NOTES ON INSTALLATION
When the requirements for bearing installation are being specified the following matters should be considered:
- Flatness of surface. As TEB bearings are stiff, the contact surface should be flat and irregularities should be kept small. A tolerance of ± I mm over the contact surface is normally adequate.
- Out of parallel. Where bearings are to be installed between preformed surfaces, the out-of-parallel tolerance between these surfaces should be specified to ensure that the combination of the bearings themselves added to the misalignment of the contact surfaces will leave sufficient rotation capacity in the bearing for working conditions. For thin bearings having a small rotation capacity, it may be advisable to form one contact surface after placing the bearings.
- Texture. The best contact surfaces are those that have a uniform texture and a high coefficient of friction. Smooth or slippery surfaces should be avoided. Where steel plates are used and corrosion protection is required, zinc spraying has been shown to be the most effective.
- Edge clearance. Contact surfaces should extend beyond the edge of the bearings to allow for tolerances on placing and ensure adequate edge support. A distance of 20 mm is generally sufficient.