Abstract: A machine for driving a spring pin or other similar cylindrical object into a hole in a work piece. One pin at a time is automatically fed into a shuttle. The shuttle is moved laterally to bring the pin into alignment with a pin inserting punch. Upon subsequent movement of the punch, the shuttle with the pin therein is moved downwardly until the work piece therebelow is engaged. The punch continues its downward movement, entering the shuttle and driving the pin into the aligned hole in the work piece. The downward moveability of the shuttle enables pins to be driven into work pieces whose upper surfaces may be a different vertical levels. Adjustable means controlling the stroke of the punch limits the depth of insertion of the pin into the work piece.