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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.

IBEW Aptitude exam by Nigel Blackham - Mon, 02 Feb 2015 02:22:22 EST ID:13NkwJyT No.6630 Ignore Report Reply Quick Reply
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I'm not sure If I might be better off posting this on /howto/ but I feel like I might have a better chance of finding an electrician here.

I'm interested in applying for an electrician's apprenticeship through my local IBEW/NJATC training center (VA, U.S.) the only problem is I'm having a little trouble finding out exactly what I'm supposed to know for the entrance exam. All of the sources I've examined seem to agree that reading comprehension based on passages and numerical pattern recognition will be present, but other than that several of the sources I've found disagree. Some of them say that the test involves math up to trig (sin, cos, tan, etc.) but this is in the minority. Most seem to suggest it's just basic algebra, i.e. functions and general math.
I found one alleged study guide that said it would specifically focus on math involving fractions and decimals, and then have a section based on "paper folding" (visualizing folded paper in one's mind and figuring out a pattern).

I'm hoping someone here might have gone through this recently, or at least recently enough that they can give me a first hand account of the subject I should expect. With the exception of the trig I've got a pretty good grasp on the other potential topics, I just want to make sure I'm studying the right materials and that I don't waste time studying things that won't end up being on the test.

Thanks for any help.
Fuck Peffinggold - Mon, 02 Feb 2015 21:34:58 EST ID:a5xmRWEe No.6632 Ignore Report Quick Reply
you should call the organization, these places are usually pretty people friendly in my experience.

Volafile by David Findlewill - Sat, 31 Jan 2015 00:43:55 EST ID:YxxDX9gl No.6628 Ignore Report Reply Quick Reply
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I just found out that the 420 room on Volafile is still a thing, and I thought of /tesla/, since you have a hunger for textbooks, it'd be a good way to share/request.

Files posted last two days, before auto-erasing.

Helmet Crushing by Frederick Clenkinnat - Mon, 11 Nov 2013 19:14:43 EST ID:oMr173xc No.5993 Ignore Report Reply Quick Reply
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What's up /Tesla/, I asked this question over in /math/ and they sent me over here.

So I play a role playing game called Warhammer 40k, in this game I play a character who has a Magneto like power in that he can exert force on metal objects.

I'm trying to determine whether or not the force I exert will be enough to crush a human skull with the helmet they are wearing. The power that I'am using allows me to lift 2kg of metal for each point of my willpower(41), I assume this gives me two times the force of gravity, which would give me a total force of about 803N or ~180ft/lbs.

I'm not sure where to go from here, for the shape of the helmet I'm not sure if I can assume its a hollow sphere or if I have to find more exacting measurements to get n accurate answer. As for acceleration I'm just going to say its going as fast as a baseball so ~250m/s/s

What else do I need to know, and what if anything is wrong with my assumptions to determine if I can Magneto crush some poor Imperium soldiers head?
4 posts omitted. Click Reply to view.
Hedda Crullyridge - Fri, 20 Dec 2013 07:02:46 EST ID:ARMPr7t7 No.6040 Ignore Report Quick Reply
Maybe you'd be best off pulling the pins from all their grenades at once.
That would at least make their day interesting.
John Blatherford - Fri, 20 Dec 2013 09:17:28 EST ID:ABtclRoI No.6041 Ignore Report Quick Reply
Wouldn't the tensile strength of the material of the helmet come into play? Ceramite is not joke in 40k. Flak on the other hand...
Jack Seffingsotch - Sat, 28 Dec 2013 18:42:34 EST ID:+8AyT+E2 No.6051 Ignore Report Quick Reply
Too many variables, OP.
Augustus Blackwell - Tue, 20 Jan 2015 02:43:04 EST ID:vaz+up9C No.6623 Ignore Report Quick Reply
They were space marines that had genetically modified bodies from the original geneseed making them superhuman and superhumanly tough bones
They could carry a 2 tons on their body Im sure their skull could take it

plus in books they have these rodlike projections/piercings that they put in your head to help withstand that force, or help from psykers or control that psyker shit
Sophie Wocklestock - Fri, 23 Jan 2015 19:56:16 EST ID:DGhbsE6f No.6626 Ignore Report Quick Reply
82kg of pressure isnt much
It wont crush a helmet or a adult head

