Blast cleaning machine

In a blast cleaning machine for shot blast cleaning parts, said machine having a main frame, a housing supported in a stationary position on said main frame, a barrel having an open end and a longitudinal axis extending through said end, said barrel being movably mounted in said housing for movement to a part tumbling and blast cleaning position in which said axis extends upwardly toward said open barrel end, means for rotating said barrel about the longitudinal axis thereof, and means in said housing for impelling a stream of shot into the open end of said barrel in said blasting position thereof, said barrel having an annular side wall assembly consisting of a plurality of connected arcuate sections having inner surfaces that cooperate to form the internal side wall surface of said barrel, each of said internal surfaces having leading and trailing portions which are substantially straight and are relatively arranged so as to form an obtuse angle therebetween, said leading portion being ahead of said trailing portion in the direction of rotation of said barrel during rotation thereof to tumble parts therein, said leading portion terminating in a surface portion which extends radially outwardly of said barrel at the leading end of said leading surface portion, said barrel having a bottom surface which is divided into relatively inclined sections, said side wall surface portions, and said bottom surface sections cooperating during rotation of said barrel about the longitudinal axis thereof in said blast cleaning position of said barrel to provide for a tumbling flow of parts in said barrel in a direction substantially diametrically thereof and through said stream of shot.