Look at the Grinding Noise!

I have been contacted by my previous employer, which has led me to remember the various works I used to do. One of which was measuring and evaluating noise. That has meant that I was making and interpreting pictures like this.

© Charly, all rights reserved. Click for full size.

Of course, this was only done with my phone, whereas at the laboratory I had various kinds of fancy equipment and software available. But back then I did in fact check whether this phone app measures reasonably accurately, and it does.

At the very top, you can see that grinding handles is a very noisy work indeed. When the equipment runs idle, it emits over 78 dB, which is very near to a level when the noise becomes truly dangerous (80 dB). And during work, it exceeds 89 dB. So I am indeed diligent about wearing hearing protection since that noise level would damage my hearing pretty damn fast.

Whoever knows how to interpret the above picture, can tell that when the grinder runs idly (those parts with green at the top), most of the noise – and indeed the loudest noise – is below 500 Hz. And whenever the wood touches the belt, another very loud component is added, between 5 and 80 18kHz (those parts with red-magenta stripes at the top). There is nothing I can do about the noise that is emitted during the grinding, but I could if I were inclined to spend my time on it, try and identify the spots where the loudest frequencies are during idling and try to do something about that. For example, I suspect that a significant source of the low-frequency loud noise is the tensioning wheel.

However, as much fun as it might be, I do not think I will spend a lot of time over this anytime soon. It would be fun though. I liked my previous job, the work was not the reason why I quit.

The Myth of Self Defence

I wanted to write this for some time, but it was Marcus’s recent post that prompted me to finally do so. It will probably be a bit rambly, I am not Shakespeare after all.

As is not unexpected for someone who was really badly bullied in my childhood and even in high school, I have dabbled in martial arts a bit in an attempt to learn how to defend myself from bullies. It started with a bit of karate, then a bit of aikido, and then I gave it a pass because I have come to the conclusion that it is mostly useless and way too much effort for way too little gain. I still have some interest in them, purely theoretical, so I do occasionally watch youtube videos about martial arts and self-defense. And they have more or less confirmed this belief.

You see, in order for any martial art to be any practical use whatsoever against a dedicated – even untrained – attacker, one has to spend an inordinate amount training them and keep oneself in good physical shape. And even then, in an actual confrontation, there still would always be a huge luck factor that can completely do you in and that is a fuckt. Especially when weapons get involved. Any weapons.

I am glad to live in a civilized country that regulates weapons sensibly, not too little like the US, but also not to a ridiculous degree like UK or Japan, or AUS, so I have never encountered the level of threat that Marcus is describing. I have also successfully avoided the military draft, thus I have never had the dubious pleasure of encountering a loaded weapon of war by having to handle one, let alone to be in the presence of a maniac handling one. The closest I got to a firearm was when I was a kid and could shoot a varmint rifle for one day and that was it. I never needed a gun, never was threatened with one either. The only violence that I was threatened with was a physical altercation that would, at its worst, probably result in a black eye and perhaps a concussion. Not that those are pleasant, but this level of risk does actually allow one to employ the best self-defense there is – running away.

Occasionally when I mention this in comments on YouTube, someone answers that that is a great way to get shot or stabbed in the back, which always makes me LOL. Being shot is not a great risk around here. It is not zero, but it is not on anyone’s radar. Even a mugging is most likely to involve at worst knives. And getting stabbed in the back while one runs away is just ridiculous, try to sprint and stab a target that moves at the same speed away from you if you do not believe me.

One of the self-defense and martial arts YouTube channels that I occasionally have watched in the past, hard2hurt, has made a whole video criticizing the strategy “run away whenever you can” which I have considered completely ridiculous. AFAIR, his main argument was that it is not easy for an untrained person to outrun an assailant. Well, duh? However, the untrained person still has better chances to outrun him than to subdue him in a fight, since there are fewer variables involved. And if you train martial arts, you are most likely fit enough for running faster than Joe Schmo too.

