Tolerance

Tolerance defines the range of values in which a measurement is acceptable.

Before doing this section you should revise the National 4 Lifeskills Maths section on Tolerance.

Example

A part is to be produced for a TV set. It is intended to be 56.1mm long.

The part has tolerance 56.1 + 0.4mm

This means that the largest acceptable size for the part is 56.1 + 0.4 = 56.5mm

The smallest acceptable size for the part is 56.1 - 0.4 = 55.7mm

Question

A part for a washing machine is to be made to the length specification 45.9 + 0.3mm.

The constructed part is 46.1mm. Is it acceptable?

Largest acceptable size is 45.9 + 0.3 = 46.2mm

Smallest acceptable size is 45.9 – 0.3 = 45.6mm

As 46.1 is between these limits then the part is acceptable.