Full text of "Modern Mechanical Engineering Vol-I"
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THE ESSENTIALS OF ECONOMICAL MACHINING 207 different kinds of operations are performed, or the jig plates may be changed for the operations of drilling or milling. The fixture may be rigid, or it may be made movable so as to present different faces of the work to the FLANGEHQLE JIGS SIDE VI£W CD PLAN OF TOP PLAN OF BOTTOM Fig. 42 .—Fixture for holding Feed-pump Check Valve tools. Stop pins and locking devices provide for precise settings on one or on several pieces of work held in tandem. Example of an Open Fixture.—Fig. 40 illustrates a plunger for a sensitive feed lever, and fig. 41 an open fixture for holding six levers while their ends are being milled to bevels. This is by Messrs. James Archdale & Co., Ltd., Birmingham. The levers rest in vees at one end, in which they