- Joined
- May 7, 2008
- Messages
- 93
Some interesting factoids from the Modern Marvels program last night on History Channel entitled 'World's Sharpest'. If you get a chance to watch it.. it is quite interesting.
The sharpest blade ever created was a diamond blade with an edge 5000 times thinner than a human hair
The sharpest point ever created is a tungsten point used as a probe with an electron microscope and it is 1 atom wide.
The Katana blade design (correctly done via forging and tempering) is considered the sharpest design for a knife.. simply because it has withstood the test of time more than any other blade design.
Rat's teeth are shelf sharpening. There are current ceramic outside / tungsten inside blades created that mimic the rat's teeth and are self sharpening.
Humans have been designing knives for thousands of years, nature has done so for millions. Nature has found ways for the softest of materials to slice through material that is many time harder (they illustrated grass cutting skin, and a mosquito that can bite and not be felt). Nature does this by perfecting the serrations down to the microscopic level. Piranah teeth, shark, grass, mosquitoes.. all use super tiny serations that enable soft substances to cut amazingly hard substances.
Piranah teeth are self sharpening.. and are sitting at a 45 degree angle. Piranah have super weak jaw muscles but the 45 degree angle allows them to cut through material that would otherwise not be possible.
A human hair is comprable to copper of the same size.
there was something else they said about a blade that was 10k times thinner than a human hair.. but I fogot what it was.
They also discussed about cermic blades and how something more important than edge was coeficient of drag for not creating distortion when cutting things like plastic wrap.. if there was distortion (like in a concave edge) the plastic wrap would wrinkle.. so cermic blades have much less friction. They also said it woudl be a terrible substance for a knife as it would chip off into your food... ha..
Anyway.. was quite interesting.
The sharpest blade ever created was a diamond blade with an edge 5000 times thinner than a human hair
The sharpest point ever created is a tungsten point used as a probe with an electron microscope and it is 1 atom wide.
The Katana blade design (correctly done via forging and tempering) is considered the sharpest design for a knife.. simply because it has withstood the test of time more than any other blade design.
Rat's teeth are shelf sharpening. There are current ceramic outside / tungsten inside blades created that mimic the rat's teeth and are self sharpening.
Humans have been designing knives for thousands of years, nature has done so for millions. Nature has found ways for the softest of materials to slice through material that is many time harder (they illustrated grass cutting skin, and a mosquito that can bite and not be felt). Nature does this by perfecting the serrations down to the microscopic level. Piranah teeth, shark, grass, mosquitoes.. all use super tiny serations that enable soft substances to cut amazingly hard substances.
Piranah teeth are self sharpening.. and are sitting at a 45 degree angle. Piranah have super weak jaw muscles but the 45 degree angle allows them to cut through material that would otherwise not be possible.
A human hair is comprable to copper of the same size.
there was something else they said about a blade that was 10k times thinner than a human hair.. but I fogot what it was.
They also discussed about cermic blades and how something more important than edge was coeficient of drag for not creating distortion when cutting things like plastic wrap.. if there was distortion (like in a concave edge) the plastic wrap would wrinkle.. so cermic blades have much less friction. They also said it woudl be a terrible substance for a knife as it would chip off into your food... ha..
Anyway.. was quite interesting.
They certainly don't have the sharpest sales force out there. 
