Squids in danger

Squids and other cephalopods have been found with high levels of "chemical contaminants" in their bodies. Since many ocean dwellers eat squid and octopi, scientists are worried that the entire food web is being comtaninated.Full story at Cnn.com

Posted by Lithium Rain 9 years ago


Heat absorbing glass question Answered

I'm taking apart a Kodak 4200 projector. The lamp assembly includes a piece of "heat absorbing glass".  The manual says not to touch it unless wearing gloves, to keep it covered when out of the projector, and that it may shatter.  Being clueless, this sounds spooky.   Is it dangerous, or will I just wreck it for projection if I get fingerprints on it?  Most glass shatters, but is this going to spontaneously burst into shards?  It's not going back into the projector.   Is it useful for anything, or should I wrap it in foil and toss it in the garbage?

Asked by mole1 4 years ago


Tesla Costume

Hello, so this year for halloween I am hoping to go as our hero Nikola Tesla. the costume will be fairly easy I'm just planning on wearing an old suit etc. but what i really want to do is incorporate some type of electrical effect into the costume. I know a bit about electronics and can solder and figure things out when needed, all i really need is an idea of some type of electrical thing that wouldn't kill me and i can power via batteries.  in a perfect world I would like to create some type of spark gap generator between my hands but this might be too lofty an aspiration.  Anyway if anyone has any ideas specifically ones that wont kill me and aren't too hard to accomplish i would be very grateful. 

Posted by jumbohiggins 7 years ago


What to do about asbestos ceiling tiles in an old house?

My daughter just bought an old house that has asbestos ceiling tiles.  What's the best route? Cover them with a sealant, add a new dropped ceiling or W H A T?   Help

Asked by mimiodella 5 years ago


Can I work on a TV without discharging the CRT?

I have a TV that is in a place where the remote will not work (Dont ask its complicated lol) and I want to rewire the ON/OFF switch on it so that it will be like a foot or two away from the tv. Do I have to discharge the CRT on it before I work on the ON/OFF switch which is only attached by wires to the CRT and flyback transformer circuit. Could I just wear some thick rubber gloves to work on this because Ive never discharged a CRT before and have no interest in doing so.

Posted by jackillac92 9 years ago


6 Farad Coilgun

I recently came across 4 1.5Farad capacitors and made them into a capacitor bank, but I just want to get a general idea what would happen if I made a 6 farad coilgun...would it go through walls or anything?

Posted by adrewmc 10 years ago


Is soldering a health risk?

I was just wondering how (aside from being clumsy and burning yourself) soldering can be a health risk. I would suppose the fumes would be bad for you, and is there anything else? And is it safe to solder in an average room in a house, or should I do it outside for better ventilation? 

Asked by diggingeagle 7 years ago


Dangerous Local Pest, What to do ? Answered

Well the local wild coyote is boldly walking up and down our Reno street at 2pm in the afternoon, sniffing at the neighborhood house dogs leg-lift corners and bushes.  As a life rule, I figure "live and let live"... The bears and wild animals are moving into town because food is scarce in the mountains this year and our leaders admonish us for leaving garbage readily available and encouraging predation.    BUT this afternoon there was some confrontation at the fenced pen our dog uses for his duty and our dog was afraid to go out and chose to leave a large pile in our computer closet which I boldly managed to step into with both feet when starting the computer after supper.  Yes, I was prepping to do our monthly ledger but first I managed to drag brown foot prints over rugs through our bedroom to our bathroom.  After a couple hours of cleaning the most foul smelling dog poop, the monthly bills and Febreze treatment of the wall to wall rugs, we had to use a leash and collar to get our naughty pet to step out to the high fenced dog pen and let him discover it was safe ! ....  We watch preschool grand children and fear the situation.  What to do ?? ... I could rig an IR light beam trip wire to cause a servo to rattle some cans to discourage coyote walkabout in my yard but hope someone has a better suggestion ?

