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Telephone equipment

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048120
EISBN: 978-1-62708-225-9
... Abstract The pawl spring which was part of a selector switch used in telephone equipment failed. The springs were blanked from 0.4 mm (0.014 in.) thick tempered 1095 steel and then nickel plated. Numerous pits around the rivet holes were revealed by microscopic examination of longitudinal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001578
EISBN: 978-1-62708-233-4
... Abstract Vibration analysis can be used in solving both rotating and nonrotating equipment problems. This paper presents case histories that, over a span of approximately 25 years, used vibration analysis to troubleshoot a wide range of problems. Current testing Fans Generators Motors...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001499
EISBN: 978-1-62708-236-5
.... The analyst was told only that the gears were to be returned intact. Therefore, he could not section them. Neither a physical examination nor a metallurgical examination was performed. A telephone call was then made to the user. A list of questions and responses from this conversation...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001813
EISBN: 978-1-62708-180-1
..., had five coils and squared-and-ground ends, and were made of 5.5-mm ( 7 32 -in.) diam wire. Because both failures were similar, the analysis of only one will be discussed. The pawl spring shown in Fig. 4(a) was part of a selector switch used in telephone equipment. Three of these...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001584
EISBN: 978-1-62708-236-5
... vessel. Ammonium compounds Chemical processing equipment Explosions Fires Nitrates Spargers Titanium (Other, miscellaneous, or unspecified) failure A Case Study from the files of Dr. Charles Rau On 13 December 1994, two massive detonations leveled portions of an ammonium nitrate...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001147
EISBN: 978-1-62708-219-8
... bridge which spans the Charles River between Boston and Cambridge Massachusetts. The bridge carries Massachusetts Avenue traffic across the river to a point at the location of MIT. The bridge also carries communication equipment, including several thousand telephone circuits. This bridge is almost one...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003562
EISBN: 978-1-62708-180-1
... another and a stiffening of the spring. The accumulation of debris is also the main problem in the fretting of electrical contacts ( Ref 14 ). Because the oxide debris is nonconducting, interference or distortion of electrical signals can be generated in telephone equipment and also in computer...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003502
EISBN: 978-1-62708-180-1
... the design process that created the product, equipment, or system, as well as the physical failure itself. By using a systematic approach to the analysis, it is possible to review basic design issues and work toward the details in a progressive fashion. This helps to ensure that key points are not...