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Cam fasteners

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spitfire50 Paul Mugford
Rochester, N.H., USA   USA
In reply to # 1501552 by clshore Please note the number of OEM cars and trucks that employ safety wire.
And how often do the critical fasteners come loose?

Carter,
I think the use of hardware locking systems on modern automobiles is as much a matter of making sure fasteners that don't get fully torqued stay in place as maintaining the correct torque on the vast majority that are properly done up in the first place.
All the best,
Paul

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clshore Carter Shore
Beverly Hills, Florida, USA   USA
In reply to # 1501626 by spitfire50
In reply to # 1501552 by clshore Please note the number of OEM cars and trucks that employ safety wire.
And how often do the critical fasteners come loose?

Carter,
I think the use of hardware locking systems on modern automobiles is as much a matter of making sure fasteners that don't get fully torqued stay in place as maintaining the correct torque on the vast majority that are properly done up in the first place.
All the best,
Paul

Answer1: NONE of the OEM use safety wire.
The VAST majority use no mechanical locks whatsoever.
Instead, the fasteners are either engineered to not loosen, or an anaerobic adhesive is employed.
Answer2: Amazingly, they stay put.

Fastener torque is assured by specialized tools, many of which are multi-spindle devices which monitor and tighten each individual fastener,
capturing and recording the event into a SCADA production control data store in realtime.
Issues with the tools, the process, and the results are detected in realtime, and if needed the whole line can be slowed or even halted.
The cost of in-service product failures, recalls, and re-work can easily become 10x or even 100x that of the parts produced.

Lest you think that the task of tracking and storing the data associated with every single fastener is enormous, impractical, and too expensive,
let me assure you that it is not.

My day job is working with Big Data (Hadoop, etc.), basically the largest computing systems that exist today.

Ever shop on Amazon, and up pops up a message like "You may also be interested in XYZ ..."?

That's because the Big Data system on the other end captures the metadata from your browser; every mouse movement, every click,
every page, every screen, every search that you have done. It also can figure out your approximate geographical location,
and 'guess' with a high degree of accuracy your gender, your age, your socio-economic level, marital status, how many children, political affiliation, etc.
From this, it will choose and present to you one or more of the most profitable products that you are likely to also purchase.
It does all of this in a small fraction of a second, for every online session in progress on the website, at a cost of a fraction of a cent.
It does not sleep, it does not eat, it does not take breaks, it does not complain, it just does it's job, 7x24x365.

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