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Archived threads in /diy/ - Do It yourself - 351. page

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You guys are probably the best suited to answer this stupid but quick question. What is the mechanical/physical property behind this type of grind that makes the tip stronger even if there's less material left?
9 posts and 2 images submitted.
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It doesn't. That's a back-grind, reverse edge, or partial edge, used to increase the blades stabbing ability. Supposedly. Most of the time manufacturers include just to look cool.
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>>1080295
>It doesn't
But every time I see some knife review with that swedge they claim it to make the tip stronger.
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ME here. It doesn't make it stronger. Think about it, taking away material makes something stronger? No. Changing the geometry or material? Yes.

The geometry don't change in a way that makes it any stronger. The material isn't changed. Like >>1080295 said it's probably there to increase cutting area, or to reduce the point area. Either way the effects would probably be minimal with regards to increasing deadliness. It's probably there to look cooler.

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So, here's my problem,
I've been trying to charge a bank of capacitors with no success for the past ten days, and yes, i know that if i dont have the knowledge to charge 200v caps with AC i shouldn't be doing that, but, i know the theory, you have to rectify the signal with 4 hv diodes, or with a rectifier diode, and then use something to limit the current flowing through the circuit so it doesn't blow the fuse.

But even after ripping apart some PSUs to get the power rectifing cicuit and putting my bank just after the last coil thing there is, i just endend up fring the board, and mounting it just on a rectifier diode is just blowing fuse around in my fusebox.
So any help would be apreciated. And also what are the use of those transformer-like coils?

(my knowledge in electronics is around medium/advanced, but i'm no expert, and so is my knowledge in english, so please excuse me for any error in my speaking)

Related pic: rectifier cirtcuit ripped from PSU and niggerigged to a 200v caps, caps is still working, but the board is fried.
10 posts and 5 images submitted.
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>>1080248

I'm not trying to be an asshole here but in my experience, if you don't know what the transformer like coil thing is then you're not advanced in this field.

Look up RCL circuits.
Learn to solve them.
Learn what they are in physical form.
Learn what the associated electrical devices look like.
Learn to figure out the impedance of all RCL components which depend on frequency.
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>>1080248
Wenn du Deutscher bist, stell die Frage nochmal auf Krautchans /t/.

sage because foreign language.
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>>1080267
Thx but i'm french, and there is no real equivalent in my language.

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Anyone any idea how to realise this kind of join?

I saw it in praxis with one side open but i'm wondering if you could have it on both sides closed so it can't slide out. The tricky part is how to get the cutout at the right angle
12 posts and 2 images submitted.
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wat?
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>> 1080222
What is unclear?

Left side is a coutout in the middle, right is just the wood block how it would look from the side.

That spike forces the second piece to go upward before it can slide out and the wood block prevents it from going up. So it holds together tight
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My problem is just that i don't know how to get the spike right. It's easy to get some result but the angle has to be right.

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My apartment have real ugly wallpaper in the living room.
But my landlord refuse to change it and doesn't allow me to change it...

Any ideas on what I can do about it? Can one place temporary wallpaper or something.
I'm starting to go crazy over it... So fucking ugly.

Pic related
13 posts and 2 images submitted.
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Buy a roll of bulk paper and tack it up. You may lose some deposit over the thumbtack holes though and it won't look as good as real wallpaper or paint, but you'll be rid of that terrible flora pattern.
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>>1080223
Bulk paper like the paper you cover packages in? Hmm well that is a solution. Have any experience with tempaper?
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you weren't lying, that's ugly as shit

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How do you make a foundation on a rock for a wood structure?

