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Sep 1, 2016 07:56
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tater_salad posted:the noise it makes is well worth a few fingnats https://www.youtube.com/watch?v=NSBGVhzGVxY OH HELL NAW!
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Sep 1, 2016 08:23
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Well there goes my question about how/if it can cook bacon in seconds 
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Sep 1, 2016 08:38
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What is it scouring off those metal parts? Old paint, or rust?
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Sep 1, 2016 08:52
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Krinkle posted:What is it scouring off those metal parts? Old paint, or rust? Yes
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Sep 1, 2016 08:58
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Looks like it can do both https://www.youtube.com/watch?v=dZ_90920Zbg
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Sep 1, 2016 09:42
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15 minutes away from leaving work today as i was reaching over some drill bits in a rack i put a 3 inch gash into my forearm. Cleanest slice ever i just grazed the bit and it felt like a fingernail scratch. I've had more painful paper cuts but its quite ghastly in appearance and i saw it cut through a few different layers of meat before blood started flowing. The other guy said to take a picture so i took 3. 1 for the thread. Here's a worker's almost bandaged forearm in a factory backed with 1, possibly 2, grey floors accented with crud. The shine is it's gory but didn't hurt much cause those drills are really loving sharp. Do Not Click if seeing blood makes you faint unless you need sleep. An inch to the right and it would have hit some serious poo poo. An inch to the left and it would have missed my white rear end.
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Sep 1, 2016 10:42
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Laser Cleaning Africa
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Sep 1, 2016 12:17
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amityville anus posted:15 minutes away from leaving work today as i was reaching over some drill bits in a rack i put a 3 inch gash into my forearm. Cleanest slice ever i just grazed the bit and it felt like a fingernail scratch. I've had more painful paper cuts but its quite ghastly in appearance and i saw it cut through a few different layers of meat before blood started flowing. The blood stains from when I sliced 4 fingers wide open and had to drive to a chemist to buy my own First Aid Kit are still on the loading dock floor and it was maybe 2 months ago...and still no site First Aid Kit on the premises.
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Sep 1, 2016 12:56
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amityville anus posted:15 minutes away from leaving work today as i was reaching over some drill bits in a rack i put a 3 inch gash into my forearm. Cleanest slice ever i just grazed the bit and it felt like a fingernail scratch. I've had more painful paper cuts but its quite ghastly in appearance and i saw it cut through a few different layers of meat before blood started flowing. That doesnt look too bad
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Sep 1, 2016 13:12
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DocCynical posted:https://en.wikipedia.org/wiki/Byford_Dolphin Holy poo poo. I knew that explosion/implosion killed all the divers, but I didn't realize the extent: quote:Hellevik, being exposed to the highest pressure gradient and in the process of moving to secure the inner door, was forced through the 60 centimetres (24 in) in diameter opening created by the jammed interior trunk door by escaping air and violently dismembered, including bisection of the thoracoabdominal cavity which further resulted in expulsion of all internal organs of the chest and abdomen except the trachea and a section of small intestine and of the thoracic spine and projecting them some distance, one section later being found 10 metres (30 ft) vertically above the exterior pressure door.
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Sep 1, 2016 13:39
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Darkman Fanpage posted:Laser Cleaning Africa Pls no futuristic racism in this good thread.
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Sep 1, 2016 13:56
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Platystemon posted:I think those are CO2 LASERS, with wavelength 10 600 µm, which is so far from visible light that it’s not hard to make very effective filters. Looks like it's actually a scary doubled/tripled Nd:YAG (532/354nm) from the website.
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Sep 1, 2016 16:47
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I'm working with some people who are home-building a 80w laser. It needs a lot more cooling than the old 40w tube, so they put it on me to come up with a solution. My solution? We had a huge plastic tub. I drilled some holes in the sides and put some bulkhead connections on. Inside the tank is a fountain pump, it pumps the water out of the tub and into the laser and back into the tube. I'm no engineer by I'm hoping it keeps the laser cool and doesn't do anything bad. We're also putting a thermometer on it so we can see the water temp because the laser tube doesn't want it going above 35. I guess if it gets too high we give the water a break to cool down. I wish it was all in a radiator or some huge series of metal tubes. Any idea how to get the water to cool down quicker? Eventually by the time the summer comes around we'll probably have to go with active cooling of some sort and stick a heat exhaust out the wall so the workshop doesn't fry.
