Lapping film

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Apr 19, 2024
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I am going to get a KME with the diamond stones. Was looking at the lapping film to go with it. Is the lapping film used like a strop to remove the burr and polish?
 
Lapping film does not cut aggressively. But is available in coarse grits, too. Depending on what kind of steel you are going to sharpen you can use it to sharpen or to polish your blades. Highest grit is 0,5 micron, as far as I know.
You can buy 60 micron or even coarser (not sure), too.
For polishing you would need to go through the progression and should use it lubricated.
 
Yes it is like a strop, but better because it has very little if any give to it, so you run less of a risk of convexing the edge. If your goal is mirror polish you should start with 9 micron and work your way up to 0.1. Diamond plates can leave really deep scratches, so make sure all the scratches from the previous grit are gone before you move onto finer. I'll typically spend a bit more time on the final stone to make sure there's no scratches left before I move onto the films. You might otherwise end up with a mirror edge but still have visible scratches here and there. I also recommend wiping the edge with isopropyl after finishing one film and moving onto another to avoid grit contamination. This of course if you want to be really thorough about it, to me that's just aesthetics, and it's not worth going through that much trouble for a blade you're gonna be running through cardboard later lol. Nearly all my knives get the 600 grit stone and 9 micron lapping then 6 micron on a regular strop and I'm good to go. Then I just maintain freehand, KME I mostly use to reprofile, I like a thinner but more aggressive or "toothy" edge on my knives, easier to maintain and bring back with a strop.
 
The tape will load with fine metal particles over time - if you have a soft eraser (back of a pencil) one can scrub the tape lightly with the eraser and it will pull up some of the metal, extending the life span somewhat.
 
Thanks. I was also looking at the strop for the Kme. What micron diamond emulsion would I need to get to be just above the 1800 grit diamond stone for touching up and burr removal?
 
Would you go with 6 or 9 micron diamond emulsion after the 1800 diamond stone? Thanks again.
 
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