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We're recovering from a major server loss and are restoring backups as we gain access to them. Don't mind the odd time warp. Warn us in the future.

Heating duct engineer by William Conderfoot - Thu, 25 Oct 2012 10:43:16 EST ID:LmAefPGY No.5034 Ignore Report Reply Quick Reply
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I came into this game for the action, the excitement. Go anywhere, travel light, get in, get out, wherever there's trouble, a man alone. Now they got the whole country sectioned off, you can't make a move without a form. Listen, this old system of yours could be on fire and I couldn't even turn on the kitchen tap without filling out a 27b/6... Bloody paperwork.
Isabella Snodwater - Mon, 15 Sep 2014 01:58:32 EST ID:0l9kqM5+ No.6489 Ignore Report Quick Reply


Electric Gun by Charles Millerwetch - Tue, 03 Jun 2014 16:08:16 EST ID:5gD9lQi4 No.6340 Ignore Report Reply Quick Reply
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Any information about the piezoelectric ignition threshold for firing a .22 rimfire round?
What kind of math would you have to do to find the electricity needed for this sort of thing?

Super compact rimfire potentially incoming.
2 posts omitted. Click Reply to view.
Idunno - Thu, 12 Jun 2014 11:54:50 EST ID:5gD9lQi4 No.6360 Ignore Report Quick Reply
Right. I would just use .22 LR rimfire rounds (Preferably blanks) because they're the smallest, cheapest, most available ammo out there. I know the Metal Storm military system uses electric charge to deliver the ignition to the round at the front of the barrel, because it can't hand the charge off to anything else. (It's at the end of the line). But if a piezoelectric igniter for a barbecue lighter delivers enough amperage, that works too. I'm just trying to calculate the threshold for primer ignition and see if I can match that value with a reasonable number of, say, AA batteries in series/parallel.
Gazpacho - Tue, 02 Sep 2014 03:33:14 EST ID:9Fgjepcp No.6467 Ignore Report Quick Reply
Right now I am trying to figure why he'd need that mechanism O_O
Barnaby Clashhall - Thu, 04 Sep 2014 17:19:17 EST ID:2s0Y1xJY No.6472 Ignore Report Quick Reply
Hey my thread is alive again!

I wanted to put a gun into a super small space, like an altoid tin or a zippo lighter.
Thought it would be cool to have a zippo gun. I know people do it, but with piezoelectric ignition, it could be SUPER compact.
Simon Blatherwill - Sat, 06 Sep 2014 22:36:02 EST ID:VGutYBla No.6473 Ignore Report Quick Reply
That would be cool. Have you got any plans drawn up to see if it would work?

I found this that looks pretty cool: http://www.everydaynodaysoff.com/2010/11/27/zippo-lighter-gun/
Frederick Heblingchatch - Sun, 07 Sep 2014 22:53:39 EST ID:2s0Y1xJY No.6475 Ignore Report Quick Reply
Yep I'm pretty sure that's where I first got the idea.
I don't have any formal plans at the moment, I just made it a goal of building a system that could safely fire .22 rounds before getting fancy about it. After studying the extensiveness of mechanical/physics knowledge necessary to casually construct things like this, I don't think I will be able to put it together until I have some serious free time. Plus, I'm back in school now, so I gotta focus on finishing my Biology major before I can go and do all the other projects.
>Having ADD doesn't help either.

career advising by Reuben Buzzshaw - Tue, 02 Sep 2014 17:42:41 EST ID:h4yAb3hN No.6468 Ignore Report Reply Quick Reply
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Completed my first term community college. All I know is I'm pretty good at math and I enjoy it. People keep telling me to pursue engineering degree or something. Don't know what else I would want to do. Have a career advising appointment in a couple weeks. I want to know what my choices are if I do decide to become an engineer. Do you guys have any advice for me? I would seriously appreciate it.
Gazpacho - Wed, 03 Sep 2014 23:44:52 EST ID:9Fgjepcp No.6469 Ignore Report Quick Reply
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Advice for following any career line; pick one you good go to work on a shitty day and tolerate if at worst, or at best makes your day better. From there see what you'd wanna practice. CE, CS, EE, ME or in my metallurgy.
Gazpacho - Wed, 03 Sep 2014 23:46:44 EST ID:9Fgjepcp No.6470 Ignore Report Quick Reply
Fuck my grammar isn't with me tonight.

