The fixed blade of a reel mower passes over the ground at a set height and the rotary cutters push the grass up against it, just missing the blade and passing over it very close so as to cut the grass. What is the ideal angle to grind on to the fixed blade at its front edge when reconditioning it? I realise the obvious fact that one should use the same angle as the blade had when it was new but unfortunately that doesn't answer the question. So could anyone tell me what this angle should be please? Should it be at right angles to the ground or something else? And how does the newly ground front face slope; away from the direction of travel on its top edge or towards it?