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Sagebrush
Feb 26, 2012

Yes, the car's engine would quickly redline and maybe blow up.

That could also happen if you were stomping the gas and then also stepped on the clutch, or bumped the car into neutral.

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The Lone Badger
Sep 24, 2007

Don't cars tend to have tons of computers and stuff that would quickly adjust the throttle?

Platystemon
Feb 13, 2012

as a person who never leaves my house i've done pretty well for myself.

The Lone Badger posted:

Don't cars tend to have tons of computers and stuff that would quickly adjust the throttle?

This is what traction control is designed to do.

Well, not for going off a cliff specifically, but if the wheels are spinning fast and encountering little resistance, nip it in the bud.

e: Yeah it’s generally brake‐based and while brakes are mechanically sufficient to stop a runaway engine, it might not do what you want it to if you’re driving off a cliff.

Platystemon fucked around with this message at 08:48 on Nov 25, 2020

Sagebrush
Feb 26, 2012

In all cars except very recent ones the throttle is directly connected to the pedal by a cable, so the computer has no control over that. Modern cars with drive-by-wire systems could block throttle openings that would cause engine damage, though, yes. Also, essentially all cars with electronic ignition and/or fuel injection will also cut the gas and spark at redline to attempt to limit the engine speed.

Even with electronic controls the engine can still briefly overrun if it's pushing large amounts of power and the load is suddenly removed, and a brief overrun is sometimes all it takes to cause damage.

Boat engines are noticeably less complicated than car engines, usually having few electronic controls. Many are still even carbureted, and a carbureted engine has no way at all of preventing an overrev if you pin the throttle open.

Platystemon posted:

This is what traction control is designed to do.

Well, not for going off a cliff specifically, but if the wheels are spinning fast and encountering little resistance, nip it in the bud.

Traction control is about controlling wheel spin, not engine speed. I suppose it's conceptually similar but in practice a traction control system or a limited slip differential does something very different from the engine rev limiter.

Platystemon
Feb 13, 2012

as a person who never leaves my house i've done pretty well for myself.
If it’s a Volkswagen, it will cut the throttle because it think’s you’ve put it on a dynamometer to test emissions. :laugh:

Memento
Aug 25, 2009


Bleak Gremlin

Platystemon posted:

If it’s a Volkswagen, it will cut the throttle because it think’s you’ve put it on a dynamometer to test emissions. :laugh:

Beat emissions tests with this one simple trick. The EPA hates it!

Cojawfee
May 31, 2006
I think the US is dumb for not using Celsius
A car engine could close the throttle, adjust the valves, and cut fuel to attempt to stop such an overrev.

Humphreys
Jan 26, 2013

We conceived a way to use my mother as a porn mule


Platystemon posted:

If it’s a Volkswagen, it will cut the throttle because it think’s you’ve put it on a dynamometer to test emissions. :laugh:

I don't know how the gently caress they survived that.

Cojawfee
May 31, 2006
I think the US is dumb for not using Celsius

Humphreys posted:

I don't know how the gently caress they survived that.

Because they are the largest auto manufacturer.

Cat Hatter
Oct 24, 2006

Hatters gonna hat.
Probably also doesn't help that most boats have open loop raw water cooling, which on a jet boat is basically just a tube that bleeds water from the jet pump directly into the engine for cooling (with a thermostat in the middle to restrict flow if the engine doesn't need maximum cooling) so hopefully he isn't running the engine too hard to be cooled for two seconds at a time.

Humphreys
Jan 26, 2013

We conceived a way to use my mother as a porn mule


Cojawfee posted:

Because they are the largest auto manufacturer.

Well I suppose they got away with the whole Nazi stuff so emissions isn't something they have had to worry about.

Shai-Hulud
Jul 10, 2008

But it feels so right!
Lipstick Apathy

Sagebrush posted:

In all cars except very recent ones the throttle is directly connected to the pedal by a cable, so the computer has no control over that. Modern cars with drive-by-wire systems could block throttle openings that would cause engine damage, though, yes. Also, essentially all cars with electronic ignition and/or fuel injection will also cut the gas and spark at redline to attempt to limit the engine speed.

