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File: USB-3.0.jpg (44 KB, 500x371) Image search: [iqdb] [SauceNao] [Google]
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according to official specs, not more than 500mA should go over the wires, but many devices seem to ignore that; and on my PC, that causes the mainboard to protect itself by simply switching off the powersupply.

are there any schematics about how to build a limiter for usb? eg, get an usb extention cord, cut it and solder in a few parts?

from what I know, I cannot just reduce usb to the data wires only since it needs the +5v/gnd for handshaking or such.
28 replies and 4 images submitted. Click here to view.
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you could just add a series resistor to limit the current, but you'd get a voltage drop as well.
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Not sure about limiting current, but you could get a powered usb hub. Then your pc will not see any of the load
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>>984117
i think you're asking the wrong question
limiting the power will prevent your usb devices from working
go get a powered usb hub.

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Hi /diy/nosaurs.
I've joined some engineering/diy competition at my work, I'm curious as how would you guys proceed/what are your ideas.

The idea is to allow remote (280m end-to-end of the train) control of 4 pushbuttons, control of a lever (center of the red box) and monitoring of two control lights.
So far I've got communication (LoRa on arduino inside the locomotive, LoRa usb-key on android with the operator), pushbuttons, LEDs monitoring and power figured out.
My team have some ideas about controlling the lever, which may require up to ~40N...
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>>984067
Additional thoughts :
We gotta be non-invasive, so we're gonna go with suction cups & magnets on a panel that holds everything mechanical. We aren't guaranteed the surfaces we're latching on will be metal so...
Also it's not a commercial product or anything, not gonna be mass-produced outside of the contest. It's some internal PR stunt to show that we can create stuffs using 3D printing and "new technologies", nonetheless quite fun to join.
>>
What does it control? By that I mean it's obviously a mechanical lever, so hydraulic or pneumatic?

Perhaps you could disconnect hoses at lever and add a spool/coil valve block. Than as long as you can energise coil you would have control over flow. Or have I misunderstood you completley?
>>
Also, is it proportional? Or do the operators use it either on/off

I get the impression you want to rig something up to physically turn the lever, I think the better way would be to bypass it all together

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Alright so here is my idea. I want to start a podcast called the Antichrist monologues, where it's the Antichrist talking about his life and experiences. My problem is my headset microphone doesn't work all of a sudden, and I would know how to make a pop filter for my smartphone. So any ideas?
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Thanks for the idea. Going to steal your idea
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>>984058
Jesus here, I made it happen, don't try to talk to my people again
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>>984058
I am so dubious that your attempt at producing an (edgy) podcast about the antichrist won't suck miserably, especially considering that the production budget is limited to a headset mic. Anyways, if you can find a block of foam and rubberband it to your phone that should help get you the sound you want. That, or you could make a ring out of a coat hanger and wrap a pantyhose. And please try not to fall into predictable cliches about being misunderstood and at the fringe of society etc.

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/diy/, is spending 100 on a hakko iron thatll probably last a while more worth than buying a cheap station like the Aoyue 469? I plan on building the mcHF as the first project with the iron, so being able to do smd soldering well is necessary.
25 replies and 5 images submitted. Click here to view.
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Hakko FX888-D is a damn good iron for the price. If you're doing lots of SMD or lots of small and precise stuff, it's a very worthy investment.
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>>984035
do they last forever if taken care of? im currently a college student, and if it would last me for a lifetime i think ill just spend the extra money
>>
The Hakko is great, but if you've got a few extra bucks to spend and plan on doing lots of SMD, maybe have a look at Aoyue 968, you get hot air with that one.

