I hope to have my surface grinder in a working condition over the Christmas period, but in advance of this I need to replace the wheel that it came with, which is both worn and potentially suspect as to safety. Having in the distant past used standard WA (Norton 38A/similar) wheels pretty exclusively this was my first choice until I came across the blue SG wheels. These would seem to offer more versatility to those of us limited to having just 1 or 2 wheels, albeit at a higher cost.
Anyone have experience or recommendations on these? And bearing in mind the different characteristics what would be an equivalent SG wheel to say an 60 or 80 grit J/K WA wheel? All my grinding would be dry, and would be on mild steel or P20 with the need to occasionally grind some cast iron. Wheel size is 7" and I would probably want just 2 widths, 1/2" and 1/4".
Peter