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- Thu, 16 May 2013 00:43:25 EST COqBFVmZ No.5652
File: 1368679405255.jpg -(48257B / 47.13KB, 605x453) Thumbnail displayed, click image for full size. Advice
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 ji69B8v/ No.5656 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 NGtyNLow No.5687 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

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- Tue, 26 Feb 2013 14:12:50 EST jomR4p6U No.5444
File: 1361905970443.jpg -(48569B / 47.43KB, 334x332) Thumbnail displayed, click image for full size. Sand Castles
Make me a sand castle worthy of /tesla/
Clara Sallershaw - Tue, 26 Feb 2013 22:46:56 EST LovN/bXl No.5446 Reply
Dude, it's February. nb, but this post will probably still be on the front page by the time it's relevant.
John Blenderson - Fri, 28 Jun 2013 18:40:00 EST mCS3dD2d No.5770 Reply
bump because it's summer

Magnets & Rubber

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- Wed, 20 Mar 2013 03:21:25 EST agDbbcwS No.5499
File: 1363764085898.jpg -(24576B / 24.00KB, 360x360) Thumbnail displayed, click image for full size. Magnets & Rubber
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 f7vl+q0O No.5605 Reply
refrigerator magnets are rubberized.
Hannah Honeywell - Thu, 02 May 2013 14:01:04 EST Jr33UkvF No.5612 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 gEA88Fhy No.5618 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

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- Thu, 02 May 2013 14:17:06 EST Jr33UkvF No.5613
File: 1367518626808.jpg -(59884B / 58.48KB, 720x315) Thumbnail displayed, click image for full size. the great 3D CAD/CAE battle
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.
requires you to update every year if you are active on the market
it has such complicated functions that you can fuck everything up in a few seconds and never get it right again.

I work in mechanical engineering
I do:
product design (drawing/design shit)
engineering (calculating and shit)
make production drawings (3D designs --> 2D drawings to make shit)

also; what`s your opinion on 3D mice?
I can`t imagine working without one anymore. those things are so frickin useful and awesome
Hamilton Sirrydock - Fri, 03 May 2013 00:26:50 EST AInfxL6X No.5614 Reply
1367555210323.png -(101139B / 98.77KB, 864x714) Thumbnail displayed, click image for full size.
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 mSiCExQ8 No.5619 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 :(

Engineering a backyard forge.

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- Sat, 11 May 2013 12:37:51 EST ++Jn5hyH No.5636
File: 1368290271761.jpg -(780831B / 762.53KB, 1024x768) Thumbnail displayed, click image for full size. Engineering a backyard forge.
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 ++Jn5hyH No.5637 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 f7vl+q0O No.5642 Reply
1368328576294.jpg -(41431B / 40.46KB, 512x384) Thumbnail displayed, click image for full size.
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.

keep it up man, blacksmithing is really interesting. look into some online forums, they're a wealth of information. Iforgeiron is one of the best for basic blacksmithing, but if knives are your forte, then head towards bladeforums, or forums.dfoggknives.com

I've been making knives for years.

Oh shit lol

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- Mon, 29 Apr 2013 13:03:31 EST na3H4o6F No.5604
File: 1367255011279.png -(20302B / 19.83KB, 465x748) Thumbnail displayed, click image for full size. Oh shit lol

This is like a Boys Own Spectacular Suicide manual.
No, seriously, how bad an idea is this?
2 posts and 1 images omitted. Click View Thread to read.
Faggy Snodville - Mon, 06 May 2013 14:06:49 EST U05tYzlp No.5626 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 mCS3dD2d No.5646 Reply
1368406814273.jpg -(8325B / 8.13KB, 410x250) Thumbnail displayed, click image for full size.
do it, but with a 2hp motor and a prop.

jolly good fun.

What is an engineering career like?

