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Archived threads in /diy/ - Do It yourself - 115. page
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I've been getting into crochet recently as a way to pass the slow hours of the night shift. This is my latest work in progress: a circular rag rug crocheted from a ball of bedsheet strips. It's a lot easier than I thought it would be. I think I'll try making a rag basket next.

Do any of you other /diy/kes crochet, knit, sew, or practice other fabric crafts? Show off your creations in this thread, ask other anons how they made their stuff, etc. Anything goes.
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That's cool. Don't listen to the negative people on this board. They're just jealous.
i crochet a bit but my favorite sewing type skill is tatting. Long ass needle creating really intricate stuff :)
Got any pics of your gear, works in progress, or finished pieces?

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15 years of red clay stain on brick. Power washing does nothing. Bleach does nothing.

Am I just fucked?
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did you try pressure washing it?
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looks fine as is.

some people have to pay to get that graduated color look. you got it for free.
Yes, did nothing

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Im trying to make a home made electrolysis rig that I can use to split water into H2 and O2, and then direct the two gases into separate balloons for storage. The whole rig will be a closed system, thus allowing it to pressurize itself enough to inflate the balloons. I already have a pretty good idea of the design and how Im going to build it, with one exception. I cannot for the life of me figure out what to use for the electrodes. From past experience, I have determined that it must be both conductive (obviously) and also completely non-reactive. If copper, aluminum, steel,...
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Why do you want to build this OP
>"The whole rig will be a closed system, thus allowing it to pressurize itself enough to inflate the balloons."
>enclose system in air-tight container
>begin electrolysis
>gasses fill balloon to pre-flex apex
>gasses then begin to fall back into the container due to lack of force to fill the balloon
Good luck, OP.
that is why it is sealed. so the increase in total pressure keeps that from happening.

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When dealing with breadboards it is of utmost importance to distance all similar things equally. Trimming component legs is only acceptable if all components are trimmed equally. When laying out passive components it is of utmost importance to insert components such that their respective values all face one direction. Resistor color bands must always be aligned. For functionally similar connections, wires of exactly the same color must always be used. And so on...

If you stray from these simple rules, know this: somewhere, in a small, but highly organized room there is an autist screaming of pain.

So I guess this is a thread for things that just make you feel warm inside. Like super neatly organized cabling etc.
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posting sloppy perfboards because I'm feeling edgy

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in other news I have a wired programming question.

I have a rotary encoder that'll be reading tens of thousands of revolutions at a time and a device which will send signals at irregular intervals.
I need to record and export the number of revolutions(to the single or half revolution if at all possible) between signals(and between startup and the first signal) onto an Excel spreadsheet.

does anyone know of a good Arduino to Excel interpretation and recording software?
253 replies and 38 images submitted. Click here to view.

Do you need the spreadsheet to be filled out in real-time? If not, Excel is capable of reading text-based files just fine. I think if you give the file a .csv extension it might just work automagically.

Does the Arduino have a counter circuit? You might need to buy one to work with the encoder.
Made a standalone with built in ds1302, 74hc595 for driving a LCD and triggering triacs. Uses an atmega328 and I program it with an arduino mega as ISP.
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Also OP, your best bet is to read up on C# and the APIs that exist to interface it with excel.

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Thread that contain small insignificant questions that don't need their own threads, here is a thread where they can all go.
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Can /diy/ tip me some methods to destroy a fair amount of letter-papers without having a paper grinder ?
Any lawnmower or something ? Letting it under autumn rain ?
Burning is obviously the easiest. If you have a good fan over your oven you could throw them in there on self-clean.
Burning it ? It'll probably be annoying depending where you live but we ain't in summer anymore.

People in my area burn fallen leaves in late Autumn. Pretty sure it shouldn't be a problem

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Give me the most crazy ideas for useless inventions you can imagine!
-It must be quite easy to do
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Computer script for posting this type of post on 4chan.
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the kickstarter / crowdfunding sites are full of them

also here is more-complete version of OP pic

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A plague of rats has visited my farm.They are everywhere.How to kill these creatures.
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non kosher food

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Hi, this is my new project. A mini mincer for guys with autism.
it's fantastic. can be completely dismantled and re assembled in seconds. That means it's portable everywhere.
You can use it at the restaurant for smashing bread.
At breakfast for smashing cornflakes.
Or imagine it at the park with hundreds of insects... A drug for a person with autism.

I'm going to do a kickstarter for this. what do you think?
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Beech wood
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the reels
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carbon fiber and aluminium plates.

motors with 70rpm and 10kg/cm each.