How to make your own keyboard?
9 replies and 2 images submitted. Click here to view.
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haven't done any myself but check out geekhack, a keyboard enthusiast forum. Specifically check the Projects section. Lots of really cool shit. Can't post link, 4chan thinks it's spam.
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>>984012
If you want a good keyboard you need a PCB base, but one large enough for a tenkeyless will cost you about $800USD as a one off. So that rules easy assembly out, what you could potentially do is CNC cut some acrylic to hold the switches, another as your front and rear covers, then just point to point wire the keys to any uC or keyboard IC you can source for cheap.

if you are wanting a good fit and finish you're not going to be able to diy this, the scale and materials available don't lend themselves...
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>>984093
see pic related, used as a test jig for key life.

File: asbestos.jpg (25 KB, 448x440) Image search: [iqdb] [SauceNao] [Google]
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How do you create asbestos materials? I have some raw asbestos my friend got
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You don't. It's illegal. Posting this for those who don't realise its bait and think asbestos is safe and sound.

There is a notable exception in the USA for it's use and yours isn't it.
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>>984007
>living in a police state
>2016
>>
>>984007
Regardless of legality, I'd be concerned about getting asbestosis :/

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I tried to ask this on /toy/ but they're too busy masturbating and talking about action figures.

So, I want to design and build toys, make some solidworks designs I can 3D print or something.

It's mostly cheap plastic crap with maybe some magnets.

Any engineer here who can give me some tips?

Also, anyone here with experience on how to patent stuff?

Does a 3D model of a new action figure falls under the design patent and not the utility one?

I have some questions.
8 replies and 2 images submitted. Click here to view.
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>>983939
You might find some of your answers here, we have a few engineers.
If your into 3d design there is a 3d board or two that might have some tutorial threads or useful sticky.
I think one of them is /3/
>>
OP, 3D printing is too much of a hassle to be viable when making a series of toys. It's great for making a prototype. But after that you might want to invest in some injection molding, or if you just want to homebrew resin casting.
Really depends on what you want to do and i can't offer any real advice without more information.

I've made some /tg/ grade stuff miniatures and really small batches of figurines ~150 each when I worked for a games shop.

I don't think you can patent a toy, unless it's a new method for manufacture, but you...
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>>983956
thanks.

was planning on mixing a basic wheel magnetic motor with some gyroscope and a Phenakistoscope

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Hey /diy/,

Pencil sharpening knife recs? Thinking of moving to the Bay Area and becoming a multi-millionaire.
7 replies and 2 images submitted. Click here to view.
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>>983860
for the curious:
https://aeon.co/videos/a-deadpan-treatise-on-the-craft-of-pencil-sharpening-from-a-master-artisan
>>
this is utterly retarded, so is the fag in the video
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>>983860
this has ti be a joke.. this dude is not trolling then he is the kingfaggot of all fags

File: milldrill.jpg (32 KB, 500x375) Image search: [iqdb] [SauceNao] [Google]
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Is there anyone on here that has done this conversion? I know the main things to swap/modify are the spindle bearings due to them not being able to withstand lateral force very well. Also swap out the chuck for no run out when end milling. Anything else that you would consider important? Pictures would be sweet. I found a pretty comprehensive write up but I'm more of a visual person.

Pic not mine
12 replies and 1 images submitted. Click here to view.
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>>983846
Just get an X-Y vise and take light cuts. If you're going to fuck with it extensively you might as well just get a proper mill.
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>>983846
that looks like an awful idea. the motor mounted to the column will rotate when subjected to side milling loads.

I just bought an angle plate and single axis table and mounted it to the cross slide.
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>>983846
if you already have a metal lathe. why not just build your own mill??? the lathe is the god of all tools. its the only tool that can pretty much rebuild itself...

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Anybody have any info on how or where to begin for making dolls like this? Any guides, specific studies, anything? Please.
10 replies and 1 images submitted. Click here to view.
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>>983748

You have severe autism and should seek professional help immediately m8
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>>983748
There was a guy on /mlp/ a couple of years ago who was making a life size Sunset Shimmer plushie but i don't know if he ever finished it.
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>>983828
I'm recieving professional help from a very good psychiatrist, thanks.

