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TOPIC: Formation of Micro-Serrations - 800x

Formation of Micro-Serrations - 800x 2 years 3 weeks ago #4761

  • wickededge
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This was a fun study to do - I started with a clean slate, a very highly polished (.25um Diamond on Kangaroo Strops) edge and then created a micro-bevel with the 10k Chosera Stones with 10 edge leading strokes:

10K-Chosera-Edge.jpg


10K-Chosera-Shoulder.jpg

In this second image, you can see how smooth the surface is on the main bevel and at the shoulder of the micro-bevel.

The abrasives hit the edge and begin digging a trough, immediately creating micro-serrations and continuing the scratch all the way to the shoulder. Were the strokes done edge trailing, the same effect would occur in reverse, still resulting in micro-serrations. I'll repeat the study with edge trailing strokes soon.

Next I flattened and re-polished the bevels before repeating the same procedure with the 5k Chosera Stones:

5k-Chosera-Edge.jpg


5k-Chosera-Shoulder.jpg
--Clay Allison
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Re: Formation of Micro-Serrations - 800x 2 years 3 weeks ago #4763

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Here is the 10k Chosera again with edge-trailing strokes, both edge and shoulder:

10k-Chosera-Edge---Trailing_2012-08-24.jpg


10K-Chosera-Shoulder--Trailing_2012-08-24.jpg
--Clay Allison
Last Edit: 2 years 3 weeks ago by wickededge.
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Re: Formation of Micro-Serrations - 800x 2 years 3 weeks ago #4764

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Looking like edge trailing leaves a cleaner edge?
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Re: Formation of Micro-Serrations - 800x 2 years 3 weeks ago #4765

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cbwx34 wrote:
Looking like edge trailing leaves a cleaner edge?

So far it looks that way, at least in the finer grits. I'll post pictures of the coarser grits soon.
--Clay Allison
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Re: Formation of Micro-Serrations - 800x 2 years 3 weeks ago #4766

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Here are some shots of the edge after the 100# diamonds:
Edge-Leading

100-Leading.jpg


100-Edge-Leading.jpg

(Looking straight down on the edge)
Edge-Trailing

100-Trailing.jpg


100-Edge-Trailing.jpg

(Looking straight down on the edge)

And here is the edge of a blade at 30 degrees per side stropped on kangaroo to .25um:

30-Degrees-.25um-strops.jpg
--Clay Allison
Last Edit: 2 years 3 weeks ago by wickededge.
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Re: Formation of Micro-Serrations - 800x 2 years 3 weeks ago #4769

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wickededge wrote:

30-Degrees-.25um-strops.jpg

I'm out of superlatives. Absolutely incredible.
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Re: Formation of Micro-Serrations - 800x 2 years 3 weeks ago #4770

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Here are a few more -

First I cleaned up the edge again:

Edge-Cleaned-up-2.jpg


Then I did 10 edge-leading strokes with the 600# stones with very light pressure:

600-Edge-Leading.jpg


Next I cleaned up the edge again and then did 10 edge-trailing strokes with very light pressure:

600-Edge-Trailing.jpg
--Clay Allison
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Re: Formation of Micro-Serrations - 800x 2 years 3 weeks ago #4771

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Here is the 600# edge trailing blade looking straight down:

600-Edge-Trailing---Edge-Up.jpg
--Clay Allison
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Re: Formation of Micro-Serrations - 800x 2 years 3 weeks ago #4773

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I don't see a clear winner at the 600 level...

Love the straight down view. Pretty cool how fine an edge you can get at that level. :-)
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