Cuban DIY by Edwin Duckfuck - Sat, 10 Jan 2015 05:12:22 EST ID:Mhev0LT0 No.6612 Ignore Report Reply Quick Reply
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Will you ever be as inventive as a Cuban with a problem and a pile of garbage?
Graham Murdshit - Mon, 19 Jan 2015 21:48:57 EST ID:VrPIhCGo No.6622 Ignore Report Quick Reply
Possibly not but the ideas derived from the culture are good to keep in mind :)

Which degree should i get? by wordmachine - Tue, 06 Jan 2015 02:09:09 EST ID:LNylbZ3V No.6605 Ignore Report Reply Quick Reply
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Hello fellas, I graduated High School about 8 months ago and I've kind of drifted from low level job to low level job for a bit but now I think I'm ready to go to college. I'm fairly certain I want an engineering or computer science degree of some sort but I'm not sure which to get. Ideally I would want to become a software engineer and work somewhere in Austin possibly at a start up or game studio. Any advice on what path I should be taking?

sorry if this is the wrong board.
M - Tue, 06 Jan 2015 02:55:55 EST ID:06ISvFUq No.6606 Ignore Report Quick Reply
If you want to become a software engineer this is probaly the wrong thread yes. Maybe you should try /tech/ or /prog/
Good Luck!
M - Tue, 06 Jan 2015 02:56:41 EST ID:06ISvFUq No.6607 Ignore Report Quick Reply
Board, not thread
Frederick Pittingsit - Mon, 12 Jan 2015 20:10:03 EST ID:LHXB/Tyz No.6618 Ignore Report Quick Reply
A lot of universities now offer a major called Exploratory Engineering for those who are not quite sure what discipline they are interested in. You'll mostly be taking pre-reqs early on anyways. Good luck and god speed.

Average & Effective Value by Electro M. Echanics - Mon, 12 Jan 2015 07:39:56 EST ID:Dkbr06ET No.6615 Ignore Report Reply Quick Reply
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Someone here who could help me out find the average and effective value (True RMS) of this function?
I would be Very Thankful!
Electro M. Echanics - Mon, 12 Jan 2015 07:42:28 EST ID:Dkbr06ET No.6616 Ignore Report Quick Reply
This might help: http://meettechniek.info/compendium/average-effective.html
Fanny Crimmerwater - Mon, 12 Jan 2015 11:36:28 EST ID:06ISvFUq No.6617 Ignore Report Quick Reply
Dit is geen huiswerk website, probeer google of je studieboek. Mocht je geen student zijn, begin dan nooit van je leven aan meettechniek tenzij je geil word van fourrier vergelijkingen enzo

Help me make a synth / sequencer / drum machine: by Pez - Mon, 29 Dec 2014 13:22:00 EST ID:k7ObdMFa No.6601 Ignore Report Reply Quick Reply
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I'm starting my dissertation - I want to build some kind of electronic music device. Either a synth/sequencer or a drum machine. I've made a MIDI controlled drum sequencer in PureData before, but I'm now looking into making my own controller as well as programming the software which will generate the audio. I'm pretty sure I've settled on using an Arduino Mega as it's got plenty of ins/outs so that's good for functionality (unless anyone could recommend anything better?), and I was thinking of generating and processing the audio in ChucK. What do you guys think of this idea? Any advice would be appreciated.

Also, can anyone recommend any good sources (books, websites, youtube channels) for both analogue and digital audio electronics, or any other relevant sources for this topic? Similar projects etc.

Cheers in advance.
Pez - Mon, 29 Dec 2014 13:31:55 EST ID:k7ObdMFa No.6602 Ignore Report Quick Reply
...Also, what do you think about generating the audio in Chuck, then partially digitally processing the audio (again in Chuck) and then outputting that to some analogue components (filters etc), just to maybe get some of that analogue sound and score some bonus points ;)
Fucking Wupperforth - Sun, 11 Jan 2015 01:04:38 EST ID:rklLDMts No.6614 Ignore Report Quick Reply
Not a recommendation or anything, but I think a waveform-biased synthesizer would be impressive. Something where you would physical tune the core frequency, having a bunch of volume adjusters for harmonics, have some sort of sculpting tools to alter the waveform, etc. If you had a screen panel on the side you could explicitly give an image of the wave-form, and have buttons to switch to the different harmonics (perhaps with their own waveforming) and super-impose the final sample. In software, you could have something where even if you tried to do some effect that was calculated over multiple waves, it could demonstrate how that no matter what, a fourier transform works.

