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Archived threads in /diy/ - Do It yourself - 174. page
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I am making a rotorcraft that has two petrol engine powered rotors. Obviously to prevent torque induced spinning I need the two rotors to spin in opposite directions. Can I simply start one engine in the opposite direction without any problems? From what I have gathered this is possible with two-stroke engines but not four-stroke. Plan B is to duct them and use control vanes.
17 replies and 4 images submitted. Click here to view.
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>>940019
The only solution that you can use is a gearbox, an extremely simple one, ( 2 gears) .
This because you can't reverse even a two stroke engine.
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>>940019
>two petrol engine powered rotors
you worked out the controls for that m8? You should before you build anything. You may have some difficulty getting the throttle to react fast enough.
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>>940067
>This because you can't reverse even a two stroke engine.
I think you can with total-loss 2 strokes, if you can change the ignition timing. With small engines it's just a dynamo. There may be ventilation issues but that's minor.

The reason you can't do it with 4-strokes is because the valve order is basically fixed by the camshaft. Simple 2-strokes got no cams, just reed valves

(I think?)

"Modern" 2-strokes are closed-crankcase, and have...
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Hey guys, I work in custom decorative concrete overlays and I'm looking for more designs to try to replicate. Post your favorite flooring pics, I'll post a few things I've done recently.
11 replies and 5 images submitted. Click here to view.
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>>939989
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>>939990
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>>939989
Do a google image search for 'geometric floor tile'

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I recently got four of these crappy 13w LED lamps for free. I want to power them but I don't have any inverters. They say 85-277V AC so couldn't I just plug them in to some GX24 bases and wire them up to a wall socket adapter? House voltage in the USA is 120V correct, so it should be just fine...I'm checking here first because I don't want to start a fire/electrocute myself etc.

http://www.ledtronics.com/Products/ProductsDetails.aspx?WP=1835

It's the part number LEDG24QU-13W-XWW-001AW

If I can wire it up to house power, which wire...
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Not really impressed so far with the wiring job
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Yes, you can wire a gx24 socket with standard 110v. The socket will give you instructions for wiring the socket to mains voltage.

To complete this project safely you'll need

soldering iron w/ solder
heatshrink
lighter
enclosure

and possibly
connectors + crimp

mains electricity shorting out, while looking really awesome like electrical fireworks, can easily start a fire. You don't want to be that asshole.
>>
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Basically, only two of these pins work, one on either side...is that normal?

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Anyone keen on helping make me this space more hospitable?
I bought this place 3 years ago and have the kitchen/dining, living, and bath rooms un-bachelorish. But,honestly, I am just stumped in the bedroom. I just got the bed off of the floor last month (and I have a skirt for it somewhere).
When I scoped the place out, they had some sort of fabric lined board against the wall (as a sort of head-board) that had lights (sconce) attached to it. I'm guessing that they were plugged into a socket behind the board thing (not hard wired). I thought that was a good look.
Anyways, I want to get rid of the baby TV, put one at the foot-board wall of the bed, and... that's where I'm stuck. There is a 3/4 bath to the left of that mirror that needs to be put back up on the bedroom door, and a sliding two-door closet running next to it on the same wall.
I'd prefer not having night stands (not a lot of room for them), but I'd like some light besides the overhead (dimmable).
I can't hardwire stuff without massive amounts of cursing, fixall, and tears. I have a drill. And a ladder. I know enough about DIY and home improvement to know that I shouldn't go it alone.
I can show more pics, but it's pretty much this square.
15 replies and 4 images submitted. Click here to view.
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>>939525
Your text is hard to read if you are not trolling, so basically you want us to decorate your room, you need to show us more pictures and tell us the size of the room and the windows and the door and how many people sleep in it, etc
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>>939525
Insufficient data for a meaningful answer.
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sorry, wasn't expecting immediate replies.

>>939527
>so basically you want us to decorate your room

Well, if you want to or have the time...
Sorry for not enough info. Here's a pic standing in the corner where the CRT TV is. Room is 11' x 12'.

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Hey /diy/ i want to make a pipe from this . But i havent made a pipe yet so im pretty stressed out that i will mess it up. Do you have any ideas ?? Its wood from the roots of wine grape
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>>937882

don't.
that wood is cheap as fuck and the only good way of using it is to burn it
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>>938117

Thread\
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>>937882
Neat idea but you DON'T wanna use grape wood for a pipe.

