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To correctly machine a part, it must be held in a fixturing setup that guarantees a definite location, or position, with respect to a part's datum points or surfaces. This must be repeatable, part-after-part.
This program, part of the Fundamentals of Tool Design video series, explores the various issues influencing the development of fixtures, as well as, the basic fixture types and classifications, modular fixturing, and fixture design cost-to-benefit ratio concerns.
The Fixture/Machine Classifications segment covers fixture types, and looks at milling fixtures, such as vises, clamps, and tombstones; lathe fixtures, including chucks, collets, and between centers turning; grinding fixtures, such as magnetic tables, and cylindrical grinding fixtures; and both internal and external broaching fixtures.
The Modular Fixtures segment details the use of component kits to quickly construct both t-slot and dowel hole/tapped hole modular fixturing systems.
The Fixture Cost-to-Benefit Ratio segment highlights this and many other major concerns in the fixture design development process.
By Mark Hamel