- Joined
- Apr 3, 2011
- Messages
- 5,811
I just reground a home made 1095 blade, convex zero grind and polished the edge area. Then did some light carving in hard wood to see how the apex would fair to see if I needed to make any adjustments. I was scooping the bottom of the dip out in the wood with a little (not much) lateral apex pressure going on (no twisting though). Then when I examine the edge I find a chip and a crack that extends about .187" back into the grind. For an idea on thickness, at .070" back from the apex (basically where the 'shoulder' of the edge is) it's .020" thick, and at .187" back from the apex it's .038" thick. Spine thickness varies but is .095-.0110".
Any thoughts on what's going on here? Never had this happen before, and on such light testing it is quite strange. I know it was power ground before I got it and owner said that 1/8" of edge was lost. I don't know if this would be a heat treat thing, or heat damage, or just too thin of geometry but normally I would expect the thinner apex to fail far before the thickness in the grind does.
I'm getting details on heat treat now.
Any thoughts on what's going on here? Never had this happen before, and on such light testing it is quite strange. I know it was power ground before I got it and owner said that 1/8" of edge was lost. I don't know if this would be a heat treat thing, or heat damage, or just too thin of geometry but normally I would expect the thinner apex to fail far before the thickness in the grind does.
I'm getting details on heat treat now.
