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Knife Sharpener = Best Lapping Tool? - Page 2

post #11 of 25
A wetstone/sharpener is designed to sharpen, not to mill and polish.

The best "lapping" tool is called a vertical milling machine and a surfacing table. Unfortunately theyre not easy things to access or use for most people.

You could find machine shops that could do it for you though.
post #12 of 25
Thread Starter 
Quote:
Originally Posted by Epitope;12734351 
The tools pictured in the OP are hones, not sharpeners. Just sayin... There is a difference.
"What is the difference between honing and sharpening? When a typical knife is sharpened, it has tiny microscopic teeth all along the cutting edge. When the knife is used, the teeth and edge gradually flatten out. A honing steel, which looks like a short sword with a round blade, is used to draw those teeth and the metal of the cutting edge back into shape so the edge is keen. The honing steel is not designed to remove metal. If used aggressively, it will do that, but that is not its primary function. A good steel is magnetized to help in drawing the cutting edge back into shape.
Sharpening is removing metal from the cutting edge to remake the edge. The most common sharpening device used to be a whetstone. Now diamond and ceramic rods are available and widely used."
From:http://www.cookswares.com/discussions/honing.asp

That's what I meant. Knife honer, thanks.
I just applied some pressure and copper comes off in fine powder.
Quote:
Originally Posted by Kal777;12734196 
How could you use a knife sharpener and get a completely flat resault, if you really have used on of those knife sharpeners you have prob screwed your heatsink base

Just try it on a coin/piece of metal or old heatsink or something if you don't believe me. I tried it on one of those uneven HDT heatsinks and it polished it down very nicely.
post #13 of 25
Lapping? LOL! That's so aughts!
    
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post #14 of 25
rolleyes.gif
    
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post #15 of 25
Whatever, I always do my lapping with a hammer and chisel. Mirror finish every time.
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post #16 of 25
Thread Starter 
Here is my result with a copper penny (pre-1982):
cimg0814.jpg


The bottom part is with my knife honer (I was holding on to the top part of the penny to polish it). I tried sandpaper on the top portion and it seems a bit rougher.


The indentation is a part of Lincoln's neck area that I haven't filed down yet.

So if you're not getting similar results, I either have bad sand paper or I have a very good honer. (I got my sand paper from a CPU/GPU-shim seller)
post #17 of 25
Roughness is not the issue, flatness is. You can have a near perfectly flat surface that does not have a mirror finish. You can also have a surface that is nowhere near flat yet has a mirror like shine to it.

Flatness is what matters, not surface finish.

Post a picture of a razor blade or some other straight edge against the surface of your CPU (or that penny). Even better, put a bright light behind the straight edge and CPU to really show that the lapped surface is completely flat.
    
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post #18 of 25
Quote:
Originally Posted by Epitope;12735180 
Roughness is not the issue, flatness is. You can have a near perfectly flat surface that does not have a mirror finish. You can also have a surface that is nowhere near flat yet has a mirror like shine to it.

Flatness is what matters, not surface finish.

Post a picture of a razor blade or some other straight edge against the surface of your CPU (or that penny). Even better, put a bright light behind the straight edge and CPU to really show that the lapped surface is completely flat.

This.
    
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post #19 of 25
Hang on, he might be onto something. I bought a very expensive triple oil stone a few years ago for my stepfather. Working in fine dining as a kid, i learned how to sharpen knives properly and with this stone. I have an old H50 i can test on, prolly tomorrow.

[ame]http://www.youtube.com/watch?v=EXp5fxCoNnA[/ame]
    
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post #20 of 25
Quote:
Originally Posted by Epitope;12735180 
Roughness is not the issue, flatness is. You can have a near perfectly flat surface that does not have a mirror finish. You can also have a surface that is nowhere near flat yet has a mirror like shine to it.

Flatness is what matters, not surface finish.

Post a picture of a razor blade or some other straight edge against the surface of your CPU (or that penny). Even better, put a bright light behind the straight edge and CPU to really show that the lapped surface is completely flat.

Totally this
    
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