Gigit - you are thinking of CNC equipment.

Tolerances are a very interesting subject (although some might find it akin to taking sleeping pills). Every assembly design has to take into account the inherent tolerances of each manufacturing process and of the assembly process itself. Things get really interesting when you add dimensional variation caused by thermal or mosture-related characteristics, wear patterns, and structural tension/compression.

As an architect I work in the construction industry. All of those above factors certainly impact on building design. To get control of them, "systems" are developed that keep designers from having to reinvent the wheel every time. For instance, masonry cavity wall design has relatively well-established practices relating to dealing with tolerances and accommodating the relative movements in the various components.

It is the introduction of new ideas for materials and assemblies that brings excitement to the design process. It can require the designer to really understand all nuances of a design in order to get things right. That challenge can be very exciting and intellectually rewarding. Design activities that result in tangible objects, be they something you can hold, a bridge, or a building -- can be very thrilling.

Regards, Ross

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