Asked by iceng 3 years ago


Tritium encased in plastic: a few questions

My main question is, the Key fob being sold at  Deal Extreme, is it safe?   I seem to remember from one article that stated it is fairly safe as long as it remains exterior to the body (in other words, do grind it up and breath / snort it, and don't swallow it). Is that a fair (generally) statement? I am started to question some of the things I find and read at wiki-im-pedia     

Posted by Goodhart 8 years ago


Redneck Rollercoaster

This is called the Redneck Rollercoaster, but that's not quite the truth. This is an insane car mod that looks fun as hell and has the danger factor to bump it up to make it extra stupid. So who doesn't love some stupidly dangerous fun? Weirdos. Who loves it? Canadians.FYI, the guy on the left on the sofa is the driver. And how it works...

Posted by fungus amungus 10 years ago


are high power ir leds dangerous? Answered

Im experimenting with ir motion sensors and im think i have a working model, but then i realized i would have a ir led on at almost 150 ma and i didn't know if that was safe, so i managed to reduce it to 10 ma and still work, but then i realized that if i didn't know how dangerous ir leds are, then any level could be unsafe for all i know (i came to that realization after i changed the circuit because im smart like that) i couldn't find any safety info on ir leds, just ir lasers, is there a certain power to distance ratio or anything i should know? aside from not shining it directly into my eyes (im not that far-gone)

Asked by the judge 8 years ago


Can someone help me with this circuit? Answered

I'm working on a fireworks ignitor based off of Bill Gurstelle's design in his book Absinthe and Flamethrowers, and I'm having some trouble. Instead of two switches, mine has three switches.  Like Bill's design, it runs off of eight AA batteries. One end of the battery pack goes to a toggle switch and a keylock switch, and the other goes to a pushbutton. They both end at a bolt. I have two long wires with alligator clips on both ends. Each clip clips to the bolt, then to a piece of nichrome wire which is wrapped around a fuse. In theory, when all of the switches are flipped, the nichrome wire lights the fuse. But this isn't happening. I've tested all of the switches, and they all work. The bolts and the nuts holding them in place both conduct electricity, but no power is arriving at the bolts. All of the components were purchased from Electronic Goldmine, except for the battery pack, which I bought at Radioshack. The ignitor is housed in a wooden (and therefore nonconductive) box. What's wrong?  (Attached is an awful drawing/collage I did of the circuit. If you need a picture of the machine itself, I can take a picture.) Thanks, Noahh

Asked by noahh 7 years ago


Paintballing

I found this at http://forum.specialopspaintball.com/index.php?showtopic=58518 . I brought this to the Instructables community because some people don't seem to realize what paintball really is. Post you tips and questions and I will either add them to an Istructables or try to answer your questions. But if you click the link and read, you will probably won't have any questions.

Posted by ry25920 10 years ago


Are you to blame?

OK, I know it's a deliberately attention-grabbing topic name. Sorry about that.There was a post on the Bamboo bike frame, essentially saying "a disclaimer that this could be dangerous isn't enough; people aren't qualified to judge the strength of their homebuilt bike frames so might still get hurt even if they are careful", which attracted a lot of ire, but also a response from whiteoakart reframing the question, thus:As a maker and writer of an Instructable, what is your responsibility to keep your readers safe? How far does your culpability extend?This is obviously a knotty issue, and one that seems to have a range of attitudes across the board- some people say "pointy things are pointy, hot things are burny, don't hurt yourself" and leave it at that, some people list all the grievous injuries possible from their Instructable.In my opinion, there are two major things to consider:Is a person likely to do themselves harm even taking reasonable precautions?An Instructable on how to weld, with clear advice on breathing protection, eye protection and not electrocuting yourself should be "safe"An Instructable on free rock climbing, even with all the advice in the world about how to climb well, could easily get someone killed because free climbing is inherently dangerousIs the intended audience capable of accurately assessing the risks? The risks of a table saw are obvious- put your hands in the wrong bit and it will cut them off- but the risks of high-voltage electrics are harder to judge with simple "common sense" because a seemingly minor fault could be lethal.Both of these have an element of "reasonable" to them- if you make your instructions foolproof nature will give you a bigger fool, but there is a point at which it is reasonable to assume that a sensible person following your instructions with care and attention will not injure themselves.More thoughts?

Posted by PKM 8 years ago



Does anyone have any ideas on building a DIY flying machine?

When I say 'flying machine', I mean I want to be able to relatively safely take off from the floor, fly, and land the thing, preferably sans death. I think my best bet would be something simple, not easily achieved, I'm aware, but still, any ideas guys?

