Apparatus for orientation of tool on workpiece

A tool that requires angular orientation about an axis perpendicular to a workpiece, where said tool is locked in a desired position relative to a nose piece secured to the workpiece, an adapter to receive a nose piece or similar device or a turret coupling between said nose piece and an adapter to receive a nose piece or similar device or said tool, said turret coupling being comprised of a sleeve fitting closely on the lower end of said adapter or tool, a retainer to hold said sleeve in place while allowing said sleeve to rotate relative to said tool, said means for securing said tool to said workpiece affixed to said sleeve, and a latching mechanism for locking said sleeve in position relative to said tool comprised of notches distributed on the rim of said sleeve which is fitted closely on said adapter or tool, a latch key which fits into any one of the slots distributed on the rim of said sleeve, a shaft for lifting said key out of a notch and clear of said rim, and spring biased means for actuating said shaft to lift said key when manually operated, said means having a spring exerting sufficient force to reinsert said key in a notch when released.