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Proteus Technology: New Material Is Strong, Light and Non-Cuttable

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Re: Proteus Technology: New Material Is Strong, Light and Non-Cuttable

#241

Post by blackrock »

brian_cunnie wrote: post #69
walrus01 wrote: post #47

Earlier quoted context omitted.

In any major city really the solution is to never lock anything up in public that is worth more than $400 or so. I have two road bikes, the insurance replacement value of each would probably be $3000, and I wouldn't even dream of buying a lock. I literally don't even know where my lock is. The last time I saw a lock was when I put it in a box of stuff on a shelf in my garage 10+ years ago. If you have a nice road bik…

I've managed to keep my bike locked up outside OVERNIGHT in San Francisco (Washington & Polk St.) for a year now. How I did it? The short version: one very good lock (Viro Euromonolith + Peewag security chain, $175), a second good lock (kryptonite, $90), and an okay lock (Abus, to keep them from stealing the basket, $60). I've also had 3 bikes stolen, the rear wheel stolen, the basket stolen, the front brake stolen,…

Geez, they stole your front brake? What the hell are they going to do with it?

What is the cost of it? A few bucks? I can’t even be bothered to sell my used crap on eBay.

Re: Proteus Technology: New Material Is Strong, Light and Non-Cuttable

#242

Post by dang »

frequentnapper wrote: post #238
dang wrote: post #236

Earlier quoted context omitted.

" Eschew flamebait. Don't introduce flamewar topics unless you have something genuinely new to say. Avoid unrelated controversies and generic tangents. " https://news.ycombinator.com/newsguidelines.html

Thanks dang, I understand and appreciate you pointing this out. However, I would say the original flamebait and a tangent was mention and praise of a person who has committed well documented genocide. So I don't see why my comment is the only one being flagged for pointing this out.

Partly it's a judgment call. I would say that bringing Churchill into a thread about English writing style (which was already off topic, but not a flamewar) does not count as flamebait, while bringing in genocide does. I can see how someone would argue it the other way.

Mostly, though, it's a matter of the effect on the thread. The value of a comment is the expected value of the subthread it spawns [1]. In this particular community a "Churchill+genocide" comment is pretty well guaranteed to spawn a flamewar, which was not true of the subthread one level up. So it's relative to the community you're participating in.

[1] https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...

Re: Proteus Technology: New Material Is Strong, Light and Non-Cuttable

#243

Post by dgoldstein0 »

throwaway9d0291 wrote: post #169
db48x wrote: post #68

Earlier quoted context omitted.

This material is completely unsuited for making shoe soles or elbow pads; it's a two-inch-thick plate of aluminum foam with half-inch ceramic spheres embedded in it. Around that they welded steel plates to give it a uniform surface. It'd make a very heavy but uncuttable door, but you can't make hinges or locks out of it. It would be a good material to make safes out of; those already have thick walls of composite mat…

I think that's a premature judgement. Is there any reason to think that it's impossible to scale it down? e.g. for PPE, 5mm ceramic spheres in a 1cm-thick Aluminimum foam with some 1mm steel plates on either side?

For comparison I was learning about medieval armor recently. Steel breastplates are about 2mm at their thickest, typically. So that's a rather heavy duty armor idea you have.

Real question then is how it would fare against bullets and piercing attacks. Cutting is only one possible threat, and usually not the biggest threat. Knife resistant bullet proof vest are already a thing, so how would this be better?

Re: Proteus Technology: New Material Is Strong, Light and Non-Cuttable

#244

Post by walrus01 »

blackrock wrote: post #241
brian_cunnie wrote: post #69

Earlier quoted context omitted.

I've managed to keep my bike locked up outside OVERNIGHT in San Francisco (Washington & Polk St.) for a year now. How I did it? The short version: one very good lock (Viro Euromonolith + Peewag security chain, $175), a second good lock (kryptonite, $90), and an okay lock (Abus, to keep them from stealing the basket, $60). I've also had 3 bikes stolen, the rear wheel stolen, the basket stolen, the front brake stolen,…

Geez, they stole your front brake? What the hell are they going to do with it? What is the cost of it? A few bucks? I can’t even be bothered to sell my used crap on eBay.

A stolen front v brake / rim brake? They're going to trade it along with a few other choice bike parts they've collected for $15 worth of meth, crack or synthetic opiates.

Re: Proteus Technology: New Material Is Strong, Light and Non-Cuttable

#245

Post by bagacrap »

Godel_unicode wrote: post #58
walrus01 wrote: post #47

Earlier quoted context omitted.

In any major city really the solution is to never lock anything up in public that is worth more than $400 or so. I have two road bikes, the insurance replacement value of each would probably be $3000, and I wouldn't even dream of buying a lock. I literally don't even know where my lock is. The last time I saw a lock was when I put it in a box of stuff on a shelf in my garage 10+ years ago. If you have a nice road bik…

We definitely mind, we're just too polite to tell you. Knowing your friend spends thousands (plural) on their bike makes you feel bad about not wanting their "clean" tires, which definitely didn't roll through dog turds and cat pee on the way there, on your floors.

yeah I definitely don't ride my bike through dog turds, and if I did you'd find evidence on my shoes before my tires (from which it would have already been rubbed off)

Re: Proteus Technology: New Material Is Strong, Light and Non-Cuttable

#247

Post by rkagerer »

Jedd wrote: post #44

> The freefall of grapefruit from 10 m does not damage the pulp[1] because pomelo peel consists of vascular bundles and an open-pored cellular structure with the struts made of parenchymatic cells. I have a Marsh grapefruit tree, fruiting now (southern hemisphere) as it happens, and I note that it produces particularly pithy progeny. (Ignoring for the moment that Pomelo is one of the parents of the modern grapefruit.…

Gotta love HN; I click comments and am met with screenfulls about grapefruit.

Re: Proteus Technology: New Material Is Strong, Light and Non-Cuttable

#248

Post by IshKebab »

SV_BubbleTime wrote: post #219
IshKebab wrote: post #199

Earlier quoted context omitted.

Why? Bike locks are surely the most common thing people have experience of being cut that they don't want to be cut.

Did anyone actually read the article? The aluminum foam material has to be thick and the ceramic beads are large. Also, even if you just looked at the angle grinder video, you can see the claims aren’t really as presented. It’s very cutable, it just happens to eventually dull the cutter eventually. That’s what, a 2” billet they have there? For their demo on a similar thickness steel plate, I think that most people wo…

Yes I did watch the video, and yes I agree it would be fairly useless for bike locks. Though there is a very expensive bike lock that has an aluminium surround the try to foil small angle grinders (the idea is that it is too thick for the discs to get through). Would be useful for that.
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