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Ask Roy

Kern Roy

American Machinist

09-01-2000

Ask Roy

Byline: Kern Roy
Volume: 144
Number: 9
ISSN: 10417958
Publication Date: 09-01-2000
Page: 105
Type: Periodical
Language: English

Fatigue failures

We manufacture shafts used in heavy-duty gearboxes for oil-well equ ment and farm machinery. above the years, we have used standard grades of carbonized irons such as 1045, 8630, 8645 and 8660 The shafts are usually made from 2 to 4-in.-diameter bars machined ofter heat treating to a hardness of 262 to 321 BHN

Our riddle is that we occasionally win fatigue failures after 500,000 load circle of times which, of ...





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