If you find yourself in a dangerous situation, do your best to de-escalate and/or comply (hand over the valuables). If that fails, do your best to get away. If, and only if, that fails, is the time to fight – and at that point, you have probably lost anyway because you were caught unawares and were harmed before you could actually do any of the previous steps anyway.

That’s not to say martial arts are completely useless. They can be a great exercise if you have a body that benefits from one (I don’t). Visiting a martial arts club can also be a great opportunity to meet with people and make friends. Some people do enjoy competitions and that is fine too. Some people like all of those things and some more and that is just dandy. But any student of martial arts should not kid themselves that what they are doing is learning how to be invincible in a confrontation. And any responsible sensei should and would drill into their students that avoidance of confrontation is far superior to martial arts mastery.

All that said, I have used my minuscule martial arts skill a few times in my life, from that twice to get out of an assailants’ grasp and get away from the confrontation. If I were trying to “stand my ground and teach them a lesson” I might have won, but I also might lose. I would definitively suffer some damage. By running away I may not have “won” in the macho sense of the word, but I also suffered no damage, which is a win for me. But a bit of knowledge of martial arts did allow me to run away in the first place.

Last I would like to say that MMA is in this context just a useless as all the other “traditional” martial arts. In my opinion, in most cases, the useful parts of all martial arts are not the subjugation levers, armbars, chokeholds, kicks, and punches.  Outside of the controlled and rules-governed ring, those are useful to the assailant, not to the defendant. To the defendant are useful other things – the dodges, pressure points, evasions, safe falls, and, above all, being in good enough shape to run for it. And getting those is possible even in martial arts that are not well suited for competitive fighting.

I Made a Shoe Rack

I took a break from making knives and the last three days I have spent testing my new circular saw by the means of making something with it. My mother has requested a small shoe rack that would fit between a wall, an open bedroom door, and a washing machine. That meant the rack has to have a bit funny shape, as you can see.

© Charly, all rights reserved. Click for full size.

It was made mostly from recycled materials. All the shelves and the sides are made from old kitchen cabinet doors. The sides are covered with adhesive wallpaper and the tops of the shelves themselves are covered with pieces of PVC flooring leftovers from house renovations. The upper one has a different color in the photo due to additional light from the window, they are all the same IRL.

Doing this kind of work with my new table saw was a joy, but the saw has one design feature that I think is done extremely poorly in comparison to my previous one (and in fact even in comparison with my home-built belt grinder and tumbler) – the design of the on/off switch. The old one had an extra emergency switch that could be easily pressed with an open palm, or a knee or whatever body part is near. This one only has an elevated red off button that is not very big and not readily accessible, it requires a bit of fumbling about under the table edge to find and a firm and relatively precise push is needed. I must say that as much as I love the tool, this particular feature would earn the designing engineer a clip around the earhole from me because it is very, very daftaroony. Everything else – the dust collection exhaust, the folding legs, the extendable table supports, the adjustable cut depth/angle works very well and easily, the ergonomy of all those parts is great. But for that bloody daft on/off switch alone, I would take it one and a half star out of five if I were writing an official review. A beast of a machine like this just must have an emergency off-switch that even a panic-stricken and/or injured person can immediately find.

I may be overly strict in my expectations, but this one is a real bummer for me. If it did not violate the warranty, I would change it for something more suitable straight away. I might build something with an extension cable that would allow me to have an easily accessible emergency switch without compromising the integrity of the machine.

TNET 46: In a Highlander’s Shoes

I do not know why the algorithm recommended the Fandabidozis channel to me, but it did. I think (although I am not sure) that it first recommended one of the videos in which he shows the crafting of some of his historically accurate-ish equipment.

I have enjoyed his videos in which he explores 17th-century equipment of the Scottish highlanders and this one is probably his biggest and best video project.

Open thread, you can talk whatever you want, just do not be an a-hole.

Previous thread -click-.

Accidentally Tacticool?