Asked by paradoxdetected 8 years ago


Ignition Coil

Yes, I just posted something on a flyback. I was interested in that, until I saw this. It got me interested in ignition coils, so I got one new from the autoparts store for $20 (USD). I looked on the site, for the schematic, and realized that I didn't know what the rectangle was. Is it a resistor? I'm new to electronics, what size resistor do I need (if it even is a resistor)?What about the capacitor? I have a 100uf 200v electrolytic one, will that work?Also, part of the core is not in the coil, it's square shaped, could I rig it to work like this flyback circuit?Or this one? (simple driver circuit)?Sorry about the never ending beginner electronics questions, I just really don't have anyone else to ask.

Posted by John Smith 10 years ago



Help!! It's 3am and I have a bubbling and squeaking battery!

Please help! I procured an electric wheelchair today (worn and torn, but in good shape.  It had 2 12v batteries, little smaller than an auto batt.  Didn't write down the amperage tho...The batteries were visually inspected for bowed or expanded sides, cracks, oxidation.  Everything appeared in order.  They have likely been sitting for some time.  Stupidly, I did not check electrolyte levels.  Oops.  Could easily be low.  I plugged the charger into the mainboard for 30 minutes, watching closely.  No issues, no overheating.  I left it for another 2 hours.  Again, no noticeable issues.  I tested the drive motors by controlling it around my driveway briefly. Power was very low.  It worked, but clearly lacked juice. I plugged the batts in for another 4 or 5 hours.  But after that time, I noticed a crackling/squealing (faint) sound.  As if pressure was escaping.  Bad news.  I had the chair chassis (and batts) in my workshop, and now I was afraid it may blow, contaminating everything.  The batteries feel warm. One more than the other. Beginning to panic, I threw on my goretex, respirator, goggles and gloves and carefully detached the battery cable from the main board.   I've never had one of this size blow, and have no idea what it could do.  very hesitantly, I rolled it into my garage, and closed the door.  Now I'm afraid to sleep, because I'm concerned about it. Is this Normal old battery behavior?  Could this be due to low electrolytes?  A small crack in the case?  Is there anything I can do besides wait?  I'm not real anxious to go too close for too long.  Is there anything I can do that would not increase hazard?  I'm about to throw a tarp over it, but is there a high flammability risk if a high amperage 12v were to blow? Guidance highly appreciated.  Thank you.

Posted by huck alexander 5 years ago



Dangerously Fun

Just found an interesting website I thought I'd share:http://dangerouslyfun.com/They've got a fairly small set of projects but they look pretty well done. From the About page:"DangerouslyFun.com provides instructions for creating various physical devices, many of which are dangerous. This information is provided in recognition that dangerous things are sometimes really fun."Amen brother!

Posted by rachel 8 years ago



Are there any dangers in handling transformers? Answered

 I recently got a hold of a old arcade cabinet and I plan on gutting it. In the process I discovered that there was a big transformer present in the machine. Are there any dangers in removing the device? And if so how do i prevent myself from any harms?

Asked by hacker3455 8 years ago


Saw blade spins way too long after the cut.

Do most power tools (such as Drill Press, Circular Saw, Table Saw, Router, Compound Miter Saw, Disc Sander), come with built in "brake" mechanism which will help slow the tool down once the energy is cut off?  My Compound Miter had a functioning brake that later stopped working.  I have very hit and miss experience with this.  Some do sometimes, and others never do at all.  OK, My tools aren't high end makes. My brands lean more toward the Chinese vs the Swiss.  Waiting on the tool to spin down to stop tests my patience. Perhaps there is something simple I cound modify to enable a reasonable brake function. (I'm hoping to do a tweak as opposed to taking metal to smelter and starting over) Any thoughts?  Any help is Greatly appreaciated!  BOB Z

Posted by bobzjr 4 years ago


Are my flyback projects dangerous? (x-ray) Answered

Hello, I was wondering if any dangerous x-rays or other caustic things like ozone are created when I'm testing my flyback transformers. How much ozone and how much x-rays is dangerous to humans? could long-term use of flybacks create radiation poisoning? I'm actually a little worried :/

Asked by DELETED_Electorials 6 years ago


Is it dangerous to take apart a honeywell space heater?