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- Wed, 29 Aug 2012 05:03:20 EST 7BbcKMod No.4725
File: 1346231000515.jpg -(31278B / 30.54KB, 600x450) Thumbnail displayed, click image for full size. What is an engineering career like?
What is the job of your average engineer like? Do they usually sit in front of their computers all day long? Or is most of their work time dedicated to observing the item they're engineering, and physically assembling it? Or is it something completely different?
23 posts and 1 images omitted. Click View Thread to read.
Ebenezer Bumblewater - Sun, 17 Nov 2013 20:01:58 EST CKZoWqYh No.6004 Reply
Well, I work as a sales engineer and studied EE. I sell induction motors and then we go over with customers, electrical engineering, mechanical engineering et.c. and check what we can do. The starting current needs to be this and that so that the fuse in the ship doesn't blow et.c., this amount of torque on the shaft from this direction.
I work with people all the time. I wish I had a job where I could just look at blueprints or do CAD, program or something. I have to deal with people all the time which can be nice but also god damn exhausting.
Ian Fandock - Thu, 21 Nov 2013 06:46:06 EST G532uIf3 No.6006 Reply
I'm a chemical engineer, working as a process engineer at a refinery (as opposed to say, a chemical engineer working as a project engineer, safety engineer, process control engineer, scheduler, operations manager, master planner, etc.).

Containment is a huge issue so a lot of time is spent making sure things are done and designed safety, and troubleshooting issues. Not sure what you mean by transportation. Refining is old tech so there isn't a lot of new and exciting theoretical work to be done, that said the kit we have on site is fairly technical and you'll likely use all aspects of your eng degree. E.g. you'll rarely be concerned with flammability in food process, and would not often deal with reactors in mining engineering.

Anyway, a lot of time is spent arse covering, adhering to this standard or that design spec, looking at proceduers, staring at trends to figre out what went wrong. Be warned.
Phoebe Winkinpotch - Sun, 29 Dec 2013 01:46:10 EST 8LQeC1rt No.6052 Reply
I do the same thing although I'm no scientist, i like to think that everything that anyone says is an opinion and that they should not be affected by the way that i have come to communicate. maybe i do sound like a huge wankstain, but i at least acknowledge that and assume that they do too.

Cooling systems

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- Thu, 19 Dec 2013 01:24:35 EST wihCcYhm No.6038
File: 1387434275139.jpg -(126389B / 123.43KB, 580x871) Thumbnail displayed, click image for full size. Cooling systems
Some dude on 4chin's /pol/ was talking about polywells, and it got me thinking about cooling systems (I understand if it were fusion you'd need shielding) and it got me to thinking about commercializing highly efficient coolant systems as a buffer to mess with high energy designs. I don't know anything about cryogenics and was wondering if someone could share a book or some experience. Posting some Cambell to set the Scottish mood.
2 posts and 1 images omitted. Click View Thread to read.
Hedda Gucklechog - Mon, 23 Dec 2013 19:32:02 EST N3FDWtpq No.6044 Reply
1387845122060.jpg -(50026B / 48.85KB, 500x446) Thumbnail displayed, click image for full size.
Well I wanted to make a little Stirling engine to cryocool things for funsies.
Made by Scot for Scots.
I wanted to use it in tandem with something like a polywell or a fire to store energy and play with entropy. I figured with a lot of energy and by storing all of it I could fool another system into negentropy at a level that would be useful for computation or propulsion. Hence Tesla. Don't know too much and would like to duke it out with gay engineer students so an interesting conclusion or a direction will be reached. Thanks for responding.
Graham Lightbanks - Thu, 26 Dec 2013 05:41:40 EST QGMAYyAz No.6049 Reply
>Made by Scot for Scots.
Made by a minister for Christians.