Ironwood would be a good choice.

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Woodwork General #2
I think >>>919720 has hit it's bump limit
198 replies and 47 images submitted. Click here to view.
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Well here goes. I'm looking for a tool / drill attachment that I could use for routing a hole 1" deep by 2" across. Any idea what I might need to ask for? Don't want to make a fool of myself when I go shopping later.
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>>929972
a chisel. a pencil a piece of string. a mallet
a chisel, a hole saw to the desired depth. a mallet
a router.

what is the hole for?
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>>929972
A 2in forstner bit would be the easiest. But you'd need money and a powerful drill press.

Otherwise a router and a circle jig is really the only practical, accurate way.

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What do you know about loupes ?
My eye are getting weaker. would like to work on things at arms length and have a close up look. Been looking at dental loupes but they super expensive. Regular jewelers loupes work fine but you have to hold the work right up to your face. What I need is a close focusing binocular you can wear . What's out there?
6 replies and 2 images submitted. Click here to view.
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>>938459
>Regular jewelers loupes work fine but you have to hold the work right up to your face.
That is because they are far easier to use that way.

The practical problem with using devices such as loupes is that-
1) for a given objective lens size,
2) as the magnification of the lens assembly increases,
3) the depth of field decreases. As it must. There is no way around that.

The reason that a typical 30x loupe requires you to hold stuff 10mm in front of it is because...
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>>938459
If you want to work at arms length a webcam with macro lens and monitor is probably the cheapest solution.
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>>938459
Google OptiVisor

You can get these with different strength lenses. Lower power will let you work farther away. Higher power gives better magnification but you need to hold work close to be in focus.

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Hey /guys/
I got some basic experience in building stuff and handling tools and electronics etc. Now i wanna make my own VR Headsedt. It shouldnt be cheap like pic related, but include headphones, a small mic and yeah, a screen (or however you want to call it).
The screen will be divided in 2 parts by some software and i'll buidl a seperation between those two that i can see the 2 parts seperately. Now my problem is: I need a ca. 4.5-6.5 inch screen (i guess, havent figured that out yet) that is quite affordable. It should have HDMI/VGA/DVI compability, if you got...
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>>938399
screens in many of the major VR headsets are indeed cell phone screens. you should start with a phone with high ppi and remove the screen and figure out how convert its input into HDMI

http://www.phoneppi.com/screen-resolution-and-ppi-of-mobile-phones.html

btw you are better off using a samsung phone with samsung vr because its got its own app store, you can still use it as a phone, and its supported by occulus devs
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>>938399
Search for google cardboard, IIRC some guides that talk about it link to lenses on amazon.
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>>938399
there is a alibaba cardboard version for 2.99$ if the normal 20$ cardboard is too expensive (lol but i imagine if 20$ is too expensive for you, your project is DOA)

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Are these still worthy of existence? Is there a modification one could perform to delay their inevitable perishment?
10 replies and 1 images submitted. Click here to view.
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>>939767
hell I could use one
I would just sell them $10 a piece on CL if you don't need them and they still work
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>>939767
I set one up to work as a radio in my room. There's nice aesthetics on some of those, especially when you prefer analog radios to digital ones for that comfy feel. Mine in particular is a Sherwood CRD-90; I can't even find a picture of that online. It makes it feel really personal.
>>
Keep your eyes open for a Phillips DC-777 (DIN style) automobile radio. It's an early 1990's vintage unit. It was one of the rare dashmount radios that was AM/FW & Shortwave.

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The oak on my knife has shrunk around the metal in the dry Canadian winter, so nothings flush anymore.

What should I do to swell it a bit? Tis treated with boiled linseed oil (should've used tung oil) and epoxied to the metal.

While I'm on the subject, should I treat the sheath with oil or wax?
14 replies and 2 images submitted. Click here to view.
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>>939359
Knife looks terrible. What is wrong with the blade?
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>>939373
Just a little short and wide ( like your mother)
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>>939375
Looks really shittily made. Like a bad bevel and what not. Looks like YouTube tier diy aluminum lost foam casting

I am looking to do some mold-making at home using silicone for molds and resin for the casting material. I design figures/vinyl toys/custom console shells as a hobby and want to get more serious about it. I have done so successfully with some kits from Hobby Lobby (Gotta love those coupons) but long term it is not a viable option.

