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Community Updates

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Who are the people who come here? by Jack Smallfield - Fri, 21 Aug 2015 17:13:07 EST ID:QiUAcKGJ No.6780 Ignore Report Reply Quick Reply
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Is it just me that I can't see the icon of this board? Or do we just not have an icon for this board?
And if we don't have an icon for this board, can we submit icons? If yes, to who?
Jack Smallfield - Fri, 21 Aug 2015 17:14:06 EST ID:QiUAcKGJ No.6781 Ignore Report Quick Reply
ignore the stupid title btw.
Reuben Dablingworth - Mon, 14 Sep 2015 11:44:05 EST ID:cymD6AGd No.6792 Ignore Report Quick Reply
Newer boards (such as this one) that weren't around at zero time didn't get an icon. I would suggest a gear if we're making suggestions.

Lasers and fiber optics by George Chinningwater - Mon, 31 Aug 2015 23:48:31 EST ID:xgI+TmTu No.6787 Ignore Report Reply Quick Reply
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Question: Lasers can be fired into a fiber optic wire and travel through without disturbance, what if you were trying to produce heat with said laser at the end of the fiber optic wire? Would oneself be able to place say, a piece of ceramic to absorb the heat of the laser? Would the heat distribute itself fairly evenly?

Just had an idea for a project and am thinking out a prototype design. Help would be appreciated! More questions will follow as well haha
Cyril Fusslebury - Sat, 05 Sep 2015 03:54:00 EST ID:jvhopbea No.6788 Ignore Report Quick Reply
I would imagine a thorough Googling would get you what you want.
From what I've surmised, I think it would depend on the amount of heat the laser is producing. If it's super hot, the fiber optic material could melt. It won't matter too much what the material coating the fiber optic cable is. What matters is the angle of incident reflection and whatnot.

3D Printer by Jenny Blunnerfut - Wed, 15 Jul 2015 16:24:05 EST ID:cy21VhZy No.6739 Ignore Report Reply Quick Reply
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So I was thinking about buying a 3D printer, now that I have a bit of revenue to spend. I want to buy a delta printer for its taller build space, but I'm not sure it's even worth it to buy one at all. I thought it might be fun to produce a bunch of high quality cosplay stuff, which would otherwise take a lot of effort with pepakura, or whatever else, but I don't know what I would make with it other than that. I searched online for things like "Must have for 3D printing" or "Best 3D printed items" to convince myself that it would be worth the money, time and effort that a 3D printer kit requires, but my father brings up the point that I have no real need for one.
TL;DR -Convince me to buy a 3D printer.
4 posts and 1 images omitted. Click Reply to view.
Jarvis Fuckingdock - Thu, 23 Jul 2015 10:22:15 EST ID:9qWH7ZsP No.6753 Ignore Report Quick Reply
Chuffing good suggestion, mate.
Top-hole. I shall investigate some of these hacker spaces post-haste!
Sidney Fablingwater - Thu, 13 Aug 2015 01:47:07 EST ID:m9eqGuJq No.6768 Ignore Report Quick Reply

Have you even attempted to make something by hand in the past several years, without immediately giving up? I honestly cannot figure out why, beyond cool factor, that these simple devices seem impressive to people. The vast majority of people who use them, either make something once or twice with it, that would had been faster to make by an unskilled hand than to prep the data file for the machine, or mass produce garbage that could had been ordered for cheaper and at higher quality from a factory.

You'd get better results commissioning a professional artist for your cosplay stuff, snf providing them with sketches and clear examples of what you want. Just make a craigslist post in the gigs section. If you're not a douche, it should be easier, cheaper, and give you far better results.
Emma Fucklewater - Mon, 17 Aug 2015 19:00:57 EST ID:cymD6AGd No.6777 Ignore Report Quick Reply
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I made a wooden butter knife yesterday, forged a wall hook with my friend the day before that, and I made this papercraft armor last summer. It's still got some details that need some work. (I got impatient and didn't do the bondo part, like that weeaboo noted in the comments)


(Also, they spelled my name wrong)

I just want something that can give me a higher, more accurate level of detail, as well as easier (if slower) construction of difficult-to-manufacture parts and pieces.
Graham Bardville - Tue, 18 Aug 2015 14:19:01 EST ID:m9eqGuJq No.6779 Ignore Report Quick Reply

X_x higher level of detail does not come cheap with these machines. Unless you're spending as much as a new car, expect to do as much work as you did on the wooden knife, on every single part to touch it up, unless there's been a major breakthrough in the past six months of which I am unaware.

