How much force to bend Southord Lockpick

[Vargh]

Hi guys.

Does anyone know the difference in force needed to bend the high yield southord lockpicks vs the normal slimline ones?

I did some bending stress calculations and by the material properties they gave me on their website it seems like it would only take 0.16 lb of force acting at 2 inches from the tip of the pick to bend it. I doubt I did this right because my windshield wiper picks can stand up to a lot more force.

Is this true because that would mean bending picks is super easy?

Thanks.

Specs:
Yield stress 185000 psi
Base of pick 0.022 inches
Assumed height of pick 0.022 inches
Assumed distance to tip of pick that I would apply force 2 inches

[jimu57]

Need to determine moment of inertia at cross section of weakest point. Depending on method of fabricating pick, the process can either embrittle or anneal the material. Also since the bend is cut into the material instead of a forging type process where the grain on the material flows into the shape, you may have stress concentration at the curved section.

I find that Southord picks bend and Petersons breaks. Usually.

[Jacob Morgan]

Need to determine moment of inertia at cross section of weakest point. Depending on method of fabricating pick, the process can either embrittle or anneal the material. Also since the bend is cut into the material instead of a forging type process where the grain on the material flows into the shape, you may have stress concentration at the curved section...

Would you treat it like a cantilever beam with a concentrated load on the end and calculate the deflection? Assuming that any perceptible deflection would be bad for picking.

Then again, do picks bend from lifting pins, or from levering picks such that the bottom of the key way is a fulcrum while the end of the pick is up against something immovable?

[Vargh]

Need to determine moment of inertia at cross section of weakest point. Depending on method of fabricating pick, the process can either embrittle or anneal the material. Also since the bend is cut into the material instead of a forging type process where the grain on the material flows into the shape, you may have stress concentration at the curved section.

I find that Southord picks bend and Petersons breaks. Usually.

Yeah. I tried to do that where the moment of inertia is calculated assuming a rectangular cross section (I = 1/12 * b * h^3). I calculated the force from the equation: sigma = F*d*h / (2*I) where d is the distance from the force to the tip of the pick. I assumed between 1 and 2 inches for d.

Thanks for the info about Southord picks vs Petersons. Two questions though.

1. When you say that Southords bend, do you mean that they bend in the elastic region i.e. they bend back after unloaded?

2. Do you remember approximately how much force it takes to bend a Southord slimline pick? I mean is it like the force of holding up a pencil or the force of holding up a smartphone? Any ballpark estimate would be great. I'm just a bit worried that they bend like some of the less than a 0.3 mm stock steel sheet I have.

Thanks again!

[Squelchtone]

dude, you are wayyyy overthinking this.. when I see math formulas being busted out to determine the bendability of a pick... yikes..

have you purchased a set yet from the other threads where everyone gave you advice? You seem to be dwelling really hard on dropping $30 bucks just to see for yourself that they're well made and will open locks.

If you're bending picks during picking, you're doing it wrong.


Squelchtone

[tpark]

The slimlines are good if you don't lean too hard on the picks, max yield can be leaned on but is too thick to fit in some keyways. Watching youtube videos may give you a hint as to what other people use. The only real way to know if certain picks will work is to try them - then you can wonder if that 15 thou Peterson Gem is better, or if this or that 15 dollar "Government Steel" pick will magically make it easier to open locks, and pretty soon you have many cases of picks

[jimu57]

I think in the elastic region there is very little room before it reaches plastic. In tension it may be different but in bending across the small cross section I feel the steelnis too "soft". Peterson feels better and I think Sparrows even better.

[jimu57]

dude, you are wayyyy overthinking this.. when I see math formulas being busted out to determine the bendability of a pick... yikes..

have you purchased a set yet from the other threads where everyone gave you advice? You seem to be dwelling really hard on dropping $30 bucks just to see for yourself that they're well made and will open locks.

If you're bending picks during picking, you're doing it wrong.


Squelchtone

We gotta toss around a little BS occasionally. I test all my picks with the Hewlett Packard digital oscillating grammeter. The sinusoidal flux readings in Southord is below ASTM specs.

Jim

[Squelchtone]

dude, you are wayyyy overthinking this.. when I see math formulas being busted out to determine the bendability of a pick... yikes..

have you purchased a set yet from the other threads where everyone gave you advice? You seem to be dwelling really hard on dropping $30 bucks just to see for yourself that they're well made and will open locks.

If you're bending picks during picking, you're doing it wrong.


Squelchtone

We gotta toss around a little BS occasionally. I test all my picks with the Hewlett Packard digital oscillating grammeter. The sinusoidal flux readings in Southord is below ASTM specs.

Jim

You're gonna lead me to drink!

[jimu57]

How you think I wrote that crap just now? LOL

[GWiens2001]

Gordon

[Vargh]

dude, you are wayyyy overthinking this.. when I see math formulas being busted out to determine the bendability of a pick... yikes..

have you purchased a set yet from the other threads where everyone gave you advice? You seem to be dwelling really hard on dropping $30 bucks just to see for yourself that they're well made and will open locks.

If you're bending picks during picking, you're doing it wrong.


Squelchtone

We gotta toss around a little BS occasionally. I test all my picks with the Hewlett Packard digital oscillating grammeter. The sinusoidal flux readings in Southord is below ASTM specs.

Jim

Lol. Great joke!

[jeffmoss26]

dude, you are wayyyy overthinking this.. when I see math formulas being busted out to determine the bendability of a pick... yikes..

have you purchased a set yet from the other threads where everyone gave you advice? You seem to be dwelling really hard on dropping $30 bucks just to see for yourself that they're well made and will open locks.

If you're bending picks during picking, you're doing it wrong.


Squelchtone

We gotta toss around a little BS occasionally. I test all my picks with the Hewlett Packard digital oscillating grammeter. The sinusoidal flux readings in Southord is below ASTM specs.

Jim

That thing come turbocharged?

[jimu57]

This is the only version that is turbo charged.

https://youtu.be/vHk40VvFsp4

[G-lock]

This is the only version that is turbo charged.

https://youtu.be/vHk40VvFsp4

Wtf? Lmao! I started this video in the middle & watched for about 1minute but could not understand a single word of what hes trying to say.