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Sep 1, 2016 18:45
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Baronjutter posted:I'm working with some people who are home-building a 80w laser. It needs a lot more cooling than the old 40w tube, so they put it on me to come up with a solution. My solution? We had a huge plastic tub. I drilled some holes in the sides and put some bulkhead connections on. Inside the tank is a fountain pump, it pumps the water out of the tub and into the laser and back into the tube. I'm no engineer by I'm hoping it keeps the laser cool and doesn't do anything bad. A metal vessel to keep the water in would disperse heat into the air and cool faster. Have you looked into using a car radiator or heater core?
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Sep 1, 2016 18:47
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Gay Weed Dad posted:Have you looked into using a car radiator or heater core? this was my first thought as well, maybe with a standard electric car fan to further reduce temps
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Sep 1, 2016 18:51
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I feel like this is going to be a "puckins" thing where we read that some goon has built a literal death ray with advice from the internet
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Sep 1, 2016 18:51
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I'm just a bad chemical engineer can someone explain to me how rust, iron that has already been oxidized, can get burnt off with a laser? Most things that have been burnt can't be burnt again. It is very hard to burn water, for example. I'm confused. It's beautiful. I just want to know. Please don't own me I just want to know how a laser removes rust.
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Sep 1, 2016 19:20
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Krinkle posted:I'm just a bad chemical engineer can someone explain to me how rust, iron that has already been oxidized, can get burnt off with a laser? Most things that have been burnt can't be burnt again. It is very hard to burn water, for example. I'm confused. It's beautiful. I just want to know. Please don't own me I just want to know how a laser removes rust. It appears to be pulsed, so it generates hot spots that explode outwards and scour the immediate area. The clean metal underneath reflects rather than absorbs, so it doesn't get heated. So it seems to be equivalent to ultrasonic cleaning.
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Sep 1, 2016 19:28
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Krinkle posted:I'm just a bad chemical engineer can someone explain to me how rust, iron that has already been oxidized, can get burnt off with a laser? Most things that have been burnt can't be burnt again. It is very hard to burn water, for example. I'm confused. It's beautiful. I just want to know. Please don't own me I just want to know how a laser removes rust. how a laser removes rust, literally. One of the first links: https://www.reddit.com/r/askscience/comments/4a4r2p/how_do_the_lasers_that_remove_rust_work/
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Sep 1, 2016 19:29
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Krinkle posted:I'm just a bad chemical engineer can someone explain to me how rust, iron that has already been oxidized, can get burnt off with a laser? Most things that have been burnt can't be burnt again. It is very hard to burn water, for example. I'm confused. It's beautiful. I just want to know. Please don't own me I just want to know how a laser removes rust. https://en.m.wikipedia.org/wiki/Laser_ablation
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Sep 1, 2016 19:42
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SneakyFrog posted:this was my first thought as well, maybe with a standard electric car fan to further reduce temps If someone ever finds the need for all the cooling you could ever ask for in a hobbyist form, there's some guides on the internet of how to turn a window AC unit and a cooler into a glycol chiller.
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Sep 1, 2016 19:44
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I just cut cardboard to make model train buildings with my laser, but by upgrading to 80w from 40w people seem to think it will be able to cut thin metal and poo poo. The most OSHA thing we ever did to it was disable the safety interlocks and stick our fingers in to try to laser cut designed on our finger nails. DIdn't work. Power level needed to etch finger nail was also hot enough to give a burn under your nail, not pleasant. Some dude gave himself a burn tattoo with a laser though, not ours.
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Sep 1, 2016 19:44
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ringu0 posted:how a laser removes rust, literally. I was almost positive I tried and failed to find anything last night so maybe I phrased it wrong or just remembered wrong. THank you for not here-let-me-google-that-for-you'ing that, it would have been too much for my fragile ego. Do you need special ventilation to keep you from breathing in rust plasma/vapor?