Did you find any maker/hacker spaces around, where you can get a peek at the equipment in person? They aren't the miracle machines people make them out to be.
Eliza Chaddlemare - Wed, 26 Aug 2015 21:08:31 EST ID:jvhopbea No.6784 Ignore Report Quick Reply

No, actually I'm on vacation, but I'll have a look when I return. I'm in between jobs atm, so I'm still sorting that out. But there's a company that sells Cartesian and Delta printers that's HQ is like 15 minutes away from my house, so I don't have to pay for shipping, I can just drive down and pick it up. Even with $200-$500 printers, you can expect a decent level of detail, especially for something as large as cosplay pieces. Sanding is probably necessary, but apart from that, it should be ok. Case in point:


I personally think it looks AMAZING at the primer stage, but he must have used shitty paint or something, cuz I think it looks worse when it's completed.

I want to design a bunch of 2d designs to cut out. Is qcad the way I do this? by Henry Bleckleman - Sat, 15 Aug 2015 01:58:36 EST ID:g1t14fVA No.6771 Ignore Report Reply Quick Reply
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Hi all. I am designing a "view camera" (and old fashioned bellows camera like from tarzan) and plan on making it out of cutouts of masonite. I have access to a laser cutter that should be able to cut it out effectively, but I need to provide instructions. I run Ubuntu, and downloaded qcad. am I on the right path?

I want to design a bunch of 2d designs to cut out. Is qcad the way I do this?
Henry Bleckleman - Sat, 15 Aug 2015 02:11:19 EST ID:g1t14fVA No.6772 Ignore Report Quick Reply
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parts for something like this made out of masonite cutouts

Student Project by Charles Siblingchidge - Fri, 19 Apr 2013 21:46:58 EST ID:tgxlgq+7 No.5571 Ignore Report Reply Quick Reply
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So i went away to college to get a Mech Eng degree and shot myself in the foot by fucking around and getting low grades. My GPA was a 1.96 so I decided to transfer to community college to get my shit together. I want to go back to the college i was going to but I need to give them a reason to take me back. So I was wondering if you guys had any ideas on some sort of project i can work on to present to the readmission committee. I have time and the internet and library at my disposal so i should be able to study anything I need I think.
6 posts and 1 images omitted. Click Reply to view.
Edwin Genningforth - Thu, 23 Jan 2014 21:06:41 EST ID:ur5XRX1o No.6103 Ignore Report Quick Reply
tesla was a cool guy
Eliza Semmlefure - Fri, 14 Feb 2014 06:42:16 EST ID:PDTgKfh5 No.6133 Ignore Report Quick Reply
I had a buddy that did this.
You literally just have to right some bullshit essay about how you were stressed at the time you got shitty grades. You're paying them money, not the other way around. They'll take you back, unless you went to a super prestigious university.
Eliza Semmlefure - Fri, 14 Feb 2014 06:42:44 EST ID:PDTgKfh5 No.6134 Ignore Report Quick Reply
sorry for double poast
Doris Gishnotch - Thu, 20 Feb 2014 13:00:27 EST ID:xgUR8wWn No.6151 Ignore Report Quick Reply
Emma Chucklewill - Fri, 14 Aug 2015 19:39:30 EST ID:R6RdkzFB No.6770 Ignore Report Quick Reply
I don't really think a project will mean shit for an admissions advisor. It just makes you look like you are a special snowflake. Just make the grades and reapply.

engineering mom things by mugato - Thu, 06 Aug 2015 03:28:41 EST ID:Oj4vJZ2U No.6763 Ignore Report Reply Quick Reply
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Civil Engineering student here
trying to chose my discipline, its either gonna be construction management or structural engineering.
What choose n why
swallowthesun - Thu, 13 Aug 2015 11:53:22 EST ID:Hvx81WU2 No.6769 Ignore Report Quick Reply
Current PhD in structural engineering here.
I would go for structural engineering if you want to be more involved in the structural systems, consulting or academia. Otherwise I would go for management if you want to supervise a site and do a more construction site/planning engineer type of role.