can this be done? by Simon Duvingdore - Wed, 06 Aug 2014 00:34:57 EST ID:zCR9OQf3 No.6429 Ignore Report Reply Quick Reply
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is it possible to engineer robotic engineers to make nanos that go into the stream and flow of a cancer patient?

i see doctors these days using technology kinda like a video game right?

if nano technology is real then why can't it be usesd to cure cancer? and then little lasers or something eat away at the cancerous cells bit by bit.. i mean.. if it can be done would this be a practical way to rid the body of cancerous cells?
Rebecca Cimmerwater - Sun, 31 Aug 2014 06:03:54 EST ID:5JL102Ix No.6466 Ignore Report Quick Reply
Nothing close to nanodocs, like in Dirty Pair: Sim Hell or the Eric Bana Hulk, Michael Crichton's "Prey" covered the problems with making itsy little clanking self-replicators pretty well.
Closest I've heard to that was an application of Buckyballs made of a co-polymer, like a tank of them used as a filter, that captures diseased blood cells for treating leukemia. Only they had to manufacture the buckyballs in space, in microgravity.

Thermite yo by Shitting Bushstune - Thu, 21 Mar 2013 07:40:29 EST ID:nhiG8qtg No.5506 Ignore Report Reply Quick Reply
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Would this work? If so how could it be optimized? I was thinking of adding some barium nitrate in there but I fear it may burn too quickly, was also wondering how effective it would be if the oxidizer was replaced with say, copper oxide?. I need suggestions from the fine folk of /tesla/.
16 posts and 2 images omitted. Click Reply to view.
Sidney Brocklestone - Sun, 27 Jul 2014 19:06:39 EST ID:5gD9lQi4 No.6421 Ignore Report Quick Reply
I lol'd pretty hard.
CrazyFolksTribe !loJSOMZg0g - Thu, 31 Jul 2014 01:55:52 EST ID:dad5QzS2 No.6425 Ignore Report Quick Reply
Matilda Geblingdale - Sat, 16 Aug 2014 19:03:20 EST ID:zo57f3iv No.6444 Ignore Report Quick Reply
>thermite near any part of your body
retard had it coming
Albert Greenfield - Wed, 27 Aug 2014 17:49:39 EST ID:5+sMfTlK No.6459 Ignore Report Quick Reply
OP's dildo may contain sensitive information, and consequently he/she needs a way to destroy it quickly should it fall into enemy hands. Consider adding a radio detonator in addition to >>5517 's advice.
Angus Dundlehall - Fri, 29 Aug 2014 09:31:41 EST ID:SwrqeSTp No.6464 Ignore Report Quick Reply
This boards namesake would be proud, you guys.

Water System by Henry Greenham - Thu, 28 Aug 2014 11:09:15 EST ID:zp5ivIRS No.6461 Ignore Report Reply Quick Reply
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Hey /tesla/

2nd year Civil Engi student here. I'm balls deep in an assignment for a Water Systems unit taught by some Indian guy. His english isn't too great and there's often small spelling errors in his lecture material and sometimes equations.

In this assignment he asks the following question;
"Water is pumped from underground storage the ground reservoir to the network ABCD.
The flow in DC is 15 L/s and C = 100 for all pipes."

My question is what are DC and C?
I'm thinking DC is De-Compressible? I'm not sure and all google searches lead to electrical current, not that of water.

Also not sure what C is either. Any help appreciated.
Henry Greenham - Thu, 28 Aug 2014 11:14:22 EST ID:zp5ivIRS No.6462 Ignore Report Quick Reply
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Fuck I'm stupid. Just realised DC means the pipe connection between D and C. Sorry guys. Still not sure what C could be. NB. LIKE IT MATTERS ON TESLA FUCK ME RIGHT? KEK

Motherfucking control knobs by Thomas Baggleworth - Mon, 11 Aug 2014 23:31:52 EST ID:7QLzDrO3 No.6435 Ignore Report Reply Quick Reply
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Why they so expensive?