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/ohm/ - electronics thread
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anyone have experience using photo Interrupters?

how accurate could this one be if i was to program a microcontroller to count the interrupts to determine a motor's position?

What happened to our OP?
We used to have a pastebin.
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I am trying to compile a shopping cart of components for the matchless metal detector found here: http://www.geotech1.com/pages/metdet/projects/matchless/matchless150c.pdf

Can someone look over it and let me know if it looks good? I wasn't too sure about the following:

14 pin DIL IC socket (I could only find exact on ebay for ~$17)
ICM7556IPD (Ebay)
BC549C(Again, could only find on ebay)
.01uf ceramic disc (listed as 50v, will this work?)
500ohm pot in place of 470ohm

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So what have you guys done today?

I finally started spraying color on my car.

Razor blade stripped it to the gel coat and put rustoelum white primer on it 3 months ago.

Filled all the nicks and sanded a million times.

Now im spraying Baer High gloss exterior enamel in Cobalt blue.

Before I get flamed. I bought the car as a resto-MOD. 76 corvettes arent worth much and this one had rusted out floor pans/worn out engine.
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More pics.

I need to pick-up more paint and a better gun.
Harbor Freight "detail" HVLP gun. Pain in my ass.
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This is only the first coat.
Im planning on 4-5 coats with sanding after each one.
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Last pic.

One I get a smooth finish I will buff the hell out of it and wax.

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SO, I happen to have a JET J-720R.

I'm an idiot though so I have no idea what sort of vice will fit the damn thing.
it sits very sexily and glares at me for using 2"X4"s and clamps in lieu of a proper vice.
what reasonably priced vice can I get for it?

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currently using this at school


id's breddy cool, although the heidenhein control makes me rage sometimes
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You can use any sort of machinist vise. I'd get a 6-inch angle-lock Kurt style. Also you could just use a hold-down kit.
That thing isn't really for machining though.

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So, I'm one of those who got drawn into electronics via drones, and I've found that there's a lot about soldering and the various connectors to learn about.

I do believe that this is a deep enough and different enough topic from general electronics to warrant it's own thread.

Anyway, here's one of the better writeups I've found on the topic if you're learning.


Now, I also have a question -- I know Weller is the go to brand for serious soldering irons: is there a decent...
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Weller irons are already less than $20, how cheap are you looking to go?

My understanding is that cheaper soldering irons sacrifice temperature accuracy. If you're not working on anything too delicate (thin PCBs or tightly packed sensitive components) then any old soldering iron should do the job.

But I don't solder much. Take that with a grain of salt.
>Weller irons are already less than $20

I'm more talking about things like:
got a bargain on a wsp81 on ebay. i think the model is discontinued but tips are plentiful and the unit is real sexy.

weller is pretty much universal
other brands definetly depends where you live.
e.g. i never heard of hakko before /diy/

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Hi /DIY/. I was wondering if you can offer a little advice on my costume. Basically I'm doing a classic robot, complete with cardboard boxes and that flexible aluminum tubing (basically like pic related). I'm building a couple of things to make it a more realistic robot, eg flashing LEDs, robot voice box, etc. I want to include a couple of motorized functions, which is where I need your help. I already have an arduino uno and two motor sheilds.

First motorized function is to make the head spin all the way around. Keep in mind this is basically just one cardboard...
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A picture of the fuse box I want to mount.
IMO easiest way to achieve the spinning head would be to mount the motor on top of a hat or helmet, and have the robot head be attached to the motor and not attached anywhere else on the costume.
That's a pretty good idea. I can mount the electronics, including the motor, on top of a helmet. How much motor, and how much battery would you think is required? I was initially thinking of wiring 2 big 6 volt lantern batteries to make 12 volts that would last all night. I was thinking mount the batteries in the chest and run a pair of wires up the back of the neck to the helmet. I was thinking of a motor like

Does this seem like enough?

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Tig Welding student here. 1st month, I have 3 to get the trade. Any suggestions you guys can offer would be appreciated.
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yeah, Aluminum over heats too quick. Keep a rotation of practice pieces going so you do not keep practicing with a too hot piece and you get a different weld each time
I'm currently trying to walk the cup and its a bitch
patience... seriously.

Rotate between 3-5 pieces you have set up. If your instructor says anything... explain why. You will actually spend more time welding rotating pieces than to stop and let shit cool.

When you get fucking pissed...which I am sure you will; take a break. Smoke, get a drink, do push ups.

If you are doing fine precision work avoid stimulants....like coffee.

Smile.Take you licks and fuck ups in stride and bury them.

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