Where is the CATRA data for serrated edge steels?

[zhyla]

I'm convinced it all has something to do with focusing the power of your cutting effort into pressure points at the sides of the teeth, and during a slicing motion in either direction the pressure of the blade into the material increases as the material moves towards the teeth tips.

Your theory is about pressure and maybe that’s a different manifestation of what I’m about to say. But I always thought it was about leverage. When you’re pulling an SE blade in a cut the edges of the serrations are getting pulled thru the material. Essentially doing tiny push cuts. So you can apply a lot more force into the cut vs the PE blade just sliding on top of the material.

[vivi]

I'm convinced it all has something to do with focusing the power of your cutting effort into pressure points at the sides of the teeth, and during a slicing motion in either direction the pressure of the blade into the material increases as the material moves towards the teeth tips.

Your theory is about pressure and maybe that’s a different manifestation of what I’m about to say. But I always thought it was about leverage. When you’re pulling an SE blade in a cut the edges of the serrations are getting pulled thru the material. Essentially doing tiny push cuts. So you can apply a lot more force into the cut vs the PE blade just sliding on top of the material.

well said.

with a PE knife a lot of times you need to angle the blade to get the most efficient cutting action possible.

for example when I slice 5"x5"x10" blocks of cheese at work, I don't cut straight down. I angle the tip down so I initiate the cut on the corner of the block, which requires less pressure. Like a guillotine sort of.

SE do this without the user changing the angle of their cut due to the curve of the individual serrations, which makes them incredibly efficient on certain materials.

Thick poly rope is a great example.

[Red Leader]

@sal

It was great to finally meet you today - thank you so much for the coin/token. It's going to my son.

I feel like a chump though...I didn't even introduce myself and shake your hand! Next time for sure. Your thoughts were enlightening, especial regarding serrations and handle/choil designs. And how the blanks are cut. Just seeing a glimpse of what goes into a fraction of a design, was very insightful. I'll be looking into a Sharpmaker for those serrations at some point in the near future.

I'm effectively banning myself from the shop until the Seconds Sale so I don't drive the wife too crazy with all the pickups. Your team, as always, was fabulous to interface with. I'm going to appreciate and cherish the Crucible PM2 and let it continue to remind me of a very special time for the industry where Crucible really went out on a limb to support our little corner of the world, and also the critical importance of our domestic manufacturing.

[JoviAl]

I'm convinced it all has something to do with focusing the power of your cutting effort into pressure points at the sides of the teeth, and during a slicing motion in either direction the pressure of the blade into the material increases as the material moves towards the teeth tips.

A bear can cut your skin open with their claws even despite the fact that their claws are not pointy sharp like a cat, and it does it through sheer power being focused into a smaller contact area. I think serrations work in a similar way. Even sharks have serrated teeth, this is a design that's backed by millions of years of evolution.

I’ve been thinking the same thing. When I hack with SE it’s almost like I’m point on stabbing the material with loads of points and the trailing edge bites really hard behind them as they’ve anchored the cut, whereas when I hack with PE it seems to distribute the energy over a much wider surface area. Sort of like shark’s teeth vs a razor blade - they both cut stuff, but I’m recreating the impact of a bite rather than the controlled scrape of a razor through hair protruding from a surface.

[Red Leader]

I'm convinced it all has something to do with focusing the power of your cutting effort into pressure points at the sides of the teeth, and during a slicing motion in either direction the pressure of the blade into the material increases as the material moves towards the teeth tips.

A bear can cut your skin open with their claws even despite the fact that their claws are not pointy sharp like a cat, and it does it through sheer power being focused into a smaller contact area. I think serrations work in a similar way. Even sharks have serrated teeth, this is a design that's backed by millions of years of evolution.

I’ve been thinking the same thing. When I hack with SE it’s almost like I’m point on stabbing the material with loads of points and the trailing edge bites really hard behind them as they’ve anchored the cut, whereas when I hack with PE it seems to distribute the energy over a much wider surface area. Sort of like shark’s teeth vs a razor blade - they both cut stuff, but I’m recreating the impact of a bite rather than the controlled scrape of a razor through hair protruding from a surface.

Seems like it’s that whole ‘stiletto high heel tip exerts more pressure over it’s given surface area than an elephant’s foot’ example…

[Evil D]

I'm convinced it all has something to do with focusing the power of your cutting effort into pressure points at the sides of the teeth, and during a slicing motion in either direction the pressure of the blade into the material increases as the material moves towards the teeth tips.

A bear can cut your skin open with their claws even despite the fact that their claws are not pointy sharp like a cat, and it does it through sheer power being focused into a smaller contact area. I think serrations work in a similar way. Even sharks have serrated teeth, this is a design that's backed by millions of years of evolution.

I’ve been thinking the same thing. When I hack with SE it’s almost like I’m point on stabbing the material with loads of points and the trailing edge bites really hard behind them as they’ve anchored the cut, whereas when I hack with PE it seems to distribute the energy over a much wider surface area. Sort of like shark’s teeth vs a razor blade - they both cut stuff, but I’m recreating the impact of a bite rather than the controlled scrape of a razor through hair protruding from a surface.

Seems like it’s that whole ‘stiletto high heel tip exerts more pressure over it’s given surface area than an elephant’s foot’ example…

I think it results in increased pressure/leverage. I like to think of serrations as a row of smaller hawkbill blades, and we know how well a hawkbill does pull cuts.

I've also changed my opinion on larger serrations, but I still don't like sharp pointy tips, I want the tip itself to actually have an edge to it and be able to slice, but I don't have a problem with a larger circle/scallop. They may slice less well with some material than serrations like the Ayoob got but they're a lot more aggressive. I think the current Golden ground serrations are a nice compromise between these two, especially after a few sharpenings to soften and blend in the points into an edge.

[Bill1170]

One of the wonderful things about a full SE blade is that the points let me easily initiate a cut anywhere along the edge, not only at the tip. I’ve been following the machete thread with great interest, where forum member JoviAl has experimentally added serrations near the tip of a machete and is trialing it on a mix of different vegetation.