Bonus points ...howdoyoumakeafoundation IN A TREE??
6 posts and 2 images submitted.
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>>1080045
Insufficient data for a meaningful anwser.
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>>1080046
I tried to make it vague for many open ended options. The meaningful answer would hopefully someone who imagines building a cool camoflaged cottage/shack/outpost on the side of a mountain/cliff where there might not necessarily be any soil. Just rocks jutting out with some trees around to make 2x4s and a few sandbags for fun and a piece of scrap corrigated steel. (Only enough soil for 5-10 sandbags). Think old mines and their scaffolding.
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hang yourself on that rocks hillside

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Hey there I'm looking to get a vintage Russian sovtek small stone but I'm not a big fan of the tone suck or volume drop. How easy is it to switch the footswitch to a true bypass switch?
10 posts and 2 images submitted.
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if you have to ask, it's beyond your abilities.
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>>1080004
I've just heard that the circuit is pretty messy and im not familiar with their circuits.
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>>1079980
install a 3pdt footswitch instead of the normal one. Check google how to wire a 3pdt switch

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I don't know if this is the right place but where can I learn about garden keeping and growing fruit, fruit varieties and such? Any books or things of the type?
6 posts and 1 images submitted.
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>>1079949
There used to be pretty good threads here.
Everyone just goes on >>>/out/ to talk about it now.
Much better suited board
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>>1079949
What he said ^
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>>1080445
Did you just assume my fucking gender? Reeeeeeeeeeeeee

So I'm gunna be dad. (no need to congratulate me)
I thought I'd have a go at making a cot. Design pic related. I've got most of the timber already.
Using mostly recycled hardwoods (Australian).

Basically the design is 4 frames that will screw together so that it can be disassembled, and if this situation arises again in the future we can drag this thing out from under the bed and put it back together.

I was thinking it would be nice to do some interesting joins for the frames themselves, but I never really know which joint to choose for which situation. Does /diy/ have any advice?

Also, thoughts on this design in general? I think it's up to current standards.
11 posts and 2 images submitted.
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>>1079914
>recycled
>current standards
I'd highly suggest looking at other designs and doing some research about the consumer protection laws surrounding cribs

may seem unnecessary, but you want to do everything possible to make sure kiddo will be safe in it

>interesting joins
I don't know about "interesting", but it seems like mortise and tenon joints would be best

they wouldn't exactly be collapsible though
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>>1079924
I'm remilling it myself. I have jointer and a thicknesser. This isn't some pallet wood thing.

There's four sides and a base.
This is two of the sides.
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>>1079927

As far as joints in each individual section I'd think mortise and tenon would be about as far as I would take it. I mean you want to get extra fancy do a pegged version on each corner facing out, sanded flat.

It looks like you might be using dowels on the long sides? I'd reconsider that unless tightly spaced. Kids like to try and get their body parts through there, a square/rectangle is going to be better. I'd visit the local store and check out a manufactured crib to make sure you are getting a close enough spacing just to be sure.
>I mean 1" space on dowels would be fine, but like 4" and the kid will end up with his leg or arm stuck in there like a pinch point.

If I'm building a robot that needs some major power.
Would a hydrogen fuel cell be good?

Specifically I'm looking at combining a 300 watt fuel cell with a 20Ah 48v battery with some capacitors to smooth out any large power usage spikes.
22 posts and 3 images submitted.
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You're going to kill yourself

You have no idea how difficult it is to seal hydrogen

Npt+ptfe don't work

You need an xray perfect weld at all joints and even then the hydrogen will find a way out
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>>1079418
I think he just intends to buy one online, not build it himself. He's using the cell to power something else that he's building himself.
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>>1079393
>> Look up this https://www.google.bg/search?sourceid=chrome-psyapi2&ion=1&espv=2&ie=UTF-8&client=ubuntu&q=why%20hydrogen%20is%20not%20used%20as%20a%20fuel&oq=why%20&aqs=chrome.0.69i59j69i65j69i57j0l3.1204j0j7

Also consider that to extract 100 w of power you need to spend at least 101 w of power (at best, but you will most likely spend 150+) and by the time you use that power the hydrogen will escape the container.

That being fact, you are better off making a huge array of the best batteries you can find, it will be more reliable and cheap at least.

