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Linear displacement by John - Tue, 01 Oct 2013 06:52:34 EST ID:fy15wSYi No.5929 Ignore Report Reply Quick Reply
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I'm doing a little project of mine and I have encountered a problem..

The project is basically a motion platform that moves in three directions at very low forces (few mN). I got the first two direction done (X,Y), but the third is giving me trouble due to the gravitational force.

Basically I use some very thin beams (flexures) that allow deflection in one direction and none in all others. In X and Y I have no issues with gravity, but in the Z direction the beams own weight and as the force is not applied directly at the centre of the flexures, my whole thing starts to rotate which I don't want.

So I was thinking of maybe using a linear spring that doesn't allow bending.. Do such springs exist at such a stiffness (20 N/m)?
Frederick Wanningdudge - Sun, 06 Oct 2013 16:12:31 EST ID:D8N1xh14 No.5944 Ignore Report Quick Reply
A spring that does't bend? House a spring in a piston or something. Is that what you're asking for?

Microwave by Jarvis Haffingkock - Tue, 10 Sep 2013 17:51:34 EST ID:0fHJPk0Q No.5892 Ignore Report Reply Quick Reply
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Is it reasonable to be freightened by my old microwave? The latch sucks and sometimes the microwave just gives up from latch issues. I also feel a stream of warm air in specific areas.
7 posts omitted. Click Reply to view.
Phoebe Tootson - Thu, 26 Sep 2013 00:32:08 EST ID:vwBSL6/Z No.5908 Ignore Report Quick Reply

You're worried about that and you're eating the food out of it? lol...

Microwaves are deadly, stay away from them.
Graham Crecklesidge - Fri, 27 Sep 2013 08:34:04 EST ID:A8jxg2uv No.5911 Ignore Report Quick Reply
For fuck's sake, OP, just get a new one cheap from factory seconds or something.
Nicholas Boblingkad - Fri, 27 Sep 2013 09:46:53 EST ID:ZpOwOy+z No.5912 Ignore Report Quick Reply

you could say he didn't see it coming
Samuel Niggerway - Fri, 27 Sep 2013 14:15:45 EST ID:WqMK7Yu4 No.5913 Ignore Report Quick Reply
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Fucking Blanderforth - Mon, 30 Sep 2013 14:20:02 EST ID:wZ4RqE3j No.5926 Ignore Report Quick Reply
I got an old microwave for free and it didn't heat food at all and gave me and my brother a headache within 2 or 3 minutes. I'd be more worried about the magnetron being bad than it not latching properly.

medical grade silicone by Dopey Wang - Fri, 27 Sep 2013 20:40:10 EST ID:IeKJOxZ+ No.5915 Ignore Report Reply Quick Reply
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not sure if this is the right section but anyone know where i can buy medical grade silicone for making adult toys?
Shitting Bunson - Fri, 27 Sep 2013 21:39:20 EST ID:23z3O8Uj No.5916 Ignore Report Quick Reply
Dopey Wang - Sat, 28 Sep 2013 16:31:02 EST ID:IeKJOxZ+ No.5919 Ignore Report Quick Reply
>>5916 I dont need it for the mold, i need it for the finished product so it has to be body safe. I've already ran quite a few google searched and emailed a few site (but obviously they wont give out that info)

2 stroke chainsaw by Shitting Pablinglere - Tue, 10 Sep 2013 09:45:03 EST ID:SOVM0ZNF No.5891 Ignore Report Reply Quick Reply
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Hey guys

I'm currently in first year and for a chemistry based unit we have to figure out what
material 9 components are made from. Most metalic, some polymer.

Anyway i'm not entirely sure when it comes to moter mechanics, and was wondering what some of the components will experience, in-terms of stress, heat subjection, and basically any condition that would applied during use.

Things like the cylinder head, the crank sump case, the crankshaft, the piston and the muffler.

The polymer components, i'm assuming, won't come under much change in temperature but conditions more like stress.

TL;DR - What parts of a 2 stroke engine for a chainsaw would experience high temperature? What defines the properties of the materials used?
Whitey Pullykire - Fri, 27 Sep 2013 14:19:20 EST ID:7p59x5Kr No.5914 Ignore Report Quick Reply
What parts of a 2 stroke engine would experience high temperature?

Spark plug, cylinder head, cylinder walls, piston head, exhaust port, exhaust pipe,reed valve, head gasket exhaust pipe gasket.