Well depends on your definition of "very recent" cause electronic throttles have been pretty common for the last 20 years.

spookykid
Apr 28, 2006

Cojawfee posted:

A car engine could close the throttle, adjust the valves, and cut fuel to attempt to stop such an overrev.

I mean it could but they don't because this is such a stupid edge case why are we even talking about it? and adjusting the valves as a response to a massive decrease in load?

:thunk:

Sagebrush
Feb 26, 2012

Cutting the ignition and fuel is about the best you can do, and it's very easy to pull off.

Platystemon
Feb 13, 2012

as a person who never leaves my house i've done pretty well for myself.

Humphreys posted:

I don't know how the gently caress they survived that.

It’s because they made the state’s fate heavily intwined with that of their own.

Memento
Aug 25, 2009


Bleak Gremlin


"sorry? No, that's not my job"

Kanine
Aug 5, 2014

by Nyc_Tattoo

HelloIAmYourHeart posted:

Here's a wildly :nms: Reddit post from someone who got 3rd and 4th degree burns on her thumb from a homemade wood burning setup. It's fascinating but VERY graphic (like, her bone is visible). There are some pretty cool pictures of the reconstruction and her other burns in the comments.

SFW news article

yeah i knew people in art school in the sculpture program i was in who tried doing poo poo like that but pretty much stopped after the first try because of how freaked out they were by the sketchiness of it

Kanine
Aug 5, 2014

by Nyc_Tattoo
i cant remember if ive talked about it in this thread but i have some osha AS gently caress stories about the sculpture department when i was in college if anyone is curious

drgitlin
Jul 25, 2003
luv 2 get custom titles from a forum that goes into revolt when its told to stop using a bad word.

Sagebrush posted:

In all cars except very recent ones the throttle is directly connected to the pedal by a cable, so the computer has no control over that. Modern cars with drive-by-wire systems could block throttle openings that would cause engine damage, though, yes. Also, essentially all cars with electronic ignition and/or fuel injection will also cut the gas and spark at redline to attempt to limit the engine speed.

Even with electronic controls the engine can still briefly overrun if it's pushing large amounts of power and the load is suddenly removed, and a brief overrun is sometimes all it takes to cause damage.

Boat engines are noticeably less complicated than car engines, usually having few electronic controls. Many are still even carbureted, and a carbureted engine has no way at all of preventing an overrev if you pin the throttle open.


Traction control is about controlling wheel spin, not engine speed. I suppose it's conceptually similar but in practice a traction control system or a limited slip differential does something very different from the engine rev limiter.

Some traction control systems work by cutting ignition. It’s why you hear that characteristic stuttering noise.

Jabor
Jul 16, 2010

#1 Loser at SpaceChem

spookykid posted:

I mean it could but they don't because this is such a stupid edge case why are we even talking about it? and adjusting the valves as a response to a massive decrease in load?

:thunk:

Rev limiters are a pretty commonplace feature in many cars, though they're more to avoid Braydyn blowing up the engine doing a quarter mile than they are about a Dukes of Hazzard scenario.

wesleywillis
Dec 30, 2016

SUCK A MALE CAMEL'S DICK WITH MIRACLE WHIP!!

Jabor posted:

Rev limiters are a pretty commonplace feature in many cars, though they're more to avoid Braeydiynnn blowing up the engine doing a quarter mile than they are about a Dukes of Hazzard scenario.

FTFY

Most rev limiters shut off fuel rather than ignition right? Seems like shutting off ignition and dumping fuel would be bad for emissions.

evil_bunnY
Apr 2, 2003

wesleywillis posted:

Most rev limiters shut off fuel rather than ignition right? Seems like shutting off ignition and dumping fuel would be bad for emissions.
I don't think any OEMs give a single poo poo about emissions outside of test cycle parameters.

