By Michael J Neale

The popular reference paintings is a realistic consultant to the choice and layout of the parts of machines and to their lubrication. it's been thoroughly revised for this moment variation through major specialists within the sector.

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GUIDE TO GROOVING AND OIL FEED ARRANGEMENTS An axial groove across the major portion of the bearing width in the unloaded sector of the bearing is a good supply method. A 2-axial groove arrangement, Fig. 2, with the grooves perpendicular to the loading direction is an arrangement commonly used in practice. The main design charts in this section relate to such a feed arrangement. A circumferential grooved bearing is used when the load direction varies considerably or rotates, but has a lower load capacity.

2 With a self-aligning assembly (see example in Fig. 6): (A) ensure that the sphere is able to turn freely under the action of the misalignment force; {b) check that the static load capacity of the housing assembly is adequate; (c) note that the heat dissipation will be less than a force-fitted assembly and hence the temperature rise will be higher. 3 With a force-fitted assembly (see examples in Fig. OOlV^ inches); (b) check that the stacking of tolerances of housing and bearing (see Fig. 2 for details); (d) estimate the bore closure on fitting using the F factor from Fig.

CONCENTRIC W I T H THE S H A F T High speed bearings and rotor dynamics A10 ROTOR CRITICAL SPEEDS The speed of a rotor at which a resonant lateral vibration occurs corresponds to the natural resonant frequency in bending of the rotor in its supports. This frequency corresponds closely to the ringing tone frequency which can be excited by hitting the rotor radially with a hammer, while it is sitting in its bearing supports. If the supports have different flexibilities in, for example, vertical and horizontal directions, such as may occur with floor mounted bearing pedestals, there will be two critical speeds.

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