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Archived threads in /diy/ - Do It yourself - 75. page

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diy car neon lights?

I was thinking of buying one of these rgb led strips with remote controller. Any suggestions?
15 posts and 6 images submitted.
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I suggest killing yourself you ricer cunt.
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>>1209651
This

If you want an underglow type of effect, I would suggest buying LED strips of the specific color you want. I see too many people that buy remote controlled strips and then just have a rainbow effect on their cars which looks absolutely terrible. Just remember, anything can look tasteful if done correctly. I drive a pink mercedes from the 80s, tons of compliments, just have to do it right.
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>>1209651
I need the lightning to make my death look better

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I've bought some dimmable LED Lights. The dimmer must be leading edge, as the lights flicker and dim strangely.

Is it simple to install a trailing edge dimmer for use with these bulbs? LED Dimming seems to be hit and miss from everything I've read.

Thanks for any help.
8 posts and 2 images submitted.
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staged LED lights make more sense
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>>1209626
http://www.bowdenshobbycircuits.info/page5.htm
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>>1209618

Installing a different dimmer is generally simple, unless it's plastered in or something equally retarded.

Of course trailing edge dimmers are more expensive and the whole concept of using a dimmer designed for AC lighting with LED bulbs hurts on an aesthetic level.

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Hey so me and my roommate are remodeling the down stairs/basement to rent out and were having a few issues. The Main issue is a presence of water behind a retaining wall in the basement, which is accessible through a door that goes into the crawl space underneath the house.

The house was built (In the 1920s I believe) on a hill, so during the rainy seasons the water will run down the hill and collect behind the retaining wall, under the house. It seems that the owner had once dug a trench to help reroute some of the stagnant water, but nobody had lived here for 11 years before we moved in( about 5 months ago) so the trench had since been filled with dirt and foliage over the years.

We have someone who is planning on moving in beginning of next month and I'm worried we wont have it ready in time because the moisture is causing too many problems and is undoing the work we have already done.

We need to fix this as fast as possible and get rid of all the moisture to continue remodeling.

Please Help
10 posts and 2 images submitted.
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This is the other side the retaining wall inside the basement.
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I would start by digging out that trench again
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>>1209594
Clean out the trash. Make sure there is no wood to dirt contact anywhere. Dig out that trench again and maybe even look into installing a real drainage like a French drain or some such.

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Hey guys! Cosplayer from /cgl/ here. I'm currently working on a cosplay and am wanting to make a Chain Chomp. Problem is I want it to be animatronic and have it open and shut its mouth at a switch of a button. I've tried google but I can't find anything whatsoever. I have a very open budget. Thank you!
6 posts and 2 images submitted.
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>>1209288
Old car windshild wiper motor, relay, battery, switch.

Done.
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>>1209295
Servo would be simpler, lighter, and less energy.
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>>1209298
Cheaper for me too! Thanks both of you! I assume I'd build it like a windscreen wiper and it'll do the same thing?

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I have a 150w laptop in need of a power supply. How safe is it to get two weaker 19v power supplies of the same make and run them in parallel?
13 posts and 2 images submitted.
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>>1208967
it just wont work, probably no damage
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>>1208967
no it won't work. don't open wall adapters up, the caps in there can seriously hurt you.
if you find a wall charger that fits the plug and has the correct voltage output, it'll work. the amperage doesn't matter to much, because of ohms law. just make sure that it has enough amperage to supply the laptop.

but this is /diy/, let's get carelessly creative and dangerous

whatever voltage your laptop is, figure it out. get a voltage step down transformer that can handle 120V input, make sure it steps down to the voltage of your laptop's rating.
the voltage output will be the desired voltage but it's AC. laptops use DC, so get a bridge rectifier and solder wire from the transformer out to the AC in. now you'll have + and - output. attach a polarized capacitor, id say 1-20 microfarads, rated at 200V or more.

make it more stable by adding a regulator at the output.

this would literally be the shittiest ac to dc adapter ever. hell i don't know if it'll work, i think it will tho.

just buy one.
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>>1208967

You can totally run 2 switching power supplies in parallel. Just make sure they are the same brand and model, and to test them for a couple minutes first, making sure that they don't heat up or buzz. Most of them can handle the load, but some can't and they pop really fast.

