Let’s talk lock rock and is this it?

I thought lock rock can be better tested by pushing down on the blade on a hard surface see if theres any movement, or hold the blade and handles try to move the blade .
 
goldie said:
I thought lock rock can be better tested by pushing down on the blade on a hard surface see if theres any movement, or hold the blade and handles try to move the blade .
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Bro that’s exactly what is done in the two videos lol
 
Went through some of my knives to check for this.
Shirogorov, no rock.
Spyderco PM2, no rock.
Kershaw, no rock
Sebenza small 21, no rock.
Vosteed Psyop, rocks considerably. Wondering if it's the type of lock...
 
I believe "lock slip" and "lock rock" are different issues but can both happen at once for the same or different reasons. It seems like the angle of the blade tang and lock bar is involved in both of these issues in addition to lock bar flex and not enough tension on the lock bar.
 
91bravo said:
Spyderco back lock knives inherently do this too. The blade rocks up and down when the knife is open. I don’t find find this to be a safety issue, but just a nuance of the back lock design. I never notice it in use…
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Spyderco says some rocking is “normal” but I have 5-10 Spyderco back lock knives and none have any rocking when locked. I have too many lock backs 🙂 and only a ~40 yo Puma has developed it, but it’s not a safety issue.
 
brownshoe said:
Spyderco says some rocking is “normal” but I have 5-10 Spyderco back lock knives and none have any rocking when locked. I have too many lock backs 🙂 and only a ~40 yo Puma has developed it, but it’s not a safety issue.
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I can force up and down play on all of my Spyderco back locks. It’s not really a safety concern to me because although they have the up/down play, I’ve never had one close on me.
 
It's inherent to their lock design. Keeping the explanation simple, the lock bar can flex a bit because of the design of the lock bar and the lock geometry. It's not necessarily unsafe unless the lock contact surfaces themselves are slipping. I wouldn't call this "lock rock", as that is commonly used to describe a slipping lock surface, but there's no formal definition for it that I'm aware of. "Lock bar flex" might be a more accurate way to describe it.

All three of the Tri-Way Hinderers I've owned exhibited this lock movement. I sent one of them back to Hinderer and asked them to fix it, and they sent it back saying they found no defect.

Edit: I forgot I filmed a video of one of my brand new Hinderers doing this:
 
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marrenmiller said:
It's inherent to their lock design. Keeping the explanation simple, the lock bar can flex a bit because of the design of the lock bar and the lock geometry. It's not necessarily unsafe unless the lock contact surfaces themselves are slipping. I wouldn't call this "lock rock", as that is commonly used to describe a slipping lock surface, but there's no formal definition for it that I'm aware of. "Lock bar flex" might be a more accurate way to describe it.

All three of the Tri-Way Hinderers I've owned exhibited this lock movement. I sent one of them back to Hinderer and asked them to fix it, and they sent it back saying they found no defect.

Edit: I forgot I filmed a video of one of my brand new Hinderers doing this:
Click to expand...


Yeah I rally think i could take 95% of frame locks and do this tbh...guessbits not an issue
 
Why is there a table involved in this test?

Lock rock is felt, generally, just by shaking the knife when open. IMO.
 
I just checked my Hinderer and I can get the lock to flex if I pin it down on a table like the video, but I can’t get it to make any of the clicking noises from squeezing or wiggling the blade firmly up and down.
 
I have an XM-24, an XM-18 3.0 and an XM-18 3.5 and none of them have this issue. They are as solid as any other folders I have; and I have a lot of them.
 
brownshoe said:
Spyderco says some rocking is “normal” but I have 5-10 Spyderco back lock knives and none have any rocking when locked. I have too many lock backs 🙂 and only a ~40 yo Puma has developed it, but it’s not a safety issue.
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I guarantee we could, everyone’s opinion here is subjective of how they are testing it.
 
I’m
vjb.knife said:
I have an XM-24, an XM-18 3.0 and an XM-18 3.5 and none of them have this issue. They are as solid as any other folders I have; and I have a lot of them.
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It’s all perception, I guarantee those who say theirs have it would feel it in yours.

Not as bad as a sebenza 31..but its there
 
marrenmiller said:
It's inherent to their lock design. Keeping the explanation simple, the lock bar can flex a bit because of the design of the lock bar and the lock geometry. It's not necessarily unsafe unless the lock contact surfaces themselves are slipping. I wouldn't call this "lock rock", as that is commonly used to describe a slipping lock surface, but there's no formal definition for it that I'm aware of. "Lock bar flex" might be a more accurate way to describe it.

All three of the Tri-Way Hinderers I've owned exhibited this lock movement. I sent one of them back to Hinderer and asked them to fix it, and they sent it back saying they found no defect.

Edit: I forgot I filmed a video of one of my brand new Hinderers doing this:
Click to expand...
Unless the pivot was loose, I bet if you opened it harder and/or gave it time to break in it would go away.
 
Lockbar flex. To what degree will vary based on the thickness of the lockbar and geometry of its engagement with the tang, but any framelock knife will eventually flex if enough pressure is applied to the spine. Fortunately, when using a knife as a cutting tool, pressure is applied at the blade's sharpened edge, so.. non-issue.
 
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