Forum: Reliability & Maintainability Questions and Answers

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Posted by: Frank
Date posted: Mon Mar 5 15:46:42 US/Eastern 2007
Subject: ASQ CRE Exam Prep
Message:
Does anyone have experience with e-learning classes or other methods of preparing for the ASQ CRE exam?

Replies: (list all replies)
ASQ CRE
Lianxi Mon Mar 5 17:19:01 US/Eastern 2007
ASQ CRE Exam Prep
Rushabh Mon Mar 5 17:19:46 US/Eastern 2007
ASQ Exam
Ken Mon Mar 5 17:21:48 US/Eastern 2007

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Posted by: Jean Capmeil
Date posted: Mon Mar 5 15:45:04 US/Eastern 2007
Subject: MTBF
Message:
I need some help.
MTBF = [total operating time]/[number of failure].

If I know the [total maintenance time] can I say that : [total operating time] = [total time] - [total maintenance time]? If yes where can I find the equation in Reliability Toolkit, MIL-HDBK-338, etc? Thanks

Replies:
MTBF
Ken Mon Mar 5 17:17:37 US/Eastern 2007

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Posted by: John Cloarec
Date posted: Mon Mar 5 15:43:53 US/Eastern 2007
Subject: MIL-STD-882 Rev E
Message:
I've heard about an update of MIL-STD-882 from Rev D to rev E. Does anybody has any information ?

Replies:
MIL-STD-882 Rev E
David Dylis Mon Mar 5 17:12:57 US/Eastern 2007

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Posted by: Sadat
Date posted: Mon Mar 5 15:42:37 US/Eastern 2007
Subject: Lead-free Solder Joint Reliability
Message:
Lead-free solder joints (RoHS initiativet)


Are these joints reliable for long-term operation taking into account the environment the equipment goes in (CO, CPE or Outdoor)?

Is the long-term reliability restricted to certain packaging styles (BGA, PLCC, TSOP etc.) or the board material (FR-4, ceramic)?

Are these devices free of hazardous substances reliable for long term.

Replies:
Lead Free Solder
bwd Mon Mar 5 17:15:34 US/Eastern 2007

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Posted by: Shanta
Date posted: Mon Mar 5 15:36:45 US/Eastern 2007
Subject: HALT test motors
Message:
Does anybody know how to perform a HALT test on motors?
We are trying to simulate the wearout of bearings and brushes. The motor manufacturer data sheet claims the MTBF of bearings is 50000 hours under nominal load conditions at 10000rpm. There is no description of what "nominal load condition" is. We would like to test this claim. How do we set up the test? Thanks for all the help in advance.

Replies: (list all replies)
RE : HALT test motors
Rushabh Mon Mar 5 17:14:40 US/Eastern 2007
Motor Reliability Testing
bwd Mon Mar 5 17:16:26 US/Eastern 2007

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