I was looking for colorful flashy knobs like featured on Build Your Own Clone (who has them for $.60 to $.95 USD each, expensive in quantity..) and thought, man I would love to put some clear knobs on my projects.

Then I looked into acrylic resin and making my own molds and shit. Anyone have experience in this? I basically want to make my own clear acrylic knobs for potentiometers. (but it seems like a useful skill to have for other applications too.)

HOWEVER, I also read about getting some acrylic cylinders like the pic related and hitting them with a "set screw" and putting a piece in there but I could not find anything for my potentiometer to use. They're not the ones with a flat side or even an indention for a flat head screw driver..they're just bald and smooth.

But that's neither here nor there.

> Anyone do acrylics and molding and shit and have any advice on getting started?
It seems like it could be fucking useful for making little acrylic parts here and there.

>Would you advise in support of the acrylic cylinders?
I'm handy with the dremel and have all the bits and pieces to do it if need be. But unlike the molding scenario, I couldn't be able to shave down a cylindrical piece of acrylic and keep it's transparency :[
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Phyllis Sunderbork - Thu, 14 Aug 2014 00:25:28 EST ID:7QLzDrO3 No.6438 Ignore Report Quick Reply
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I carved one with my dremmel out of wood. Got some tiny wooden sticks from Lowes. Carved a flathead on one end, and a tiny shaft up the other and stuck it through the hole in the acrylic sheet I put over the buck converter. It worked, but was loose. I think I'm just going to keep using a tuning fork though.

With that said, however, you can safely remove component and replace it with a potentiometer of equal resistance. Like so (this is what I made in the pic related):
Phyllis Sunderbork - Thu, 14 Aug 2014 00:43:45 EST ID:7QLzDrO3 No.6439 Ignore Report Quick Reply
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I just realized I said tuning fork and I don't remember if that's the official name or just something we called it. It's what we called them in the military when I was a radio tech. We'd call them tuning forks because, quite literally, we tuned frequency filters, amplifiers, and hetrodyning components on radio boards.

Pic related, "tuning screwdriver" also brings pictures of what I'm talking about. Usually the handle is all plastic and only the tiny flathead tip is metal so that you can safely tune components on live boards.

Properfags who only want to do shit properly would tell you to use this on that potentiometer type but a small screwdriver like in a prescription glasses maintenance kit will work fine too.
Ernest Bromblecheck - Sun, 17 Aug 2014 19:53:52 EST ID:HF5RlaE4 No.6447 Ignore Report Quick Reply
I usually just get the best I can find on ebay, those are $14 for a 48x22mm solid aluminium knobs and they look awesome on amps. If you want clear ones it looks like you'll really have to mold them yourself - I could only find one ugly model on ebay but perhaps they're out there somewhere. If you decide to go full DIY, remember that you need some way of fastening the knob to your pot. I recommend making a mold of the size you want and having some kind of insert that will accomodate for the 6mm pot knob as well as the fastening screw. I guess your best bet is to use 6mm thick plastic, threading it with your preferred thread size, turning a screw into that thread and using that together with the mold (you'll need something to center it in the mold). I hope that was clear enough, if not I can invest 9001h in paint and make some drawings for you.
a bunch of other places sell the same thing, just google "bourns trimpot tool" and you'll find them. I bet you could find a cheaper offering, but $2.80 is already pretty good. There's a bunch of other kinds but the ones I've seen are just glorified plastic screwdrivers - what you want is a tool that has the blade recessed into the body like the one I linked to so you don't slip off the trimpot while turning. Takes some fiddling to get it into the slot, but once it's in you can safely turn it with no danger of slipping.