Outward opening door lock by Samuel Gozzledeg - Fri, 04 Jul 2014 03:48:01 EST ID:wwXtgtI1 No.6387 Ignore Report Reply Quick Reply
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So I just moved into a new apartment and the backdoor is a outward opening door facing the street, it has 3 dead bolts but it is obvious someone has crow barred it open before not sure if it was police/fire dept or someone broke in, anyway I want to get some sturdy locks on the thing but I am having trouble finding any for outward opening doors

I tried something like this http://www.amazon.com/Mintcraft-Ss-b04-db-Barrel-Stainless-Steel/dp/B001GLZQFG/ref=sr_1_2?ie=UTF8&qid=1404456927&sr=8-2&keywords=bolt+lock

but it won't fit on the door properly since the interior has a 4-5 inch molding I could drill into it but it would still be almost at the edge if connected to the door which would still be pretty easy to prey open since there would be less then a quarter inch of wood holding onto the bolt.

I was thinking the old fashioned chain door lock but with an outward opening door it seems like that would be easy to just cut.

tl;dr i need a outward opening door lock
Samuel Grandhall - Fri, 18 Jul 2014 18:51:40 EST ID:ctw8nGDk No.6404 Ignore Report Quick Reply
Picture of the situation?
Ernest Hazzleford - Tue, 06 Jan 2015 22:50:46 EST ID:VYKZkXpH No.6608 Ignore Report Quick Reply

Get a doorjammer. Way better than a deadbolt.
Rebecca Hollerville - Fri, 09 Jan 2015 00:23:35 EST ID:a5xmRWEe No.6609 Ignore Report Quick Reply
put the hinges on the other side

i see no problems with this by Basil Crummleman - Fri, 05 Dec 2014 09:57:11 EST ID:xjkvZpNQ No.6585 Ignore Report Reply Quick Reply
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hey guys i got an idea. i plan on rigging up my roll around tool cart at work with car batteries to power my corded tools and such without having to have an outlet nearby. im pretty sure all i need is a power inverter to turn the dc batteries into ac power and a battery charger to charge my batteries when not in use (i.e. when im not there i leave my tool cart at work obviously) does anyone see any issues with this?
Angus Greenman - Mon, 08 Dec 2014 18:33:27 EST ID:w4ndsl7g No.6586 Ignore Report Quick Reply
Exposed battery contacts would likely violate OSHA standards
Lillian Pickworth - Mon, 08 Dec 2014 19:51:13 EST ID:5z+lhQRM No.6587 Ignore Report Quick Reply
Use deep cycle marine batteries and a powerful enough inverter.
Whitey Messlechut - Mon, 08 Dec 2014 21:41:28 EST ID:01krkNKo No.6588 Ignore Report Quick Reply
Make sure it's rated for heavy inductive loads. Power tools pull a lot of current and it's pretty much all inductive load, which would fry a lot of the cheaper stuff that's out there. It must be pure sine wave, none of this MSW crap. Modified sine wave is noisy as fuck and will damage your motors, battery chargers, and lots of other things.
Hannah Boshville - Sat, 27 Dec 2014 18:37:05 EST ID:a5xmRWEe No.6600 Ignore Report Quick Reply
your tools might not like an inverter
can't you switch to battery or air powered?

