What is the point of this notch?

[jalcon]

What is the purpose of this cutout in the PM2 tang? Where the red arrow is....(this is not my knife btw)



Because mine looks like this and isn't a nice straight clean edge. Will this effect anything?



Right now it doesn't seem like it does. Just making sure. Yes this goes along with another thread I had.

Thanks!

[Evil D]

I'm thinking that's the ramp for the detent ball?

[jalcon]

I'm thinking that's the ramp for the detent ball?

Yeah I have no idea

[zhyla]

I'm thinking that's the ramp for the detent ball?

It’s at the wrong distance from center isn’t it?

Are they cutting these with EDM? It looked to me like maybe a hole for the EDM wire.

[marrenmiller]

Looks like it's a fillet to eliminate the stress concentration that would otherwise be present there.

[Evil D]

I'm thinking that's the ramp for the detent ball?

It’s at the wrong distance from center isn’t it?

Are they cutting these with EDM? It looked to me like maybe a hole for the EDM wire.

Hard to tell, I can't really make out where the detent path is, it looks like it wouldn't be centered with the detent hole and it looks a little small but I'm not sure what else it could be, It could be a random leftover related to laser cutting. I've made similar ramps myself on several compression lock and liner lock knives.

[JD Spydo]

I'm clueless at this point concerning that notch. Because I rarely ever take apart any of my Spyderco blades. However I do like the USA made Spyders that are most easy to take apart if I would ever find a need to do that. I've just had so many Spyderco models over the years and I've been fortunate that I haven't really experienced any significant failures. For instance I've never had any of Spyderco's locking systems ever fail on me. Regardless of which type of locking system it is.

I tend to go with the old philosophy "If It Ain't Broke Then Please Don't Try To Fix It">> that philosophy has worked for me all my life.

[hereiamu1]

If the blade lockup is good I wouldn't mess with it.

[James Y]

I'm no expert, so take this with a grain of salt. Could it possibly be part of the design to absorb or reduce stress along that radius?

Jim

[jalcon]

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If the blade lockup is good I wouldn't mess with it.

Yes I know it's not "normal". I made a thread on this a few days ago...just trying to figure out what the notch is for...

I'm no expert, so take this with a grain of salt. Could it possibly be part of the design to absorb or reduce stress along that radius?

Jim

Could be. Maybe Sal could chime in?

[Guts]

Took a look at a few of my compression lock models (PM2, Para3, Yojimbo2, and Lil Native) and they all have that relief cut. I agree with others that it's likely for stress relief as the flat surface above that cutout is one half of where the compression lock is compressed between. The other half being the stop pin.

[RustyIron]

I suspect the flat surface is finished separately, toward the end of assembly, to create a perfect lockup. Reliving the area behind the lock surface allows easier final finishing.

[shunsui]

Are they cutting these with EDM? It looked to me like maybe a hole for the EDM wire.

I recall a similar question years ago and it was the starting point for the cutter. I'd guess that's what it is.

[Dodge]

I believe it’s a channel for debris to accumulate instead of effecting the lockup. It’s not a defect, all 4 of my paramilitaries have this.

[Wandering_About]

It's a channel for collecting the power from dark matter to increase edge retention.

[jalcon]

I believe it’s a channel for debris to accumulate instead of effecting the lockup. It’s not a defect, all 4 of my paramilitaries have this.

Of course they all have it haha, I'm questioning mine...which looks nothing like other PM2s, the bottom is real rough looking. Was wondering it mattered, that's all.

[Dodge]

I believe it’s a channel for debris to accumulate instead of effecting the lockup. It’s not a defect, all 4 of my paramilitaries have this.

Of course they all have it haha, I'm questioning mine...which looks nothing like other PM2s, the bottom is real rough looking. Was wondering it mattered, that's all.

Technically speaking yours has more mass and is structurally more sound!! It it bothers you I’m sure you could take a razor blade and knock off the burr.