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Te choice of fit has a bearing on the ease of assembly or holding power of the related components and can also have a bearing on the basic fitting routine.
Did you know?
When a component is measured, the temperature of the component and the measuring instrument have to be the same. Tis temperature is standardised at 20 °C and is called room temperature.
Caution
A component measured while hot, because of the machining process, would be smaller when cooled down to normal temperature. (Hot components are larger than components that have cooled down). In precision engineering where accuracy is extremely important, special air-conditioned “tool rooms” with a constant temperature of 20 °C are used for machining and measuring.
maximum diameter of hole minimum diameter of hole
tolerance on hole allowance basic size hole
shaft
maximum shaft diameter minimum shaft diameter
tolerance on shaft tolerance zone for the shaft tolerance zone for the hole Figure 3.1 Tolerance and allowance on a shaſt and hole