Chiral.grolim,
We have very different opinions about what machines are doing - and about convex edges.
It is a myth that convex edges are superial all other types of edges. They are not. Convex edges are only one type of edge along other type of edges.
Convex edges are the oldest man made edges there is. All ready the stone age people use convex edges, bronze age people use them, iron age people use them. Around 11-1200 the grinding wheel was innovated - and now become concave edges popular, soon every farm had a grinding wheel. During 1700-1800 tye flat hard sharpener was innovated, and flat edges become popular. Convex edges is not something new...
Stone age people had a big problem. Their edges was to sharp and to brittle. They have edges in flint and vulcanic glas, 1 molecyle thick. They was superial sharp, we cannot come even close to that sharpness today. They started to grind their edges, not to get them sharper - they grind them to get edges that holds for their type of work, thicker edges, higher edge angles - and their edges was all convex.
The bronze age people dis not sharpen their edges with sharpeners, they hammered their edges sharp. Bronze Can be hammered very nice - and if they got a chip in their edges they could move material from behind the edge and Fil out the chip.
Iron age people could not so that, so they use natural sharpening soft stones that very fast become concave = their edges become convex. You cannot make a flat edge with a concave sharpener.
Then we have the woodworking specialists, they needed flat very sharp edges fo do their job. They innovated sharpening tools. The dirst drawings we jave on sharpening tools is from about 11 - 1200. They show turning grinding wheels, how to sharpen flat edges, and how to grind out concave parts on swords. Sharpening tools have been used in, at least, 1000 years - becouse specialists need them to get the type of edge they need to have.
So, the oldest man made edges in the world was convex, next step was concave, the third step was flat edges.
Wood workers never use xonvex edges, they only use flat edges, as flat as possible. Have you ever seen a chissel with a convex edge? Or a wood workers knife with convex edge? Why have carpenter axes flat edges?
Convex edges are good dor some type of work, bad for other type of work. We have some different types of edges we can use - and we choose that type of edge that work best for us when we shall do something. We also use the edge angle that work best for us dor the job we shall do, flat edge, 18-19 degree total - for soft wood. Flat edge, 23-24 degree total edge - for hard wood. 26 degree convex edge with 3 degree convex sphere for a allround knife, and so on. That is what I use here in Scandinavia. They fits our climate, our type of wood, our games and our fish.
Thomas
We have very different opinions about what machines are doing - and about convex edges.
It is a myth that convex edges are superial all other types of edges. They are not. Convex edges are only one type of edge along other type of edges.
Convex edges are the oldest man made edges there is. All ready the stone age people use convex edges, bronze age people use them, iron age people use them. Around 11-1200 the grinding wheel was innovated - and now become concave edges popular, soon every farm had a grinding wheel. During 1700-1800 tye flat hard sharpener was innovated, and flat edges become popular. Convex edges is not something new...
Stone age people had a big problem. Their edges was to sharp and to brittle. They have edges in flint and vulcanic glas, 1 molecyle thick. They was superial sharp, we cannot come even close to that sharpness today. They started to grind their edges, not to get them sharper - they grind them to get edges that holds for their type of work, thicker edges, higher edge angles - and their edges was all convex.
The bronze age people dis not sharpen their edges with sharpeners, they hammered their edges sharp. Bronze Can be hammered very nice - and if they got a chip in their edges they could move material from behind the edge and Fil out the chip.
Iron age people could not so that, so they use natural sharpening soft stones that very fast become concave = their edges become convex. You cannot make a flat edge with a concave sharpener.
Then we have the woodworking specialists, they needed flat very sharp edges fo do their job. They innovated sharpening tools. The dirst drawings we jave on sharpening tools is from about 11 - 1200. They show turning grinding wheels, how to sharpen flat edges, and how to grind out concave parts on swords. Sharpening tools have been used in, at least, 1000 years - becouse specialists need them to get the type of edge they need to have.
So, the oldest man made edges in the world was convex, next step was concave, the third step was flat edges.
Wood workers never use xonvex edges, they only use flat edges, as flat as possible. Have you ever seen a chissel with a convex edge? Or a wood workers knife with convex edge? Why have carpenter axes flat edges?
Convex edges are good dor some type of work, bad for other type of work. We have some different types of edges we can use - and we choose that type of edge that work best for us when we shall do something. We also use the edge angle that work best for us dor the job we shall do, flat edge, 18-19 degree total - for soft wood. Flat edge, 23-24 degree total edge - for hard wood. 26 degree convex edge with 3 degree convex sphere for a allround knife, and so on. That is what I use here in Scandinavia. They fits our climate, our type of wood, our games and our fish.
Thomas
These are not "opinions", they are demonstrable facts.
