he maximum interference in mm after assembly between a bush of size  mm and shaft of size  mm is

Concept:

Interference fit: Interference is the difference between the size of the hole and the size of the shaft which is always negative i.e. shaft is always larger than the hole size. Here the tolerance zone of the hole will be below the tolerance zone of the shaft.

Maximum Interference = Upper limit of the shaft – Lower limit of hole

Calculation:

Given:

Hole   mm, Shaft   mm

Upper limit of shaft = 30 + 0.04 = 30.04 mm

Lower limit of hole = 30 + 0.03 = 30.03 mm

Maximum Interference = Upper limit of the shaft - Lower limit of hole