The 3M™ Roto Peen Mandrel grips small flaps containing captive shot for peening of fine tolerance metals components. For use with flap assembly, we offer three sizes for internal diameters and flat surfaces.
Used today primarily for aerospace applications, the 3M™ Roto Peen Mandrel comported with a flap assembly allows use of a die grinder or disc sander to perform captive shot peening to repair metal surfaces. The assembly consists of tungsten carbide shot bonded to a flexible polymeric flap gripped by the mandrels attached to the power tool. The spinning flap is held near the surface so that the captive shot hammers the metal surface with each revolution.