Review of sharpening a Spyderco Maxamet knife with the Matrix stones.
Thanks again to DeadboxHero for letting me have this knife for a few days so I could sharpen it. This is the first time I have sharpened anything harder than 440c ish blades, other than ceramic. Short version is it's a little slow to set the bevel but once that is done the rest goes just a bit slower than what I am used to. The finished results are spectacular!!!! I flat LOVE this steel. VERY hard, fine grained, and pretty much no microchipping which I find interesting since I usally have some with my other knives if I am not careful.
Ok, now the long version. I started out setting my Apex at 21 degrees and began grinding away with a little pressure, about double the weight of the stone and arm, with bidirectional strokes. Before I reached the apex I tried a 320 Alox stone just to see for myself what it would do, which was nothing. Back to the Matrix 300 but once I started rasing a burr I noticed some damage at the apex with coresponding scratches in the bevel so I switched to edge trailing only strokes. Once I was getting a burr along the length of the blade I played with getting the best edge possible by using only the weight of the stone and arm and making only 7-10 passes per side of the blade. This made a big difference in the integrity of the apex and the size of the burr, it got really small considering it is a 300, 80 micon, stone.
Bi-directional passes on the right, edge trailing on the left. Notice the scratches leading to the edge damage on the bi-directional passes from edge leading strokes. This is pretty common, in my experience, which is why I use edge trailing strokes. The bevel is about .075" wide.
Here is the knife after I am done with the Matrix 300 stone, softer steels don't polish up like this at this point. It is still pretty rough but it sort of shaves even without removing the burrs with something finer. The microscope photos make the scratches look a lot worse.
Next I spent about 2 or 3 minutes with the 650. It looks like I could have cleaned up the apex a little better but it turned out this was enough. Burrs are pretty minimal, especially considering I only use edge trailing strokes.
Afte about 2 minutes with the 1100 this is what I got. The apex is starting to look good. Burrs really can't be felt and it is shaving pretty well by now.
On to the 2300 stone for around 2 minutes. Photo are the same except the one on the right is a little higher magnification.
Now for around 2 minutes with the 4000 stone. This is where I should have stopped, but I have to find out the hard way. Again the photo on the right is just better magnification.
Woops, lost 2 photos, and it's dinner time. I will finish this tonight. Sorry for the delay.
2 minutes with the 9k stone, I don't have a 6500 right now so this is the next step. As you can see it is not working very well. Although it works for most of the surface there are a few deeper scratches.