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High-Performance Blades Sharing ideas for getting the most out of our steel. |
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#1
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Barely Convex
I was setting the initial edge on a new knife and ended up doing something a little different - for me at least.
I was using Norax belts and a platen - which have a little give compared to waterstones. I also had some graphite belting under it, which added more 'give'. The result was a convex edge. I expect that to happen somewhat because of the less than hard surface. But based on the way light reflects I see more convex than I expected. Still less convex than a slack belt. So, I finished up with a 5x and then a leather belt. I think I'll call the results - barely convex. Kinda fun because the look has a pretty definiate edge like like a flat edge (I like that look), but not a solid reflection. Dang that sucker is sharp and slices stuff like the dickens! Haven't run any durability tests yet, but I expect it will do quite well. Steve See Jerry - I listen! |
#2
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Hey Steve, does Norax make those belts in 1x42"? I really like a convex edge for heavy cutting, otherwise I like the v-grind.
Thanks! |
#3
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I recently tried shaving my face with two of my knives with thin blades that have convex grinds. One is a warncliffe blade in S30V and the other a small drop point bird and trout knife in D2. Both are 3/32" thick and sharpened through polishing with translucent Arkansas stone and then stropped with CrO rouge.
With three days growth, the S30V shaved cleanly and the D2 a little less smoothly, but still did the trick. There may be some bias here as I am right handed and did the right side with S30V and the left with D2. Faces are a lot harder to shave than arms, but these convex edges performed better than I thought they might. I don't normally shave with a straight razor and wasn't sure I could pull it off. The point is that I don't think convex edges are only good for hard, tough applications. Using thinner stock for lighter blades, you can get very fine edges with shallow angle convex grinds. __________________ "I want to play with your poodle" Lightnin' Hopkins, long ago Steve Hayden steve4663@gmail.com Aztec, NM |
#4
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Steve,
Shaving - like the face? and neck! Don't have the guts myself. But I feel challanged - I'll try it. Actually I'm a a bit suprised too. Thought a convex wouldn't do that so well. How thin was the edge before you sharpened it. --------------------------------------------- I posted this without a question. But had one in mind for Jerry: When you are talking convex, just how convex are we talking? I mean I can start with a .040" edge and use a very slack belt and get a nice round edge. The other extreme is what I was talking about where it is slightly convex right at the edge. So, just how convex for the that high-performance hunting knife? Steve PS No I don't have a clue how to quantify convex. Flat ground is easy you have angle, but convex? |
#5
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I start these knives with 3/32 stock, grind distal taper and pretty close to a full convex grind. They are very thin at the edge. I start with an almost flat grind on the platen, gradually slightly round it and shape the smooth curve with the slack belt. There is a wide range to slack belt grinding, depending on belt tension,belt grit and type and pressure applied.
I have to admit that I chickened out on the neck with the D2. It was on the wrong side and discretion kicked valor's butt. The S30V was very smooth-not good enough to give up the three blade cartridge though. __________________ "I want to play with your poodle" Lightnin' Hopkins, long ago Steve Hayden steve4663@gmail.com Aztec, NM |
#6
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For about a year now I've been using a rotary platen for my sharpening because I can adjust the amount of slack I want for each edge. It allows better control than the slack belt and is less likely to make the final edge too steep.
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#7
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Yeah I think barely convex sounds right.
I use a thin cotton pad on my 5160 platten. It's a piece of and old outboard motor cover. very little flex but enouch to stop the belt join from making noise. I flat grind and blend in the edge grind and then sharpen with the pad on the platten. Holds and edge real well. Take Care TJ __________________ TJ Smith Knifemaker |
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blade, hunting knife, knife, knives |
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