iglide® plastic bushings - tolerances

The 'Go-Side' of the gauge, press-fit into the bore, must pass easily through the bearing.

With the 3 point probe, the inner diameter of the bearing after pressfit must lie within the prescribed tolerance on the measurement plane (see Fig. 1.23).

Bearing is oversized before pressfit – check dimensions only after pressfit.

Removal of material when pressed into housing – add chamfer to housing bore, check bore size.

Bearing is over-/under-sized after pressfit – check housing bore dimension, check housing bore material. Softer bore materials (plastic, aluminum) can expand upon pressfit.

Operating clearances are too large/small – check ID of bearing after press, housing bore, shaft diameter.

Bearing noise/squeak – check shaft surface finish / possibly roughen shaft.

Bearing wears, material deposits on shaft – operating clearance may be too small / increase clearance.

Chattering noise – operating clearance too large, excessive speed / reduce speed and operating clearance.

Shaft wear – shaft material too soft / change shaft material or hardness, switch to alternative iglide material.

Bearing seizes on shaft – operating clearances too small, temperature or moisture may be causing material expansion.

Loss of pressfit – bearings overheated / axial secure bearing into housing or select alternative material grade.