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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.

How? by Martin Sepperridge - Fri, 14 Jun 2013 00:31:06 EST ID:3jq8QS32 No.5749 Ignore Report Reply Quick Reply
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I saw this gif in /pol/ and I was wondering how does it even work?
Sidney Sunningstutch - Fri, 14 Jun 2013 00:58:48 EST ID:WrkcMEA2 No.5750 Ignore Report Quick Reply
When the switch is turned on, AC electricity from the wall outlet is converted to DC through a transformer and bridge rectifier. The DC voltage causes current to flow through a light emitting diode and current limiting resistor, causing the diode to emit a soft blue light.
Ernest Snodwill - Fri, 14 Jun 2013 02:31:37 EST ID:84WsgVqj No.5751 Ignore Report Quick Reply
Basically what Sydney said, it's electronic snake oil.
Basil Gucklepodge - Fri, 14 Jun 2013 12:21:34 EST ID:qmmmZXt+ No.5753 Ignore Report Quick Reply
It kind of works if you're using it like guy in the gif; save electricity by blocking your power outlets
Walter Buzzfield - Tue, 25 Jun 2013 02:43:42 EST ID:EbmglSmN No.5766 Ignore Report Quick Reply
How to reduce energy costs:

Step 0: Don't be retarded.

Step 1: Use higher voltage mains. I switched from 120 to 230v, big improvement.

Step 2: Increase power factor.

Step 3: HVDC LED lighting is stupidly efficient.

Step 4: Solar water preheating for hot water.

Step 5: Solar thermal power - because photovoltaic is not as cool as steam engines.

Lathe Reaming by Isabella Sunkinfat - Mon, 08 Apr 2013 12:22:00 EST ID:gdeb+MXi No.5553 Ignore Report Reply Quick Reply
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Don't know if there's anyone here who took the apprentice route into engineering but il ask anyway, occasionally when reaming a hole using a lathe the hole ends up a few thou' oversize e.g a 1/2" reamer producing a 0.504" hole and i dont know why because the reamer seems to be in good condition
1 posts omitted. Click Reply to view.
Betsy Nublinghood - Mon, 15 Apr 2013 20:22:33 EST ID:EWvw2Li1 No.5568 Ignore Report Quick Reply
your work may not be sitting exactly flat on the collet. make sure there's no burrs on it (or the part itself) when you clamp it down. What are your feed/speeds like? material? Like the above poster said, a slower speed might help.
Betsy Nublinghood - Mon, 15 Apr 2013 20:23:09 EST ID:EWvw2Li1 No.5569 Ignore Report Quick Reply
also make sure the part is getting enough coolant
some guy with opinion - Fri, 26 Apr 2013 14:42:36 EST ID:IODwa9Nn No.5600 Ignore Report Quick Reply
is the lathe sitting on complete level ground? also try finding a good speed if its to slow it will heat up fast resulting in overusing coolant, just pay attention to the speed and the color of the metal, make sure its fairly clean of burs and don't speed up slow down whilst in motion.. test an offcut before you find the correct drilling speed
some guy with opinion - Fri, 26 Apr 2013 14:46:57 EST ID:IODwa9Nn No.5601 Ignore Report Quick Reply
i can post a similar picture to you from my engineering book for you if that will help?
Cyril Fimblehood - Thu, 16 May 2013 06:38:28 EST ID:kz85WsFR No.5653 Ignore Report Quick Reply
could the reamer be 2 thou of centre?

Civil Engineering by maths bro - Thu, 02 May 2013 02:54:44 EST ID:+31F/aYC No.5607 Ignore Report Reply Quick Reply
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CivIl Engineering worth while? is there a high demand for Civil Engineers?
if not, what discipline of engineering is most sought after?
Martha Grimcocke - Thu, 02 May 2013 13:56:50 EST ID:buTeoEHV No.5610 Ignore Report Quick Reply
Check out the post about the job market below.
I don't know how accurate that is to your area, but I've heard out of all the engineering disciplines, civil and architectural are among the least in demand.

As far as highest in demand, I would probably say EE or ChemE? I'm probably a little bit biased being EE though.

