Thought it was bent, but was the grind

[Dusty Cliff]

Hey all,

When I first seen the blade on my police I thought it was bent, but on closer inspection it would appear to be an uneven grind. I have never had this before on my spyderco knives. Dose anyone have anything like this? Would appear that most of the grind is on the one side and the other is for the most part strate.

No I don't want to return it. It works fine and cuts like a Lazer. It in no way interferes with this intended purpose.

Regards,
Dusty

[Airlsee]

I have a GB1 that has two totally different swedge grinds, which makes the blade appear off center, but no FFG's.

Yours isn't the only time I've seen the primary bevels or distal taper asymmetrical, but may be one of the most severe examples I've seen, if that's what the picture is indeed depicting.

[samdasnake]

I have a Centofante 3 that I thought was bent but it turned out just to be the grind. Only time I've seen that in person

[Accutron]

That looks like warping during heat treatment.

[dsvirsky]

I have a Wegner Jr. where the hollow grind is way off on one side. No effect on function, so I used a coarse diamond hone to take some metal off the "fat" side, towards the tip, allowing the spine to appear straight, when viewed from above

[Dusty Cliff]

Deleted

[Dusty Cliff]

That looks like warping during heat treatment.

Maybe. It's hard to get a good photo to show more. It's only a millimeter or two of, but the long blade shows towards the end. On the one side it's dead flat against a ruler, however on the last 3/4 of an inch of distal taper on the other side it...

Thanks,
Dusty

[Doc Dan]

I don't know. I think I'd send that back to wherever I bought it and get a replacement....but that's me.

[Pokey]

This is a factory second Maxamet PM 2. It’s not bent, the right side is pretty much straight instead of having a taper towards the blade center line. All of the taper is on the left side. The tip just misses the handle and it doesn’t affect the use at all.

[Dusty Cliff]

This is a factory second Maxamet PM 2. It’s not bent, the right side is pretty much straight instead of having a taper towards the blade center line. All of the taper is on the left side. The tip just misses the handle and it doesn’t affect the use at all.

Hey Pokey,

Thanks for your photo. That looks almost 100% the same as mine in k390. It was not a factory second, but an interesting grind. It's a good cuter and a tool so I'm not sending it anyplace. You can't see it, but if I slide my fingers down the blade I can feel high and low spots on the grind. Maybe it was a Friday afternoon job. Lol

Was your knife a second due to the grind or something else?

Thanks again,

Dusty

[donutsrule]

It's a rare chisel grind for precise food prep. :)

[Pokey]

This is a factory second Maxamet PM 2. It’s not bent, the right side is pretty much straight instead of having a taper towards the blade center line. All of the taper is on the left side. The tip just misses the handle and it doesn’t affect the use at all.

Hey Pokey,

Thanks for your photo. That looks almost 100% the same as mine in k390. It was not a factory second, but an interesting grind. It's a good cuter and a tool so I'm not sending it anyplace. You can't see it, but if I slide my fingers down the blade I can feel high and low spots on the grind. Maybe it was a Friday afternoon job. Lol

Was your knife a second due to the grind or something else?

Thanks again,

Dusty

Dusty,

I think mine is a second due to what I've read from heat treating issues on Maxamet.

I've read here on the forum that Spyderco had/has a heck of a time with the heat treat on the blades. There are a high number of blades that don't pass their QA inspections and aren't sold on first quality knives. I just did a quick search on the web and it looks like only one other company sold Maxamet bladed knives; and they quit after only making 250 of them. It looks like Spyderco is the only maker that's hanging in there and working with Maxamet now.

On mine it isn't really the grind; all the dimensions are identical on both sides, and the surface finish is the same. I believe it's from the heat treatment. It appears that the blade just laid down flat on whatever surface they're treated on. I think they're ground/machined/lased to to proper shape first, they get heat treated, then the final grind is done on the edge. (Disclaimer: There's a good chance I don't know how Spyderco makes their blades, and I'm full of baloney! I have seen some videos on YouTube, though.)

[Dusty Cliff]

This is a factory second Maxamet PM 2. It’s not bent, the right side is pretty much straight instead of having a taper towards the blade center line. All of the taper is on the left side. The tip just misses the handle and it doesn’t affect the use at all.

