The central feature of the MT machine series is the geometry of the rotating barrel. The inside wall of the barrel features specially contoured ridges, while the bottom is shaped in the form of a three-sided pyramid. This unique design creates the innovative "multi-tumbling" action of the different barrel elements: when the drum rotates, the ridges on the internal wall of the barrel tumble and mix the work pieces. At the same time the pyramid causes the parts at the bottom of the barrel to move to the top of the mass. This multi-tumbling action ensures that the blast stream reaches all surface areas, thus producing even and consistent blast results. Brightly cleaned parts surface, free of sand, rust or scale, are achieved in short cycle times with an MT system with a highly consistent finish.