Welcome, Guest
Username: Password: Remember me

TOPIC: Stroke Direction

Stroke Direction 11 months 6 days ago #13491

  • wickededge
  • wickededge's Avatar
  • NOW ONLINE
  • Administrator
  • Posts: 1751
  • Thank you received: 598
  • Karma: 91
Some Faith Restored! :)

I'll post a whole write up soon, but for now I'll leave the following: I took a blade up through 10k Chosera and then on to the .25um kangaroo strops. At 10k it wasn't really popping hairs in the hanging hair test, but after the roo strops, it was consistently returning values of HH4 and HH5 (reference here). From there, I took it to the sharpness tester and got great results: 34% less force than with the 100# plates.
--Clay Allison
The administrator has disabled public write access.

Stroke Direction 11 months 5 days ago #13493

  • DanMaloon
  • DanMaloon's Avatar
  • OFFLINE
  • Expert Boarder
  • Posts: 115
  • Thank you received: 57
  • Karma: 4
I was about to start to sharpen knives on cinder blocks haha
The administrator has disabled public write access.

Stroke Direction 11 months 5 days ago #13494

  • wickededge
  • wickededge's Avatar
  • NOW ONLINE
  • Administrator
  • Posts: 1751
  • Thank you received: 598
  • Karma: 91
Here's a nice micrograph of the 10k>.25um blade:

hd320517.jpg

10k Choseras> .25um Diamond on Kangaroo Strops - 2000x

I wasn't trying for perfection with the strops and only did about 20 strokes per side. It's always fascinating to me how quickly the convex shaping happens with the strops, especially considering that I lowered the angle by 1 degree and the leather on the roo strops is very thin. The big scratch in the blade measures 3.66um at the widest point.
--Clay Allison
The administrator has disabled public write access.

Stroke Direction 11 months 5 days ago #13495

  • wickededge
  • wickededge's Avatar
  • NOW ONLINE
  • Administrator
  • Posts: 1751
  • Thank you received: 598
  • Karma: 91
Went ahead and took things a step further. I went back through the Chosera stones from 2k>3k>5k>10k and then on through .25um diamond on roo to .125 CBN on roo. This time I lowered the angle by 2 degrees before stropping. I did the hanging hair test at each level. Here are my results:

2k Chosera = HHT Fail
3k Chosera = HHT Fail
5k Chosera = HHT Fail
10K Chosera = HHT Fail
.25um Diamond = HHT3-HHT4
.125um CBN = HHT4-HHT5

This sounds like it could be a negative review of the Chosera stones, but it really is not. The reality is that they quickly and easily allowed me to take an edge that had been experimented on for two days with a huge variety of stones and transform it into a cutting superstar. Once I got them to the 10k level, taking the step further with the strops was a breeze and only required a few strokes. Here is a nice picture of the edge all cleaned up:

he78af2d.jpg

10k Choseras> .25um Diamond on Kangaroo Strops> .125 CBN on Kangaroo Strops - 2000x

On Monday I'll run it through the sharpness testing jig and see what kind of results I get.
--Clay Allison
The administrator has disabled public write access.

Stroke Direction 11 months 5 days ago #13496

  • PhilipPasteur
  • PhilipPasteur's Avatar
  • OFFLINE
  • Platinum Boarder
  • Phil
  • Posts: 944
  • Thank you received: 233
  • Karma: 66
wickededge wrote:
Some Faith Restored! :)

I'll post a whole write up soon, but for now I'll leave the following: I took a blade up through 10k Chosera and then on to the .25um kangaroo strops. At 10k it wasn't really popping hairs in the hanging hair test, but after the roo strops, it was consistently returning values of HH4 and HH5 (reference here). From there, I took it to the sharpness tester and got great results: 34% less force than with the 100# plates.

I think that is why I wrote "more to come"..
Very interesting.. and faith being restored by the test..

I love the Chosera stones to 10K as a base for getting "super" edges...
Phil

MAX 2001-2013
Hoping there is that bridge!
I miss you Buddy!
The administrator has disabled public write access.

Stroke Direction 11 months 5 days ago #13497

  • razoredgeknives
  • razoredgeknives's Avatar
  • OFFLINE
  • Platinum Boarder
  • Posts: 692
  • Thank you received: 288
  • Karma: 38
Wow! I can definitely see a difference in the second picture where you tried harder :-) much crisper and cleaner! That is nice!
The administrator has disabled public write access.

Stroke Direction 11 months 5 days ago #13509

  • PhilipPasteur
  • PhilipPasteur's Avatar
  • OFFLINE
  • Platinum Boarder
  • Phil
  • Posts: 944
  • Thank you received: 233
  • Karma: 66
bottom line is..it looks like sharp is starting to show up as sharp...

:evil:
:lol:

:P
Phil

MAX 2001-2013
Hoping there is that bridge!
I miss you Buddy!
The administrator has disabled public write access.

Stroke Direction 11 months 5 days ago #13512

  • razoredgeknives
  • razoredgeknives's Avatar
  • OFFLINE
  • Platinum Boarder
  • Posts: 692
  • Thank you received: 288
  • Karma: 38
Clay, how many passes did you do at the .25 and .125 strops? just curious...
The administrator has disabled public write access.

Stroke Direction 11 months 3 days ago #13539

  • wickededge
  • wickededge's Avatar
  • NOW ONLINE
  • Administrator
  • Posts: 1751
  • Thank you received: 598
  • Karma: 91
razoredgeknives wrote:
Clay, how many passes did you do at the .25 and .125 strops? just curious...

That was after a total of 70 strokes per side. I'll go ahead and do some more stropping and see what kind of improvement I get.
--Clay Allison
The administrator has disabled public write access.
The following user(s) said Thank You: razoredgeknives

Stroke Direction 11 months 3 days ago #13540

  • LeoBarr
  • LeoBarr's Avatar
  • OFFLINE
  • Platinum Boarder
  • Posts: 675
  • Thank you received: 226
  • Karma: 33
One thing I have missed is what type of steel are you using for these tests I have read that the latest wonder steel is hap40 a powdered steel from Hitachi with a possible rockwell hardness of 68 this steel I have read has incredible edge retention capabilities so much so someone nicknamed it voodoo steel since it holds an edge so well!
I think the work is most interesting sharpening techniques must have different results on different steels would they not .
Early days I am sure but these Hitachi super steels must respond differently when sharpened to say the steel of Henkels or Worstoff .
I wonder if there is less of a need for extensive stropping on these super steels would not the whole appearance of these super hard steels have a much finer appearance under high magnification therefore producing a far finer edge.(say at a near molecular level would the steel be closer knit I would expect say a poor quality steel to have more impurities therefore a less dense structure)
This is pure speculation on my part with a very basic knowledge of metallurgy & chemistry.
Perhaps your test will bear this out.
The administrator has disabled public write access.
Time to create page: 0.147 seconds