I recently saw a couple of youtube videos showing variations on sharpening garden shears with the type of thin disk used on angle grinders.
The first video
It looks impressive but I remember hearing several scare stories about grindstones and grinding disks which disintegrated with quite destructive effects when not used as intended.
Are there really suitable disks available for angle grinders, on which the sides of the disk can safely be used for grinding metal objects?
The second video
Shows a more heavy duty bench mounted setup also with a thin, large diameter disk, which seems to work well for grinding with it's flat face, rather than the edge.
Which, if any of these methods are considered reasonably safe?