One of the main attributes of plastics materials is their ability to be moulded into a finished component with no need for subsequent work to be carried out. Complicated shapes, holes and undercut features can be moulded into the component using tooling and moulding techniques. However all this comes at a cost of tooling expense.
Moulding tools and forming equipment used in the various plastic moulding processes are invariably hand made one off creations. They can often take weeks and months to manufacture with a resultantly high cost. Where a plastics component is specified and the numbers to be used are not large, then machining the component becomes more economical. Not all plastics materials can be machined. The more rigid a plastic then the easier it is to be machined. The more flexible and the softer plastics are not suitable for machining.
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