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Paul - it depends on the width of the blade and the type of profile. For instance, if I recall correctly, for a simple concaving of a 7/8th inch wide blade a 10 inch wheel gives a wedge, an 8 inch...

Just out of interest, below is a diagram of blade hollows along with the corresponding wheel size that was used to grind them:

127600

They are from the notes of Ken Hawley, taken when he...