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Home arrow Engineering arrow Small Unmanned Fixed-Wing Aircraft Design. A Practical Approach

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More Detailed Model

The more detailed model is illustrated in Figure 17.21. This shows the added detail of carbon-fiber tube clamps, access holes, and example stringers for stiffening the skin. This entire geometry has been produced in the context of the input geometry from the higher level conceptual geometry. If this conceptual geometry changes, then the detailed model should change accordingly. However, there are limits to changes that can be made. If, for example,

Final detailed model

Figure 17.21 Final detailed model.

the topology of the part changes, then the detailed geometry is likely to fail because of a broken link to something that no longer exists.

Manufacture

This assembly can now be saved as a single body “.stl” file, which is the format used as the input for most additive manufacture machines. At this stage, certain other detailed features might be put into the geometry. For example, fillets might be defined between flat features. Unfortunately, fillets are particularly fragile features in parametric CAD models. It is therefore better to leave fillet features out of the parametric model to prevent errors on rescaling. Only when the higher level geometry has been “frozen” should the part be fully detailed by undertaking the (unfortunately tedious) task of filleting and the introduction of other minor details prior to manufacture.

 
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