File: 1360670366542.jpg (116KB, 1024x685px) Image search:
[Google]
116KB, 1024x685px
So I was on the shooting range and right next to those real weapons there were guys playing with those laser toys. They were in shape of real pistol, inside there was a laser and when they pulled the trigger, the laser was getting activated.
So I've been thinking, that maybe I could build such a mechanism myself. Benefits:
>I could practice shooting at any time.
>And I would pay no money for it, once the system gets implemented.
>And while it would certainly not replace standard range practices, it might certainly limit them.
What I want to have:
>Fake weapon with guts removed from it.
>With laser inside
>With something to generate fake knock back inside the weapon
>Make it emit sound through headphones, preferably those would be connected to some other device, not directly to the pistol.
>Make the target reacting to laser
How I plan to do it:
>Buy fake weapon, since they are legal around here.
>Buy laser pointer toy
>Dismantle both, attach one to another by whatever means - I don't think its going to be any troublesome.
>Sound issue: put raspberry Pi zero inside, attach wifi module to USB. Module sends signal to cellphone through WiFi, cellphone through specially written app sends signal to headphones to emit "bang" sound.
>Raspberry Pi zero is powered by the battery.
>Target reacts to laser pointer and sends signal to ATMEGA8, that will collect points and pottentially measure distance from previous shots in some similar to clustering fashion.
>Atmega sends data to digital point counter.
The questions, that are worrying me, though are:
>How do I simulate the knockback? I plan to use it in my flat, surrounded by neighbours. So it must be something silent. But I have no idea how to generate such a force, even with making the noise. Without making noise, it seems very hard.
>How do I make the target? What material generates or loses power, once laser beam hits it's surface? Since I'm a programmer, I have no idea.
5 Posts / 2 Images
View this topic
>>
>>1132631
>>How do I simulate the knockback? I plan to use it in my flat, surrounded by neighbours. So it must be something silent. But I have no idea how to generate such a force, even with making the noise
solenoid with movable mass in a tube& a return spring
rumble motor from a controller
>>
Get a gas blowback airsoft pistol, and fit it with a laser in the barrel. It will be a fraction of knockback, but it should get the point accross
>>
File: temp2.0x0.jpg (45KB, 720x293px) Image search:
[Google]
45KB, 720x293px
>>1132631
They make laser bore sights that chamber into a Real gun..
File: dark-forest-and-bird.jpg!Large.jpg (101KB, 750x592px) Image search:
[Google]
101KB, 750x592px
Anyone know good brands for 30k lumens bulbs?
5 Posts / 3 Images
View this topic
>>
File: like a laser pointer but for big guys.gif (992KB, 497x309px) Image search:
[Google]
992KB, 497x309px
that's arclight territory, what the heck are you building?
and the answer is osram, obviously.
>>
File: pepe_thc.jpg (41KB, 499x499px) Image search:
[Google]
41KB, 499x499px
>>1132571
>>
>>1132571
I assume you are looking for bulbs for a t5 set up? After years of buying expensive bulbs I go with GE bulbs my reasoning is the price I can afford to replace them regularly.
File: crossover.jpg (176KB, 1280x945px) Image search:
[Google]
176KB, 1280x945px
How does a passive audio crossover get affected by two speakers wired in series? All I can gather from google is that it may affect the frequency range that the crossover was designed for. What do? HALP!
4 Posts / 1 Images
View this topic
>>
>>1132551
Two of the same speakers? Half the impedance expected by the crossover?
Give us details anon, parts, specs, objectives
>>
>>1132551
https://en.wikipedia.org/wiki/Low-pass_filter#Electronic_low-pass_filters
for passive filters,The cutoff frequency is 1/RC
In series you'd be doubling the resistance R
so you'd be reducing the cutoff frequency effectively lowering the crossover point by half
(ie 100hz instead of 200hz)
Besides that it should work perfectly fine.
