Feature: Enclosures
IP criteria for PBSI 19 11
Fitting the box Once the particular enclosure is selected, the next step is to design the PCB to fit the box. Selecting the enclosure first is far more efficient, cost-effective and time-saving. When designing circuitry to fit the
enclosure, the style and size of the end product are thus well-defined. Of course, it is important to ensure reliability of quality and continuity of supply. Price is obviously important: cheap may be attractive initially but, as many OEMs have found to their dismay, buying cheap can mean buying twice. In order to make a standard enclosure
suitable for a specific application, it may need to be modified. The best option is
for the original manufacturer to provide a modified enclosure, configured to the specific requirements of the project, so there is no need to over-order to allow for setup and wastage quantities. Enclosure manufacturers will typically be able to provide milling, drilling, punching, engraving, screen printing, painting and EMC coating for their range of standard products. Manufacturers of moulded enclosures can normally also offer enclosures moulded in custom colours to meet any applicable identifying requirements or corporate branding needs. Detailed technical information and CAD drawings for all
Hammond products are freely available on its website. In taking a logical approach to the
system design it is common sense to choose first the item most difficult to alter at a later stage. It is a fallacy to assume that in the last stages of the project design, it will be easy to find an appropriate enclosure from the thousands available. Whilst components and circuitry can often be reorganised so the internal form changes while still maintaining function, the size, style and shape of the enclosure is fixed. The moral, of course, is to choose the
enclosure first.
www.electronicsworld.co.uk November/December 2020 63
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