Funny Video From Spiderco

NRA

NRA

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Feb 15, 2014
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The founder of Spiderco, try's to educate us on convex grind knife blades, and in a round a bout way, talks down about them.

At 5:45 is where on the video, the humor starts.

What is funny about this? Every time a person uses a Spiderco SharpMaker on a blade, because of inexact movements off of true plumb, after a hundred or so strokes, every edge you make with a SharpMaker is a convex edge.

Am I the only one that sees the humor in this?

Don't get me wrong, I think the SM is a great sharpener, but the owner of the product should at least know what his product does to a knife blade.


[video=youtube_share;2suoKFNF2gE]http://youtu.be/2suoKFNF2gE?t=5m46s[/video]
 
I'm pretty sure Sal Glesser knows what his products do ;)

And on a side note, its Spyderco, not Spiderco. That was driving me crazy!
 
Convex is too generous ;)... More likely to have a soft shoulder (from tilted-toward the rod) and a micro-bevel (from tilted away). And everything in between mostly will flatten the bevel because the nature of random oscillation. Only harmonic/Eigenvalue wave/oscillation can create a bevel face.


NRA said:
...
What is funny about this? Every time a person uses a Spiderco SharpMaker on a blade, because of inexact movements off of true plumb, after a hundred or so strokes, every edge you make with a SharpMaker is a convex edge.
...
Click to expand...
 
Convex grind and convex edge are not, strictly speaking, the same thing. I'm also not sure where you inferred he was talking down about convex grinds. He did say they're not used as often as hollow or flat grinds, but I would say that's relatively true in the cutlery world. I've also never noticed any appreciable convexing of my edges when using a Sharpmaker, not even under magnification. Your results may very well be different.
 
Under magnification, and one point of light, I see roundness of the edge, I do not see in factory flat grinds or on sharpeners like KME, or Edge Pro.

Is it possible, my arm is not steady enough? Is it possible anyone is steady enough to do 100 repetitive motions, and not deviate from true plumb?

I would like to see the edge of anyone that thinks they can hold a knife plumb through a sharpening session on a SharpMaker.
 
bluntcut said:
Convex is too generous ;)... More likely to have a soft shoulder (from tilted-toward the rod) and a micro-bevel (from tilted away). And everything in between mostly will flatten the bevel because the nature of random oscillation. Only harmonic/Eigenvalue wave/oscillation can create a bevel face.
Click to expand...

Wonderful post! I see a rounding of the edge on two sharpeners I own, my WorkSharp, and my SharpMaker.
 
Watched the segment mentioned three times, and I don't see or hear Sal 'talking down' about convex at all. He pointed out the characteristic shape of the grind, and it's history (dating back to 800 AD Japan; sounds like respect from Sal, for mentioning this), and a common use (chopping) associated with convex edges. All valid points worthy of explanation to someone learning the basics of sharpening knives, especially in the context of his overall 'lesson' explaining differences between each grind. But at no time did I hear anything condescending, nor even remotely 'funny', in his explanation or tone.

I'm SURE he knows better.


David
 
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I didn't hear any putting down of convex grinds, either. :confused: I guess one could end up with a somewhat convex edge using the SM, depending upon how steady their hands are. Sal wasn't talking about edges at that point, though, rather about the actual grinds used to reach the edge (the full grind of the blade: hollow, flat, convex, etc.).

On a side note, Sal would make an awesome teacher, with his mild, calm manner and clear explanations of ideas. :thumbup::cool:
 
Mind you that video is to teach anyone including complete novices of the TV infomercial kind (non knife folks) to learn how to use his product. I think he did a good job and squeezed as much info as he can for what it is. I didn't see the humor, roundabout talking down that you did.
 
G. Scott H. said:
I didn't hear any putting down of convex grinds, either. :confused: I guess one could end up with a somewhat convex edge using the SM, depending upon how steady their hands are. Sal wasn't talking about edges at that point, though, rather about the actual grinds used to reach the edge (the full grind of the blade: hollow, flat, convex, etc.).

On a side note, Sal would make an awesome teacher, with his mild, calm manner and clear explanations of ideas. :thumbup::cool:
Click to expand...

He's like the Bob Ross of knives.
 
I think he did a good job of presenting his material. I also think the intro paper cutting demonstration on the video was not from a dull knife, sharpened on this infomercial. I would bet a dollar on that.
 
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