Jabor
Jul 16, 2010

#1 Loser at SpaceChem
Most production cars shut off the fuel for mostly that reason, yeah. (Tossing a bunch of unburned fuel out the exhaust isn't great for the exhaust components either).

The high-performance sporty cars that don't care about emissions shut off the spark instead, because the engine is already running super hot (and if you're hitting the rev limiter, it's still moving very fast and generating friction heat even if you're not blowing anything up inside it), and if you suddenly don't have fuel and exhaust gases carrying away some of that heat you're gonna have problems.

Verimus
Oct 1, 2009

Kanine posted:

i cant remember if ive talked about it in this thread but i have some osha AS gently caress stories about the sculpture department when i was in college if anyone is curious


Please share! I only did art classes up until year 9 but even at that level people would find new ways to hurt themselves with every new medium. A friend of a friend tried to break up a lump of hard clay by holding in in one hand while he stabbed it with a knife, did himself a stigmata.

Humphreys
Jan 26, 2013

We conceived a way to use my mother as a porn mule


I cannot remember if I posted Palaes' update from a few weeks ago. Looks like all is well in subterranean Australia:

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

mobby_6kl
Aug 9, 2009

spookykid posted:

I mean it could but they don't because this is such a stupid edge case why are we even talking about it? and adjusting the valves as a response to a massive decrease in load?

:thunk:

Vtec, my dude :rice:

Splode
Jun 18, 2013

put some clothes on you little freak
At least in a car in you go off a jump or whatever the transmission, wheels etc are all still there, which is better than one dinky propellor in terms of load.

shame on an IGA
Apr 8, 2005

spookykid posted:

and adjusting the valves as a response to a massive decrease in load?

:thunk:

ooo ooo I make components for a system that actually does this

too bad everything that has it is FCA garbage

https://www.caranddriver.com/features/a16580674/fiats-multiair-valve-lift-system-explained/

Kanine
Aug 5, 2014

by Nyc_Tattoo

Verimus posted:

Please share! I only did art classes up until year 9 but even at that level people would find new ways to hurt themselves with every new medium. A friend of a friend tried to break up a lump of hard clay by holding in in one hand while he stabbed it with a knife, did himself a stigmata.

ok so just off the top of my head some stories

-i seriously cant count how many shop accidents i knew of or directly witnessed that were directly a result of art students abusing prescription drugs like adderall/xanax/etc., extreme sleep deprivation during finals crunch, or a combination thereof. most of what im writing here is related to that.

-a professor who was in the same program in undergrad talked about how he was in the metal shop adjacent to the plaster rooms one night during studio hours and suddenly heard muffled screaming. he ran into the room and saw a girl trying to cast her arm in plaster of paris. he grabbed a hammer and started breaking it but by the time they got the girls arm out she had burns bad enough that she needed skin grafts on most of her hand and forearm. apparently she passed out which seems merciful at least.

-same professor: when he was in intro to metal fabrication his professor at the time took a plasma cutter and pressed it against the palm of his hand and said "i can pull the trigger with nothing happening because im wearing rubber shoes so there's no complete circuit" (or something like that i cant remember) but he was leaning against one of the metal welding tables, so the plasma cutter blasted a perfect tiny hole through the palm of his hand. he apparently was super lucky because it didnt do much damage and shot right between the tendons in his hand. the professor said later he now knows what its like to get stabbed with a lightsaber

-when i was a freshman during studio hours i saw a dude in the wood shop start grinding a piece of metal with a disk sander over a pile of sawdust from previous wood sanding. the sawdust poofed into flames from the sparks and the shop tech ran over with a fire extinguisher. the department head sent out an email to the whole school explaining "hey there's a reason we have separate wood and metal shops"

-i know this sounds relatively tame but holy gently caress the most injuries ive ever seen come from a single source was the intro printmaking classes. every single person i know in the illustration program i know who did printmaking classes has scars all over their hands from using those special carving tools for linoleum carving for linocut prints. seriously everyone i knew would never stick down their linoleum block with double sided tape and just end up holding it with their hand and then *whoopsie* now you sliced open the side of your hand/finger and your linoleum block is covered in blood!

