What a hard thing can scratch the blade?

H

Haooooo

Joined
Nov 12, 2020
Messages
41
Hello everyone, I have a very confused question. When I wipe my collection of knives with a cloth, I occasionally find new scratches on the blade. I'm surprised that I don't use them. I also try to rub the blade with something such as plastic and aluminum, but it won't cause scratches. I wonder if it's the dust in the air? Is anyone in the same situation as me?
 
Some pictures could be helpful here as well as what knives and what steel we are talking about here. If you sharpen your knife on a fixed angle system like a KME there is a possibility that the stones are coming off of the edge on the backstroke and scratching the blade face just behind the edge and you are just noticing it when you go to clean them.

In general, dust in the air is not going to be hard enough to scratch your blades so there is something else going on here.
 
Exactly what type of cloth are you using? Is the cloth clean or was/is it used for other tasks?
 
Probably grit or dirt on the cloth or blade, and yes it is hard enough to scratch it. In the case of kydex sheaths, it isn’t the kydex scratching the blade. It’s stuff that gets down in them like dirt and sand.

Almost anything will scratch up a mirror polish. Ever wiped a mirror polished blade with a paper towel or a napkin?
 
scratches ?,? lol!
orangeblue(x2) has mention
a vaild possible reason of
contaminated rag/polishing cloth.
thanks to the virus
for some of you folks
there is probably lots of used
personel surgical mask about.
repurpose the material
to wipe down metal objects now....
(i do not suggest using other folks
discards other than your own.
you may also want to soak and wash
in soap water and hang out to dry
before cutting into managable strips
or patches...)
 
ferider said:
Maybe the Kydex sheath ? It does that .... I never understood why though, the steel should be harder in theory.
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I think in this case, As others have mentioned I would blame the rag on having some grit on it? Or your wife is using them behind your back...:)

Kydex sheaths tend to be a big reason for scratches. My opinion is that is because many makers use abrasives to manufacture them and it gets some very small grit particles from sanding belts/ sandpaper stuck no matter how careful they are. That's part of the reason I know longer sand my sheaths much or at all on many of them. I saw a big diffrence in scratch reduction on sheaths I don't use abrasives on. Of course, That usually only works until you use it on something that has grit or drop it out side.;)
 
ferider said:
Maybe the Kydex sheath ? It does that .... I never understood why though, the steel should be harder in theory.
Click to expand...

c7m2p3 said:
Some pictures could be helpful here as well as what knives and what steel we are talking about here. If you sharpen your knife on a fixed angle system like a KME there is a possibility that the stones are coming off of the edge on the backstroke and scratching the blade face just behind the edge and you are just noticing it when you go to clean them.

In general, dust in the air is not going to be hard enough to scratch your blades so there is something else going on here.
Click to expand...

killgar said:
Exactly what type of cloth are you using? Is the cloth clean or was/is it used for other tasks?
Click to expand...
Hello, my knives are folding knives. They are usually placed in a box. The cloth used is CRK's knife wiping cloth and glass cloth. I also put these clothes in the box. It's strange. Usually only the blade will find scratches, but the handle such as titanium or carbon fiber does not
 
Haooooo said:
Hello, my knives are folding knives. They are usually placed in a box. The cloth used is CRK's knife wiping cloth and glass cloth. I also put these clothes in the box. It's strange. Usually only the blade will find scratches, but the handle such as titanium or carbon fiber does not
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I was referring more to what materials we are talking about insofar as softer steels would be more easily scratched. The cloth you are using has not been used to clean off a blade after sharpening? Swarf or diamond dust can be present when sharpening a blade on diamond stones which could contaminate your cloth and then be rubbed against your blade.

Conversely you could check to be sure the blade faces are not rubbing up against the liners when opening and shutting.

Another thing. Are these users or largely collectors pieces? I ask because you mention that they are placed in a box which is fine but if they are being taken out and used it is entirely possible that these scratches are occurring during use and then you are just noticing they are present when you are putting them away or cleaning them.

Lastly, have any of these been sharpened? If so on what material are they being sharpened or what system?
 
c7m2p3 said:
I was referring more to what materials we are talking about insofar as softer steels would be more easily scratched. The cloth you are using has not been used to clean off a blade after sharpening? Swarf or diamond dust can be present when sharpening a blade on diamond stones which could contaminate your cloth and then be rubbed against your blade.

Conversely you could check to be sure the blade faces are not rubbing up against the liners when opening and shutting.

Another thing. Are these users or largely collectors pieces? I ask because you mention that they are placed in a box which is fine but if they are being taken out and used it is entirely possible that these scratches are occurring during use and then you are just noticing they are present when you are putting them away or cleaning them.

Lastly, have any of these been sharpened? If so on what material are they being sharpened or what system?
Click to expand...
Hello, sir, I haven't sharp the blade, and the cloth is clean. I pay great attention to this aspect, so I have a special cloth to clean the oil on the blade and the black oil stains in places such as washer or bearings. These are different from the cloth wiped daily. Because the knives are in my personal collection and will not be used by others. I feel very strange,This kind of thing has happened to me several times. I asked my friends, They said it might be the dust in the air, so I think it's strange. Is it really possible that the dust can cause scratches on the blade?
 
Haooooo said:
Hello, sir, I haven't sharp the blade, and the cloth is clean. I pay great attention to this aspect, so I have a special cloth to clean the oil on the blade and the black oil stains in places such as washer or bearings. These are different from the cloth wiped daily. Because the knives are in my personal collection and will not be used by others. I feel very strange,This kind of thing has happened to me several times. I asked my friends, They said it might be the dust in the air, so I think it's strange. Is it really possible that the dust can cause scratches on the blade?
Click to expand...
What if the scratches were always there and you are just uncovering them by cleaning them constantly? Big brain time
 
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