=+41. A new surface finishing method has been developed for nanofinishing flat and three-dimensional workpiece surfaces. The authors of “Parametric Analysis of an Improved Ball End Magnetorheological Finishing Process” (J. Engr. Manuf., 2012: 1550–1563)

investigated how y 5 percent change in surface roughness was influenced by x1 5 rotational speed of tool core (N, in r/min), x2 5 magnetizing current

(I, in A), x3 5 working gap (D, in mm).

y: 47.68 39.80 80.69 34.12 45.10 x1: 400 500 500 600 500 x2: 5.0 2.3 4.0 5.0 4.0 x3: 2.00 1.50 0.66 2.00 1.50 y: 46.51 69.63 63.62 37.18 36.75 x1: 500 500 600 668 400 x2: 4.0 5.7 5.0 4.0 3.0 x3: 1.50 1.50 1.00 1.50 2.00 y: 49.94 45.86 70.64 54.75 24.97 x1: 500 500 400 600 600 x2: 4.0 4.0 5.0 3.0 3.0 x3: 1.50 1.50 1.00 1.00 2.00 y: 49.38 59.85 55.18 32.05 44.94 x1: 500 400 332 500 500 x2: 4.0 3.0 4.0 4.0 4.0 x3: 1.50 1.00 1.50 2.34 1.50