-so so so many instances of foot or other lifting-related injuries in the metal/wood shops because sleep deprived students who were too shy/awkward/tired/etc. to ask a shop tech for help moving a heavy object they were working on.

-i knew like 3 different people who accidentally shot pin nails into their hands because they were holding a thin piece with their hand directly behind the nailgun muzzle.

-a student tried cutting a wooden sphere they found on a bandsaw in one of the woodshops and when it caught and spun because of the blade they got the tip of their thumb very messily sliced off.

-i should admit i had my fair share of injuries involving chisels. i never had any accidents with power tools because i think even when i was sleep deprived the noise and speed of the power tool kept me on my toes. all my shop injuries were hand tools because i felt like i was in control and had my guard down.

-the year before i started apparently a student did a project where they tried making a flamethrower out of pvc pipes or something. i wish i could have seen that.

-so many instances of angle grinder disks exploding!

-an acquaintance in one of my woodworking classes got one of those chainsaw tooth angle grinder disks to carve a seat for a chair and holy poo poo those things are sketchy as all hell. he didnt have any accidents with it but literally everyone kept a minimum of 10 feet away from him when he was working on that thing out of fear it would explode or he would lose control and it would run away or something

-not osha but one of the shop techs liked drawing dicks whenever he tested the plasma cutter or cnc or other equipment so when i went to his apartment for a party one time he had a ton of random metal cocks all over the place

MrQwerty
Apr 15, 2003
:smug: Good morning, you're all just pretending to need this "medicine" because you're drug addicts.

:angel: Good evening, directed pharmaceutical use of amphetamines obviously enriches the lives of many itt and I just woul
I worked at a parenteral drug factory that got dropped by 2 insurance companies in the 4 years I was there for constantly being 3-10% above OSHA incident rate standard yearly ama

Pigsfeet on Rye
Oct 22, 2008

I'm meat on the hoof

Memento posted:



"sorry? No, that's not my job"

Chabuduo

EvenWorseOpinions
Jun 10, 2017

HelloIAmYourHeart posted:

Here's a wildly :nms: Reddit post from someone who got 3rd and 4th degree burns on her thumb from a homemade wood burning setup. It's fascinating but VERY graphic (like, her bone is visible). There are some pretty cool pictures of the reconstruction and her other burns in the comments.

SFW news article

A couple other students and I ran out of projects the last year of my technical school and got a hold of an old microwave someone donated to the school for a fundraiser, so naturally we scavenged the transformer and plug and made a Jacob's ladder and a few lichtenberg figures. Our setup was very OSHA, our emergency planning in its entirety was having someone stationed at the outlet to pull the plug if anything went wrong. Our instructor at one point came by to see why there was a mob in the welding corner, told us that it was pretty cool but he couldn't watch because it would be a liability.

I don't think I would do this again without vastly rethinking safety setup

EvenWorseOpinions fucked around with this message at 16:58 on Nov 25, 2020

Cojawfee
May 31, 2006
I think the US is dumb for not using Celsius

spookykid posted:

I mean it could but they don't because this is such a stupid edge case why are we even talking about it? and adjusting the valves as a response to a massive decrease in load?

:thunk:

The engine in my car does throttling via the valves. The actual throttle opens fully and the amount of air entering the cylinders is controlled with how far the valves open. It's complicated and expensive, but I guess it improves throttle response.

PittTheElder
Feb 13, 2012

:geno: Yes, it's like a lava lamp.

My only shop class story was when I had to use the belt sander to finish something, I was so scared of it breaking so I sanded it extensively by hand first. Even then the drat thing snapped the instant the wood touched it. That's when I decided wood working wasn't for me.