Do what you want though, they can all have fairly good hire rates, and it's tough to make it through four years of engineering if you don't like what you're doing.
I spent 12 hours yesterday on a project but I don't mind because I love doing it.
Hannah Honeywell - Thu, 02 May 2013 13:58:27 EST ID:Jr33UkvF No.5611 Ignore Report Quick Reply
every sort of engineers really.
I`m currently on an internship in a mechanical engineering company (I design bridges and other large metal constructions) and there`s a great shortage of people who calculate bridges. appareantly no-one wants to do that shit and the people who do it get payed fuckloads and get their dicks sucked by companies to get them working for their company. I really couldn`t care less about calculating that kind of stuff for a job so I won`t be doing that kind of stuff.
hope this helps.
ps; bridge design is sort of civil engineering and mechanical engineering combined.
Trynd - Tue, 07 May 2013 03:44:52 EST ID:N4X3qNBZ No.5627 Ignore Report Quick Reply
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Electrical Engineers are in very high demand. For ME's and EE's, only a Bachelor's Degree is required.

There will always be a demand for Water Resources in every community for Civil Engineers. Environmental Engineering is also on the rise.

I heard that for Civil, you're more inclined to get a Masters Degree
Civil Engineering demand is lower in the U.S. at the moment because of the recession, but US Infrastructure is in desperate need of repair.
Forecast: Govt infrastructure (Transportation, Structures, Bridges, Dams, the works) and Environmental Engineering demand ahead

Civil Engineering requires more years of experience for a job.

Honestly, go for what interests you the most.
If you really enjoy Math, go for Electrical Engineering or Computer Science
Manufacturing, Vehicles, Aerospace and Thermal systems (Heating and Cooling ) ----> ME

Bridges, Construction, Water systems, Dams, Pipes, Highways, Environmental---> Civil
I chose Civil Engineering because I enjoy working outside (EE's spend most of their time indoors). Water Resources and Environmental Engineering interests me because they are essential to maintaining a sustainable community.

engine swap not sure how to do. by Fuck Cipperwater - Sun, 12 May 2013 09:40:01 EST ID:mOTxuWnQ No.5644 Ignore Report Reply Quick Reply
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how can fit a 347 cobra engine into my 04 saab aero.? i have plenty of tools for metal works but i dont work on cars.
2 posts and 1 images omitted. Click Reply to view.
Cyril Blackhall - Wed, 22 May 2013 14:57:03 EST ID:+1J9rO3X No.5685 Ignore Report Quick Reply
and a crance for the crane
Sidney Bemmleson - Sat, 01 Jun 2013 02:01:30 EST ID:1SGEhppQ No.5708 Ignore Report Quick Reply
I have a feel it wouldn't fit. mustangs are generally rear wheel drive and I would bet your saab isn't (not looking it up idgaf).... you've gotta pack a transaxle under your hood, in addition ot the engine.
Alice Wangerkure - Sat, 08 Jun 2013 17:37:09 EST ID:32CcdVZd No.5725 Ignore Report Quick Reply

Its not going to happen. At least, not without serious unibody work. If you just want to go faster op get a 3-inch exhaust and a reflash for the computer, it will be much faster.
Henry Gunningnedging - Mon, 01 Jul 2013 16:31:59 EST ID:+XFainEW No.5779 Ignore Report Quick Reply
>not a small block
Simon Dottingbune - Tue, 02 Jul 2013 02:27:11 EST ID:BSkmKEqx No.5780 Ignore Report Quick Reply
Not really...

But you are gonna need a crane because that shit is heavy.

Advice by Augustus Sillersuck - Thu, 16 May 2013 00:43:25 EST ID:COqBFVmZ No.5652 Ignore Report Reply Quick Reply
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I hate to be that guy but I could really use any advice pertaining to the construction of bridges. We have a competition in my AP Physics class for the most efficient bridge made out of balsa wood and my gpa basically rests on this bridge, as it is the final. I was thinking of creating a warren truss with an arched top and horizontal planks for support of the roadbed, and was just wondering if anyone could give me a step in the right direction. Thanks in advance :)

Pic is close to what I intend
Wesley Girringkod - Fri, 17 May 2013 12:08:10 EST ID:ji69B8v/ No.5656 Ignore Report Quick Reply
look up the gothic arch, they're difficult to construct out of balsa, but if you make an effective jig to form it, they can be insanely strong.

