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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 3 months ago #2468

  • wickededge
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New study, different steel. This is a knife that I had made from CPM-154, hardened to 69-70 RHC.

I started with a polished edge, then went back to the 1000 grit stones before progressing to the strops. Here is the edge after the 14µ strops:

14micronafter1000grit-100passes.jpg

510x - 14µ diamond and leather strops after 1000 grit diamond stones - 100 passes

10micronafter14micron-100passes.jpg

510x - 10µ diamond and leather strops after 14µ diamond and leather strops - 100 passes

5micronafter10micron-100passes.jpg

510x - 5µ diamond and leather strops after 10µ diamond and leather strops - 100 passes

3.5micronafter5micron-100passes.jpg

510x - 3.5µ diamond and leather strops after 5µ diamond and leather strops - 100 passes
--Clay Allison
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Re: A theory of how the WE diamond pastes work 2 years 3 months ago #2469

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Next I decided to throw in a little side experiment - I sprayed some Hand American, 1 micron diamond spray on my already pasted 1 micron strops - big difference here, though not totally surprising:

1micronafter3.5micron-100passes.jpg

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

There are clearly a LOT more diamonds than when I was using the strops with just the paste. Additionally, most of the 'stiction' was gone from the strops after spraying with the HA spray. I decided to do another 100 passes and started getting back to good 'stiction':

1micronafter3.5micron-200passes.jpg

510x - 1µ diamond and leather strops after 3.5µ diamond and leather strops - 200 passes

For reference, here is a pic of the 1 micron pasted strops from a little earlier before adding the 1 micron spray:

1micronafter3.5micron-150passes.jpg
--Clay Allison
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Re: A theory of how the WE diamond pastes work 2 years 3 months ago #2471

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razoredgeknives wrote:
Man, that is really weird why the lapping films were so slow working and hardly did anything... I can't believe it! My assumptions were totally opposite... lol, it seems as if the only way you can get a fast cutting consistant edge at sub micron levels is with the shaptons... I just don't have a grand to drop on stones right now :(

* edit: keep the test coming Clay! lol, there's gotta be another answer! I haven't given up hope!

If you can hold out til mid-May, I might have just the thing for you!
--Clay Allison
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Re: A theory of how the WE diamond pastes work 2 years 3 months ago #2472

  • mark76
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wickededge wrote:
So far, it seems like we've confirmed that the best stropping effects come from burnishing, which happens when there is adequate 'stiction'.

+3.

However, this is the Wicked Edge pastes. Tonight I took photographs of the edge after stropping with Dovo paste. But it is 0:40 in the night here and somebody in the next room is saying I must come to bed. Up tomorrow :-).
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Re: A theory of how the WE diamond pastes work 2 years 3 months ago #2479

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mark76 wrote:
wickededge wrote:
So far, it seems like we've confirmed that the best stropping effects come from burnishing, which happens when there is adequate 'stiction'.

+3.

However, this is the Wicked Edge pastes. Tonight I took photographs of the edge after stropping with Dovo paste. But it is 0:40 in the night here and somebody in the next room is saying I must come to bed. Up tomorrow :-).

Can't wait to see your results!
--Clay Allison
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Re: A theory of how the WE diamond pastes work 2 years 3 months ago #2482

  • mark76
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Interesting experiments again, Clay!
wickededge wrote:
Slight tangent here - polishing tapes... I decided to retest the polishing tapes, starting from a polished bevel and counting strokes, so here goes, working backwards from 1 micron polish:

7000gritafter1micronpolish.jpg

510x - 7000 grit polishing tapes after 1 micron polish - 100 passes

3000gritafter7000grit.jpg

510x - 3000 grit polishing tapes after 7000 grit tapes - 100 passes

These look better than yesterday's results but not overwhelming.

Why do you think they are not overwhelmingly better? I clearly see scratches now that (I hope) are from the polishing tapes. They are also quite evenly spaced, creating a nice pattern almost like what a stone would do.

By the way, with current knowledge (it changes per day :) ) I think this it the way to test the very low micron size compounds/tapes/stones: first burnish the edge until it is very smooth (e.g. using the 1 micron paste, but I wouldn’t be surprised if the 14 micron paste worked as well :) ) and then do strokes with the fine stuff.
razoredgeknives wrote:
Thanks so much for this Clay! It would, in fact, seem as if the 10>5>3.5 progression yields better results in the end... wasn't so clear in the first one

I think we should be careful in drawing such conclusions too early. In one post Clay noted that the 1 micron compound had by far the most stiction. That would imply that 300 strokes with the 1 micron paste should produce more burnishing than 300 strokes (in total) with the 10-3.5-1 micron pastes. But in fact the surface of the edge after the latter progression looks smoother.

I had similar results: sometimes a particular compound seemed to cause more burnishing than another compound, whereas in different circumstances the results were exactly the opposite. I think this might very well be the result of the way in which the strops were seasoned (and the amount of paste applied).
wickededge wrote:
New study, different steel. This is a knife that I had made from CPM-154, hardened to 69-70 RHC.

Are you sure that hardness isn’t a typo, Clay? But good to see the burnishing works just as good on harder steels!
wickededge wrote:
Next I decided to throw in a little side experiment - I sprayed some Hand American, 1 micron diamond spray on my already pasted 1 micron strops - big difference here, though not totally surprising:

1micronafter3.5micron-100passes.jpg

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

There are clearly a LOT more diamonds than when I was using the strops with just the paste.

I am not quite sure what I see here. I I do see scratches, but not as many or as regular as those that would be caused by a 1 micron stone. Is that correct, Clay? If you’d increase the amount of spray applied, would the number of scratches increase and a more regular pattern appear?
Last Edit: 2 years 3 months ago by mark76.
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