Kanine posted:

-same professor: when he was in intro to metal fabrication his professor at the time took a plasma cutter and pressed it against the palm of his hand and said "i can pull the trigger with nothing happening because im wearing rubber shoes so there's no complete circuit" (or something like that i cant remember) but he was leaning against one of the metal welding tables, so the plasma cutter blasted a perfect tiny hole through the palm of his hand. he apparently was super lucky because it didnt do much damage and shot right between the tendons in his hand. the professor said later he now knows what its like to get stabbed with a lightsaber

I want to hear a full description of the feeling, god drat

shame on an IGA
Apr 8, 2005

some degree or other of variable timing is near universal at this point, I would be hard pressed to find anything from the past 10 years that didn't at least have cam phasers.

canyoneer
Sep 13, 2005


I only have canyoneyes for you
I was cutting a 5" cut of a 2x4 with a miter saw yesterday and didn't realize that I didn't have the saw slid to the fully backwards position. The piece kicked back and shattered the plastic dust chute on the saw and scared me half to death.

That was extremely dumb and I'm glad I have all my fingats.

Whooping Crabs
Apr 13, 2010

Sorry for the derail but I fuckin love me some racoons

HelloIAmYourHeart posted:

Here's a wildly :nms: Reddit post from someone who got 3rd and 4th degree burns on her thumb from a homemade wood burning setup. It's fascinating but VERY graphic (like, her bone is visible). There are some pretty cool pictures of the reconstruction and her other burns in the comments.

SFW news article

I can't believe that they were able to save her thumb. I hope her boyfriend survived, it seemed like he got the worst of it in the news article.

Platystemon
Feb 13, 2012

as a person who never leaves my house i've done pretty well for myself.

Kanine posted:

-same professor: when he was in intro to metal fabrication his professor at the time took a plasma cutter and pressed it against the palm of his hand and said "i can pull the trigger with nothing happening because im wearing rubber shoes so there's no complete circuit" (or something like that i cant remember) but he was leaning against one of the metal welding tables, so the plasma cutter blasted a perfect tiny hole through the palm of his hand. he apparently was super lucky because it didnt do much damage and shot right between the tendons in his hand. the professor said later he now knows what its like to get stabbed with a lightsaber

They call him The Stig.

Robert Facepalmer
Jan 10, 2019


Who wants more art school stories?

I grew up in mostly rural areas, so I was the designated frame-maker for our painting class when we stretched our own canvas. I didn't mind as it meant more reasons to talk to the girls I liked. The ONE time I wasn't around to cut wood, a couple of kids that thought they knew what they were trying to do tried to rip a 4x4 into something insane like 1x2s. Kid A is having trouble pushing the stock through, so gets Kid B to help pull it from the other side. Fortunately Kid A is just slightly off to the side as the saw kicks the wood back hard enough to go through the door and partially embed itself in the lockers lining the hallway...

...right in front of the dean as she was heading back to her office.

After that I was the official designated frame-maker for that class and the semester after, though my suggestion to move the table saw away from the door, or at least rotate it 90º never went anywhere.

We also had a print room with all kinds of fun OSHA mishaps waiting to happen, but wood or lino accidents were pretty rare as there were so many bench hooks around you would always be able to use one. What DID ruin hands was this ancient-rear end, foot-operated guillotine sheet metal cutter for cutting nickle plates down for intaglio prints. It wasn't electrical-assisted or anything, you just had to stomp down on the foot pedal to cut the sheet mechanically, so some of the smaller girls would have to jump with both feet or even two of them would have to jump on to get enough ooomph to get through the plate. Of course the cuts were not clean at all as the downward side would have this lip of jagged-rear end razor sharp metal just thirsting for co-ed blood, but it usually only took one 'do I REALLY need to file this edge down...' per class for people to learn not to test the edge with their finger/hand.

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Ornamental Dingbat
Feb 26, 2007

My dad went from being a chemistry major to an art major. It was jarring to be using a lot of the same chemicals and solvents but instead of opening them carefully under a fume hood and measuring out an exact quantity he would just poke a hole in the can with a screwdriver and pour out whatever looked like the right amount.

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