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Nephogram of the abrasive speed gradient at the entrance of the ring was maintained with different numbers of grooves: (a) 18, (b) 24, (c) 30, (d) 36, (e) 42, (f) 48. Range of abrasive velocities at the position of the retaining ring abrasive entrance with different groove numbers: (g) Range of abrasive velocities at the position of the retaining ring particle entrance with different groove numbers.
