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Failed to open old SG lock

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femurat

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Post Tue Nov 09, 2021 9:46 am

Failed to open old SG lock

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I was called to open an old vault door and failed. It was the first time I left a job after a day of work, without opening it. You can imagine I'm very sad about it.
Everything was going fine but I missed something.
At some time during the manipulation process I tried to move the knob and left it in the unlock direction, making the bolt work push against the lock bolt. This may be a newbie mistake that made some of my graphs flat. And many high-low tests were unhelpful. But I suspect there's something else that I missed.
Here are the 9 graphs I made. Any suggestion is appreciated.

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I have another chance to go there soon for a couple hours before the door gets drilled. The first thing I'm going to do is to use odd numbers instead of evens. Usually it doesn't make a difference, but this time it could.

Any idea of the lock model, based on the dial? Is it normal that the plastic brand is optical white while the dial paint is a bit yellow? Or maybe it was replaced for some reason?

Thanks :)
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bitbuster

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Post Tue Nov 09, 2021 5:05 pm

Re: Failed to open old SG lock

Possibly a square spindled 6705 ???
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Alexander Mundy

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Post Wed Nov 10, 2021 12:16 pm

Re: Failed to open old SG lock

In graph 5 that area around 42 screams gate signature to me. I would start by re-evaluating that area and see if I miss identified which wheel. Perhaps L10-R42-AL as a starting point? If not I'd re-evaluate L10.
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Alexander Mundy

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Post Wed Nov 10, 2021 12:31 pm

Re: Failed to open old SG lock

Also, I assume at the start you dialed to be sure it wasn't for some reason a 4 wheel?
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femurat

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Post Fri Nov 12, 2021 2:23 pm

Re: Failed to open old SG lock

Thank you bitbuster. I thought it could have been a 6725 because I have one with a similar dial, but you're the guessing expert here!
Anything strange about the 6705? I mean, it should have no tricks to it, just a plain and simple S&G lock...

Alexander, thank you for pointing that out. I always start by counting the wheels, even before locating contact points.
I agree about 42 looking like a gate. I'll further look into it...

Cheers :)
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MartinHewitt

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Post Fri Nov 12, 2021 9:53 pm

Re: Failed to open old SG lock

I think this is just a normal modern dial. The yellowed white is sunk into surface and so can grab a lot of dirt. The whitish white is just flat. You can see the dial here: https://1010security.com/sg-dial-1.html The dial for the 6705 is of an older style. I think this safe has a 6700 series lock. My guess is a 6730, because the small part of the safe that I can see does not look that new and I think the 6730 was then most common.

Is it a Mauer key lock?
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femurat

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Post Mon Nov 15, 2021 11:31 am

Re: Failed to open old SG lock

The key had only some numbers engraved on one side of the bow, nothing on the other side. So I'm not sure about the brand.
The house and vault door look quite old, 50 years maybe. I'm not sure about it though.

Following another thread, I ordered a simple audio amplifier. Let's see if it makes a difference.

Cheers :)
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MartinHewitt

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Post Mon Nov 15, 2021 1:02 pm

Re: Failed to open old SG lock

The force is strong in you!
In case you wonder ... Martin Hewitt is a fictional detective in stories by Arthur Morrison:
Martin Hewitt, Investigator Chronicles of Martin Hewitt

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