Betsy Duzzledon - Wed, 20 Aug 2014 07:46:03 EST ID:+nETLFaO No.6450 Ignore Report Quick Reply
"bourns trimpot tool"
Thanks ! now i know what to look for
Nicholas Clockleforth - Fri, 22 Aug 2014 20:08:50 EST ID:mhOkUYJD No.6456 Ignore Report Quick Reply
OP, I just googled this to see whether it's a thing, and apparently it is:
You could use the acrylic cylinders and then polish the surfaces where you cut them to get back the shine and transparency - I guess you'd need to get a pretty straight and neat cut in the first place if you want it to look nice though. You could also use some fine-grit sandpaper first to get it almost perfectly smooth so you don't have to polish too much if your cuts don't leave a nice surface. You're gonna need to wet sand it if you go that route, so make sure to use waterproof sand paper and get a decent variety of grits including some very fine ones - sanding is much easier and faster than polishing, and 5000 grit sandpaper leaves a surface that's almost perfectly smooth to the touch so you'll have it smoothed out nicely with a few runs of polishing.

is this the right board for this by Nell Niggershit - Thu, 21 Aug 2014 21:30:45 EST ID:h4yAb3hN No.6451 Ignore Report Reply Quick Reply
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Genetic engineering or gmos. I'm writing a research paper about why we need gmos. I can't find any evidence that they pose a risk to anything. Lots of studies show they are fine. Who funds the studies though. A lot seem to be from independent scientists but i dunno. Can we discuss this here? or should I take it somewhere else?
Nicholas Dartwill - Fri, 22 Aug 2014 00:29:05 EST ID:R8Jeo5Vp No.6452 Ignore Report Quick Reply
I would take this to the future's /sci/ board. its faster than this board.

Personally I do not have any citable info for you.
Nell Niggershit - Fri, 22 Aug 2014 03:12:11 EST ID:h4yAb3hN No.6453 Ignore Report Quick Reply
Nell Niggershit - Fri, 22 Aug 2014 17:09:25 EST ID:h4yAb3hN No.6454 Ignore Report Quick Reply
i hate 4chin though.
Nigger Bluckleford - Fri, 22 Aug 2014 19:58:05 EST ID:mhOkUYJD No.6455 Ignore Report Quick Reply
Honestly it's better than people on here act. For some reason, 420chan seems to have some kind of edgy aversion to the future. There is of course much more shitposting over there, but there are also some very knowledgeable and chill people on some of the boards. /sci/ is a prime example of both - there's about a million IQ threads and tons of "0.999...=1" shit every day, but there are also some math PhD students who really know their shit and a bunch of smart people from other fields. It's all a matter of sifting through the shit I guess, and I can understand if some people can't be bothered.

Either way, if you post a good, well-thought out question on /sci/ that doesn't have a readily google-able answer, you've got a decent chance of getting some good responses (and a 99% chance that there will be some bad shitposting).

On 420chan, I'd say this question would be better suited to /chem/ - "genetic engineering" isn't really what I'd consider actual engineering, it's an application of biochemistry/genetics. /chem/ has the added benefit of being a bit faster than /tesla/, too. I think this is one of the slowest boards on the whole site.

How to lock this? by Henry Blathercocke - Mon, 18 Aug 2014 14:36:46 EST ID:GzT+uX5m No.6448 Ignore Report Reply Quick Reply
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I am trying to work out how I can make this briefcase/laptop case lockable. There are two holes that are 1cm in diameter at the top, they are 3.2cm apart and there is a hinge for the second hole as shown in picture. It may not be possible; but I figured I'd see if anybody else's brain could ponder up an idea.

If it's not really possible; any other locking solutions? I don't have access to powertools!

Thanks very much /tesla/.
Nell Honningpudge - Tue, 19 Aug 2014 21:18:22 EST ID:HjAq4KwX No.6449 Ignore Report Quick Reply
Buy a padlock, drill some holes in it and screw in a latch

re: Engineering is super hard work? by Edward Pittlock - Fri, 08 Aug 2014 05:49:54 EST ID:iQlMHuxK No.6430 Ignore Report Reply Quick Reply
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I've considered becoming an electrical engineer, but my friend seemed to think that I wasn't cut out for something like this. Is engineering in general, super hard work? Are there certain personalities that do well with this than others?

Is there some reason why I couldn't be an engineer?
Is there a clever analogy you can compare being an engineer to?
Barnaby Pebberkire - Fri, 08 Aug 2014 23:49:10 EST ID:01krkNKo No.6431 Ignore Report Quick Reply
I hope you love math.
Oliver Surringnane - Sat, 09 Aug 2014 04:57:33 EST ID:JbW9OILc No.6432 Ignore Report Quick Reply
Who could possibly hate math? What else?
Augustus Gemmledock - Mon, 11 Aug 2014 21:23:23 EST ID:nRiN09B6 No.6434 Ignore Report Quick Reply
Did you do well in high school, particularly math and science? I don't care how smart you think you are just if you did all your homework and got good grades.