What would you automate by Angus Cavingbanks - Fri, 09 Jan 2015 15:16:13 EST ID:FbnGM6LP No.6611 Ignore Report Reply Quick Reply
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Hi /tesla/

Do you have any projects you wish you could automate? If you had a magic box you could plug anything into and have all of those things work in concert, what would you plug in?
2 posts omitted. Click Reply to view.
James Clezzledidge - Fri, 16 Jan 2015 05:05:19 EST ID:8210sUos No.6621 Ignore Report Quick Reply
The legal system.
Medical diagnosis.
Tax system.

These are far easier goals than physical things being automated.
Augustus Blackwell - Tue, 20 Jan 2015 02:45:11 EST ID:vaz+up9C No.6624 Ignore Report Quick Reply
College education
If were going to pretend blanket memorization teaches anything
M - Tue, 20 Jan 2015 03:11:03 EST ID:06ISvFUq No.6625 Ignore Report Quick Reply
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Food production
optimising and automating this would probaly be able to get rid of a lot of problems.

And also; not something to automate but this would really help the advance of sustainable power (I mean wind and solar, not biomass): Large scale, cost effective energy styorage. In my opinion this is holding back the sustainable tech the most at this point.
If there are more people around here interested in a sustainable energy discussion please let me know, I`m happy to discuss this topic and hopefully learn something from you guys!
Eliza Trotham - Wed, 29 Jul 2015 00:52:05 EST ID:K5kwUeJd No.6757 Ignore Report Quick Reply

including government, law, even art.

Bow down to your robot overlords.
Sidney Fablingwater - Thu, 13 Aug 2015 01:33:42 EST ID:m9eqGuJq No.6766 Ignore Report Quick Reply

The shower. I would automate my shower. Fuck washing myself. Also, if you don't think this could be industry, people have historically gone to bath houses in many cultures for longer than we have existing records of it. People still pay to use such facilities, even as necessity. Shit, the shower is a bigger motivation for a lot of travelers to get a hotel room than for the bed.

So yeah, bathe me.

The Bong called Excalibur by The Monkey - Mon, 07 Jan 2013 22:29:06 EST ID:8w3o6wlU No.5292 Ignore Report Reply Quick Reply
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Hi 420 chan engineers i'm no engineer myself but i thought i would be a interesting task to see what kind of kool amazing bong this section ( /tesla/) could come up with ?
12 posts and 4 images omitted. Click Reply to view.
Beatrice Pingerbat - Mon, 18 May 2015 08:05:13 EST ID:dRuzcKFh No.6697 Ignore Report Quick Reply
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Graham Forringlot - Sat, 06 Jun 2015 02:09:26 EST ID:Y7Wa8/iS No.6708 Ignore Report Quick Reply
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I had this homebrew phase a few years ago during which I built a three chamber hookah out of a small Pom bottle inverted inside a large Pom bottle.
It was pretty rad, but I was living in a dorm at the time, so it could not last. I'm much better at working with plastic now, so maybe I'll try to recreate it some time.
Phineas Grimford - Mon, 22 Jun 2015 08:24:48 EST ID:nbIafuF3 No.6727 Ignore Report Quick Reply
Put either weed or salvia in one of your nostrils.
Use the other nostril as a carb.
That is all you need to do.
Alice Dillymene - Sun, 05 Jul 2015 12:15:39 EST ID:DKM7qcdl No.6732 Ignore Report Quick Reply



you wanna hit the motor bong?
randomcunt - Wed, 22 Jul 2015 04:52:00 EST ID:xM6kVlrJ No.6751 Ignore Report Quick Reply
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im way too lazy to ms paint a bong design, but ive always wanted to build a laser powered, induction assisted automatic bong with high accuracy pressure and pull speed tuning, but again, lazy

also already high

Literally What is This.... by Samuel Dimmlemane - Tue, 23 Jun 2015 09:17:55 EST ID:1hLD63BV No.6728 Ignore Report Reply Quick Reply
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Literally what is this shit, this is what happens when a professor teaches only the most general fucking cases and expects us to know everything.

I literally don't want anybody doing this for me, I just want to know what direction to head in so I can DO IT MYSELF!!! Just a push in the right direction for how to solve for the temperature profile along the surface.