Hey Pokey,

Thanks for your photo. That looks almost 100% the same as mine in k390. It was not a factory second, but an interesting grind. It's a good cuter and a tool so I'm not sending it anyplace. You can't see it, but if I slide my fingers down the blade I can feel high and low spots on the grind. Maybe it was a Friday afternoon job. Lol

Was your knife a second due to the grind or something else?

Thanks again,

Dusty

Dusty,

I think mine is a second due to what I've read from heat treating issues on Maxamet.

I've read here on the forum that Spyderco had/has a heck of a time with the heat treat on the blades. There are a high number of blades that don't pass their QA inspections and aren't sold on first quality knives. I just did a quick search on the web and it looks like only one other company sold Maxamet bladed knives; and they quit after only making 250 of them. It looks like Spyderco is the only maker that's hanging in there and working with Maxamet now.

On mine it isn't really the grind; all the dimensions are identical on both sides, and the surface finish is the same. I believe it's from the heat treatment. It appears that the blade just laid down flat on whatever surface they're treated on. I think they're ground/machined/lased to to proper shape first, they get heat treated, then the final grind is done on the edge. (Disclaimer: There's a good chance I don't know how Spyderco makes their blades, and I'm full of baloney! I have seen some videos on YouTube, though.)

Thanks Pokey,

I'm always amazed how much I learn from this forum as what you have explained makes sence. One side is dead flat and the taper is all seen on the other side, yet the shape looks good. Maybe it is the sagging during heat treatment. I also read on another forum post that the Japanese like this asymmetrical shape. I don't know if that is true. Would explaine a lot.

http://japaneseknifesharpening.blogspot ... l.html?m=1

I wonder if this is seen more with tool steel as my stainless blades are perfect.

Thanks,

Dusty

[Josh Crutchley]

I got a PM2 Maxamet from the seconds sale that looked like that. Surprised yours didn't get picked up by QC.

[Dusty Cliff]

I got a PM2 Maxamet from the seconds sale that looked like that. Surprised yours didn't get picked up by QC.

Hey Josh,

Thanks for sharing.

I got mine online from the other side of Canada. By the time I noticed it, I had already forced a patina and sharpened it. So it can't go back. I did contact spyderco and they said to send it in. I thought about it, but shipping there and back and the risk with customs for a blade that is still 100% functional seems pointless. It looks okay.

And having learned so much from the forum about it makes me feel about even. Live and learn I think. And if I don't tell anyone, I'm the only one who knows.

Thanks,
Dusty

[remnar]

Here's a photo of a worker that I received with an uneven grind. I sent it in to Spyderco and they did take care of me but it probably would have been a lot easier to just send it back to Knifeworks and get a replacement.

[Josh Crutchley]

Hey Josh,

Thanks for sharing.

I got mine online from the other side of Canada. By the time I noticed it, I had already forced a patina and sharpened it. So it can't go back. I did contact spyderco and they said to send it in. I thought about it, but shipping there and back and the risk with customs for a blade that is still 100% functional seems pointless. It looks okay.

And having learned so much from the forum about it makes me feel about even. Live and learn I think. And if I don't tell anyone, I'm the only one who knows.

Thanks,
Dusty

If it works for you then I wouldn't worry about it. I've seen Maxamet blades worse than mine that weren't seconds, so I was more than happy when it showed up in that condition.

[metaphoricalsimile]

I have a 20cv Para 3 LW with a similar issue, although not as pronounced.

[Dusty Cliff]

I have a 20cv Para 3 LW with a similar issue, although not as pronounced.

Thanks for the information. I thought it was a seki city thing and with steel, not stainless.
All of my golden USA knives are 100%. My para 3 s110v is an amazing knife.

Thanks again,

Dusty

[metaphoricalsimile]

I have a 20cv Para 3 LW with a similar issue, although not as pronounced.

Thanks for the information. I thought it was a seki city thing and with steel, not stainless.
All of my golden USA knives are 100%. My para 3 s110v is an amazing knife.

Thanks again,

Dusty

What I'm *guessing* is that this is more frequent in knives with more expensive steels, because the window of acceptable warping to QC might be wider due to the larger impact to the bottom line on rejected blades. My Para 3 is still an amazing knife, it just has a slightly asymmetric blade. It still cuts and handles just like a para 3 with a perfect blade.