>components will experience, in-terms of stress,
shit will get red hot and experience extreme vibration of varied frequency including acoustic vibration and ultrasonic vibration. frictional stress, strain(elastic stress) and compaction. The part we're talking about depends on what stress it receives.
Thomas Cindershaw - Fri, 27 Sep 2013 22:12:42 EST ID:1/RGVUTh No.5917 Ignore Report Quick Reply

You forgot the chain + blades. those get hella hot, so i'd imagine would the teeth on the stationary blade

Revit resources by Edwin Gopperlock - Fri, 20 Sep 2013 16:14:26 EST ID:0fHJPk0Q No.5904 Ignore Report Reply Quick Reply
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I took a revit class a bit ago but I don't feel so fresh, having gotten used to several software since then.

Is there a great guide I can touch up on? I've already checked the first few pages of varied youtube searches, under the "long" category.

Fire and shit by George Drenderway - Fri, 13 Sep 2013 19:10:54 EST ID:XiGeXXo1 No.5898 Ignore Report Reply Quick Reply
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I wasn't sure where to post this, but I figured you guys would be most suitable. I'm a pro wrestler and to make my appearance more interesting I'd like to wear a flamming jacket during my entrance. Something like pic related.

I'm no engineer (philosophy student pls), which is why I seek your advice to build such a thing. What I would need would be some sort of trigger that activates the fire on the back, be it on the wrists or even on the chest, and the fire would need to extinguish after ten seconds or so. Again, forgive my ignorance, but I imagine the jacket would need to be constructed in 3 layers, the first a protective material to prevent burning and pain, the second an absorbent material which could be dosed with a highly flammable liquid and the third would be a metal that wouldn't conduct heat yet would allow the fire to seep through, maybe in the form of chain-mail. It may be safer to just have the arms light on fire. I was thinking maybe just altering the arms on a greatcoat but with the same premise as above.

Any advice would be a great help.
Ian Desslehire - Sat, 14 Sep 2013 11:45:06 EST ID:VLmiDLgV No.5900 Ignore Report Quick Reply
Maybe protect your head with a hoodie and some flame-retardant gel, like stuntmen use.
Wesley Clockleworth - Sun, 15 Sep 2013 03:50:30 EST ID:v8qu+fWE No.5901 Ignore Report Quick Reply
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And use a "stage flame", a low-temperature alcohol flame that's less likely to make you into a crispy critter.

And you should use some version of this as your entrance song.

/tesla/, meet my friend /dis/ by Nigel Beblingford - Thu, 12 Sep 2013 02:08:09 EST ID:tB60PQ7m No.5897 Ignore Report Reply Quick Reply
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ITT: general manufacturing.

So, I was watching some youtube vids on what to do with my new MOT when I hear that high voltage ionizes 'oxygen and nitrogen into ozone and nitric oxide gases'. Chemistry is not my strong suit, so I started thinking that I found an easy way to create N2O. A few internets later, I found that this wasn't the case... but I did find something else.

>Ozone does not react with ammonium salts, but it oxidizes ammonia to ammonium nitrate:
> 2 NH3 + 4 O 3 → NH4NO3 + 4 O2 + H2O

>Nitrous oxide is most commonly prepared by careful heating of ammonium nitrate, which decomposes into nitrous oxide and water vapour.
> NH4NO3 (s) → 2 H2O (g) + N2O (g)

Therefore, Windex -> voltage -> laughing gas. Q.E.D.

/tesla/ chemists: is this a real thing? Moreso, is this ChemE territory safe enough for an EE?
Thomas Claystock - Mon, 23 Sep 2013 17:02:28 EST ID:9FHP6N92 No.5906 Ignore Report Quick Reply
1) windex isn't ammonia, or at best is 5% ammonia
2) you would have to create the ozone, then pipe it through the ammonia
3) then you have to purify and carefully heat the ammonium nitrate

All in all, a lot safer, cheaper, and better to just buy your own N2O

Engineer board by Lillian Beblingdudging - Thu, 05 Sep 2013 06:32:19 EST ID:qcML6joZ No.5880 Ignore Report Reply Quick Reply
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You have done well, my children.
We created you, that one day, there would be a board for Engineers.

Wait, why is that cat pushing a watermelon out of a lake?
M - Thu, 05 Sep 2013 08:13:51 EST ID:X6IJO66p No.5881 Ignore Report Quick Reply
this is not /b/
Eugene Fammlespear - Fri, 06 Sep 2013 10:13:22 EST ID:+FYkgdda No.5883 Ignore Report Quick Reply
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You make me sad, my children.

