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TOLERANCES FOR PARTS

NORMAL

ACCURATE

PRECISE

The required dimensions of mould can be achieved using normal tool making techniques.

Accurately dimensioned mould cavities are necessary.

High precision mould is required, depending on a product of sophisticated design: the final sizes of mould cavities are established after making a series of injection moulding trial runs.

Product dimensions can be achieved in multi-cavity mould.

Multi-cavity moulds can be used some times.

Single cavity moulds preferred.

Injection moulding conditions can be adapted for low cost manufacture.

Moulding conditions are more critical.

Moulding conditions must be carefully controlled.

Regrinds can be reused if required provided mechanical properties allow doing so.

Reuse of regrind is only possible to a limited extent and due observance of required mechanical properties.

Processing of regrind is not allowed.

No special inspections of final product size are necessary.

Random inspection of final parts are usually required.

Thorough inspections of final parts size are of vital importance.

Normal cost level.

Moderate additional cost.

High additional cost.

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