M - Wed, 24 Jun 2015 05:41:37 EST ID:06ISvFUq No.6729 Ignore Report Quick Reply
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Well first of all, try to find a pdf of 'Coulson & Richardson Chemical Engineering Vol. 6' I`m quite sure there is a pdf hanging around on the 'net of the 4th ed.

Also; I drew something up for your, hope it helps.
and units;
Lambda = W/(m*K)
Alpha = W/(m^2*K)
use meters for the thickness d

If you don`t use SI units, fuck you
Molly Wunkinwater - Thu, 25 Jun 2015 00:28:08 EST ID:a5xmRWEe No.6730 Ignore Report Quick Reply
Rebecca Gugglebury - Tue, 30 Jun 2015 01:18:33 EST ID:hLtC9Ja6 No.6731 Ignore Report Quick Reply
Boundary Layers and Heat Transfer?
I haven't touched the topic in years, but I've uploaded some past work that may or may not be helpful:


Particularly, homework 4

Aspiring EE by Just some guy - Fri, 12 Jun 2015 23:16:43 EST ID:6Ocz9Iwy No.6717 Ignore Report Reply Quick Reply
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Going into uni for EE quite soon, looking for resources to teach myself the very basics of electrical and electronics systems as well as computer science and anything else I might need to know. Basically I'm looking to learn, for now, all I can about the guts of the average house-hold electronic, enough where I can maintain general maintenance and maybe even get a little creative.

What else should I be studying like hell before I get into school that will prepare me, the basics of EE if you will?

Pic unrelated.
Archie Peshmick - Thu, 18 Jun 2015 03:37:19 EST ID:wkP1uJT6 No.6720 Ignore Report Quick Reply
You can look up those sites that teach you all about circuits to get a very basic background. Look at the books that universities are using (most have public facing class pages) and use those books to teach yourself as well as online videos. You'll be looking to learn in the EE department: physics, electrical circuits (using mostly passives except op amps), electronics (getting into transistors), signal integrity (if you want to mess with high frequency PCBs), and probably some other stuff I'm forgetting (which you should look at a university curriculum to fill in. On the CS side you need to start learning a language and in the case of embedded programming you'll want to focus on C and assembly (but don't worry too much on assembly yet unless you just want to do x86 and ARM). Get a good understanding of computer architecture and how to work boolean algebra and design things with gates (basic digital logic stuff). Move on to Verilog/VHDL and work with CPLDs and FPGAs if you want to get into custom ASIC work. Learn a real high level language like Python to help you make useful applications that don't need high performance.
Ian Fevingstirk - Mon, 22 Jun 2015 03:24:43 EST ID:g0vSwCXV No.6724 Ignore Report Quick Reply
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MSEE (to be) here. Browse these at your leisure.

Phineas Grimford - Mon, 22 Jun 2015 08:22:53 EST ID:nbIafuF3 No.6726 Ignore Report Quick Reply
Learn how to write drivers for low level devices and how to program AVRS
It sounds fucking awful, and I'm not going to lie to you, it kinda is, but it's something that they're not going to teach you how to do very well, and something that you're fucking going to need to do more than anything else ever.

li-fi to the next level by Esther Gezzlefadge - Fri, 19 Jun 2015 19:56:15 EST ID:JKp7jUDw No.6722 Ignore Report Reply Quick Reply
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fiber optics are already being used to transfer data but not every machine can be directly connected amirite?
so similar to wi-fi and such is it possible to utilize light in the same manner? like specific wavelengths transmitting to a device that would decode it as binary -

in a bigger scale - would it be possible to construct a massive device that could be thrown into space and transmit a binary.. like a star flickering - we're transmitting radio waves into space right?
would this not work? - also, though i don't know much about what i'm talking about
i think lasers would also be able to do the same, though it would take a precise calculation and such.. but say we sent a satellite somewhere like Saturn and fixed it with a device that would transmit the data back to a receiver with a laser transmission i'm sure it could be done...
just trying to think like aliens - i mean.. imagining that aliens are super far from each other and they have to communicate - light is the fastest known thing so.. i would think that transmitting data in this manner would be the best and fastest way...
Phyllis Sippernore - Sun, 21 Jun 2015 00:35:13 EST ID:FJ+CwDYK No.6723 Ignore Report Quick Reply
Any electromagnetic wave travels through space at the same speed as light. So in terms of latency, light communication isn't any faster than normal radio communication that we use today. However, optical communication does provide way more bandwidth than radio. Because light has such a short wavelength, a lot more information can be crammed inside a given time frame.