If you put them in parallel you'll double the crossover point, however you have to be careful, lowering the impedence can draw more current than your amp can supply (and 'possibly' more than the inductors in your crossover)
>>
>>1132551
and this is for a super simple crossover.
a lot have measures to negate the affects of both the points mentioned above.
File: 20170217_083042.jpg (3MB, 5312x2988px) Image search:
[Google]
3MB, 5312x2988px
Hello ladies and gentlemen.
I wonder can anyone throw me some ideas for a frame to hold a sign and strips of LED.
The image is laser cut on .8mm stainless steel.
I need an idea for a light, simply constructed frame to hold the strip if LEDS to surround the sign.
I've been thinking of 10mm thick alluminium strips but that would involve alot of drilling and tapping to construct. Not to mention weight.
I also thought of polypropylene and glue.
Or strips of wood tacked together.
I really don't know so hoping ye might have ideas.
Excuse the fast sketch.
4 Posts / 2 Images
View this topic
>>
My local hardware shops have aluminium profiles that you could use. They have pieces that you can stick into the ends to make corners; they actually look okay.
You could look at frames for pictures; they aren't that expensive and save a lot of time.
I'd recommend a sheet of acrylic behind the front panel to dispense light.
>>
Thank you very much for your reply.
That's a great idea. I will look into it.
>>
File: FB_IMG_1487273113590.jpg (38KB, 540x960px) Image search:
[Google]
38KB, 540x960px
>>1132367
I actually made some of these. I used some trim boards from lowes that had a channel pre cut in it. Just cut and nail together.
Far as leds go. Diy yourself somehow to save cash or use smd led strip.
Have thousands in leds...
Wasted money.
ALPENA (MAX) LED STRIP IS ALWAYS THE ONLY ANSWER.
>pic very related.
>my bike.
File: img-96.jpg (97KB, 564x564px) Image search:
[Google]
97KB, 564x564px
Misters, i have found this site over here.
http://www.survivorlibrary.com/?page_id=1014
Im not sure if someone already posted this, but just in case... It has many century old books about clock/watchmaking, steam engines, wood working, bookbinding, forging and casting, etc etc etc. read the warning below categories.
Sorry if my english is to bad.
4 Posts / 2 Images
View this topic
>>
too*
>>
Not OP, but heres another site with a lot of books, manuals, and catalogs about vintage machinery.
http://vintagemachinery.org/
>>
File: img-63.jpg (142KB, 700x996px) Image search:
[Google]
142KB, 700x996px
>>1132224
Thanks, didn't knew about this one.
File: il_570xN.965917012_fd9y.jpg (34KB, 570x380px) Image search:
[Google]
34KB, 570x380px
How do I make conch beads?
Specifically, spherical beads.
4 Posts / 1 Images
View this topic
>>
>>1131859
I'd imagine cutting plugs and then tumbling them down with a rock tumbler would get you there eventually.
>>
>>1131859
are they going in your butt?
this is an important question.
>>
>>1131997
No.
Anonymous
Making most as efficient LED lights as possible 2017-03-02 04:37:24 Post No.1138718
[Report] Image search: [Google]
Making most as efficient LED lights as possible 2017-03-02 04:37:24 Post No.1138718
[Report] Image search: [Google]
File: grow-led-8166.jpg (1MB, 1500x1000px) Image search:
[Google]
1MB, 1500x1000px
Making most as efficient LED lights as possible
Anonymous
2017-03-02 04:37:24
Post No. 1138718
[Report]
[View this topic]
I am planning to make own LED light setup.
What interests me the most is efficiency.
230V 50Hz installation
Highest efficiency possible is what interests me, so LED will be driven with 10-20mA current max and voltage will need stabilization. No transformer, just long chain of LED, might even lengthen chain and use internal diode resistance instead of resistor (known, yet rarely practiced method 70-100 LED chain surely does have some resistance)
Should I replace diode bridge with MOSFET switch? and how to stabilize voltage enough to prevent pulsing, replace cap with something else? use choke instead of resistor?