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Lads, can u use a hammer to move the sliding bush on an alternator? I'm replacing one but don't have a drill press
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>>983657
Have to make the one on the right match the one on the left (bush is on the bottom arm)
>>
>>983657
>>983658
yes, see the slot running down the inside of it? that means it's only held in loosely with friction. super easy job.

put it in a vice so the outer molding is evenly supported, if you don't have a vice you can rest it on a socket that's large enough to catch the bushing, then just use a bar or another socket to drive it out.
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>>983657
>>983658
looks like there is some room in that bush to be compressed, maybe with a vice?
hammering it should also work but you would need a really stable base to work with, perhaps an anvil (or anvil like device, heavy stable and with a small hole in it)?
gl

I'd like to make one of those slab cutting boards people make from 1 inch cubed cubes. Unfortunately, I don't have the money to go buy some nice pieces of wood to do it.

I do however have a wood pile of white oak, dried for about a year, maybe year and a half. I've also got a truck bed full of hard maple someone gave me yesterday, after trimming several limbs and a whole tree.

I can probably cut and find enough unchecked white oak to make the 72 squares I'd need for a 12"x12" board. Well, the 360, because I'd like to make 5.

With...
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seasonal drying takes about a year per inch of thickness, in all likely hood you're working with green lumber. use a moisture meter to check the MC then you can calculate expected shrinkage.
the further from the pith the better.
tiny cubes like that probably wont split if you glue the fuck outta it and seal it.
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>>983587
It takes about a year per inch if it's just outside, you can speed it up quite a bit by going with a solar kiln type design (down to like a week per inch or less) or even just putting it inside where it won't have humidity swings.
painting the ends with 4-6 coats of latex I've heard, yes, also heard good things about dipping the ends in a pot of melted canning/candle wax for branches and smaller logs (so they fit in the pot). Or there are commercial products. it'll reduce though, not prevent.
Also,...
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>>983637
Just use tar for the ends. It's a bit messy but super cheap

File: steel.jpg (104 KB, 766x1024) Image search: [iqdb] [SauceNao] [Google]
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What's your take on sculptable steel /diy/?

http://ropeculture.org/2016/04/22/ferrocement-sculptable-steel/
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>>983523
bamp
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>>983523
>>983524
>posts thread
>immediately bumps
>poorly written article
>old technique
sage
>>
File: 1461104848076.jpg (68 KB, 960x615) Image search: [iqdb] [SauceNao] [Google]
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>the fascist workshop

File: recharge.jpg (109 KB, 1280x720) Image search: [iqdb] [SauceNao] [Google]
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Suppose you were a highschool educated schmuck and you wanted to build an electric car recharging station.

What would you need in terms of technical knowhow?

And what would you need in terms of business knowhow?
15 replies and 3 images submitted. Click here to view.
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>>983505
All you need to do is slap solar panels on it and everyone will pay for it, no one understands energy density anyway. Solar power is the future amirite
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>>983511
this, you may as well literally put one solar panel up or 20. That panel is doing bull shit to charge all those cars. They are getting their juice from the grid.

For business know how, you need to be snake-oil salesman tier. For technical know how, it's not much. It's high amp commercial shit so you should just hire an electrician anyway for liability purposes, you don't want to buy anyone a new car because the station caught on fire and fell on it because you used the wrong sized wires.
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>>983549
Don't even bother hooking up the panels

File: Microcontroller01.jpg (112 KB, 700x467) Image search: [iqdb] [SauceNao] [Google]
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From where can I get 50 lbs of steel fragments which I can use to heat up and shape/mould myself? Google isn't showing me such bulk masses of it.

If there is any knowledge of this, please share. Thank you.
9 replies and 1 images submitted. Click here to view.
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>>983414
scrap yard!?
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>>983417
Nothing!! Spent my entire day searching outdoors.
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>>983419
what are you looking for exactly? sounds to me you want like little 1 inch square pieces or soemthing.

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