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Which details must be included in drawings for a product to be manufactured?
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Figure 1: Two techniques of representing an object. (A) Perspective drawing, suggesting that the object is cubical. (B) Orthographic top and front views, revealing that the object is not cubical.
To manufacture a product effectively, a set of drawings must provide all necessary information so that workers can execute the design without needing to make decisions or ask questions regarding particulars. These documents must clearly convey functional requirements, regulatory restrictions, and assembly procedures.1
Key details included in these drawings are:
- Shape and Size: Detail drawings describe the exact shape and size of each individual part, while assembly drawings indicate how those parts fit together.2
- Dimensions and Tolerances: Drawings must provide all necessary dimensions so that personnel do not need to add, subtract, or estimate distances. Because perfect precision is impossible, designers must specify tolerances—the acceptable range of variation for a feature—to ensure parts function correctly.3
- Materials and Finishes: Specifications regarding the materials to be used and the required surface finishes are essential components of the documentation.3
- Internal Details: When necessary, section drawings are used to clarify interior details or the fitting of components by showing the object as if it were cut by a plane.2
Ultimately, the goal is to communicate the engineering intent clearly, ensuring that all mechanical properties and assembly requirements are satisfied.1