I have designed this knife with a focus on ease of manufacture. It is meant to be a simple design that would allow me to utilize micarta made when impregnating wooden handles with epoxy. The metal bolsters are not exactly easy to make, but micarta would allow me to forgo them completely if I ever decide to do so. I do not like knives without bolsters, thou.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

The ornamental pins came out more asymmetrical than I hoped for, I will have to use another method to get them more consistent. And the black micarta, made from old jeans, looks tacticool, which is not entirely intended. The knife is a small outdoor knife, suitable for example for mushroom picking. In fact, my father immediately said it would be a knife ideal for mushroom picking upon seeing it, which made me happy because that was my intent.

Then I have also made a badger knife with a handle from micarta. But this time it was not micarta made from stacked layers of fabric but from smaller cuts of different colors crumpled together in the resin.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

It is hard to take a photo of, but the crumpled fabric does give the micarta a black&grey camo look, which is again more tacticool than I intended. I will probably start making micarta with bright colors because those are more suitable for a forest walk IMO – if you lose them, you have better chances of finding them than these. Although the stainless steel would, of course, gleam like a naked bum amongst the undergrowth.

I will probably furnish both of these with simple black sheaths. These knives are meant to be simple.

So… What Are Tomatoes? Exactly?

It looks like vegetables are pretty bigoted antitomatists.

Butbutbut… Aubergines, peppers, gherkins, chillis, cucumbers, and zucchinis are fruits too if one insists on being pedantic!

Poor tomato, its tribulations did not end there. Fruits are prejudiced against it too…

Truth be told, I would definitively not put tomatoes in fruit salad, the technicality of their status notwithstanding. Unless cucumber & tomatoes salad is fruit salad? Then again, cucumber got into both parties without a problem. I is offishully confused.

Serious problems of serious times.

Frosty Morning Walk – Part 6 – Frosty Leaves

And one cobweb. Frost is very beautiful. It would be more beautiful if it were pleasantly warm, but one cannot have everything.

© avalus, all rights reserved. Click for full size.

© avalus, all rights reserved. Click for full size.

© avalus, all rights reserved. Click for full size.

© avalus, all rights reserved. Click for full size.

© avalus, all rights reserved. Click for full size.

An Experimental Kitchen Knives Set

This set is numbered, but I won’t be selling it. I have tried several new things whilst making it and it was designed in part with a focus on ease of manufacture, except the experimental dimples in the blades.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

The stand is made from three slabs of massive black locust wood and the front of the knife stand, the bolsters, and the end caps on knife handles are made from a coconut shell. Fitting the curved coconut shell perfectly to a piece of wood is of course not possible, and I have solved that problem quite successfully by dyeing the epoxy glue dark brown.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

The finish is simply drying oil (commercial “Teak oil” which is a mixture of various oils) applied in several layers daily for over a week. It is still a bit tacky to the touch, but that should solve itself in time and with use. The surfaces are not overly polished – I did not go above 330 grit for both the metal and the wooden parts. Black locust wood has big pores in its growth rings, so polishing it very highly makes little sense anyway. I have, in fact, brushed the wood with a steel brush to accentuate the pores.

© Charly, all rights reserved. Click for full size.

I tried to make divots in the blades to make them less sticky to food, but it did not work out, they have too small a diameter to have any noticeable effect (I think). I will either have to build a tool to make these divots wider or to make very shallow fullers reliably and reproducibly. Neither of those two tasks is easy and I do not currently have any ideas.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

The handles are not of an overly complicated shape, they have simply hexagonal profiles with some curvature to the facets and smoothed edges. They are reasonably easy to make and comfortable in the hand. The tang is held not only with glue but also with a nut on the end, which is covered by the coconut shell endcap.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

© Charly, all rights reserved. Click for full size.

