Locks and chains resistant to grinders

[SnowyBoy]

Sorry to jump in on this so late, but I'm trying to think outside the box on this one as I was a secure door on my house that will resist EVERYTHING. But by trying to think of the hardest material I know, I went the other way with it.... what SOFT material could work?

Then I remembered some special trousers a tree surgeon friend of mine has... I forget what they are called, but by golly they are amazing! If the chainsaw even so much as touches the trousers it frays into a massive ball of fluff which halts the chain in an instant and protests your leg. I think this material INSIDE the cavity of a steel plate door would be the perfect combo to bind grinders and drills up completely as they will snag.

My other idea was an electrified, or flammable gas filled door to deter tampering, although the legalities (at least in my country) wouldn't allow for that :p

[mseifert]

You want to know what a true crime is.. Who ever thought this was a good way to get into this safe.. Makes my heart ache..

[YouLuckyFox]

Right, don't they put layers of copper in safes sometimes to prevent oxy-acetylene cutting (oxy-acetylene will only cut something that can rust) and bind up drill bits? Can't remember where I heard that, could've been in a movie.

[SnowyBoy]

Right, don't they put layers of copper in safes sometimes to prevent oxy-acetylene cutting (oxy-acetylene will only cut something that can rust) and bind up drill bits? Can't remember where I heard that, could've been in a movie.

Copper can be oxy-welded and braised, so it probably is nonsense. I suppose depending on the size of the copper plate, it may dissipate the heat over its surface fast enough to not allow the point where the torch is to melt. Copper and brass are great insulators to heat.

Be interesting to see what would physically happen though.

[ARF-GEF]

it may dissipate the heat over its surface fast enough to not allow the point where the torch is to melt

That is the theory behind copper sheets. Of course it depends on the time and the kind of torch being used, but afaik it helps.

Off topic:
WOW this is my one thousandth post here
One can see that I like it here

Yay

[YouLuckyFox]

I'm pretty certain aluminum and copper doesn't cut well (as in barely at all) by an oxy-acetylene torch, but a plasma cutter will make it through without any trouble. I've heard an exothermic torch will go through anything, including concrete. From what I've heard you can place iron over aluminum and cause it to cut through with an oxy-acetylene torch as well, but not without iron placed over it. I definitely don't want to sound like I'm making myself an authority here, I am currently pursuing a 4-year degree in Welding and only know what I remember (that doesn't make me an authority either!) but I did talk with my Welding professor and this is what he told me. I'm by no means some Baal Shem Tov of joining and cutting processes . If anyone has heard differently, please share!

[GWiens2001]

Know that aluminum clogs up the grinders at work when the other mechanics try grinding it, then it is a pain getting the aluminum out of the stone.

Possibly carbide bits imbedded in aluminum, so the carbide dulls the drill bits/cutting wheels, and the aluminum then clogs it up?

Gordon

[YouLuckyFox]

Update on this, as some of my previous comments were not entirely true (though I though so at the time ):
The limitations to Oxy-Fuel Cutting are as follows:
-the melting point of the metal you are cutting must be higher than the kindling point
-the oxide that is created when the metal is exposed to oxygen in the air must melt at a lower temperature than the metal itself (ex: aluminum melts at 1250F, while Aluminum oxide melts at 3760F; Ferrous Steel melts at 2500F and Iron Oxide melts at 2500F)
-Thermal conductivity of the metal must be low enough so that the kindling temperature can be reached and maintained (ex: copper)
-Oxides formed must be fluid when molten
Examples of metals that could be cut are ferrous steel, titanium, magnesium.
Examples of metals that could not be cut are copper, aluminum, and brass.

From what I have learned there is a way to force a severance on a material like aluminum, by sandwiching it between two layers of ferrous steel, but it is unreliable. (I saw a video of it , but can't find it anymore. Let me know if you do.) Also, I can't find my source on copper being used to bind up drill bits, though I remember it was on TV or a movie. Either way, I have debunked this somewhat, in that the copper layer would need to be thick enough to bind the flutes on the drill and prevent chip from being cleared. There may be some merit to a layer of copper used to cause a drill bit to break against the next layer of steel due to the sudden release in needed pressure. In other words, you are using a rig to apply a large amount of force to drill through hardened steel, then you hit a soft layer of copper or aluminum and it punches through immediately and hits another wall of hardened steel and breaks the drill bit. Though it was not on a safe, I have experienced this first hand.

Please let me know if you have any questions, guys. I learn as you do.

[serrurier]

What you attach too is paramount. I remember seeing a top of the line lock attached to a soft metal loop that you could have bitten through with your teeth

As stated the goal is not to resist a grinder but to attract attention and perhaps make it harder to get to the price which will make the thieves go to a softer target.

[KPick]

What you attach too is paramount. I remember seeing a top of the line lock attached to a soft metal loop that you could have bitten through with your teeth

As stated the goal is not to resist a grinder but to attract attention and perhaps make it harder to get to the price which will make the thieves go to a softer target.

I've done that once and to my surprise the dentist told me it'll cost me about 500 dollars to replace that tooth. Ever sinc that day, I've squirted milk out of my mouth at five a squirt as a means of gathering the funds for the tooth, but then I ended up buying a beer and bought myself this here gold tooth instead

[Barthel]

If you get someone willing to use a large Petrol driven Ankle grinder or hydraulic cutting pliers like firemen are using to get people out of crashed cars or using oxy-acetylene cutters nothing will stop them to simply break the weakest part

... even if you have a door withstanding that, the wall or window next to the door will not...

same with the bikes... these aluminum frame bikes: the guys simply use a pipe cutter (the small ones you use to cut heating pipes e.g.) which is easy to conceal, silent to operate, 2-3 rotations and the frame is cut, get the bike home, sell the wheels/shift/breaks in pieces...

[YouLuckyFox]

Remembered the movie that talked about copper binding up drill bits: Michael Mann's "Thief."
http://www.script-o-rama.com/movie_scripts/t/thief-script-transcript-james-caan.html

[Squelchtone]

Remembered the movie that talked about copper binding up drill bits: Michael Mann's "Thief."
http://www.script-o-rama.com/movie_scripts/t/thief-script-transcript-james-caan.html

That's a good movie:

[BM-Locksmith]

Seems like there are some knowledgable locksmiths here. thanks for the good read

[ARF-GEF]

Wow that is a surprisingly good portrayal of actual safe opening Squelch, thanks
Not too common in films. When they showed the lock in the inside I was hoping it will be a boroscope manipulation :/
Is that a safe before relockers became common or is that just cause it's a film?
Or were there at all relocker less locks common at all?

Sorry, if I'm veering towards advanced just ignore and delete