I am looking for websites that sell from the US for casting resins. The one that seems the most useful is the EasyFlow 60 casting resin. My only issue is that molding and casting shells for handheld game systems means the plastic has to not...
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Here is an example of what I have already done, just looking for better places to get materials.
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>>938793
http://lcamtuf.coredump.cx/gcnc/ch4/

Scroll down to "4.1.3. Rigid polyurethanes",

He has some recommendations towards the bottom
>>
haven't done any in a while, but I've used
http://www.brickintheyard.com/
quite a few times in the past

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Sup /diy/. I stole a stolen shopping cart out of the ditch the other day and i want to motorize itwith an old pushmower engine but because the pto is vertical and the wheels (which will be replaced) are horizontal plus on top of that i need a way to engage the wheels and give it variable power.

Ideas?
24 replies and 7 images submitted. Click here to view.
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>power to the ground
You'll need to either add wheels or replace the rear ones with some kind of axle setup. At the simplest you could have a gear mounted on the axle with a matching worm coming from the engine.

>variable power to the ground
A gearbox of some sort is really your only option without modifying the engine to have some kind of throttle control. A small used tranny could be picked up for relatively cheap at a local junkyard, or a throttle body even cheaper.
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>>937145
I hadnt thought of a gearbox or tranny. Ill probably do that thanks for telling me
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>>937149
Not a problem. Before you go out and drop $100 on a tranny though, make sure you can fabricate some kind of coupler to connect the two. It should also go without saying that you'll need a manual one unless you're a master at electromechanical wizardry.

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Did I buy a shitty bed frame? These bolts just slide in and out of the frame, I can't tighten them and the bed feels like it's gonna fall apart at any minute.
16 replies and 4 images submitted. Click here to view.
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>>939882
You cant tighten them as in you can't force them into the material any more than you have, or that they just pull out immediately?
If A: Try harder or go buy a drill or impact driver or something and force that bitch in.
If B: Take the bolt out, goto the hardware store, and get one slightly larger.
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>>939882
It looks shitty. Ikea?
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>>939884
They pull in and out without any pressure at all, I've tried using the allen key but it does nothing.

>>939886
Brought it second hand, description said everything was fine with it.

Is it difficult to cut nice smooth curves from MDF?
10 replies and 2 images submitted. Click here to view.
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>>939753
Using hand tools that should say. I have no particular machinery.
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>>939755
a little, just sand it down well and you shouldn't have any problems.
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>>939766
Jigsaw do ok though?

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can someone please explain to me how these things actually work? all the instructions i've found online so far have just left me with more questions than answers

the arduino libraries allow you to daisy-chain them together and address each one individually. how is that possible? from what i understand so far, the only control signal they accept is a 24-bit RGB value. there's no back and forth communication with the microcontroller. each one has only one input and output, so how can they be individually controlled if all they do is accept a value and then hand...
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>>939613
If you check the datasheet for the ws2811 ic that is used you see that you send three bytes and that sets the first pixel. The next three bytes the first pixel is already set so it sends them to the next in line.
A reset resets everything.

At first I thought it was just a shift register type deal but the datasheet is such shit engrish its one way or the other.

So not exactly addressable, you have to throw everything out and reprogram all of them to change one led
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>>939613
>address each one individually.

Simple. You send a string of 24 bit values to te first LED input. Each 24 bit 'word' is 8 bits each of RGB values. The first LED picks the first 24 bits off the string and sends the rest to the daisychained LEDs. Each one picks 24 bits off and sents the rest on.

So you can set each LED to a unique RGB value. You cannot send a single RGB value down the string addrressed to one LED in the middle. You have to pack the string with at least...
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>>939625
>>939627
thanks for the responses, it makes a lot more sense to me now.

so if i'm interpreting this correctly, each LED has a 24 bit input buffer that retains its contents temporarily so long as it's receiving a data/clock signal. once the buffer is full, the overflow gets passed to the output until the signal stops, then the buffer automatically clears after a specified period

for example if you had three leds you wanted to first make red, green,...
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