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Is there any real noticeable difference depending on how you install a butyl sound deadening mat (provided you use about the same amount)? I have some panels to dampen for general vibration.

Please only people with experience, no internet pros
9 posts and 1 images submitted.
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gonna give this a single bump
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>>1208854
>Please only people with experience, no internet pros
>comes to /diy/
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>>1209715

Exactly. House painter guy here. No way I'm gonna share tips with this clown.

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What's the highest temperature commercially available ceramic? I've been looking at castable ceramics maybe for a foundry or something, but I'm also just generally curious about these materials that can hold up in extreme conditions
37 posts and 3 images submitted.
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>>1207852

Just found this out myself, when musing over whether it was even possible for industry to cast tungsten (spoiler: it's not economically feasible).

Most refractory materials known are tantalum carbide, hafnium carbide, and tantalum-hafnium carbide.

https://en.wikipedia.org/wiki/Tantalum_hafnium_carbide

>Ta4HfC5 was manufactured by Goodfellow company as a 45 µm powder at a price of $9,540/kg (99.0% purity).


And I thought the $4/ea I paid for insulating firebrick was a bit of a ripoff.
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Magnesium Oxide is fairly common and very refractory (5000 F). You could probably pick up a bag of the powder at a local pottery supply. not too sure about making shapes out of it but i know you can bond it with either sodium silicate(works ok) or colloidal silica(how its done for steelmaking). both also available at a pottery supply btw.
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>>1207885
What are your tips on creating tiny (2-3 mm diameter) spheres out of alumina? They would have to withstand 800-900C.

I remember trying a couple of years back but the formed balls were falling apart to dust at low temperatures.

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hey I'm in New zealand unemployed and a kinda a drinking junkie 21 recently
I have always dreamed of owning a food truck/caravan but have never found much guides online in terms of pdf or directions would anyone here be able to help me.
something like this please
i also am not a able to get a license as i am disabled i earn 150 a week
25 posts and 3 images submitted.
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>>1207844
Where I'm at it takes about $20 grand USD to build and stock. This is before licenses and inspections. How much money do you have to invest in this? If the answer is 150 a week, just walk away from the thread my friend.
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You could probably get a box trailer and cut a hinged hole in the side. Mount a metal counter inside and bolt down some propane burnerss. Install a sink and water tank. Shelves and a space for a mini fridge. sounds like a lot of metal work. Also you need some vehicle to tow it around and a generator for the fridges
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>>1207844
be better looking 2nd hand (in a city, pref.) - can assume you more or less need to renovate everything, but, thats more or less time rather than money then. Even then, you are looking at maybe $5k for even the most basic basics. The rest is having a good idea, hard work and LOCATION - and a lot of BS getting permits and stuff, extent of which dependent upon your locale, you probably need some type of food hygiene qualification / course but.

Go see if you can work for someone already doing similar, or bar/food/market for a bit first, for experience rather than money - it is a shitload of work, and you need to be the world s most reliable cunt running a truck, be there rain, hail or shine, every-fucking-day.

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Is it possible to shrink a 50/50 polyester blend printed tshirt?
6 posts and 1 images submitted.
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>>1207628
Yes, unstitch, cut and restitch.
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>>1207631
Is that the only way? I doubt I'd manage a good job.
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>>1207632
Could try a heat gun, but it might not look so pretty.

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I got a manual meat grinder for cheap at a flea market. Insides are greasy from previous use, and I wonder what's the easiest method to clean it.

I thought of NaOH, but it's made of aluminium.