Are you good with working with your hands?

Are you OK with spending a lot of time studying?

Are you OK with classes with terrible male:female ratios?

If you answered yes to all of those, then do it.

>Who could possibly hate math?
Most human beings. Seriously though I have a good friend who often says how he loves science and sometimes math. In reality he just knows neat physics concepts but can't explain or prove anything. If he really enjoyed science he'd pick up a textbook and learn something, but he doesn't. He just likes feeling like he's smarter than people he isn't.
Cedric Sondleham - Thu, 14 Aug 2014 14:46:19 EST ID:EyqApq5P No.6441 Ignore Report Quick Reply
>Is engineering in general, super hard work?
one of the most difficult faculties
>Are there certain personalities that do well with this than others?
people who like maths and can study a lot of hours with no problem and already know how to do so since high school.
>Is there some reason why I couldn't be an engineer?
if you study and yet don't get good results in the hard subjects in high school, then it's going to be difficult.
If you haven't tried applying yourself strongly in high school already, you have a motivational problem already.
>Is there a clever analogy you can compare being an engineer to?
engineering is suffering under the whip and asking for more because you want it.

broken egg by John Pungerstat - Tue, 12 Aug 2014 07:02:10 EST ID:gIZNaa5b No.6436 Ignore Report Reply Quick Reply
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i posted this somewhere else a moment ago but figured here might be better. i got a vibrating fleshlight in the mail and took both ends off with haste. what i didnt realize is that the egg is attatched to the ventilation cap, and i ended up detatching the wires from the top. im also completely ignorant when it comes to wiring. is there a simple way i can fix this?
Basil Desslelodging - Thu, 14 Aug 2014 14:39:24 EST ID:zCR9OQf3 No.6440 Ignore Report Quick Reply
i don't know dick either, but i would guess either try soldering it and/or using electrical tape where needed, you could also add more wire to connect to whatever was disconnected.. i would think the added length would make it a bit easier to get in there
Walter Blackwill - Sat, 23 Aug 2014 09:26:22 EST ID:P1FecDgQ No.6457 Ignore Report Quick Reply
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>i would think the added length would make it a bit easier to get in there

magnet motors by Ian Siddlechan - Tue, 17 Jun 2014 17:16:38 EST ID:oAxeGcm1 No.6364 Ignore Report Reply Quick Reply
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Why don't magnet motors work

I have no idea about the physics and science behind it but i'm curious.

I'm just trying too learn something, please don't be mean too drunk little me
1 posts omitted. Click Reply to view.
Polly Chasslehall - Thu, 19 Jun 2014 01:58:51 EST ID:01krkNKo No.6366 Ignore Report Quick Reply
Some of them do work, but it demagnetizes the magnets, so they don't work forever.
Nigger Gollyhall - Sun, 20 Jul 2014 12:37:07 EST ID:5gD9lQi4 No.6412 Ignore Report Quick Reply

This seemed an appropriate time to share this
Reuben Poshshit - Sun, 20 Jul 2014 13:53:15 EST ID:FyDQ8lW0 No.6413 Ignore Report Quick Reply
Ebenezer Dettingford - Mon, 21 Jul 2014 00:09:13 EST ID:XObDUDiZ No.6414 Ignore Report Quick Reply
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My understanding of motors is they are based on an oscillating current. There are 3 plates connected to 3 coils on the inside and 2 brushes on the outside. When it spins the brushes always touch 2 of 3 plates and the 2 it touches keeps changing. That creates a current that oscillates back and forth in polarity, which in-turn will oscillate the magnetic field in the 3 copper coils. That creates a balance of attraction and repulsion against the 2 magnets on the outside so it works. Magnet motors have no current and therefore lack that oscillation, which is essential to keep it spinning indefinitely.
Archie Gackleforth - Mon, 28 Jul 2014 21:40:49 EST ID:J0zfKXTE No.6422 Ignore Report Quick Reply
What? I work with permanent magnet motors.

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