Oscillating trough for shot blast

An oscillating trough for shotblasting, having a workpiece transfer portion, where workpieces are turned over and transferred downstream to a workpiece discharging portion, wherein the transfer portion includes:

• a depression defined by two surfaces X.sub.4 X.sub.5 extending from the bottom of the transfer portion upwardly and outwardly thereby making an inner angle of 80.degree.-100.degree.;
• and
• an arcuate surface S connected to the top of each surface X.sub.4 and X.sub.5 of the depression, each of the surfaces S corresponding to a curved plane with a radius in cross section of 70-100% of the radius of the largest cylinder inscribable in imaginary planes Y and Z each of a predetermined length, the plane Y at one end intersecting an upper end of the respective surface X.sub.4 and X.sub.5 with an external angle of 140.degree.-160.degree., and the plane Z at one end intersecting the plane Y with an inner angle of 120.degree.-140.degree..