dog nougat posted:

This totally safe looking thing is available on Wish!!

chitoryu12 posted:

Having brought up Canada's Worst Driver before, they had an Eye of the Needle challenge specifically about this. You were going at 80 km/h and had to pass through 5 arches, each only slightly larger than the car. By looking where you want to go, you'll subconsciously bring the car where it needs to be. This is vital for crash avoidance because it allows you to swerve and avoid debris or another car instead of slamming on the brakes or blindly staring at it and crashing into it. A few people have written to the show saying the lessons from it saved their life.

https://www.youtube.com/watch?v=k0qfTPmJn-I&t=1775s

vortmax posted:

Do you have full coverage or something that covers you breaking your own window? Because I'm pretty sure my liability-only-plus-uninsured-and-underinsured-motorist-coverage won't pay to replace a window if I break it.

Mr. Nice! posted:

The 3000 mile oil change is an anachronism that dates back to garbage us cars built in the 70s and 80s. Everything built in the last 10-20 years or so has a service interval of 5-10k that I've seen.

Also, the windshield thing depends on the state. In Florida, every auto policy must fix windshield chips and cracks free of deductible. So you don't see cracked windows often unless the car is a $500 beater that barely runs anyways. its different elsewhere.

Traxis posted:

https://twitter.com/CharlesRobinson/status/1289702938017923072?s=20

Icon Of Sin posted:

Does anyone want to make their own safety signs?


https://observatory.db.erau.edu/generators/signs/

Drone_Fragger posted:

Oh no, it’s me, I’m the OSHA. I was doing some testing on drilling into a PE pipe with a hole saw and the hole saw snagged resulting in the power drill I was using spinning round and smacking me square in the orbital bone at full torque. Now I have a nice face egg. I’ll get a photo when it’s actually bruising in fabulous technicolour.

Powershift posted:

e: video of the incident.

https://twitter.com/IndyCaronNBC/status/1297604321811607553

xylo posted:

don't mind me I'm just filling up

Uthor posted:

For some reason, using a hook seems nuts to me, though I don't see how a bolted joint would be a better solution.

I'd at least add a safety line like the one in my garage that catches the springs if the connectors break.

Humphreys posted:

Because of the greater sigma of WRX owners being insufferable?

Memento posted:

The noise this thing makes at 0:32 is terrifying.

https://www.youtube.com/watch?v=yLLG2_ErvJs&t=27s

Thomamelas posted:

Other critics have more reasonable complaints.

Scratch Monkey posted:

To visualize this

F-35 vs F-15X





SAMs are a lot better than they used to be so being able to get rid of them so that much bigger, less survivable planes can dump precision guided bombs without being shot down immediately is very important.

Ixian posted:

In a world where the only major combatants who can field air forces that matter still have lots of ICBMs with nukes the F-35 doesn't really matter for poo poo.

Methylethylaldehyde posted:

Oh god no, a 5th gen fighter will have the RCS like between 10% and 0.1% a fully kitted out F-15. The super low frequency radar that can at least SEE the stupid thing vs the higher frequency stuff, but that's the difference between 'that spherical cow from physics class' with an RCS of like 2, and 'a pigeon fart at 40 miles' with the RCS of three grains of rice.

Whereas the F-15 has an RCS of like 45 m^2, and can be seen from space.

EvenWorseOpinions posted:

I use EM radiation all the time at work so I'm pretty familiar with some frequency bands at least. I got an opportunity to view the f35 through the 380nm to 740nm band and it wasn't obscured at all.

mlmp08 posted:

There are a pile of threads where this is better covered, such as the cold war / airpower thread.

Karia posted:

This is already a product. McMaster's got changeable face hammers, sledges, or deadblows.

There's also similar changeable tips for tap-testing hammers, which have piezoelectric transducers to record the force of impact. We use them to measure vibration response: hit a part and record its motion using an accelerometer/capacitance probe/vibrometer/whatever, and you can compute the frequency response based on the motion and the input force. Changing tips gives different responses: a harder tip applies more energy over a wider bandwidth, so if you want to get high frequencies you generally use the harder tips, but you also run the risk of damaging your part. High-performance machining: we hit things with hammers!

wesleywillis posted:

What if you 3d printed a CNC machine and then used it to make 3d printers?

