Strasbaugh Prism Blocking Fixture

Design a precision aluminum blocking fixture for manufacturing prisms. The fixture shall hold six (6) prism bars simultaneously. All prism bars shall be: • Parallel • Equally spaced • Identically supported Prism Bar Dimensions Each prism bar measures: • Length: 167.64 mm (6.60") • Width (datum face): 25.40 mm (1.000") • Height: 45 mm The tooling will have six identical precision V-grooves. Each groove shall have: • Included angle: 90° • Side angle: 45° per side • Groove length approximately 178 mm • Full length parallelism • Identical depth Design the groove depth so that approximately 75% of the prism datum face is supported by the two 45° faces. The prism shall not contact the groove apex when placed into the tooling Each groove shall include a continuous relief groove: • Width: 3.0 mm • Full groove length • Flat bottom • Prevents the prism touching the groove apex The 6 V Groove Spacing shall be equally spaced. Provide: • 5 mm minimum clearance between adjacent prism bars. The rear surface shall be • Flat • Parallel to the groove centerlines • Used as the primary machining datum • Used as the polishing reference surface The rear face shall include a spindle drive pin pattern suitable for use on Strasbaugh-style spindle polishing machines Central Drive Hole Provide one precision spherical socket located exactly at the geometric center of the rear face. The socket shall: • Accept a ½-inch (12.7 mm) diameter spindle drive pin • Be produced using a ½-inch ball end mill • Be concentric with the fixture Also Provide eight additional hemispherical pin sockets. Requirements: • Located on a 1.50-inch (38.10 mm) pitch circle diameter • Evenly spaced every 45° • Same geometry as the center socket • Produced using the same ½-inch ball end mill • All sockets have identical depth

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