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TOPIC: Diamond Sprays

Re: Diamond Sprays 1 year 1 month ago #11869

  • ToddSimpson
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2" English Bridle strop
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Re: Diamond Sprays 1 year 1 month ago #11870

  • PhilipPasteur
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It seems that those larger particles do leave visible scratches, but there is no effect on the edge.

Pretty much an impossible concept for me to grasp. If the particles are leaving scratches, they will effect the edge... unless you are simply not hitting the edge during stropping.
How can those particles be selective in where they leave scratches on their own??
Phil

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Hoping there is that bridge!
I miss you Buddy!
Last Edit: 1 year 1 month ago by PhilipPasteur.
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Re: Diamond Sprays 1 year 1 month ago #11871

  • KenSchwartz
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I'd have to agree. It seems like the micrographs are of excellent quality, but the honing technique is not convincing. And the concept that coarse particles have no effect on an edge simply is not accurate. If it were true, we would simply have one grit size. Am I missing something in the discussion?

I'd also agree that paper alone has abrasive properties. And that different papers have different properties, from coarse papers, to extremely fine writing papers. This is a larger topic in terms of what are suitable substrates for various grits.

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Ken
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Re: Diamond Sprays 1 year 1 month ago #11874

  • ToddSimpson
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There are a couple of observations that may help.

First, this is a straight razor edge, so there should be a single bevel of angle around 16.5 degrees.

After the Shapton 8k, the bevel is indeed 16.5 degrees and extends all the way to the apex and there is an edge width of between 100 and 200nm. There is no convexity.

After only 10 passes on the 0.25 micron diamond, the last 10 microns of the edge is convexed (or micro-convex) and a there is a thin foil edge remaining. The edge width is around 100nm where the foil is broken away.

After another 90 passes, the foil is mostly gone; however, there is little additional steel removed (compared to 10 passes). The edge width is around 50nm. The micro-convexing action occurs within a very few laps, and from there is edge shape is "stable"

The depth of the scratches is much less than the size of the grit. The 0.25 scratches are 10 or 20 nm deep. The "deep" scratch from the "large" particle shown in this image is no more than 100nm deep; however, it does not extend to the apex. I would speculate that because of the micro-convexity, the scratch ends a few microns from the apex - in other words the apex is above the plane of the bevel and the "large" particle does not touch this last few microns.


The percentage of "large" particles is not very high, so there are very few of these "deep" scratches. If large means 1 micron and deep means 100nm.
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