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In this context, it's not about better or worse, it's different. Manufacturers come out with slightly different variations in order to cover more ground. Why they change the composition of a given model may have many causes, and mostly are concerned with business, and not necessarily how the...

Sorry to the OP for polluting the thread, but don't want to leave this question hanging. The first example is from my own research that I did a while back, when I was still working as an engineer. I did a lot of seismic reinforcement analysis, and one of the steps was the modal analysis of the...

I also agree with you, but you are only talking about vibration in general terms, namely the first vibration mode which is natural bending. However, there are many other vibration modes. Nevermind the names, I did this a while ago to illustrate how people perceive flexibility and hardness...

The theory is correct, to stop vibrations from propagating you need to have a big difference in density between materials. The resonant frequency depends on mass, if you change the mass you change the natural frequency it vibrates at. In practice, this is more of a romantic idea... There are a...

That's right, I'm proud to announce the beginning of SDC Handmade Shovels! Gardening, construction, you name it... I will build you the perfect custom shovel 😁

Thank you a lot for your words Khimmi, a big hug to you too 🙂

I've been getting a few concerned messages. Sorry, it was not my intention to worry anyone. 2023 was a very complicated year for me, a lot of work, some personal issues and health problems, so I decided to step out of social media for a while, until things returned to a more stable pace. I'm...

Precisely 😉 https://www.sdcttblades.com/materials/fibers

I won't. Here's a little reading material for you, have fun. But if you studied a bit of this like I did, you shouldn't need it. http://www.engineeringcorecourses.com/solidmechanics2/C2-bending/C2.2-composite-beams/theory/ If you agree with what I say then good, if you don't that's good too...

Yeah, it was getting late so I went to sleep, but I won't debate this much more. You didn't answer, at first at least. If you go back and edit your answer I won't know. If you don't understand the formulas then there's no point in discussing it, I'm not going to give a physics course over...

You need to re-read everything I said because I would just be saying the same thing again. Glue is not a reinforcement layer, it's a bonding layer without expressive thickness. Reinforcement fibers. You don't seem to have a grasp on what stiffness means, I would have to explain the meaning of...

How thick is the layer of epoxy? If you take a 3mm piece of cardboard and apply a 1mm coat on each side of course the stiffness will increase, but if you apply 0.05mm which is even more than a regular glued layer on a blade, it will barely have an impact. Let's stay consistent and compare...

I'm going to pull a BB here and bring out some formulas. This is how you determine the stiffness of a cantilever beam, which is an analogy to our situation: Can you tell me how you determine E and how it is important? As I said, it will depend on the glue. But if the glue in a core is...

Sorry but this is not correct. A single layer is stiffer than any of the other combinations. If all three layers are oriented vertically then the difference is negligible, but it also depends on the glue used. There is really no benefit for this type of structure unless you are using a different...

I usually refrain from putting heavy blades for sale here, there is general limit and most people consider anything above 90g too heavy. Well, that's because they only look at the weight of the blade, and not that little last piece of information I give which is the balance. Most commercial...

Good, then you got it 😉. But it's not "a" dragon, it's "the" dragon.

This was supposed to be a custom order, my dumb self still believes in the honesty of people, but sometimes it doesn't turn out that way. But no harm done, just used an handle design of my choice and here it is. Originally I was asked for a very soft feeling, so despite having ZLC on the Bh side...

Recently I got my hands on this beautiful "fish scale" Koto and this is the first time using it. This pattern happens when wood is cut at a certain angle and it exposes the medullary rays, which are perpendicular to the growth rigs. Not all wood species have them, and they can be hard to find...

A slow outer fiber blade, direct Koto feeling and tamed vibrations but on a lower speed class than usual. Available FS. - Koto / Innegra / Ayous / Kiri / Ayous / Innegra / Koto - 87.4g - 6.0mm - 157x150mm - AN (100x24.0mm) - 1120Hz - Balance: 2.8cm (Low)

I've tried this HL5 style composition with almost every type of AC weave in my arsenal, AC-I was the only one left. Compared to regular AC-# it feels slightly stiffer, slightly softer, a little more Bh oriented. Available FS. - Limba / Ayous / AC-I / Ayous / AC-I / Ayous / Limba - 88.8g -...