06-03-2017, 10:39 PM
I’ve been doing a bunch of experiments with burr removal and I’m puzzled.
Does anyone know why some burrs are so !@#$!$’ing malleable?
I’ve had burrs that I can bend over and over and over and over… again at 45 degrees and they are extremely resistant to fracturing. They almost refuse to fracture and break off. Additionally, even thought I didn’t do it, I’m sure that if I did the same thing with the blade itself it would break after only a few bends.
The thing that is really a head scratcher is that burrs are really very thin, but they seem to have the malleability of gold and are far more malleable than the blade itself.
I was reading on the Science of Sharp website where the author was talking about stropping 300 – 500 strops on the extremely thin metal on the edge of a razor blade. 300 – 500 strops on edges only a couple of microns thick! Why is that?
I’ve had a lot of experience with stress fracturing metal. It always seems to happen when I don’t want it to. Bolts break in half, some piece of metal I’ve bent cracks or fails under normal use with what would seem to be not that much stress. Yet with a burr, when I want it to fracture and break, that extremely thin little sliver of steel is amazingly fracture resistant.
I’m guessing that something happens to the metallurgy of the steel when the burr is formed. Perhaps Mr. Jan or Mr. Mark can chime in and help explain this odd metal behavior.
Does anyone know why some burrs are so !@#$!$’ing malleable?
I’ve had burrs that I can bend over and over and over and over… again at 45 degrees and they are extremely resistant to fracturing. They almost refuse to fracture and break off. Additionally, even thought I didn’t do it, I’m sure that if I did the same thing with the blade itself it would break after only a few bends.
The thing that is really a head scratcher is that burrs are really very thin, but they seem to have the malleability of gold and are far more malleable than the blade itself.
I was reading on the Science of Sharp website where the author was talking about stropping 300 – 500 strops on the extremely thin metal on the edge of a razor blade. 300 – 500 strops on edges only a couple of microns thick! Why is that?
I’ve had a lot of experience with stress fracturing metal. It always seems to happen when I don’t want it to. Bolts break in half, some piece of metal I’ve bent cracks or fails under normal use with what would seem to be not that much stress. Yet with a burr, when I want it to fracture and break, that extremely thin little sliver of steel is amazingly fracture resistant.
I’m guessing that something happens to the metallurgy of the steel when the burr is formed. Perhaps Mr. Jan or Mr. Mark can chime in and help explain this odd metal behavior.