The drawing, a binding deliverable
Drawings concern parts (production drawing or detailed drawing) and assemblies (overall drawing). The drawing consists of different views of the object modelled in 3D. These views are completed with dimensions which include all geometrical specifications which define the part.
These drawings also include all of the part's specifics: material, general tolerance, applicable standards, colour, finish, etc.
The functional dimensioning phase
In the industrial design phase, the purpose of dimensioning is to define the dimensions, the relative positions of a part in relation to another, the relative positions of a part's surface, and acceptable variations of these dimensions, and to ensure the correct operation of the part. Tolerances are a delicate balance between the correct operation of the product and feasibility and industrial production cost.
Functional dimensioning helps to make a reasoned choice of tolerances (GPS, ISO). It includes dimensional tolerances (minimum and maximum dimensions) and geometrical tolerances (circularity, parallelism, evenness, etc.). The chain of dimensions is the tool with which designers can define dimensional tolerances.
PDCi's mechanical engineering services define this chain of dimensions ensuring that the chosen tolerances are suitable for the manufacturing processes and customer expectations.