Ideas?
38 posts and 3 images submitted.
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>>1205958
cheapest, safest - dish soap, sponge, & labor

are you sure it's aluminum? all the hand meat grinders i've seen are cast iron (all the parts)
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>>1205958
>NaOH
use this >>1205961
and to be sure put it in boiling water to BTFO all the bacteria
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>>1205961
>>1205964
I think it alu, not sure though. I once had a similar one, and it got fucked up in the dishwasher, just like alu

I soaked it in almost boiling water for about an hour now and scrubbed it with a little steelbrush and soap

Annoying are just the little corners which you cannot reach

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If you don't know what Soylent is already, it's a powdered food substitute. Measure it out with a spoon, mix it up, drink it for lunch. I want to make a machine that will automate the measuring, and maybe the mixing later on.

My plan is to have a small 8 segment display and a few buttons to allow a certain number of calories of Soylent to be selected. Once the selection is made, the machine pours the powder onto a scale until the right weight is on it, based on the nutrition information. Typically this is around 109g for one meal, which has a volume of half a cup or so.

The electronics side will be done with a PIC microcontroller, some basic IO stuff, and pressure sensors to measure weight. The main issue is going to be slowly dispensing powder. The existing powder dispensers I've seen are for biomedical companies who need microgram precision and are way outside my budget. So my thought is to use something like the food dispensers in the picture, and have the crank be attached to a motor. Issues that I can foresee with this are:
>powder dispensed in too granular of a quantity, e.g. one compartment of the waterwheel-like mechanism holds 30g, can't dispense a partial compartment, so I'll be over- or undershooting
>hard to attach the motor, since I'm not a mechanical guy

Anyone have any thoughts? Are my fears unfounded? Is there a better way?
104 posts and 12 images submitted.
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>>1204636
just eat normal food like a normal person
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Get a smaller dispenser hook the motor controller and the wheigth meassurement together. Programm it to do one material at a time build your mix from there.

Like material 1= 10g, 2= 10g 3=30g.

Start with Motor one Put in till you hit 10g start Motor 2 till 20g total mass and so on.

Should not be that hard to wire a Motor to your feeder boxes. Could propably try one of these electronic mills where you would just need to controll the on/off switch.
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Archimedes screw.

Summer is here and I have time to complete my projects, so I'll be ordering a bunch of components at once from Mouser to get free shipping. Let's share our favorite components and expand our collection together.

>What components have you bought recently?
>What components are a must in your parts bin?
>What useful obscure components do you have?

I'm currently looking for general purpose instrumentation amplifiers, memory ICs for a uC, RTC's, a boost converter capable of reaching 200 volts and HV shift registers for a nixie and VFD clock.
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>>1203018

were can u buy resisters
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>>1203020
I order them in bulk from aliexpress.
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>>1203018

I feel like this is too niche and autistic to warrant its own thread.


But, uh, yeah, I needed some buffers for an optical encoder. *A* buffer, rather.

I ended up buying a full reel of 2500 because I have a problem, I think.

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I'll be graduating soon from college with an aeronautical engineering degree. Something I see fairly often on the internet is machinists who have to work with engineers complaining about the engineers not understanding how manufacturing actually works for parts they design. Would it be a good idea for me to take a starter course in machining or something like that? We had a machine shop class in my course but the only actual experience we ever had was stuff like using a lathe once, squaring stock on a mill once (after the instructor put it into the vice for us), using a drill press to drill a few holes, that sort of thing.
I'm hoping to work in design so I'd imagine it might look good on my resume, but I don't know whether it would be a waste of time that might be better spent trying to get a job early on so I don't have a large gap between finishing college and applying for work.
25 posts and 3 images submitted.
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If you're getting job placement before you get your degree, take it. See if they'll let you get some time in the shop (if they have one) or just make a point to hang out with the machinists.

If you don't get placed, take the extra semester/year for the classes while you look for work. Even if you do get placed, they might let you take 6 months to a year to stay in class. It's your money but see if they'll pay for some of it.
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>>1209078
This.

