.

Abstract: A device for grinding a rotary mower blade (16), the device comprising an adjustable support for receiving a rotary mower blade, means for fixing the blade relative to the support, means for feeding the support and blade both axially and transversely relative to a grinding wheel (4), and for pivoting the support towards and away from the grinding wheel.

Abstract: A device for grinding the bedknife 6 of a lawnmower comprising a mounting bar 4, electromagnets 2 which are mounted flush with the top face of mounting bar, and end brackets 8. In use, the bedknife is placed on mounting bar and is held in place by electromagnets while end brackets are positioned relative to the bedknife and the bedknife secured to them. When a grindstone motor (not shown) is started, the electromagnets are automatically de-energized. After grinding, the grindstone motor is stopped and electromagnets are re-energized to hold a bedknife in place while the end brackets are detached. The electromagnets are then manually de-energized so that the bedknife can be removed from the device.