Mirrored edges, whats the point?

[smokey0118]

Cool. Thanks for the extra information and your contributions. I occasionally search your new posts to see what new stuff I can pick up. Have a nice evening.

Thanks to you too hardheart

 

[Ankerson]

Larger carbides mean a weaker position in the edge, and easier tearout. Sandvik posted a micrograph of carbide tearout in 440C,

and Roman Landes has done studies on it and focused on it in his books. It is part of the basis for his described property of edge stability. But you need to read German to get the info.

Here's something he made that may help. http://www.hypefreeblades.com/files/schneiden.pdf

Yeah I read that awhile ago.

But enter in PM technology and grain refinement so we can have steels with very high carbide content that are very fine grained.

CPM 10V is the 1st example of this as you know.

 

[longun]

I read some saying polished is better for a push cut and a rougher finish is better for slicing. I don't see the difference between the two styles of using a knive. You only have a certain length of edge to work with. What could the difference in direction be? Could it be that if you want to "slice" on a draw stroke you should sharpen a knife using a draw stroke over the stone. And if you want cut with a "push" stroke, you should sharpen your knife with a push stroke over the stone? Or maybe vice versa? And maybe it is not the finish of the edge, but the direction of the edge that matters. I think that I need to do some expermenting!

 

[hardheart]

push cut has no lateral motion. It isn't push forward, it is push down.

 

[longun]

Thanks hardheart! Starts to make sense now.

 

[ginaz]

i seem to remember spyderco mentioning this in the sharpmaker info, drawing the blade through to give a certain direction to the scratch pattern

 

[me2]

One thing I've discovered is that the harder the material you're cutting, the more you benefit from a polished edge. I've tested edges on all manner of things. For rope, coarser is better to a point. For aluminum cans, polished wins. The micro serrations just can't handle the harder materials. Heavy zip ties and plastics in general seem to have less effect on polished edges as well.

 

[Ankerson]

One thing I've discovered is that the harder the material you're cutting, the more you benefit from a polished edge. I've tested edges on all manner of things. For rope, coarser is better to a point. For aluminum cans, polished wins. The micro serrations just can't handle the harder materials. Heavy zip ties and plastics in general seem to have less effect on polished edges as well.

With the harder materials the steel really matters a lot, it can make a HUGE difference as can high hardness and compression strength.

Also keeping the edge inline with the spine can solve some issues.

 

[kurodrago]

One thing I've discovered is that the harder the material you're cutting, the more you benefit from a polished edge. I've tested edges on all manner of things. For rope, coarser is better to a point. For aluminum cans, polished wins. The micro serrations just can't handle the harder materials. Heavy zip ties and plastics in general seem to have less effect on polished edges as well.

True, I never see a scalpel with micro serrations for working hard wood, I never see a kiridashi with micro serrations, definitely I never see a surgical bistoury with micro serrations.
Its funny how some people need to adjust by statement:thumbup:

 

[MR.GRIMM]

Polished edges are just a sick addiction for us obsessive compulsive types.

 

[severedthumbs]

I find a edge put on with a worn 220 grit slack belt cuts really well