Or there is other way I have not thought of using? like chain of LEDs directly, instead of diode bridge? however I have no idea how to stop pulsation in this case.
14 Posts / 5 Images
View this topic
>>
>>1138718
Use a constant current driver like a normal person?
>>
>>1138718
If you are planning on just using led for bud growth you will be very sad.
>>
>>8716103 (OP)
>just long chain of LED
http://www.ledsupply.com/blog/wiring-leds-correctly-series-parallel-circuits-explained/
You really need to hook them in Parallel or at the very least groups of Series-Parallel. A bunch of lights in Series can result in thermal runnaway as well has a few lights hogging all the power from the others.
File: IMG_5221.jpg (1MB, 3264x2448px) Image search:
[Google]
1MB, 3264x2448px
Where would Air bubbles get trapped in this mold?
15 Posts / 5 Images
View this topic
>>
why are you making a weapon?
why can't you do something useful with your life?
>>
>>1138570
What direction are you pouring it from?
>>
>>1138578
From the middle of the side blade. I cut a glue stick and stuck it there. Hard to tell from that picture
File: Stealth-Force-8.0.jpg (248KB, 1200x1200px) Image search:
[Google]
248KB, 1200x1200px
Hello DIY
I don't post in fa/ because they do not know what manual labour means
I'm a metalworker/welder and I really need a new pair of shoes. So, what is for you the absolute god tier work shoes ?
Bonus if ankle boots
Pic related, my magnum that I use for hiking, can't use them at work because no security shell
18 Posts / 5 Images
View this topic
>>
>>1138332
Check out the Timberland PRO series. Lotta options but all are comfortable and sturdy
>>
those are piss poor hiking boots, stop doing that
>>
Only sensible option is Blundstones. Everything else is a piece of shit and made in China
Anonymous
Leatherworking General part deux 2017-02-28 07:30:18 Post No.1137802
[Report] Image search: [Google]
Leatherworking General part deux 2017-02-28 07:30:18 Post No.1137802
[Report] Image search: [Google]
File: 20170228_112752.jpg (3MB, 2117x2117px) Image search:
[Google]
3MB, 2117x2117px
Leatherworking General part deux
Anonymous
2017-02-28 07:30:18
Post No. 1137802
[Report]
[View this topic]
More like MY FUCKING GEOMETRY CLASS LIED TO ME GENERAL
The fuck did I do wrong. I measured this shit out to 7 digits of pi
20 Posts / 3 Images
View this topic
>>
Calculating circumference rarely works out in the real world.
mark every 45 degrees (or less) on both parts and check alignment as you go.
I used to make templates for cutting steel pipe.
Always got the circumference by wrapping posterboard around it because that's the only way to get it right consistantly.
Also, any diameter measurement error is increased by a factor if PI.
>>
>>1137805
>Calculating circumference rarely works out in the real world.
glad I went to skool
>>
Is OK making a quiver?
File: 019442324810.jpg (28KB, 900x900px) Image search:
[Google]
28KB, 900x900px
I just bought a long piece of 3/4" pipe but had it cut to the wrong size(too short) because I'm a stupid motherfucker.
So whats some fun stuff I can make with it?
IN B4 PIPE BOMB its too small diameter for that.
16 Posts / 4 Images
View this topic
>>
>>1136804
They now sell painted pipe fittings as parts for furniture, shelves, decor, etc for 10x the normal price
make a towel rack
or a pipe clamp
a flag pole
or get it cut and threaded down to sizes you need next time
and glavanized or black steel?
maybe you can make a giant dart gun with a compressor
>>
>>1136811
Yea, black steel.
>>
>>1136804
buy a tubing bender head
buy emt conduit
bend to hearts content
File: IMG_5392.jpg (32KB, 326x350px) Image search:
[Google]
32KB, 326x350px
How are the holes drilled in fitness equipment such as this? The steel is usually around 11 gauge or so. I was thinking it could be flow drilled with a flush cutter, but the inside of the hole doesn't have the telltale build up.