But never mind. Now, who wants a refreshing ice cold glass of black oil flavoured space jockey cola?
David Hupperwell - Fri, 06 Sep 2013 11:48:05 EST ID:WqMK7Yu4 No.5884 Ignore Report Quick Reply
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Hamilton Seddlemudge - Sat, 07 Sep 2013 13:40:31 EST ID:iYjHoSI2 No.5885 Ignore Report Quick Reply

How does Geophysics compare in difficulty to EE? by Schist n giggles - Sat, 24 Aug 2013 13:30:43 EST ID:2DP31g8E No.5849 Ignore Report Reply Quick Reply
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I have heard from multiple sources that it is superior difficulty, not that this is the only goal in life. It's just nice to know how much smarter I am.
Frederick Worthingwell - Sun, 25 Aug 2013 11:33:41 EST ID:GZzfqPep No.5850 Ignore Report Quick Reply
so effing win
Oliver Wickleson - Sat, 31 Aug 2013 13:54:46 EST ID:AW4qvvm4 No.5862 Ignore Report Quick Reply
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I have heard it contains all the math, more physics, and more fun as it relates back to the earth. Not certain about the jobs market, but you are trained as a scientist, debatable if there are engineering-like qualities
Painsley Whetherwurth - Mon, 02 Sep 2013 13:59:40 EST ID:AW4qvvm4 No.5871 Ignore Report Quick Reply
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This may not be the place for lively / conscious discussion, might try /sci/

MSU or U of M by Rebecca Nobberbadge - Fri, 16 Aug 2013 11:43:19 EST ID:QaUuZN7s No.5839 Ignore Report Reply Quick Reply
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Which university is better for engineering Michigan State or University of Michigan? I have heard that UM is better in most aspects but I also heard tha MS has a very good engineering program.
Albert Winnerbury - Sat, 17 Aug 2013 16:21:17 EST ID:j23CgD3m No.5841 Ignore Report Quick Reply
dafuq i aint lookin this shit up for you.

Ernest Hunnerstone - Fri, 30 Aug 2013 20:44:32 EST ID:+rn9B2zr No.5861 Ignore Report Quick Reply
U of M, no contest.

Post Navy success by Clara Bungerstudging - Tue, 11 Dec 2012 22:35:56 EST ID:D58N+P13 No.5205 Ignore Report Reply Quick Reply
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rom browsing around I've noticed a good portion of 420chan, and specifically /tesla/, has a good portion of ex-Navy nukes. What route in education did you take after getting out? Any tips for a enlisted guy before he finishes his contract? Any quals? I'm applying to Berkeley's engineering school for mech engineering/mat science next year and would like to whittle down my options.
5 posts and 1 images omitted. Click Reply to view.
Cyril Gongerchore - Mon, 26 Aug 2013 16:06:05 EST ID:z/T7oF28 No.5854 Ignore Report Quick Reply

No, drug testing is frequent and necessary.
Rebecca Chindleham - Mon, 26 Aug 2013 17:10:30 EST ID:8dHMlv2D No.5855 Ignore Report Quick Reply
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well then, I'm just going to sit on the sidelines and have a toke as we spiral into world war three. too bad, because since I finished college I've been getting really tempting offers from recruiters.
Hamilton Fellershit - Wed, 28 Aug 2013 11:29:52 EST ID:iT11fP9F No.5857 Ignore Report Quick Reply
Get it? NAVY
Clara Fanway - Thu, 29 Aug 2013 02:58:25 EST ID:23z3O8Uj No.5858 Ignore Report Quick Reply
No the US is a shit hole.

However if you move to Canada...

they don't drug test you
Hamilton Niggerforth - Sun, 01 Sep 2013 12:38:08 EST ID:TubU1ztk No.5866 Ignore Report Quick Reply
yeah but no aircraft carriers or subs :C

CU Boulder engineers by Charles Grimwater - Sat, 17 Aug 2013 12:32:48 EST ID:M/lGRcbh No.5840 Ignore Report Reply Quick Reply
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Gonna be an upcoming freshman at boulder and I'm moving in on the 20th. Anyone go CU that does engineering tell what its like? Its a toss up between aerospace engineering or chemical and biological engineering.
Thomas Popperworth - Wed, 21 Aug 2013 01:14:10 EST ID:e5COnnh+ No.5845 Ignore Report Quick Reply
Engineering is a very hard major. You better be ready to be going to study groups and asking out of class for help. Especially aerospace, chemical and petroleme engineering
Jarvis Fablingstone - Fri, 23 Aug 2013 14:05:36 EST ID:51DjIEIu No.5847 Ignore Report Quick Reply

Don't listen to this guy. Not everyone benefits from study groups. If you're one of the smartest people in the group, you'll probably do better studying on your own as the group will slow you down. Oh, and some study groups are only LOLOLOL LET'S BITCH ABOUT HAVING TO STUDY FOR 3 HOURS! We have cell phones now so group studies are kind of obsolete when you can text/call your homie and ask him/her a question on the fly. If they haven't gotten there yet, they'll let you know what's up when they get there.

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