CPM S90V hair whoittling.

nozh2002

nozh2002

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I just made interesting discovery. I was resharpening Microtech SOPCOM Elite CPM S90V and usually I du diamonds then Green Rouge and then 50000 mesh diaond powder, because it did not whittle hair. This time I skip Green Rouge and polish edge with 50000 mesh powder - it did not whittle hair. It make it dance - bumping on shells, but did not whittle. I decide to give it a try with Green Rouge - this make it whittle hair right away!

It seems that I did it before in wrong sequence! Seems like Green rouge has finer abrasive and CPM S90V highly populated with hard vanadium carbides need more diamond treatment then other steels before going to Green Rouge. I guess after diamonds Green Rouge will polish steel in between of carbide particles, but without them sharpened with 50000 mesh powder first it just not reaching that steel.

I need to try this on CPM S110V as well.

Thanks, Vassili.
 
That's strange my CrO2 wouldn't even work on my S90V millie, the main reason I switched to diamond paste.
 
Size of abrasive particles is what affect teeth size. Is it is 100000 Mesh diamond paste - teeth will be pretty much same as for CrO 100000 Mesh. This is why there is many different diamond pasts on the market.

Thanks, Vassili.
 
I thought I was hallucinating.Getting ready to click the go back button and Nozhs avatatar opened an eye up. I stared for a minute and it opened both eyes. Never noticed that before.
 
nozh2002 said:
Size of abrasive particles is what affect teeth size. Is it is 100000 Mesh diamond paste - teeth will be pretty much same as for CrO 100000 Mesh. This is why there is many different diamond pasts on the market.

Thanks, Vassili.
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so diamond paste can polish a blade like, if not better than green rouge?
 
Diamonds cut steel instead of polish it.
 
Its hard to explain unless you have used both products, diamond paste works faster produces a better polish and a sharper finished edge. I used chromium oxide for a long time and it always gave great results, not as good as the diamonds but once you start getting into harder more wear resistant steels the Cro either takes way to long or just doesn't work. It is also available in many different partical sizes so your options of what level of finish you want on your blade is greater. The diamond paste can also be had in a much finner grit/mesh than any other product I know of, so if you really want a fine edge you can have it.
 
knifenut1013 said:
Its hard to explain unless you have used both products, diamond paste works faster produces a better polish and a sharper finished edge. I used chromium oxide for a long time and it always gave great results, not as good as the diamonds but once you start getting into harder more wear resistant steels the Cro either takes way to long or just doesn't work. It is also available in many different partical sizes so your options of what level of finish you want on your blade is greater. The diamond paste can also be had in a much finner grit/mesh than any other product I know of, so if you really want a fine edge you can have it.
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ahhh....I think i got it....diamonds work better and faster on the harder, more wear resistant steels than chromium oxide and rouge.....and diamond paste CAN polish a blade?
 
There is no difference in diamond 100000 mesh powder and 100000 mesh CrO. I am not sure what is difference between cutting steel and polishing - to me it it is just matter of grit. Jewelers use diamond powder to polish diamonds and other gems. So this concept of cutting instead of polishing is not clear.

Diamonds is hardest abrasive and so can polish/cut anything, while ceramic (AlO) is softer then Vanadium Carbides and so can not polish/cut them in result on heavy loaded with Vanadium carbides steels they make no effect. While diamonds will work just fine.

So if abrasive particles with same size - 0.15 microns diamonds and 0.15 Cromium Oxides both harder then given steel, then result will be same.

Only problem I noticed is that sometime diamond powder have size bigger then listed. Like Green rouge turns out to be finer then 50000 diamond powder I have.

Thanks, Vassili.
 
when you look at the edge under a microscope is when you can see the difference. For a long time I used handamerican .5 micron chromium oxide and never had any problems until I bought my S90V millie, after sharpening it on my ceramics I spend 4 or 5 hours trying to polish out the edge with CrO but it was unable to remove the burr. The surface of the steel was slightly polished but the edge had a burr just the same as when I started. How do you know that the rough is finner than your diamond paste? what makes you think ceramics won't sharpen S90V? My spyderco ceramics work just fine with all steels and if I didn't have the UF ceramic I wouldn't be able to get that perfect mirror finish.
 
I tested CPM S90V edge sharpness before and after UF Ceramic and it was no difference. It is easy to check Vanadium Carbides hardness vs Aluminum Oxide. If abrasive particles bigger then carbides it does have effect but when they have same size that it stop working - like with UF.

You burr problem most likely is not related to abrasive - I think you are not hitting very edge. It should get rid of burr, but edge will not be as fine as with non abrasive steel.

Thanks, Vassili.
 
OK, have you tried feeling the edge with you thumb? I think my almost 20 years of sharpening experience says that I was hitting the edge, you cant always judge a edges sharpness by cutting thread. If you still don't believe that the spyderco ceramics won't work take a look at this thread and see for your self. It also might help you understand what I mean by cutting the steel.



http://www.bladeforums.com/forums/showthread.php?t=614192
 
knifenut1013 said:
OK, have you tried feeling the edge with you thumb? I think my almost 20 years of sharpening experience says that I was hitting the edge, you cant always judge a edges sharpness by cutting thread. If you still don't believe that the spyderco ceramics won't work take a look at this thread and see for your self. It also might help you understand what I mean by cutting the steel.



http://www.bladeforums.com/forums/showthread.php?t=614192
Click to expand...

This is not matter of believe or not I know this for sure. Ultra Fine Ceramic does not make any difference in sharpness for high abrasive steels and burr can be removed by any abrasive - it require accurate moves not super hardness because it does not formed by carbides.

And I have just few years of sharpening experience, but I have statistic sharpness test which works pretty good, but if I like to do fast test - I do not cut my thumb - I whittle free hanging hair, this works for me pretty good as well.

http://www.youtube.com/watch?v=aQPwHu4lxsQ&feature=channel_page

Thanks, Vassili.
 
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So a spyderco ceramic won't sharpen S90V but chromium oxide will? do you even read what you type?

Nice vid but only one split.
IMG_0467.jpg



I think I hit the edge
 
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