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TOPIC: A theory of how the WE diamond pastes work

Re: A theory of how the WE diamond pastes work 1 year 11 months ago #6584

  • wickededge
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Okay :) I'll try to get some better pictures of it. In that one section the metal is smeared across those scratches, filling in the valley. It may be easier to show if I start with a slightly rougher surface. Stuff to work on...
--Clay Allison
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Re: A theory of how the WE diamond pastes work 1 year 11 months ago #6591

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Here are a couple more images of a knife edge at 2000x. In order to make a fair comparison, it's essential to capture the same features in each image and at high magnification, it's hard to find your way back to a tiny feature after you've removed the sample. What I did to solve the problem was to make a nick in the blade. A laser or engraving machine would have been great, but I had to make do with what I had - another sharp knife! After creating the nick, I sharpened the knife with the 400# diamond plates because I wanted fairly deep grooves with tall ridges. I completed 20 strokes per side, perpendicular to the edge. I then made one stroke parallel to the edge. I knew I'd be able to find the edge of the nick in the microscope and then all I had to do was locate a unique intersection of scratches:

400-Grit.jpg


I removed the sample and cleaned it well, the completed 5 strokes per side with firm pressure using .75um CBN on cow leather. I had not trouble locating the same intersection again and getting another picture:

75-CBN-after-400-Grit.jpg


It's hard to believe that only 5 strokes makes such a huge difference. I originally did my testing with quite a few strokes and found to my chagrin that I'd obliterated almost all the scratches from the stone.
--Clay Allison
Last Edit: 1 year 11 months ago by wickededge.
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Re: A theory of how the WE diamond pastes work 1 year 11 months ago #6592

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I decided to repeat the process with the 100# diamond plates:

100-Grit.jpg


75-CBN-after-100-Grit.jpg
--Clay Allison
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Re: A theory of how the WE diamond pastes work 1 year 11 months ago #6593

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I'm going to try again with the 50# diamond plates because I want to see if the metal is actual being moved, not just abraded. I'll go with coarser strops as well so we can see the abrasion from those clearly.
--Clay Allison
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Re: A theory of how the WE diamond pastes work 1 year 11 months ago #6594

  • mark76
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Wow, that's great! These photographs show very well what how burnishing works!
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Re: A theory of how the WE diamond pastes work 1 year 11 months ago #6595

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Same experiment, this time with the 50# diamond plates. Again, only 5 strokes with the strops.

50-Grit.jpg


75-CBN-after-50-Grit.jpg
--Clay Allison
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