15 Posts / 3 Images
View this topic
>>
Punched out at a factory.
>>
>>1136156
this or maybe plasma cut on the high end gym eq.
>>
>>1136155
Impact Drill + 6 Hole Saws + 6 Full Batteries
File: DSCN1066.jpg (3MB, 4608x3456px) Image search:
[Google]
3MB, 4608x3456px
Rate my first attempt at a vambrace. Not sure if I like the crease in the front; can I dish that back out or no? I also might just use this as a test piece for other techniques like fluting and stuff since the steel is only 22g and useless as armor.
I want to try a pauldron next, again in 22g until I get the hang of it better. How necessary is a ball or dishing stump for a piece like this? I only have a shitty Harbor Freight anvil and 16/32 oz ball peins.
39 Posts / 20 Images
View this topic
>>
>>1134181
Looks better than my first attempt, in 1973.
I was an early SCAer. es, Gramps here,
>>
File: goll-milanese.jpg (29KB, 379x800px) Image search:
[Google]
29KB, 379x800px
far too little planishing. you've got the bag of marbles texture going on all over it. thicker stuff will help there, though.
crease isnt ideal at all.
Taper on the vanbrace as a whole is a bit narrow, unless you're thick wristed and no forearm. Generally, you dont want to have it absolutely straight - real armour has curves, every element is flowing - look at how this one curves rather than being straight. Look at the real stuff as much as you can.
it may be crappy, but I'd also emphasise, finish it. that includes making hinges and strapping. that will teach you important skills for later.
While its good to try rolling, remember rolling every edge isnt always right. Unless your name is blankenshield...
the upper roll may well be superfluous. in fact i would be inclined to say its too deep and square. real ones should have more angling to the edge, so you dont get armour-bites when you pull the elbow in. currently, that's likely to bite into the inner elbow.
The Armour Archives are your friend, you will learn a shit-load there.
>>
>>1134187
what do you mean freon cans are not historically accurate?
(I'm no sca'er, but I know enough of you lot...)
Hey /DIY/ what do about bed bugs?
60 Posts / 5 Images
View this topic
>>
>>1132376
Burn your house down..
>>
>>
>>1132377
>This
No seriously it's the best option, and leave everything inside those fuckers are cheeky
File: 20170227_120400.jpg (2MB, 3264x2448px) Image search:
[Google]
2MB, 3264x2448px
Hey /diy/, I have a strange problem that plumbers seem unable to solve. Basically I've determined that water gets contaminated when it's running through the water heater and acquires this strange odor. I know this because I can smell the odor when hot water is running, but not cold water. To ensure that the water isn't contaminated before it gets to the water heater, I've taken some cold water and heated it up on the stove to see if the heat was what was activating the smell. Since that water didn't smell, I figured it must be the water heater.
So with that preface, I will dump pictures of my water heater because, although I've tried to do my own research already, I really don't know what I'm doing or what I should do. I read about replacing the sacrificial anode (it's a gas heater), but I can't even find it on the water heater. One of the plumbers I talked to said to try tightening the gas line, but I don't think that is the problem and I wouldn't even know how to do that anyway.
61 Posts / 9 Images
View this topic
>>
File: 19UoHIi.jpg (103KB, 851x1125px) Image search:
[Google]
103KB, 851x1125px
>>1137155
oops, hopefully this fixed the image.
>>
What does it smell like?
>>
File: ovAi0RY.png (842KB, 846x1124px) Image search:
[Google]
842KB, 846x1124px
>>1137161
Honestly I couldn't tell you. I've read that it could be hydrogen sulfide, in which case it would smell like rotten eggs. But it doesn't smell like rotten eggs exactly. It definitely smells bad, but apparently not even everyone can smell it. So the ability to smell whatever it is may be genetic. Maybe its just a very slight rotten egg smell?