contact switch
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Re: contact switch
Re: contact switch -- Swiedmeyer	Post Reply	Top of thread	Forum

Posted by: Marky ® 02/15/2007, 07:55:46 Author Profile eMail author Edit

Randy is right...there are other ways to secure the nut than an expensive sensor. Investigate Tamper-Proof hardware. There are some that you can tighten and torque but break away when you try to loosen. Good Luck

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Re: contact switch
Re: contact switch -- Swiedmeyer	Post Reply	Top of thread	Forum

Posted by: randykimball ® 02/14/2007, 22:17:20 Author Profile eMail author Edit

Do you need to know remotely? If not there are indicators that are used in the aircraft industry to indicate if a bolt, nut, stud, pin, and so on have moved or been moved. These (I forget the names) come in a bottle and are applied with a brush similar to fingernail polish. The one we used to use is a bright blue/green. It dries thick and breaks with any motion or tampering. It can not be faked. An aircraft fastener company should be able to provide it. It is used in the inspection department of machine parts companies and is often required by the aircraft engineer. I think it is hot fuel proof. ... sorry, but I can't pull any more out of my brain on this subject. The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them.

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Re: Re: contact switch
Re: Re: contact switch -- randykimball	Post Reply	Top of thread	Forum

Posted by: Swiedmeyer ® 02/15/2007, 09:30:32 Author Profile eMail author Edit

Thanks guys for your responses, but I need a remote electrical signal. I have the circuitry to send the signal, just need the switch to activate. This will be used in addition to a security nut with break away head. I want a signal to be sent if the security nut is damaged or tampered with. I was hoping for something like a metal spring washer that the contacts would break when the force is removed. Any more ideas?

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Re: Re: Re: contact switch
Re: Re: Re: contact switch -- Swiedmeyer	Post Reply	Top of thread	Forum

Posted by: randykimball ® 02/15/2007, 17:22:36 Author Profile eMail author Edit

Only other realistic idea I have is to use the old faithful safety wire method as used in the (again) aircraft industry... EXCEPT... put a #22 insulated wire through the holes. If the nut turns on the bolt or the bolt head turns the wire is severed. The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them.

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