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TOPIC: Lapped and Un-lapped Micro-Fine Stones at 800x

Lapped and Un-lapped Micro-Fine Stones at 800x 2 years 1 month ago #4652

  • wickededge
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This was a really fun study to do on the Wicked Edge knife sharpener - I started by sharpening a blade to a near perfect finish using kangaroo strops and .25 micron diamond spray. Here is the edge just after the strops:

25um-kangaroo.jpg


There are a few small scratches but the bevel is very smooth overall.

Then I created a micro-bevel 5 degrees wider with a set of .6 micron Micro-Fine ceramic stones that I had not previously lapped. Here is the image:

MicroFine.6um-Unlapped-1.jpg


It's easy to see the micro-bevel and the way the metal has been grooved.

Next I used a set of .6 micron ceramic stones that I had lapped to create another micro-bevel at 4 degrees lower, so just in between the stropped edge and the unlapped micro-bevel. Here is that picture:

MicroFine.6um-Llapped-1.jpg


You can see the smooth section where the blade had been stropped, then 1 degree wider there is a small band where the lapped .6 micron ceramic stones were used and then a wider band where the unlapped .6 micron ceramics stones were used. Clearly, lapping the stones will yield a more refined edge. I'll try another experiment soon where I use each stone on the very edge. I find the ridge of metal being pushed toward the stropped portion interesting. I was using edge leading strokes, pushing into the blade and clearly pushing metal back up the bevel toward the stropped area.

You can check out the zoomed images on my here on my blog.
--Clay Allison
Last Edit: 2 years 1 month ago by wickededge.
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Re: Lapped and Un-lapped Micro-Fine Stones at 800x 2 years 1 month ago #4653

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Next, I smoothed out the bevels again in one long gentle arc from 22 degrees out to 30 degrees using the kangaroo strops and .25 micron diamond spray. Here is the progression up the bevel as I increased the angle:

Stropped-.25um-Kangaroo-on-Ridge-1.jpg


Stropped-.25um-Kangaroo-on-Ridge-2.jpg


Stropped-.25um-Kangaroo-on-Ridge-3.jpg


Stropped-.25um-Kangaroo-on-Ridge-4.jpg


to be continued... :)
--Clay Allison
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Re: Lapped and Un-lapped Micro-Fine Stones at 800x 2 years 1 month ago #4654

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as promised:

Stropped-.25um-Kangaroo-on-Ridge-5.jpg


After progressing up the angles again over the 8 degrees in 2 degree increments, I had a nice smooth bevel:

Stropped-.25um-Kangaroo-on-Ridge-6.jpg


Since I had a nice smooth curve, I figured I could do a few light strokes with the .6 micron Micro-Fine ceramic stones right in the middle of the curvature and get a great contrast between the scratches and the smooth surface:

Stropped-.25um-Kangaroo-on-Ridge-7.jpg


Stropped-.25um-Kangaroo-on-Ridge-8.jpg


This is just 5 very gentle edge-leading strokes. Again, it's easy to see the metal being pushed toward the shoulder of the bevel down in the bottom of the image.

Again, please see my blog for zoomed images. Once there, click on any image to see it in its original resolution.
--Clay Allison
Last Edit: 2 years 1 month ago by wickededge.
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Re: Lapped and Un-lapped Micro-Fine Stones at 800x 2 years 1 month ago #4655

  • BobNash
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Very cool Clay - :woohoo:
Did you lap the ceramic with the 1000 grit diamond?
Interesting to see the metal being pushed - now that I've seen it I guess I should have thought it would do that since we can push up a burr....
Some of the edges I've sharpened on the WE
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Re: Lapped and Un-lapped Micro-Fine Stones at 800x 2 years 1 month ago #4656

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I lapped them with all stones 100#-1000# and the with a 3um bench stone I have though I doubt is was necessary to go that far.
BobNash wrote:
Very cool Clay - :woohoo:
Did you lap the ceramic with the 1000 grit diamond?
Interesting to see the metal being pushed - now that I've seen it I guess I should have thought it would do that since we can push up a burr....
--Clay Allison
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Re: Lapped and Un-lapped Micro-Fine Stones at 800x 2 years 1 month ago #4657

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I also learned something about the kangaroo strops in this series (besides the fact that they ROCK!) which is that they work best when they're slightly damp. I had loaded them heavily a few blades back and they were long since dry. Powder was coming off so I decided to moisten them to make the most of the diamonds still on the leather. I used rubbing alcohol since that's what I had on my desk. The difference was dramatic; they worked much better after I sprayed them. Later, I sprayed them with some more .25um spray which worked just as well. In the past, I had thought that I needed to recharge them almost every time - I realize now that the benefit I was getting from the recharges was mostly from the moisture.
--Clay Allison
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