mcguyver thread by Henry Trotham - Tue, 09 Sep 2014 14:44:42 EST ID:uTTzr48/ No.6476 Ignore Report Reply Quick Reply
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I have the following tell me what you would build
duck tape
empty water bottles
empty beer cans
empty wine bottles
3 broken office chairs
6 feet of PVC pipe
a broken printer
1 posts omitted. Click Reply to view.
Ebenezer Blingerfoot - Sun, 21 Sep 2014 10:05:22 EST ID:PlsgwkW/ No.6495 Ignore Report Quick Reply
I would build a trash can to hold all the empty bottles and broken shit
Nell Semblebury - Sun, 21 Sep 2014 21:20:02 EST ID:DTtvLj5M No.6496 Ignore Report Quick Reply
Tape together the water bottles, forming a raft. DO the same with the wine bottles and and vodka bottle (after drinking it). Polish the end of the beercan with vodka and socks, and use that as a lens to start a fire with the paper and cardboard. Smash apart the printer, to get plastic panels. Use the panels and heat from fire to seal the ends of the PVC pipe. Reinforce panels with duck tape. Use two of the chair to construct oars (use seat/back and support rods). Use last office chair as captain's seat. Use books as ballast. use ripped up underwear and socks for any more lashings you don't trust the duck tape to handle.

Row off into the sunset.
Isabella Fiblingbanks - Thu, 06 Nov 2014 20:00:01 EST ID:DKM7qcdl No.6567 Ignore Report Quick Reply
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Alice Gellysot - Fri, 14 Nov 2014 13:01:46 EST ID:ynSy5DbE No.6569 Ignore Report Quick Reply
Ha. Turn the PVC into a manual watering hydro system using the waterbottles as ghetto net pots. Use the office chair wheels to add wheels to it so its movable for whatever reason. Take the beer cans and return them for the deposit. Put the paper/cardboard/books into a firepit. Start the fire THEN drink the vodka wearing nothing but socks and underwear and dance around said fire. Reenact the scene from office space by smashing the printer to some Ghetto boys. Buy a box of wine and fill up the empty wine bottles with the box and feel more fancy when you drink. Save the duck tape because its the most useful thing you listed.
Komarov - Wed, 10 Dec 2014 02:22:10 EST ID:Bi0SolbP No.6590 Ignore Report Quick Reply
I fucking lol'd

steel cables don't like to be folded by Hedda Nickleville - Sat, 29 Nov 2014 11:43:22 EST ID:E7UJnAxL No.6580 Ignore Report Reply Quick Reply
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I'm making 8 bucket lights, similar to the pic. The buckets will be hanging from 2mm uncoated steel cable. My problem is with connecting the cable to the bucket. Currently, I'm drilling holes into the bucket, putting the cable through, then I fold the ends over using a combination of a pipe wrench, hammer and fingers, and put a lump of solder on it. It works but my fingers are bleeding after just 2 buckets. I could've crimped ferrules onto the ends but that shit's expensive. This is where you guys come in. Got any good ideas?
Nicholas Dappershaw - Sat, 29 Nov 2014 12:16:43 EST ID:dlCxw3eb No.6581 Ignore Report Quick Reply
Cable shoes are not expensive
Charles Tootson - Sat, 29 Nov 2014 16:40:41 EST ID:01krkNKo No.6582 Ignore Report Quick Reply
These terminal strips are pretty cheap. Buy 1 or 2 and cut them into individual pieces. Thread the steel wire in and tighten the screw. Done.
Charles Tootson - Sat, 29 Nov 2014 16:41:12 EST ID:01krkNKo No.6583 Ignore Report Quick Reply
whoops, meant to reply to op
Matilda Naffingsadging - Mon, 29 Dec 2014 23:10:40 EST ID:2/KQDBgb No.6603 Ignore Report Quick Reply
Glue a bead onto the cable.

"hoverboard" for 10 000 $ by Tit Picking - Fri, 28 Nov 2014 05:10:46 EST ID:fyG0onAI No.6579 Ignore Report Reply Quick Reply
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I think you all have seen this one video with the hoverboard.
The one with Tony Hawk and blue ligths.

AM I the only one who thinks these guys are pretty delusional?
And I am not even talking about their stupid PR-babbling
(""great way of capturing peoples interests"
"this can make a serious difference in solving difference problems"


but the specifications of this thing!

  • it can only drive on copper and aluminium-laced areas.
  • it weights 40 pounds
  • lasts only for 1,3 minutes (!)
Comment too long. Click here to view the full text.
Fanny Niggerhood - Tue, 02 Dec 2014 19:04:35 EST ID:ynSy5DbE No.6584 Ignore Report Quick Reply
Volcano surfing.
That is all

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