DIY vaporizer

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- Sun, 15 Dec 2013 16:03:34 EST ZCeHQwSt No.6035
File: 1387141414993.gif -(115971B / 113.25KB, 640x480) Thumbnail displayed, click image for full size. DIY vaporizer
Hey guys. I didn't really know this board existed, so this might be the perfect place to ask about this.
I'm going to build a vaporizer. But there's one thing I'm having trouble figuring out, and that's the heating element.
I have a round steel piece about a centimeter across that's flat on the bottom and has a cone-shaped hole drilled about a centimeter deep drilled into the top, which I think will be perfect for the bowl piece. So I had the idea to wrap a heating element around this metal piece, put a thermistor on the bottom so it can keep the temperature constant, and then the herb goes in the top.
Problem is, I'm having a lot of trouble finding nichrome wire that's insulated that I can wrap around the metal. Unless I buy a huge quantity of it, I can't get any.
I was able to find this but unfortunately it's out of stock. Does anybody have suggestions for alternatives, or an idea where I can find some of this stuff?
Like this one in the picture, it'll have a glass jar over the bowl piece that collects the vapor. What do you think?
M - Wed, 18 Dec 2013 13:23:21 EST 06ISvFUq No.6037 Reply
If I remember correctly, the ideal vaporizing temperature is around 185/195 C. maybe you could try to put something of a heatresistant plastic around it, so you`d coat the metal piece instead of the wire. but you`d have to make sure the wiring wouldn`t touch itself.
Graham Cronkinfuck - Sat, 21 Dec 2013 04:14:40 EST NSiYlbXO No.6042 Reply
this seems like a bad idea and not very accurate on temp,

id scrap this idea, it sounds like you're going to end up shorting out.

get a soldering iron a potentiometer and some sort of tray that will be attached to the healting element,

cut on side of the cord to the iron, instal the pot and tape that bitch back up, then you just gotta figure out what to use as a dome and away you go. , good to go.
Samuel Pickledire - Thu, 26 Dec 2013 00:39:42 EST JrIh6TSJ No.6048 Reply
MICA was the answer! I wrapped the steel with thin Mica and then uninsulated nichrome around that. It seems to be very steady on temperature.
Posted about it on /weed/ because this board is quite slow.

Radio waves

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- Sun, 24 Nov 2013 16:29:30 EST YX7KFQhZ No.6010
File: 1385328570742.jpg -(627355B / 612.65KB, 1245x1467) Thumbnail displayed, click image for full size. Radio waves
I use a FM transmitter in my car for music. I've noticed that the reception gets significantly better when I touch the transmitter/cord. I've noticed it on a lot of radio receivers but this is the most relevant

How would your hand be able to change the signal strength so significantly?
2 posts omitted. Click View Thread to read.
Eliza Dammerfield - Mon, 02 Dec 2013 10:51:32 EST W6qmmfPc No.6019 Reply
Yes, I used to do this at an old workplace.
Whitey Pandleson - Sun, 08 Dec 2013 09:26:27 EST bNDsRTY5 No.6028 Reply
Could you design a personal radio to just use your body as an antenna?
Molly Pendlehall - Wed, 18 Dec 2013 00:27:50 EST sueME4Rv No.6036 Reply
Personal radio antennas can already be built so small that they would add less than 1 millimeter to the device itself.

Engineers are dicks

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- Sun, 01 Dec 2013 15:01:21 EST hN+4UAxf No.6016
File: 1385928081077.jpg -(139209B / 135.95KB, 533x800) Thumbnail displayed, click image for full size. Engineers are dicks
im just a blue collar dildo just like everyone else. my job is technical, but it is very specialized. therefore all of my knowledge of this job comes from 9 years of training and trial and error.
why is it that every engineer that i meet have this supiriority complex?
more than half of them that i meet have zero trouble shooting skills. no communication skills. and are generally wrong about every problem they are asked to "solve". and they act like they are to good to try the solutions that us "common workers" already know work.
engineers are dicks. at least every one ive ever met.
4 posts omitted. Click View Thread to read.
Nigger Claydale - Wed, 11 Dec 2013 11:37:45 EST pr0eVUCj No.6030 Reply
Don`t entirely agree on that. People who have an engineering degree should be credible engineers and should have a lot of skill. they just underestimate the skill it takes to actually do shit like welding. there`s companies that don`t have this problem with studid and arrogant engineers because they actually communicate with the people who do the production, and aren`t affraid to learn from them. these companies work a lot better than those who don`t do this shit.
just my two cents
Reuben Muttingsine - Thu, 12 Dec 2013 21:13:17 EST Hf71Bxof No.6033 Reply
Engineers are bros who can do calculus.
Albert Ponkinwill - Fri, 13 Dec 2013 23:00:16 EST 6k26hNyG No.6034 Reply
Looking to get part time degree? might be worth it if you can get scholarship?

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