I think these three knives should cover just about any task that an ordinary home cook needs to do in their kitchen. I hope. I have given the set now to my mother to test and I have forbidden her to use any other knife for the time being under the serious threat of confiscating her other knives. She has got instructions to use and abuse them to test them thoroughly. If they pass the test, I will make multiple sets (without the divots in the blades) for sale.

I have also been thinking of adding this kind of picture in the future to my blades when I offer them for sale on the interwebs, to save myself the trouble of having to write the sizes in words for each piece. What do you think about that idea?

© Charly, all rights reserved. Click for full size.

 

One Santoku, Two Santoku, Three Santoku…

Today was finishing day – I finished six knives, three of which are Japanese-style santoku kitchen knives.

Three santoku knives. © Charly, all rights reserved. Click for full size

Japanese knives are not my forte. I know a bit about them, but not much. I do not intend to make them in significant numbers. Not only because I am not Japanese, but also because some of them are highly specialized tools optimized for one specific task and most people here in Europe would have no clue whatsoever how to use them or care for them and those who do would probably prefer to buy them from actual Japanese craftsmen. But I had three offcuts that just lent themselves for this type of blade and I am all for making the most with the least amount of waste.

Where I (afaik) differ most significantly from Japanese blades is the round-heeled ricasso. And the knives are glued together with epoxy.

Olive wood handle. © Charly, all rights reserved. Click for full size.

This one has a handle from olive wood, cow bone, and buffalo horn. The handle is asymmetrical – the bone piece is not flat but rounded. Fitting the wood, bone, and horn together was thus a bit of work, but I have managed to fit them together fairly well, albeit not perfectly. The handle has a D profile, with a flat-ish top and rounded belly.

Olive wood is extremely beautiful and I should have probably saved the piece for a worthier blade. But it stinks to the heavens when worked and is somewhat greasy so it tends to clog up abrasives something awful. Due to the greasiness of the wood, I have finished the handle with tung oil, five layers over two weeks. And when I was at it, I used the same finish for the other two as well.

Santos mahogany handle. © Charly, all rights reserved. Click for full size.

This is just a simple two-piece handle, bone bolster, and Santos mahogany wood. This wood works reasonably well and is very dry, the exact opposite of Olive. It does not gum up the tools, but it makes a lot of dust that likes to float around. I think it is a neat knife. The handle has a rounded belly and a faceted back.

Cherry handle. © Charly, all rights reserved. Click for full size.

And last a knife with a handle from my late cherry tree, cow bone, and buffalo horn. The handle is faceted, probably the closest to a true Japanese-style knife.

They are all 160-170 mm long blades, with handles 110-130 mm. I am not planning to make more unless I get suitable offcuts again.,

I Think This Will Cut It

My new circular table saw arrived today. I haven’t got round to using it yet, for I had some time-sensitive work to do in the garden, but tomorrow I am definitely going to use it because I have bought a small bedside table that needs some modifications to fit into my living room properly.

© Charly, all rights reserved. Click for full size.

It is not the most prestigious and expensive tool imaginable, but it was fairly expensive so I really, really, really hope it works well. I was putting off this purchase for as long as I could, but I needed a proper table saw for a long time by now. This one seems to be sturdy, the table is nice and flat and it has built-in extension support and various end-stops, as well as grooves for cutting jigs.

© Charly, all rights reserved. Click for full size.

It can cut up to 87 mm depth, which is nearly double what I was able to cut with my previous setup. And of course, setting of cutting depth and angle is much more convenient with no fiddling under the table and cursing the whole time because I cannot get the depth and/or angle right. It is powerful but can still be connected to my shop vacuum (it has 2000 W usage, which is near the maximum), so I do not need to plug it separately and turn on two devices for each cut or have the vacuum run continuously – the vacuum will start automatically with the saw when the saw is plugged into it.

© Charly, all rights reserved. Click for full size.

And the thing that makes me most happy so far – the legs can be folded and it can be stowed away under my workbench in the same place where my previous saw was residing. Hooray! I need not do any big changes to the Shoppe!