Pivot lash

[XtianAus]

I have not heard much if anything about it. I didn't even know it was a thing until it was pointed out to me.
I have since experienced it on a few knives, including a high end piece.

Is it normal?
Does it have any functional draw-backs?
What are your thoughts on it?

 

[Danke42]

Pivot lash is my most treacherous foe. I would like to eat it's children.

 

[Squidman24]

Although I’d prefer not to have either, if I had to pick one, I’ll take pivot lash over lock stick any day. Lock stick is like nails on a chalkboard to me.

 

[killgar]

What the heck is "pivot lash"?

 

[ferider]

What the heck is "pivot lash"?

Pivot lash is when the pivot hole in the blade is larger than the pivot barrel. When the blade is between open and close, you can move it.

 

[Glenn Goodlett]

What the heck is "pivot lash"?

 

[killgar]

Pivot lash is when the pivot hole in the blade is larger than the pivot barrel. When the blade is between open and close, you can move it.

Ok. Thanks. I've been on this forum for over 20 years and I've never seen that term before.

I would just call that a poorly fitted pivot, or "slack", or "play". I didn't know it had a name. I can't help but wonder if it's a term started by some youtuber.

I'm going to stick with my terminology. "Pivot lash" just sounds to hip/youtubey for me.

EDIT: Out of curiosity I just did a full forum search for the term "pivot lash". The first (oldest) result I saw for it is January, 2020. I guess I didn't read those threads.

 

[Sharp & Fiery]

This looks more like when the detent hole is too big for the detent ball.

ferider
If pivot lash is when the pivot hole is too big for the pivot barrel causing movement between opened and closed…then almost all CRK’s exhibit this.
Am I seeing this correctly in my head?

 

[Glenn Goodlett]

I'm just guessing at what the OP was calling Pivot lash. I'd probably call it detent slop or loose detent. In my video the blade would rattle if you shook the knife in the closed position. That knife is back at the maker now. I think a larger stop pin and maybe an adjusted (ground) lock insert would fix the issue. I'll see what the experts say.

 

[Alberta Ed]

I thought pivot lash had something to do with flogging.

 

[steelcity77]

Ok. Thanks. I've been on this forum for over 20 years and I've never seen that term before.

I would just call that a poorly fitted pivot, or "slack", or "play". I didn't know it had a name. I can't help but wonder if it's a term started by some youtuber.

I'm going to stick with my terminology. "Pivot lash" just sounds to hip/youtubey for me.

EDIT: Out of curiosity I just did a full forum search for the term "pivot lash". The first (oldest) result I saw for it is January, 2020. I guess I didn't read those threads.

Idk how to send a DM. I wanted to ask you about your custom Ti-lite blades

 

[AntDog]

One more thing to fret over and obsess about? Pivot lash. Pbsheeeeit.

 

[ricklikesknives]

As long as a knife locks up solid during use & stays closed otherwise, I don't put much energy into worrying about a bit of barely perceptible play in between.. as a rule, if I have to go looking for it, it's not a problem.

 

[Greggy]

It is time to create the after market pivot replacement industry. $$$

 

[luethge]

Fixed blades solve the “pivot lash” problem



Zero pivot lash, play or lock stick

 

[NG VI]

Pivot lash is when the pivot hole in the blade is larger than the pivot barrel. When the blade is between open and close, you can move it.

oh that's called 'detent lash' and yes it's horrible, definitely something to address and either decide to keep it as a disfavored specimen if it's good enough or a good enough deal otherwise, or send it back, or pass it along to someone who doesn't mind it.

 

[Sharp & Fiery]

oh that's called 'detent lash' and yes it's horrible, definitely something to address and either decide to keep it as a disfavored specimen if it's good enough or a good enough deal otherwise, or send it back, or pass it along to someone who doesn't mind it.

Actually detent lash/play is when the detent hole is bigger than the detent ball.

I think that maybe you just got the quote mixed up?

 

[AntDog]

Fixed blades solve the “pivot lash” problem

View attachment 2217878

Zero pivot lash, play or lock stick

I’ve been saying for years “if it ain’t fixed, what is it?…”

 

[farid.]

Pivot lash or pivot play how ever you wish to put it is when the pivot hole in the blade or the pivot barrel is not high precision and there is an unacceptable 'gap' in there between the two parts, 'D' tent play is another thing entirely, when you are in the final stage of assembly and machining of the 'D' tent with a carbide spade drill, when you center punch the 'D' tent with a solid carbide center punch, 'if' you center punch just a few thou out of place and you go ahead and drill the 'D' tent that blade becomes totally 'scrap' because you can not fix this issue, it is one of the most sensitive operations on building folders, you can not sell that knife with 'D' tent play.

 

[sharp_edge]

Wait...I think we are mixing two different things: pivot lash vs detent rock/play. Pivot lash is like what ferider explained while detent rock is what the hinderer Project X shows in that video.

Edit: the above two folks beat me to it.