High speed impacts of a properly chosen micro-particle on a mechanical part may prove to be an effective mechanism for machining at small length scales.  Abrasive particles may be used to remove material precisely.  Alternatively, impact of a small particle on a part of a compatible material could be used to add material, especially metal nanoparticles.  In order to implement this process, it is first necessary to develop a repeatable process for creating well-controlled impact events.  We have developed a projector capable of firing small pellets supersonically for use in impact machining operations and thin film surface deposition.  Experimental data is compared to results from numerical simulations in order to completely characterize the physics involved in firing nanoparticulates.  In addition, we present the results of high speed impacts resulting in significant plastic deformation in the target material.