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Sep 1, 2016 19:45
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Baronjutter posted:I just cut cardboard to make model train buildings with my laser, but by upgrading to 80w from 40w people seem to think it will be able to cut thin metal and poo poo. you know there is a thread for this right? https://forums.somethingawful.com/showthread.php?threadid=3739294 just in case you didnt know that there is a whole thread full of you crazy laser tinkerers GET LASER SAFETY GLASSES NERD
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Sep 1, 2016 19:46
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https://www.youtube.com/watch?v=_BgJEXQkjNQ&t=68s
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Sep 1, 2016 19:51
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That reminds me of the Amazin' Laser
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Sep 1, 2016 20:02
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Is it bad to laser etch tortillas? Kept the power down and did quick passes so they didn't catch fire but it still felt like Something You're Not Supposed To Do.
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Sep 2, 2016 03:19
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https://www.youtube.com/watch?v=rdzCv_9eaoM
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Sep 2, 2016 03:34
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I've pulled apart DVD and CD drives on old consoles to adjust the POTS. Are the warnings about radiation danger just meaning "don't point this in your eye, you dumbass" or is there any actual danger of radiation flooding the room just because I'm running the drive with the cover off?
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Sep 2, 2016 03:37
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FIRST TIME posted:I've pulled apart DVD and CD drives on old consoles to adjust the POTS. Are the warnings about radiation danger just meaning "don't point this in your eye, you dumbass" or is there any actual danger of radiation flooding the room just because I'm running the drive with the cover off? They use lasers to read the discs, and those can cause eye damage if you look directly at them. There's no danger otherwise.
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Sep 2, 2016 03:46
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Deteriorata posted:They use lasers to read the discs, and those can cause eye damage if you look directly at them. Or if the beam reflects in a weird way. Eyepro would probably be a good idea.
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Sep 2, 2016 03:52
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Baronjutter posted:I just cut cardboard to make model train buildings with my laser, but by upgrading to 80w from 40w people seem to think it will be able to cut thin metal and poo poo. We have a 75W laser that won't cut metal, and I doubt an extra 5W is the key. Laser-cutting steel is not quite what people think, anyway. The laser itself doesn't do the cutting. You need a high-pressure oxidizer blast (air, nitrous oxide, or oxygen) right into the beam's focal point; the laser heats the spot to incandescence, and the oxygen reacts with the iron at high temperature and the metal in the cut zone instantly "rusts." The iron oxide has a lower melting point than the steel, so it instantly liquefies and is blown out of the bottom of the cut. It's the exact same principle as an acetylene cutting torch. (Other metals, e.g. aluminum, don't cut as well as steel because their oxides melt at a higher temperature than the base metal. So you do need to literally melt the whole cut with the laser, which needs a lot more power, and the air assist just keeps the cut zone clean).
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Sep 2, 2016 03:53
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The Lone Badger posted:Or if the beam reflects in a weird way. Eyepro would probably be a good idea. Sounds about right. It always freaked me out as a kid that my Discman had that warning. I thought if I defeated the interlock while it was playing, I'd poison everyone in the room. 
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Sep 2, 2016 03:54
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Dead Cosmonaut posted:https://www.youtube.com/watch?v=Q8q3DZB_l6M I feel like I could get cancer from just watching the video.
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Sep 2, 2016 04:25
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Sep 2, 2016 04:39
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I assume there's an osha reg against this: And, posted without comment  
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Sep 2, 2016 05:28
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FIRST TIME posted:I've pulled apart DVD and CD drives on old consoles to adjust the POTS. Are the warnings about radiation danger just meaning "don't point this in your eye, you dumbass" or is there any actual danger of radiation flooding the room just because I'm running the drive with the cover off? 
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Sep 2, 2016 05:34
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"radiation danger" is a vague warning, to be fair. 
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Sep 2, 2016 05:38
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Don't go taking apart any smoke detectors, though.
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Sep 2, 2016 05:40
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