Sheet Metal Press Working Dies
Figure depicts various types of tool bit grinds. It must be noted that edges involved in cutting operation should be the only edges permitted to touch work piece. All other faces must be ground so that they will not interfere with the cutting action.
Figure: Various Types of Tool Bit Grinds
Work holding devices such like jigs and fixtures are utilized for holding the workpiece. Jig is work piece holding and locating device that positions and guides or controls a cutting tool. Drill jig makes it possible to ream, drill and tap hole at faster speed and with great accuracy as compared to that of conventional hand methods. Fixture is work piece locating and holding device utilized with machine tools, welding, inspection and assembly. Fixture takes care of correctness of work piece to be machined and operators fatigue is also taken care by fixture itself. Fixture is always fixed to machine or bench. Table shows the historical development of materials and manufacturing processes.
Table: Historical Development of Machine Tools and Related Devices
