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TOPIC: A theory of how the WE diamond pastes work

Re: A theory of how the WE diamond pastes work 2 years 5 months ago #2487

  • wickededge
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Ooops, I did mean 59-60 RHC! :) I'll stitch the 1 micron paste image to the 1 micron paste + spray so we can compare them side by side.
--Clay Allison
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Re: A theory of how the WE diamond pastes work 2 years 5 months ago #2500

  • razoredgeknives
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Yeah Mark, you may be right... I guess I'm a little confused about which pictures were the right ones? These are the side-by-side comparisons that you posted Clay...
wickededge wrote:
So, here are side by side the 1µ - 300 passes and the 10µ -100 passes> 3.5µ - 100 passes> 1µ - 100 passes:

1micronafter1000grit-300passes-1stround.jpg

510x - 1µ - 300 passes

1micronafter3.5micron-150passes.jpg

510x - 10µ -100 passes> 3.5µ - 100 passes> 1µ - 100 passes

But then in the post above this one, you had another pic of a the same progression it seemed, ending with 100 passes on the 1m leather strops...

1micronafter3.5micron-100passes.jpg

510 x - 1 micron diamond and leather strops after 3.5 micron diamond and leather strops - 100 passes

Unless I missing something, there is a noticeable difference in the first two pictures, but a HUGE difference in smoothness in the last one...

I am referencing post # 2463 & 2464.
Last Edit: 2 years 5 months ago by razoredgeknives.
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Re: A theory of how the WE diamond pastes work 2 years 5 months ago #2501

  • wickededge
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In your post above, you've got images from two sets of tests, two on the AUS-8 knife and one on the CPM-154 blade.

Here are three from the CPM-154 knife:

3.5 Micron strops - 100 strokes:
3.5micronafter5micron-100passes.jpg

The bevel is very smooth after the 3.5 strops.

1 Micron Strops - both paste and spray - 100 strokes:
1micronafter3.5micron-100passes.jpg

There were many, more obvious scratches after adding the spray to the 1 micron strops. I had lost the 'stiction' here and seemed to be getting more abrasion and less burnishing.

1 Micron Strops - both paste and spary - 200 strokes:
1micronafter3.5micron-200passes.jpg

I did another 100 strokes with the 1 micron strops after the spray had dried. The stiction returned and the surface smoothed out immediately. I believe that once the spray dried, burnishing resumed and abrasion was minimized.
--Clay Allison
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Re: A theory of how the WE diamond pastes work 2 years 5 months ago #2504

  • BassLakeDan
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mark76 wrote:
When I first saw Tom’s microscope photographs of the edge of a knife after stropping with the 14 micron and 10 micron diamond pastes I was baffled.....

But in short I think the following is happening:
  • Both the balsa and the leather strops are hardly abrasive by themselves. They do not cause much burnishing by themselves either.
  • The strops become effective when loaded with the diamond pastes.
  • The diamond pastes cause a lot of burnishing, but hardly any abrasion.
It is the pastes that do the work, not the strops. And these pastes are hardly abrasive, but have a strong burnishing power.

Well, the whole subject of sub-micron particle stropping has me baffled in more was than one.. I question if it is even possible. See the following chart for a reality check on what worlds of size we are talking about then ask yourself. "what exactly is it am doing or trying to accomplish by putting this size particle on a sample of cow hide and hand applying that to a knife edge".., Hummmm.

Thanks to www.standridgegranite.com/calibration.htm#19 Standridge Granite company for the chart .. There are very few people in the world that know more about "flat" than these folks/. It would be interesting if we could get one of their engineer to participate on this thread !
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Re: A theory of how the WE diamond pastes work 2 years 5 months ago #2505

  • BassLakeDan
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well that chart did not take here on the forum board software, so let me try it again as a JPG..
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Re: A theory of how the WE diamond pastes work 2 years 5 months ago #2506

  • wickededge
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BassLakeDan wrote:
well that chart did not take here on the forum board software, so let me try it again as a JPG..

Thanks for jumping in and for your feedback and healthy skepticism. I took a photo last night of the CPM-154 blade after polishing with the .5 micron strops with a hair from my nephew's head for comparison:

withhumanhair.jpg


with-human-hair-zoom.jpg


You can just barely see the faint scratches on the surface and it seems possible to imagine fitting quite a lot of them into the width of that hair.
--Clay Allison
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