Raised a burr on H1

[sircantaloupe]

Today I put in a lot of hard work on a stone changing my Salt 1 to a flat saber grind from a hollow grind. When restoring the cutting edge on it afterward, I raised a burr. Now, I sharpen with sandpaper and a mousepad - I have never raised a burr before on anything I sharpened outside of super crappy china stainless. In fact, when I had sharpened the Salt 1 before reprofiling it, I never raised a burr. So I'm wondering what happened - H1 is supposed to work harden. Shouldn't my lengthy efforts at reshaping it have hardened it? If so, why would I have gotten a burr? I thought burrs were only supposed to happen on softer steels. Did I wear away the work hardened edge and expose soft metal? What's going on here?

 

[spoonrobot]

I think a burr can happen on any type of steel, actually, depending on your sharpening style it's something that's supposed to happen. I raise one on my ZDP Stretch, it tells me when it's time to switch sides.

 

[OldDude1]

Greetings Sircantaloupe: Since I only have one H1 blade my observations are limited. It appears that the H1 "work hardening" is more a function of pressure than abrasion. A light pressure on the stones, which is probably best for obtaining a good edge, does not seem to be enough for work hardening the steel. Edge contact pressure with whatever is being cut however, seems to produce a harder edge. I noticed this when touching up the edge after use. Using the ceramic Sharpmaker stone corners seems to concentrate the pressure in a very small contact area which results in working hardening of the cutting edge. Very light contact pressure using the EdgePro water stones just seems to remove the already hardened edge and exposes the softer steel behind and below. The same amount of ceramic rod contact pressure that produced micro chipping when putting a 30 degree edge on a new S30v Sebenza , works just fine when applying a 40 degree edge to the H1 Spyderco Salt. I did raise a VISIBLE burr on the H1 with the EdgePro. I did not observe a VISIBLE burr using the Sharpmaker. This could be due to the different techniques used with each system. You may wish to "lean into " whatever you are cutting when first using your newly reground blade, then resharpen it. You can feel the before and after difference in hardness as you run the edge along the stones. Or, I could just be senile. OldDude1

 

[ChapmanPreferred]

I wonder if you were using more pressure than you usually use because you had just finished the regrinding of the primary bevel? That would make it more likely for you to create a burr when you normally do not in your sharpening efforts. Just a thought.