I have a broken honeywell space heater. Everything works exept it dosent heat up. Is there a way to fix it and is it dangerous?

Asked by michoi 8 years ago


Sawing MotherBoard PCB's- Inhaling Dangerous Dust Particles? Answered

I have recently salvage a couple MotherBoard PCB's, And I was wondering if I cut them (saw them with a hacksaw) Will they give off a lot of dangerous dust? I've heard people talk about the fact that it's dangerous, So I was wondering it it really is. If it is, I thing I'll score the PCB's with a utility knife, Or just throw them away

Asked by Yonatan24 2 years ago


Weather alert: Hurricane ike is gonna strike!

Cheesy titles aside, this is serious buisness! i live in houston, and the hurricane is heading strait for us. i'm a little scared, of course, and the roads are all clogged. My mom has been looking around for gas stations with gas left... it's a pretty big deal. houston is 45 miles from the water, and the hurricane has been moving around towards us, and gaining speed, all overnite. i'm praying to god it doesn't strike. the mayor has had press conferences, cancled work and school... we may have to evacuate! i'm hoping this won't be another katrina... any thoughts?

Posted by AnarchistAsian 9 years ago


best mosfet config for a powerful flyback driver? would a capacitor across the flyback windings improve preformance?

Well i have an instructable on my singing arc project, i tried the simple 555 driving a power mosfet, but they kept burning out. even the IRF840!!! rated for 500V!!! what am i doing wrong? i tryed using a neon lamp with a series resistor of 4.6K ohms (i think) but it didnt help at all, in fact, it wouldn't even light, yet i got a nasty shock and 2mm spark from the 555 timer, i was amazed that it survived, but not for long, anyways. so i moved on to try a fast diode across the primary, but backwards, to absorb the back-EMF. but it just cut away at the output significantly (from an 2 cm to less than 5mm). it got quite warm in the process too, for the few seconds it was on. i havent tried it yet, but would a diode in series with the power supply, mosfet, flyback, and ground work better? and give a place for the electricity to go? what would a capacitor across the primary do? i heard people doing this and increasing the output, but will it impair an audio signal?

Asked by -max- 5 years ago


Dangerous or Incorrect instructables

"Flag As" only supports Wrong Category, Inappropriate, Incompleted, and Spam. How does one report something as "Dangerously Wrong"?   Such as this one that was actually part of the "Featured" email that goes out from instructables: https://www.instructables.com/id/Power-Bank-1/

Posted by krsmes 2 years ago


Would it be dangerous to submerge a plasma ball in mineral oil?

I'm thinking about creating an art project, but would need to submerge the glass part of a plasma ball in mineral oil (which I've heard is not conductive). Would this be dangerous?

Asked by rockyreasoner 8 years ago


Danger is my middle name leaving her mark

Celeste, aka Danger is my middle name, has been an intern here at Instructables for the summer.  Today is her last day and she is making sure to leave her mark behind with these great paper stars! Thanks for being so awesome!

Posted by Penolopy Bulnick 4 years ago


NOT LIABLE?

What happened to the NOT LIABLE selection?

Posted by dentsinger 10 years ago


Illegal dado blades? Answered

Dado blades are illegal to sell, buy or use in some countries e.g. Denmark due to the danger. What kind of dangers are there when using dado blades?

Asked by DennisP88 1 year ago


How much electricity is dangerous?

I found plans to make a device to give yourself a static charge using a negative ion generator. It outputs 7.5 kV and 10 mA. I've seen it in use and I know it's not dangerous. I wanted to build two of them together making it output 15 kV. Unfortunately that would also make it 20 mA. I'm not sure what the resistance of the human body is so I guess my question is will 15 kV and 20 mA flowing through a person be dangerous? Thank you for the replies and I'm sorry if this is a stupid question. I'm pretty new to my electronic hobbies.

Asked by bruechel87 5 years ago


A dangerous path to walk.....

A man and a mythJudge for yourself. It is your health, indeed your life that may be at risk if you take the advice of a "salesman" over a health official.