Getting it to work over long distances is a challenge because it takes a lot of power to generate a light signal strong enough to be detected really far away, and the beam must be focussed at the receiver. Technology is starting to catch up to where we can use optical communication at further and further distances:

Phineas Grimford - Mon, 22 Jun 2015 08:21:12 EST ID:nbIafuF3 No.6725 Ignore Report Quick Reply
There's an interesting research paper about this put out by Disney (Yes, that Disney) about specifically this.
You see, an LED is not only an transmitter, but also a receiver, as there is a slight but still there change in resistance when it receives light input of specified bands, usually split by the plastic coating on it.
Hence you can image that if you were to adapt a device to receive and transmit using only one LED, then you could have two of these devices, and do an I2C style master slave transmission routine, that scales up to an arbitrary amount of devices.
I think they get like, 8kb per second over a tiny ass range, but it just werks though.

(Warning, this will start talking at you without any input, so be aware)

Electric Bike Battery by Fuck Chushmin - Mon, 23 Mar 2015 14:26:44 EST ID:bEWGmaWL No.6671 Ignore Report Reply Quick Reply
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I hope this is the right board for this thread. Basically I forgot to put my electric bike battery into my car before driving off after a ride the other day and managed to reverse over it in a fit of idiocy, cracking the lower part where the battery connects with its cradle on the bike, as seen in the image. It worked intermittently afterwards, cutting out after bumps for a few seconds and otherwise working fine. Now I have opened it up and managed not to electrocute myself, I have discovered there are two loose wires and no other visible damage, which leads me to believe the whole thing can be salvaged (which is good as they are hideously expensive).

What I need to know from you guys is 1) Where does the loose red wire hanging down above the pack itself go? I think it might attach to the other side of the fuse but I am not sure

2) how should I attach the other red wire to the fuse (one with the coil)? What is the purpose of the coil? can I just solder it on?

Thanks in advance for your help, and my apologies for the triviality of this issue, I think my guesses are probably correct but I don't want to make any mistakes and ruin the whole battery.
Nicholas Briffingstock - Mon, 23 Mar 2015 18:05:01 EST ID:7JSxEYqU No.6672 Ignore Report Quick Reply
Eh, I'd google for plans or repair guides for this specific model of battery.

That 'coil' looks like a crooked contact spring to me, (on the top of the picture)
From the looks of it the red wire on the bottom has been broken off next to it.

Before you proceed you'd have to know what wires are connected to what and how exactly the cells are wired. I hope you have a multimeter and know how to use it, right?

The other thing is, I wouldn't mess with a li-ion battery without knowing exactly what I'm doing. There are several things that can go dangerously wrong with them (They can pop release toxic gasses/explode/catch fire if handled incorrectly) And depending on how they are wired it's fairly easy to do something wrong.

I think you should look for a fellow e-bike enthusiast who also runs a shop in your area or try to meet up with somebody if that battery is so important.
Polly Faffingwater - Fri, 19 Jun 2015 04:31:20 EST ID:NiQxsM8d No.6721 Ignore Report Quick Reply
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Judging by the blob of solder on the loose red wire, I'd say it belongs up next to the red wire with the spring, where there is a terminal with a blob of broken solder.

I'm also guessing that is the fuse, so that would tell me that the terminal with the blob of broken solder is not supposed to be touching the red wire with the spring and needs to be bent away so that it does not touch.

Ideally that wire would be soldered in place but if that's not practical you might or might not get away with using a little bit of wire and some tape to tie it into place, remember you could cause a fire inside the battery and subsequent explosion if this connection is not secure and tight. Tight is right.

If that actually is the fuse up there I'd also check its not blown, if it is blown, try replacing it but resist the temptation to bypass it by touching the two red wires back together as it might be a sign the battery is actually fucked.

Also remember that I'm just a guy on the internet and if you try this repair yourself and my advice is wrong you could end up blowing up the battery, but no worries really since its already fucked anyway.. as long as your house doesn't burn down or something because of it.

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