Is it time to CQI the PM2?

sharp_edge said:
Please elaborate on "superior" in what sense? That compression lock notch will create a hot spot for extended cutting whereas with the liner lock you can cut all day long without any hot spot. I do think the compression lock is stronger than the liner lock though it is debatable whether the increased strength is necessary for a folding knife.
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I realize I shouldn’t have said objectively since all the differences are evaluated differently by different persons. So I’ll just list the differences I know of.
  1. Strength. Compression lock is stronger.
  2. Cost. Equal.
  3. Reliability and longevity. Equal.
  4. Keep fingers out of closure path. Comp lock is better.
  5. Strong grip when closing. Liner lock is better.
  6. Speed of closing. Comp lock is better.
  7. Handle smoothness. Liner lock is better but the difference is small.
 
CQI = Constant Quality Improvement. CQI

So by definition the PM2 is subject to constant change. The Copper handled Blade HQ model would be a good real world smapshot of current pattern.

Some of this sounds a lot more like wanting a whole new model of knife instead of a improved PM2.
 
Danke42 said:
CQI = Constant Quality Improvement. CQI

So by definition the PM2 is subject to constant change.

Some of this sounds a lot more like wanting a whole new model of knife instead of a improved PM2.
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Agreed. There is probably a reason why there isn’t a CQI version of the PM2.
 
I prefer the screw stop-pin to the floating stop-pin. If you swap the original scales to some customer scales, depends on the material and accuracy of the scales, there might be some deviation in tolerance. The screw stop pin will be helpful under this kind of situation.
 
I believe there were some changes made when they 52100 models came out a few years ago; hopefully someone else knows what they were exactly since I can’t remember.
 
Danke42 said:
CQI = Constant Quality Improvement. CQI

So by definition the PM2 is subject to constant change. The Copper handled Blade HQ model would be a good real world smapshot of current pattern.

Some of this sounds a lot more like wanting a whole new model of knife instead of a improved PM2.
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Thank you. I was just going to ask what CQI meant.
 
According to the new Byte today, the PM2 was the CQI version of the original Paramilitary. I’m not sure what more they could change on the PM2.
 
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I just got a K390 in, second hand, and thought it needed a fresh edge. Which leads me to another CQI recommendation - about a 1/8" sharpening choil.

This one already has from the factory hint of recurve going. To fix it means the the little drop piece on the front of the finger choil at the plunge line is going to ride the side of the stone.
 
No factory sharpening choil/notch, please.

I sharpen mine all the way to the plunge, so that there isn’t a notch to snag on things I’m cutting. Therefore, no choil is needed or wanted. If someone wants one, that person should create one.

If there is a hint of recurve from the factory, perhaps the factory could be more careful in their sharpening.
 
Mark Spark said:
...But it’s less strong than the screwed blade stop.
I trust Spyderco’s choice of which design to use in which knife...
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I don’t think the floating pin would be less strong than a screwed construction. Screws are pretty weak in shear compared to pins. Yes the standoffs in the current pm2 are stepped, but most of the step is a threaded hole. I think that the floating pin would likely be stronger than the screwed standoffs.
 
M. Johnwell said:
I don’t think the floating pin would be less strong than a screwed construction. Screws are pretty weak in shear compared to pins. Yes the standoffs in the current pm2 are stepped, but most of the step is a threaded hole. I think that the floating pin would likely be stronger than the screwed standoffs.
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The floating pin may well be stronger in shear, which would make it stronger in holding the blade locked, depending on the design details of the screwed version. But the screwed stop pin reinforces the knife against blade sideways forces also. In totality it’s stronger.
 
since the pm2 was an improvement on the pm which was a great knife as well, I dont see much room needed for improvement. that change was in the mid 2010s era I seem to remember. the lanyard tube is something id like to see go away.
 
Mark Spark said:
The floating pin may well be stronger in shear, which would make it stronger in holding the blade locked, depending on the design details of the screwed version. But the screwed stop pin reinforces the knife against blade sideways forces also. In totality it’s stronger.
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Floating stop pin would actually be stronger. The screw is a weak point especially when the stop pin is main load component for the lock.

Look at the Ultimate Hunter vs Manix 2 video below, you can see that Manix 2 failed because the front screw that hold the top part of the ball bearing lock sheared off. The lock itself didn't fail, the structure failed. I suspect if Spyderco change the front screw into a one-piece floating pin that goes through both the liner and the scale, it would've held much more weight. I'm using Manix 2 as an example because the video demonstrated the failure due to the screw.

The other advantage of floating stop pin is that you don't have to worry about screws coming loose. I have had 7 PM2 over the last few years, at least 4 of them has stop pin screw that's always coming loose on one side, probably due to the impact of the blade hitting the stop pin knocking it loose. The only way to hold them in place is to locktite it.

If we are talking about stop pin screws helping with sideway/lateral force though, the entire blade would probably break off first before the screws get shear off. The knife handle is subjected to more compressive force, i.e. the handles being pressed together hard, this is why you have stop pin/standoff/backspacers. I can't imagine a knife being subjected to force that would split the handle apart.

 
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insta9ves said:
I can't imagine a knife being subjected to force that would split the handle apart.
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I think you lack imagination. I've seen it thousands of times. Every time you pry, even a little, the tang of the blade is trying to force the handle apart. Every time you twist the blade, even a little, in a cut, the tang is trying to force the handle apart. Every time you put lateral load on the blade by shaving a curl of wood from the side of a stick, the tang of the blade is trying to force the handle apart. Say what you like about a floating stop pin, the fact is it does nothing to counter those forces. A screwed stop pin does.
 
yablanowitz said:
I think you lack imagination. I've seen it thousands of times. Every time you pry, even a little, the tang of the blade is trying to force the handle apart. Every time you twist the blade, even a little, in a cut, the tang is trying to force the handle apart. Every time you put lateral load on the blade by shaving a curl of wood from the side of a stick, the tang of the blade is trying to force the handle apart. Say what you like about a floating stop pin, the fact is it does nothing to counter those forces. A screwed stop pin does.
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That’s what the pivot screw is for. No need to get so emotionally attached to those stop pin screws :D
Floating stop pin works for military and para3, im sure it’ll work well for pm2.
 
Trust me, there is no part of the PM2 that I'm attached to, emotionally or otherwise.
 
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