Posted by Goodhart 10 years ago


Caution ,danger message

A cordial greeting to the whole community; I would like to ask if there is a standard formula to alert the who is reading to pay attention to the dangers of electric current while you perform a job and at the same time to arise from any liability from damage caused by an incorrect or incomplete understanding of instructions step by step. thank  for help  

Posted by torx 3 years ago


Are the hops in beer wort still dangerous to dogs after being composted? Answered

I make beer. I make compost. I would like to use the former, to assist the latter. However, as most home-brewers already know, hops are very dangerous to dogs. This made me wonder: If I use the wort that I strain out of my homemade beer, will the hops in the gooey mess still be dangerous to my dogs if they get into the compost days/weeks/months later?

Asked by Sunkicked 7 years ago


student arrested for camera tazer... are dangerous instructables acceptable?

Well, a 14 year old boy in Connecticuit was arrest for modifing a disposable camera into a tazer, making it into a weapon. Well you may have noticed that instuctables shows multiply how to's on this very weapon. My question is, should dangerous and illegal instructables be tollerated on this site? I think anything that dangerous, or illegal should be taken off the site even though they are just for "informational purposes". I'm not saying that it is instructables or any authors of those instructions fault, but i think that there have to be more guild lines for what is acceptable.link to article: http://ca.news.yahoo.com/s/capress/080403/technology/technology_shocking_camera

Posted by hedgiehog 10 years ago



what is the safest type of welder?

Exactly what the title says i know they are all dangerous but which is least dangerous and what about those homemade ones with microwave transformers or the one with batterys and jumper cables

Asked by BIGHAIRYDUDE 7 years ago


What is this component? is it a solid state relay? Answered

I want to know if it is a solid state relay. i got it in an old photocopier matsushita. on the component it is written  sf16drz-h1-4 input    DC4~7v OUTPUT  AC 210V 16A K975c MITSUBISHI Electric it has 4 leads out. 2 small and 2 big. I googled it but no success and if you know explain to me how this component works. it has  a large heatsink on the top

Asked by ARJOON 7 years ago


5 dangerous things you should let your kids do by Gever Tulley

Here is a great talk about 5 dangerous things you should let your kids do by Gever Tulley. I would really encourage you to try all other things w/ your children, cousins, brothers, sisters or whomever. Here is a link to the video. I don't think instructables can embed videos from ted but I will try to it anyway. UPDATE I found a youtube version. Thanks

Posted by joejoerowley 10 years ago


Is showing the user SQL error messages dangerous? Answered

If during error conditions your website shows a page full of SQL messages, does this put you at greater risk of an injection attack?

Asked by NobodyInParticular 9 years ago


Is galvanized steel dangerous to be making rings with?

I am making chainmail in my room and my dad thinks we'll get zinc dust in our carpet and possibly get sick from me bending the wire.

Asked by pindalanderz 9 years ago


Any danger in Parallel battery circuit?

Hi, I have a voice recorder that runs on a 1.5 V AAA battery. I keep running through too many of them. I have more  AA batteries and I was able to figure out a  setup to run it off non-AAA sources. I was thinking of connecting 2 AA in parallel. Is there any danger my recorder if I do that? Any power spikes  or other things that can destroy my recorder?

Asked by phillyj 8 years ago


Are electric vehicles deadly dangerous to build and repair? Answered

A local high school tech class is converting a pick-up truck to electric and I got the idea that I could convert our Explorer, (the engine is shot) but an auto mechanic I met told me he can't get insurance to work on an EV due to the danger of the high voltage- this is disappointing to me because I could really get a lot of use from re-purposing this truck to a green(er) vehicle. Help me be more green!

Asked by paganwonder 9 years ago


Is it unbelievably dangerous to run a crt tv without its casing? Answered

I'm working on an art piece and i just reckon it'd look a whole lot better and 'fit' better overall, but i'm wondering if somebody accidentally brushing up against it or touching it could turn out badly.

Asked by potatosaur 7 years ago


Heath and Safety Flag

I think it would be a good idea to add a new flag category: Health and Safety, to cover instructables whose use could cause bodily harm or have unintended consequences. Many ideas pass through here, some are not as well thought out as others, and some are just dangerous and unsafe.

Posted by ringai 5 years ago


Airsoft

How many of you have played around with something dangerous and want to share about it?

Posted by gatorfan94 10 years ago