Behind the edge database!

[elena86]

Great job Fish. I was not expecting Watu to be 0.010 bte. Mine looks more like 0.015.. more or less. Maybe you got a gem. Keep’em coming.

[Evil D]

Great job Fish. I was not expecting Watu to be 0.010 bte. Mine looks more like 0.015.. more or less. Maybe you got a gem. Keep’em coming.

I don't have a Watu but it's kinda hard to believe, just looking at my two regrinds that are both around that thickness BTE, the bevel is so small the blade looks like a zero grind at a glance. It's surprising that Spyderco would grind this one random knife that way.

[elena86]

Great job Fish. I was not expecting Watu to be 0.010 bte. Mine looks more like 0.015.. more or less. Maybe you got a gem. Keep’em coming.

I don't have a Watu but it's kinda hard to believe, just looking at my two regrinds that are both around that thickness BTE, the bevel is so small the blade looks like a zero grind at a glance. It's surprising that Spyderco would grind this one random knife that way.

I asked a friend to come by with his calipers today and we measured all my 3 Watu( Yes, I own three ) ....it’s what I expected, between 0.017 and 0.019 bte.

[jpm2]

I asked a friend to come by with his calipers today and we measured all my 3 Watu( Yes, I own three ) ....it’s what I expected, between 0.017 and 0.019 bte.

Are we comparing apples to apples here?
Can someone explain exactly where to measure bte?

EDIT: nevermind, I see it's already been discussed.
Without edge angle and a couple other variables established it's all apples and oranges.

[Josh Crutchley]

Mule PD#1 .018/.115/.118
Manix 2 LW S110v .019-.021/.118/.125
PM2 Maxamet Second .013-.016/.130/.145
used Manix 2 Cruwear Diamond g10 .025-.027/.119/.125

[elena86]

I feel I should bump this interesting thread. Did anyone measure their Stretch 2 XL in PE ?

[Josh Crutchley]

Anyone ever disagree with your past posts? I sure do! Past Josh must not have been measuring right because there's no way that PM2 Maxamet was ever .013"BTE.

Mule PD#1 .018/.115/.118
Manix 2 LW S110v .019-.021/.118/.125
PM2 Maxamet Second .013-.016/.130/.145
used Manix 2 Cruwear Diamond g10 .025-.027/.119/.125

[Sharp Guy]

Anyone ever disagree with your past posts? I sure do! Past Josh must not have been measuring right because there's no way that PM2 Maxamet was ever .013"BTE.

Mule PD#1 .018/.115/.118
Manix 2 LW S110v .019-.021/.118/.125
PM2 Maxamet Second .013-.016/.130/.145
used Manix 2 Cruwear Diamond g10 .025-.027/.119/.125

Haha, I read your quoted post first and saw the PM2 was .013-.016. I have to admit I was kind of wondering about that one. I've measured enough of these to know that there aren't very many with a low number like that and definitely not PM2. then I read what you said about disagreeing with past posts and had a chuckle

[Josh Crutchley]

Haha, I read your quoted post first and saw the PM2 was .013-.016. I have to admit I was kind of wondering about that one. I've measured enough of these to know that there aren't very many with a low number like that and definitely not PM2. then I read what you said about disagreeing with past posts and had a chuckle

The other ones seem in line with what you would expect. Not sure why the PM2 is so low could have been calipers weren't zeroed, bad measurement, or typo. Don't think it was a typo though as .023"-.026" is a little too thick.

[Sharp Guy]

Don't think it was a typo though as .023"-.026" is a little too thick.

Not necessarily. I just took out 4 PM2s that haven't been reprofiled. One has never been used...

M390 - .019"
REX 45 - .023"
4V - .025"
Cruwear (grey G10) - .024"

The Cruwear measurement is despite what I posted on the first page. I know early on I wasn't using my medical magnifying light to make sure I had the jaws of the calipers right on the shoulder. I believe I was also measuring right below the Spyderco logo. All measurements above were taken right in the middle of the blade. All are accurate because I double and triple checked. My calipers are also periodically checked on a gauge block for accuracy. No squeezing either. If you're using a calipers or mic and you're squeezing the tool you're not measuring correctly

[Josh Crutchley]

The GPK Native 5 in Rex45 I just got came in @ .018" BTE. One of the bevels is ground deeper, here's a pic vs a S35VN N5. The Rex 45 is on the left and you can clearly see a step on one side. Just wish the other side was like that might have been a thou or two thinner.

[Josh Crutchley]

MT38P M398 ~0.018"
MT33P Rex-76 ~0.017"
Enuff 2 VG10 ~0.017"
Dragonfly 2 Superblue/zome ~0.14"

Looks like things are starting to thin out a bit! Is that normal for a Dragonfly?

Edit: I just got a new caliper and measured them again and they where all 1.5-2 thou thicker so I updated the numbers to reflect that. I guess from measuring so many high hrc blades the tips of the calipers got worn.

[wrdwrght]

Would someone who has become systematic/procedural in their BTE measurements, AND has the latest Ayoob and an earlier one, please tell us what you find?

[Evil D]

Would someone who has become systematic/procedural in their BTE measurements, AND has the latest Ayoob and an earlier one, please tell us what you find?

I have both in SE but no PE

[wrdwrght]

Would someone who has become systematic/procedural in their BTE measurements, AND has the latest Ayoob and an earlier one, please tell us what you find?

I have both in SE but no PE

SE to SE would tell me the diff between hollow and saber grinds, which is what has my interest. If you’re inclined, I’d be grateful.

[Evil D]

Would someone who has become systematic/procedural in their BTE measurements, AND has the latest Ayoob and an earlier one, please tell us what you find?

I have both in SE but no PE

SE to SE would tell me the diff between hollow and saber grinds, which is what has my interest. If you’re inclined, I’d be grateful.

Well I went ahead and measured but I don't think it's going to tell you anything because there's a significant height difference between the serration grinds, so the Cruwear Ayoob is naturally thinner despite probably being a thicker blade grind.

Old, New:

1st serration, 0.059 vs 0.041
4th serration, 0.047 vs 0.047
8th serration, 0.038 vs 0.041
PE at the beginning after the last serration, 0.027 vs 0.025

I would say the difference in performance between the two blade grinds is negligible in all but some material that might separate easier around a thinner hollow grind, but once you reach the top shoulder of either grind and hit the full thickness of the blade stock it's equal, and the blade height and blade grind are so low on these knives neither one has much room to transition the grinds. If you're cutting rigid material that's taller than the blade grind, I doubt you'll notice a difference at all.

[wrdwrght]

Thanks, David.

As usual, complications have smashed my expectations. I need to think about your findings vs. a simpler PE to PE comparison.

I continue to think my old PE Ayoob cuts the same material easier than my new PE, but because I hand-sharpen, I have more variables at work than just hollow vs. saber grind.

[Josh Crutchley]

Just measured the M4 vs Maxamet Manix 2 LW.
M4 ~0.020" belly 0.026" tip
Maxamet ~0.023 belly 0.028" tip

I also updated some measurements in my last post after upgrading from a Harbor Freight caliper.

[Jjsim]

Hello
Have any of you been able to measure behind the edge of the Spyderco leaf jumper? VG10 or K390.
I am very interested in the K390 version

[elena86]

Hello
Have any of you been able to measure behind the edge of the Spyderco leaf jumper? VG10 or K390.
I am very interested in the K390 version

I am also very interested ! My guess is 0.23 … roughly