camillus usmc ww-II sharpening

[die.kriegsmarine]

Hi,
Sorry if it has been asked - couldn't find anything.

Bought off ebay camillus usmc utility knife; quite decent condition: was abused a lot. So I decided to sharpen it first. The angle of the edge was unreasonable > 50 degrees, and it did not seem to be sharpened to maintain the quality.
Spyderco sharpmaker did not give any significant results - I would say the edge has become more dull.

So I spend quite a few hours giving it new angle with a diamond stone - about 30-35 degrees. More then 40 degrees made the blade more dull to my astonishment.
After a diamond I gave it some time on a wet stone - the edge become _somehow_ shart, not though popping the hairs. I was anxious about coming home (from a campsite) and finishing up with Spyderco sharpmaker.

Guess what - spyderco has made it back dull!!! I am so very puzzled; have no idea how to proceed. My current assumption is the original secondary edge has been worn out; so now I am sharpening a primary edge, which may have a different quality.

Or the knife is a total trash and KI should retire it as a piece of history?

Appreciate any hints,
Sasha.

 

[Sword and Shield]

Try rebeveling it. Cam knives are not differentially tempered, so there is no difference between the two. Just get a coarse stone and keep on thinning.

 

[Cliff Stamp]

An old, really heavy used knife can have severely weakened metal in the edge, until this is removed it will just keep breaking away under the stone. Rods can often make this worse because they generate higher pressure. It would be helpful if you could look at the edge under magnification and see what was happening when you moved from one abrasive to another. This would also tell you directly if the actual edge itself was getting honed.

-Cliff