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By Ian Bradley

ISBN-10: 0852424639

ISBN-13: 9780852424636

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Additional resources for BEARING DESIGN AND FITTING (NEW REVISED EDITION)

Sample text

Oil cups are sometimes fitted in the inverted position, as illustrated in Fig. 32, and the lubricant is then carried through a hole in the bush to the shaft by 37 BEARINGS AND HOW TO FIT THEM means of a felt pad, maintained in contact with the shaft by a light spring. This form of lubrication is applied to the spindle bearings of small electric motors, but replenishment of the oil is required more often than when a large wool-packed reservoir is employed for maintaining the oil supply to the bearings.

In first-class work, the maximum diameter allowed for a I in. 000 in. 001 in. 001 in. 999 in. 003 in. Although sufficient working clearance is, of course, essential, excessive ciearance may in some bearings be highly undesirable, and methods are therefore adopted to reduce the maximum clearance that may occur when a standard system is in use. In the first place, manufacturing practice aims at machining parts as far as possible to dimensions midway between the upper and lower limits imposed by the system.

Ring-oiling is a useful method of maintaining a constant supply of oil to a rotating shaft. Here, as shown in Fig. 29, a loose metal ring is carried on the shaft in a gap formed in the bearing bush. The ring dips into an oil reservoir and, as it is rotated by the revolving shaft, an abundant and continuous supply of oil is carried up to the bearing. Tne edges of the gap formed in the bush should be relieved to facilitate entry of the oil between the bearing surfaces, for a sharp edge in this situation would tend to scrape off the oil from the shaft.

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BEARING DESIGN AND FITTING (NEW REVISED EDITION) by Ian Bradley


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