I made a 2' tower out of balsa using 4 gothic arches, and it held 136lbs. it weighed less than an ounce.
Wangdang Poontang - Wed, 22 May 2013 20:33:56 EST ID:NGtyNLow No.5687 Ignore Report Quick Reply
Back in my day, all the fancy suspension style bridges made of balsa for this test failed miserably. It's a great design with heavy materials IRL, but doesn't scale well to a brittle wood. The design that held the most while still remaining light was basically a straight mimicry of cardboard, plain and simple.

Sand Castles by Dig-dug - Tue, 26 Feb 2013 14:12:50 EST ID:jomR4p6U No.5444 Ignore Report Reply Quick Reply
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Make me a sand castle worthy of /tesla/
Clara Sallershaw - Tue, 26 Feb 2013 22:46:56 EST ID:LovN/bXl No.5446 Ignore Report Quick Reply
Dude, it's February. nb, but this post will probably still be on the front page by the time it's relevant.
Cyril Chivinghutch - Sat, 02 Mar 2013 16:31:35 EST ID:mUoK63lK No.5459 Ignore Report Quick Reply
nigga cannot into hemispheres
John Blenderson - Fri, 28 Jun 2013 18:40:00 EST ID:mCS3dD2d No.5770 Ignore Report Quick Reply
bump because it's summer

Movies for /tesla/ by John Clinningdeck - Thu, 27 Jun 2013 10:28:34 EST ID:PRaZ2bar No.5767 Ignore Report Reply Quick Reply
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Well. One movie and one radio play.

Transatlantic Tunnel

No Highway In The Sky
Jimmy Stewart and Marlene Dietrich in a story about metal fatigue.

Magnets & Rubber by Jack Semmleseck - Wed, 20 Mar 2013 03:21:25 EST ID:agDbbcwS No.5499 Ignore Report Reply Quick Reply
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Comment Is it possible to construct a magnetic-rubber compound that maintains properties of both materials? The possibilities for those properties seem interesting when put together. The most obvious use would be toys, but there could be other, more practical uses. Or it could just end up staying a toy like silly putty.
Has something like this even been invented? What are the practical uses?
Hannah Divingspear - Wed, 01 May 2013 17:44:37 EST ID:f7vl+q0O No.5605 Ignore Report Quick Reply
refrigerator magnets are rubberized.
Hannah Honeywell - Thu, 02 May 2013 14:01:04 EST ID:Jr33UkvF No.5612 Ignore Report Quick Reply
is a good example, but can`t think of any practical uses except that one and toys
Cedric Chassledale - Fri, 03 May 2013 23:13:23 EST ID:gEA88Fhy No.5618 Ignore Report Quick Reply
Month old thread but still on the first page so whatever. Why not a type of piezoelectric like material? Apply a current, it contracts. If you had a springy enough rubber mixed with strong enough current and electromagnetic material, you might be able to get some macro sized contractions.

the great 3D CAD/CAE battle by Hannah Honeywell - Thu, 02 May 2013 14:17:06 EST ID:Jr33UkvF No.5613 Ignore Report Reply Quick Reply
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so /tesla/
I have a few questions for you.
what kind of 3D CAD/CAE program(s) do you use?
what are the pros/cons of that particular program?
what kind of work do you do? (mechanical eng/civil eng/electrical eng/product design/what ever)

I`ll start:

I use Autodesk Inventor

pros are that it prettymuch has everything you need for mechanical engineering
cons are:
its that it`s expensive as fuck
>inb4 pirate that shit
you can`t if you actually work with it professionally. Autodesk does random RL checkups on companies and you`re fucked if you aren`t certified.
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Hamilton Sirrydock - Fri, 03 May 2013 00:26:50 EST ID:AInfxL6X No.5614 Ignore Report Quick Reply
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senior mechanical engineering student
I mostly use ProE/Creo because that's what the school has licenses for. in addition to a small donation, solidworks sponsored my senior design team with a set of student licenses so I've played with it a little bit, but not as much as i'd like because I had to submit my models in creo format and every time I tried converting a part from one to the other it wrecked my datum planes and assemblies.
creo seems a bit more intuitive for modelling but that may just be from asymmetric experience. FEA in solidworks ran significantly faster and was much easier to set up.
I mostly do design work with some FEA.
never used a 3d mouse, ill have to try one when I have the money for it.
Frederick Dacklefat - Sat, 04 May 2013 21:51:45 EST ID:mSiCExQ8 No.5619 Ignore Report Quick Reply
When I was in high school, I got to take a class that showed us how to use Autodesk Inventor. It's a very powerful program that's not too tough to use (but yes, unless you are a student, it is *crazy* expensive!) We also learned how to make lots of neat things using programmable CNC machines. Since my job has nothing to do with anything like that, I've pirated Inventor and have made some simply little toy things using designs that I send to various machine shops. Usually the stuff comes back neat! However, I know that if I were to ever get serious about using this tool to produce any significant quantity of product, that I'd have to pay the price :(

one-wheeled scooter by Oliver Brannershaw - Mon, 10 Jun 2013 07:44:10 EST ID:Mu5K07UT No.5739 Ignore Report Reply Quick Reply
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Engineering a backyard forge. by Archie Breffingsut - Sat, 11 May 2013 12:37:51 EST ID:++Jn5hyH No.5636 Ignore Report Reply Quick Reply
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So for the past couple weeks I've been interested in blacksmithing, so in my attempt to start I've managed to make a half ass'd furnace out of a camp fire pit in my back yard. It works well enough to heat the iron to a nice workable temperature. I was wondering if anyone has pictures of ideas of a brick built fireplace that has a proper air intake to reach optimal temperatures easier.
Archie Breffingsut - Sat, 11 May 2013 12:39:42 EST ID:++Jn5hyH No.5637 Ignore Report Quick Reply
I'm planning on using a shop-vac on a blowing setting as my bellows soon for my next iteration of the design. nb
Rebecca Nindleshit - Sat, 11 May 2013 23:16:16 EST ID:f7vl+q0O No.5642 Ignore Report Quick Reply
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There are a couple of ways to go about this. you can either make a charcoal/coke forge, or a propane forge.

I highly recommend propane, although it's slightly more difficult to build. it still only takes simple plumbing parts, a bit of welding, and an empty propane tank.

if you go for the solid fuel forge, then a grill can be pretty easily modified into a workable forge, or even a brake drum can be effective, but you'll need to buy/make a blower.

here's an idea of a gas forge

this one is better

here's an idea of a simple charcoal forge.
Comment too long. Click here to view the full text.

Oh shit lol by Graham Fussletitch - Mon, 29 Apr 2013 13:03:31 EST ID:na3H4o6F No.5604 Ignore Report Reply Quick Reply
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This is like a Boys Own Spectacular Suicide manual.
No, seriously, how bad an idea is this?
Doris Burrymodge - Sun, 05 May 2013 02:38:04 EST ID:1/RGVUTh No.5621 Ignore Report Quick Reply
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i dont know OP why don't you find a nice, high cliff, give it a shot and report back with pictures your death.
Betsy Cinningfut - Mon, 06 May 2013 10:20:57 EST ID:Adk1msWC No.5625 Ignore Report Quick Reply
Fuck you, you shitposting faggot.
Faggy Snodville - Mon, 06 May 2013 14:06:49 EST ID:U05tYzlp No.5626 Ignore Report Quick Reply
I hate this age where you have to be a fucking certified genius to legally build a toy of wood twine and tarp

Stop being a pussy OP
orville wright - Sun, 12 May 2013 21:00:14 EST ID:mCS3dD2d No.5646 Ignore Report Quick Reply
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do it, but with a 2hp motor and a prop.

jolly good fun.
Samuel Hunderwidge - Sun, 19 May 2013 12:16:34 EST ID:t6Yu9g/A No.5668 Ignore Report Quick Reply
Careful, you could land on these assholes.

Two long poles and some heavy cloth? (everyone runs away) OH WAIT

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