Sagebrush posted:

CNC machining won't be fully replaced by 3D printing

LifeSunDeath posted:

Jabor posted:

one curious fact, that you might or might not find interesting, is that the people most cynical about it are the people that actually know how it (and the industry that produced it) works.

while the people most in favour of it are people that see it as a magical black box that solves their problems.

just something to think about.

Sanctum posted:

Agreed on both counts. I think SpaceX is cool and good and hope they succeed. Elon Musk is terrible and I hope he fails. He's failed his weird underage marriage so that's all v. good.

Speaking of rockets, I love this hour long episode about a tour of a modern rocket factory. My favorite part was how the CEO explained why they were manufacturing rocket hulls using orthogrids instead of the older isogrids. He explains why they prefer orthogrids because they are lighter, stronger, and much, much easier to machine. Some wizards in the 60's punched in a question for a computer without stopping to think about how assembly performs logic. The primitive series of BJT transistors gave them the answer known as the isogrid rocket hull. Decades of rocket scientists never bothered to math why this was supposedly the mathematically ideal rocket hull design. The isogrid was not an ideal rocket hull design.



Here's an isogrid by the way. Triangles, laughable.


Orthogrid. Literally just squares, that's it.

Dirk the Average posted:

This. It's the sort of thing that any engineer will do as part of their coursework. [...] Also, calculating the strength of a design like that is relatively trivial as far as FEA goes.

Platystemon posted:

CarForumsPoster, you almost [...]

Cthulu Carl posted:

Releated, here's a 777 wing stress test

Dirk the Average posted:

How many cycles do they run that for? For some medical implants, they're stress tested for the equivalent of 10-15 years (the testing is sped up to ~40-60Hz, which is not realistic, but is far more aggressive than normal conditions).

Cthulu Carl posted:

Yeah, it's was a test to failure. They calculated the wing could take 150% of the designed load, and it got to 154% before failing.

https://www.youtube.com/watch?v=Ai2HmvAXcU0

Sagebrush posted:

I believe the one in the gif is an Airbus of some sort. And for reasons I can't recall, the FAA doesn't always require testing to destruction any more -- pulling the wings up to some extreme level and letting them back down is enough. Maybe just the impracticality of breaking these strong new carbon-fiber designs.

Humphreys posted:

Brute Squad posted:

if only demo was always this easy
https://twitter.com/i/status/1348241886545207296

BillyJoeBob posted:

https://www.youtube.com/watch?v=fJGvPja49Rs

PainterofCrap posted:

Not any more.

The Lone Badger posted:

Canids otoh are at least as good at endurance hunting as humans despite having neither of those advantages.

poo poo POST MALONE posted:

Being knighted means absolutely nothing to anyone. Nobody cares.

SniperWoreConverse posted:

the more I think about it the more the idea of preinstalling breathalizers in new cars is the ultimate holy grail.

You have a set of requirements for the equipment that's pretty much this:
Get and record reliable timestamped info about the state of the vehicle. Driver is attempting to start, the vehicle is running or not etc.
Show information to the driver about their test, notify them that they need to take a test, etc.
Securely store and communicate this info to your database + get any additional info like pic of the driver, etc.
Prevent the engine from starting except in xyz condition.

If you were partnered with the manufacturer almost all of this is already taken care of. New cars have their own screens and poo poo. They have their own gps and clock which means you have reliable date and time info. They can transmit data through onstar or whatever. You have an insanely huge preinstalled user base.

You just have to wait for the dui's to roll in, and you can tack on an extremely reduced test taking apparatus + camera, it would be like how deep sea anglerfish males are a reduced parasitic life form clamped onto the female. You'd barely have to manufacture anything, especially compared to the old days, and wouldn't have to do invasive time consuming installations on the new vehicles, it'd be ideal. Politicians get to look tough on crime. Car manufacturers get to look responsible and safety first. Telecom gets their cut whenever it phones home. You're already supplying the gear cops use to test people for DUIs in the first place, so you're on good terms with them.

Literally all you need to do is manage the data, make sure the paperwork side looks good, and make sure the test taking part of the system is accurate. Even that is greatly simplified if you can partner with the vehicle manufacturer. You could potentially reduce the entire system to the highly simplified breath testing portion and one tiny self-contained chip that waits doing nothing until activation.

Cartoon Man posted:

https://i.imgur.com/B0MomNR.gifv

Can’t stop posting these.