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Unit 6: Store Planning and Fixtures

6.4 Types of Fixtures Notes

Several methodologies have been developed for fixture planning to satisfy various constraints.
The main methods in four fixture planning phases are summarised in figure 6.5.

In the fixture analysis phase, several prominent methods have been developed including
geometrical, kinematical, force, and deformation analysis methods, rule-based methods and
feature-based methods. The geometrical analysis checks the locating errors and interference
among fixture elements, the workpiece and cutting tool paths by spatial reasoning. The
kinematical analysis ensures the determinant locating against locating planes, and the easiness
of loading/unloading. A sufficient clamp force is determined for static equilibrium under the
cutting force based on force analysis. The deformation analysis determines the elastic and/or
plastic deformation of the workpiece under the clamping and cutting force, which directly
affects the final dimensional tolerance of a workpiece. Finite Element Analysis (FEA) is usually
used for the deformation analysis. Similarly, these methods are used in the fixture verification
to justify the generated fixture configuration.

Figure 6.5: Summary of CAFP Approaches

Lab Exercise Go to website http://www.cadanda.com/CAD_5_1-4__424-433.pdf and gather
more information on CAFP Approaches.

In the fixture synthesis phase, the locating, clamping, and supporting layout are determined.
Various modular fixtures in store planning are shown in figures below.

Figure 6.6: 2-Tier Adjustable Rack Display

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