ok let’s say I buy a used knife that the previous owner sharpened At a higher angle then the factory at lets say 25 dps. I then get the knife and want to sharpen it back to what it was when it left the factory. I’m curious how much material is being lost when I decide to do this and how material is lost when you decide to Sharpen a knife at a higher angle then it is? I’m thinking if I want to sharpen a knife at a lower angle the only material I will remove will be behind the apex since I’m basically just thinning the edge out. I wish I had pictures to show exactly what I’m talking about.
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Sharpening question
- Thread starter Gradyw
- Start date
That is exactly what I’m talking about. Did you find that or make it? And on a one inch blade, edge to spine, how much of a difference is that anyway? 1/16 or 1/8 or not even close to that much.You mean something like this?
I’m asking because I don’t want to buy a used knife and be missing an eighth inch from edge to spine. Maybe I’m weird but I’m anal about that kind of shit lol
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- Nov 19, 2014
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It is hard to say.
That model was based on the assumption that one can stop exactly when a sharpening stone hits the apex without grinding much materials away from the apex.
In your case, you don't know how much material the first sharpening to 25 DPS removed by the owner. Maybe he or she made huge burrs on each stone. Who knows.
Also, the thickness behind the edge has to be accounted. If you can guess the thickness behind the edge and the factory angle, I can calculate the magnitude of shortening from the original based on the assumption above. It should be proportional to the edge thickness.
You could sharpen it to 18 DPS, for example, without loosing a lot of materials, though.
That model was based on the assumption that one can stop exactly when a sharpening stone hits the apex without grinding much materials away from the apex.
In your case, you don't know how much material the first sharpening to 25 DPS removed by the owner. Maybe he or she made huge burrs on each stone. Who knows.
Also, the thickness behind the edge has to be accounted. If you can guess the thickness behind the edge and the factory angle, I can calculate the magnitude of shortening from the original based on the assumption above. It should be proportional to the edge thickness.
You could sharpen it to 18 DPS, for example, without loosing a lot of materials, though.
- Joined
- Nov 19, 2014
- Messages
- 2,633
Basically, the height difference depicted in the second illustration from the left is approximately (for 18 DPS to 25 DPS),
Height difference= 0.5 x Edge Thickness x (Tan72° - Tan65°)≈ 0.5 x Edge Thickness x ~1= 0.5 x Edge Thickness.
So it would have lost about a half the thickness behind the edge, if the burr management was good at the first reprofiling from 18 to 25 DPS.
Height difference= 0.5 x Edge Thickness x (Tan72° - Tan65°)≈ 0.5 x Edge Thickness x ~1= 0.5 x Edge Thickness.
So it would have lost about a half the thickness behind the edge, if the burr management was good at the first reprofiling from 18 to 25 DPS.
0.5 of what and would you be worried about it or am i thinking ab it way too much
