Polished edge ...... VS ... the rest .

[old4570]

Polished edge VS the rest ..

Originally the factory edge did 150
80 grit wet stone grinder edge did 350
And with the edge Fubar corrected on the wet stone grinder .. I put a nice polished edge on the knife ..
This resulted in a 100 slice roll that stropped back easy .
Did the polished edge feel better slicing rope = No .. & the only possible advantage is the strop back ..
Next edge will be 1000 grit diamond cut on the guided sharpener .
Yes , the knife is budget , the blade is 440 ( some sort of ) .. But we should get some interesting data !

 

[old4570]

1000 Grit put to the rope .. Resulting in a 250 Fail .
The edge is stropping back , but not as well as the polished edge ..
Next edge = 800 Grit

 

[old4570]

800 grit edge returns a 350 slice fail ...
Hmmm , this testing seems to be going in a certain direction !
Up next ! Will be a 600 grit edge .......

 

[old4570]

600 Grit edge hits the rope and returns ........... 400 slices ..
That's another increase .. Not a large increase , but still an increase .
Polished edge = 100 roller
1000 grit edge = 250
800 grit edge = 350
600 grit edge = 400

Well , we have certainly been moving in a direction ..
Yes , I realize this is not some Uber Steel .. But rather some average 440 ( allegedly ) ...
But the results kind of speak for themselves ..
NEXT = A 400 grit edge !

 

[stonemedusa6264]

Check out science of sharp dot com... It's a a blog by really smart people with access to crazy gear. To polish an edge and do it right takes a lot. I think its the s110v articles. Under a crazy microscope with cross sections of the edge you see whats happening on a microscopic level.

You're not not using high carbide steels so that makes a difference. I don't know that you'd get the cracks without a high carbide content. I think you prefer edge trailing strokes and in s110v that forms a foil edge. I'd have to guess you're getting even more foil/burred edge with your polish that you'd only see under a microscope like they have. That's why it strops back easier.

If I had time I'd be interested in a test that compares push cuts only. I've heard polished is better for push cuts and coarse is better for slice cuts. In my experience knifing stuff I tend to believe it. I still haven't found a direct comparison in a test though. I don't think it'd matter how many but how hard you had to push for this test. Maybe how much it could cut through a huge rope with a set force?

Science of sharp is also the place that helped the youtubers figure out what happens with a some what cheaper steel and dual grit edge. This whole post is off memory but I think the youtubers got the best results with that cheaper steel and dual grit, and the one has probably cut more rope than anyone else will in a lifetime.

 

[old4570]

400 grit hits the rope !
Result is a 400 slice fail @ 400 grit .. So no improvement over 600 grit !
Next obvious edge would be 240 grit , as this edge has in the coarse grit tests done extra ordinarily well ...
Butt @ it's a huge butt ..... I can't replace the rope I am using right now .. Looks like Feebay has none to sell !
So testing has to be halted for now .. Yeah , burning rope for just knowledge (?) ... + A 500% price hike to buy 10meter lengths is just so not on ...........