Pay attention to the shape of abrasives wheel edge wearing down!
B.SQUARE Shape - This shape also proved correct cutting wheels choosen and also comes from cutting works especially when cut small solids, structural shapes, pipe and tubing.
C.CONCAVE Shape - Normal when using the correct wheel to cut tubing and thin-wall sections.
D.POINTED Shape - The abrasives on two-sides wearing down so fast- this indicates the wheel is too hard and most abrasives fly away by crush with the work-piece surface.
E. CHISEL Shape - Wet cutting problem. Usually indicates wrong application of coolant. May cause breakage and crooked cuts.
F. SIDE-GLAZED Shape - Also indicates wheel is too hard or cutting too slow. Requires excessive pressure and higher power to cut.