Guards and discs on angle grinders
Mar 04, 2016· Larger angle grinders are manufactured with lower revolutions per minute (RPM) than smaller angle grinders, so that the edge speed of the disc always remains around 70 m/s. Fitting a 14 inch (356 mm) cutoff disc to a 9 inch (230 mm) angle grinder will increase the edge speed excessively to at least 120 m/s (430 kmph).