And it's important you know the difference between a screwdriver a bus driver.

The biggest issues with engineers is the design the unmanufacturable, the un maintainable, or they just go too far. A bit of time with tools will ground you effectively and make you a realistic, practical and effective engineer.

Good luck on getting your peng as well.
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>>1209072
Yes, and God bless you.

This is a holy war for me, and I could give you all the reasons why, but I'll just leave you with one thing:

Do realize that your entire design has to be grounded in a real process, and not some magical CAD hand waving. What was trivial for you to imagine will be a suicide mission for a machinist to implement. A lot of older folks that couldn't conveniently make batshit insane designs with CAD in their day and worked in shops before doing engineering work understand this, but the new blood often doesn't. Think about how hard you're boning whoever will have to actually make the part you're designing and save the poor guy any trouble you can.

Hey /diy/ new homeowner here. My father is a general contractor and is telling me to buy Benjamin Moore paint which is like $50+ per gallon. He says crappy paint takes way too many coats and still doesn't look good, and just isn't worth it.

I figure if I'm just doing a single coat to "clean" a paint coverage, like putting fresh ceiling white on an existing white ceiling just to get a clean look, why would I need to blow $60 per gallon?

What is your experience on this? When can I cheap out and buy $20/gallon paint and when is it actually worth it to blow 3 times as much?
150 posts and 26 images submitted.
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Expensive paint will self-level better and not show as many brush marks. I pay more when I have to look at it everday. I think the best compromise are the ones your dad are referring to: Water Based Acrylic Alkyds. I can buy a gallon right now for 35$ a gallon as they're on sale.
Considering better paint performs better and you don't need too much relatively AND you have to look at it every day, why cheap out?
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if you're covering white with white, then yeah a cheap paint will probably work. for painting walls a different colour, get the nice stuff.
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>>1203429
>Expensive paint will self-level better and not show as many brush marks.

Not necessarily.

>>1203430
>if you're covering white with white, then yeah a cheap paint will probably work.

It's amazing how many "whites" cannot cover fucking white paint. Especially ceiling paint.

OP: put the cheapest flat white crap you can buy on a ceiling. Ask the paint store to "put a shot of black" in it, and they will know you are a pro. That makes it the tiniest bit grey, and covers 100x better than regular ceiling white.

Ceilings do not get touched in general. Use flat paint to hide imperfections.

As for walls and trim, there is no such thing as "one coat coverage" if the color is changing by a perceptible degree unless you spray and spray well. Color changes == two coats whether it's $50 per gallon or $10 per gallon.

Buy decent trim paint. Buy just about any wall paint. Buy the cheapest ceiling paint you can find.

Buy good brushes (meaning expensive). Clean them thoroughly and they will last the average homeowner a lifetime.

t. 20 years of this

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>want to replace the two 30 foot oak trees in my yard with smaller 10-15 foot crape myrtles
>get estimates
>$2,000 per tree!!!!!!!!!
>need approval from the town as well

How hard is it to cut down and remove a tree? This is ridiculously expensive and I can get a cheap chainsaw for $150. It can't be that hard, right? Just get a ladder, cut off the top half of the trees, then cut the base, right?
132 posts and 10 images submitted.
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>>1199495
Pretty much, don't forget to drill a large hole in the stump and fill with kerosene, then torch the bastard. Unless you can get your hands on some dynamite.
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>>1199495
How thick are the trees at their base? Does the $2k cover all costs including stump removal, permits, and disposal of any wood you don't want to keep? It all adds up. When we had a dead tree removed we got itemized estimates from 4 different places. Cutting and limbing up the tree was the cheapest part. Then came chipping up the small branches and cleaning everything up. Finally, grinding away the old stump and root system. The last was easily the most expensive bit. BYW, how many quotes did you get? If the answer is "1" then slap yourself and get at least 2 more. 4 more if you can.
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>>1199500
Also, inb4 EPA and Army Corps of Engineers autist shows up to say your committing a war crime.

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