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nuckollsr(at)cox.net
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 Posted: Mon Feb 12, 2007 12:23 pm Post subject: Theft deterrent . . . |
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At 02:42 PM 2/12/2007 -0500, you wrote:
| Quote: |
<pilot4profit(at)sbcglobal.net>
Or as in the case of current Cessna's, only 10 or 12 different cylinders in
whole manufactured fleet. Collect 'em all and you can fly any Cessna.(this I
learned from a Cessna sales person).
Effective theft control covers 2 areas of interest. For the aircraft itself
a good prop lock. The heavy chain and padlock is a deterrent only to casual
thieves. A set of bolt cutters will take one off in a couple of seconds.
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Depends on the chain. It DOES need to be hardened chain and
lock. These are materials you probably wont find at Home Depot.
My dad used to run a locksmithing operation and he sold the locks
and chains that could only compromised with grinding tools and
then only at considerable labor (and risk of exposure). The locks
used unsymmetrical, double cut keys with the damnedest broaching
profile I've ever seen . . . well beyond the picking skills of most
locksmiths and probably every thief.
Thefts from county road maintenance tool boxes and loss of portable
compressors stopped after a switch to materials that exceeded the
thief's patience and resources.
Bob . . .
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john(at)ballofshame.com
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| Posted: Mon Feb 12, 2007 12:39 pm Post subject: Theft deterrent . . . |
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You're dad was a locksmith. Neat....Lock picking is one of my hobbies.
Ever seen an ABLOY? I've never quite figured out how you would approach
picking one of these suckers.
http://www.abloyusa.com/
-John
| Quote: |
<nuckollsr(at)cox.net>
At 02:42 PM 2/12/2007 -0500, you wrote:
>
><pilot4profit(at)sbcglobal.net>
>Or as in the case of current Cessna's, only 10 or 12 different cylinders
> in
>whole manufactured fleet. Collect 'em all and you can fly any
> Cessna.(this I
>learned from a Cessna sales person).
>
>Effective theft control covers 2 areas of interest. For the aircraft
> itself
>a good prop lock. The heavy chain and padlock is a deterrent only to
> casual
>thieves. A set of bolt cutters will take one off in a couple of seconds.
Depends on the chain. It DOES need to be hardened chain and
lock. These are materials you probably wont find at Home Depot.
My dad used to run a locksmithing operation and he sold the locks
and chains that could only compromised with grinding tools and
then only at considerable labor (and risk of exposure). The locks
used unsymmetrical, double cut keys with the damnedest broaching
profile I've ever seen . . . well beyond the picking skills of most
locksmiths and probably every thief.
Thefts from county road maintenance tool boxes and loss of portable
compressors stopped after a switch to materials that exceeded the
thief's patience and resources.
Bob . . .
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rtitsworth
Joined: 16 Jan 2006
Posts: 76
Location: Detroit, Mi
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| Posted: Mon Feb 12, 2007 12:59 pm Post subject: Theft deterrent . . . |
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Portable, battery powered, Dewalt cutoff saws "eat" hardened steel easily
(Home Depot burglar supply).
Thus, it's not about making things thief proof it's about making your things
harder to steal than someone else's. i.e. you don't have to outrun the
bears - only the other campers (grin).
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nuckollsr(at)cox.net
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| Posted: Mon Feb 12, 2007 1:09 pm Post subject: Theft deterrent . . . |
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At 12:38 PM 2/12/2007 -0800, you wrote:
| Quote: |
You're dad was a locksmith. Neat....Lock picking is one of my hobbies.
Ever seen an ABLOY? I've never quite figured out how you would approach
picking one of these suckers.
http://www.abloyusa.com/
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I don't know if it was that brand . . . I think I recall
dad showing me a lock in American Locksmith that operated
on a similar principal. A challenge no doubt.
About 30 years ago I built an electronic lock for
a customer where the "key" was a connector having
a network of components under the backshell that
were potted into place.
A simple examination of the connector's exposed
pins with any test equipment only yielded a confusing
array of reactance values . . . no DC continuity existed
between any pins.
In fact, the networks were precision components
used to set the operating frequency of two
Wien-Bridge oscillators built into the receptacle
that accepted the key connector. The same single
shielded wire that carried the two signals back to
the control panel carried DC power out to run the
lock-oscillators. Even if one placed a 'scope on
the interconnection wiring, the mixing of two frequencies
made the pattern impossible to measure with anything
other than an audio spectrum analyzer . . . not a tool
that most thieves would have access to.
Electronically it was a fairly busy circuit but
easy to make robust. Never heard from the customer
again and my "lock box" was visible on the outside
of his building for a lot of years after I installed
it . . . I'm guessing it did the job.
The only other lock I built was a combination system
that accepted inputs from a keyboard. This was a simple
4-digit lock but the system would ignore all inputs until
the proper first digit was selected. It then took the next
three digits to complete the sequence. The lock featured
a 3-second time delay from receipt of proper sequence before
electric latch was retracted. This allowed the operator to
input a random sequence of digits in full view of anyone
watching.
You could put in as many digits as you liked while avoiding
the first digit of the opening sequence. After entering
the proper sequence, the operator continues to punch
digits at random until the lock operated.
He got a real buzz out of watching the confusion
on the face of his observers. For all practical purposes,
the "combination" was exceedingly long and never entered
the same way twice!
Bob . . .
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