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I want to make a heat-resistant putty. I'm using a thermistor to measure the temperature of a metal block for a laboratory experiment. It's at the bottom of a blind hole about half an inch deep, just wide enough to fit the thermistor, which is the free-hanging type like this one. The block heats up to a maximum of 150 degrees C.
I don't want to use JB weld or similar because we might want to put in a different thermistor, or swap out the block for a different one while keeping the same thermistor.
So I want to make some kind of a play-doh-like putty that I can mix with thermal paste and use to pack the thermistor into the hole, that won't dry out and harden with the heat.
What should I be looking for?
9 posts and 2 images submitted.
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Does it need to be solid at 150C? If not, silicone oil or heat transfer wax would work.
Or if quick response isn't the most important thing ever, you could use spring to press the bead against the metal.
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>>1079372
Quick response is important, and yes, it needs to stay solid. The thermistor goes up into the hole from the bottom and if the putty melts, it'll fall out.
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>>1079376
Filling the cavity with the thermistor with thermal paste using a thermoplast as plug might work.

Hey diy, asked O but didn't get a ton of info. My '10 escape has a piston ring that's going/gone bad. Compression test fails with 111 psi in the bad one and 170ish in the good ones. It's a 2.5 4cyl non hybrid. I would like to fix it instead of getting a new car, but I'm only mildly experienced in diy auto. Has anyone done an engine swap on this body style? Any recommendations for engine suppliers? Anything I should watch out for if I do the swap myself?
29 posts and 3 images submitted.
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It's got 185k miles on it, but it still drives like a champ. Only noticed the misfire at idle, but I regularly drive over 200 miles a day, and can't take the risk of a total breakdown. I'd prefer not to get a newer escape because I think the body style is cheap, and less functional. Not to mention anything with decent milage is pretty expensive still. First major problem with this car, and I love it to death.
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>>1079315
Go to the automotive board lovely
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If it was mine I would just drive it till she blows, then toss in a $200 junk yard motor. Might run another 50,000 miles with low compression.
Do these have head gasket issues?

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Hey guys I built this a month or so ago and took some pictures of it while I was building it, thought you guys might be interested. I'll start with concreting laminated posts into holes around the patio, this sucked.
32 posts and 20 images submitted.
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Posts in place.
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More posts. The ones at the back are bolted into the retaining wall by the way.
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Rafter timbers going up. Screwed together with big dick screw/bolts.

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right motorbike info,, i have a shitty motorbike with a 16inch rear wheel,, the plan is to make it a bit of a classic scrambler for tossing about but still look and ride nice,,i want to put a 18 inch rear on it,,will this affect the gear ratios ?? will it be fine to put on or will i need to do a bit of fettling, wi;; it just be sluggish to start off? lose top end?im so confused,
also general bike queries welcome
8 posts and 1 images submitted.
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>>1078556
>Going from a 16" to 18" rear, same profile tyre.
>Will it affect gear ratios.
Yes, you've increase the size of the wheel by 12.5%, making the gearing taller overall.
>Will it be fine?
Probably, so long as the wheel fits and doesn't rub on anything. I guess make sure the wheel is the same width as the old one.
>Will it be sluggish, lose top end?
Taller gearing means that your theoretical top speed increases. Your 18" wheel has a bigger perimeter to rotate around than the 16" wheel, so for the same RPM the larger wheel will go a further distance. But by the same token, your engine now has a larger lever that it has to push on, so you'll lose acceleration.
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>>1078703
This is why you can swap sprockets.

His info is correct, just adding.
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>>1078705
Forgot about the sprocket. I was thinking along the lines of changing car wheels.

While your putting your larger wheel, increase the size of the rear sprocket as well. That will get your gearing back into factory spec.

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Does anyone know what kind of wood is this? Mohogany? Alder? idk.. pls help
19 posts and 4 images submitted.
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>>1078147
Fender Strats have usually alder or ash bodys, for a crispy sound.
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>>1078147
Not posting the meme version because the book's actually relevant.
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>>1078150
Jesus Fucking Christ
Please, no tone wood shit


>alder or ash bodys, for a crispy sound

Not on a solid body, the species of wood has zero impact on sound in a solid body, never has, never will

Now, if you want to make that argument about hollow body guitars, electric or acoustic, well then I agree it does make a difference, but on a solid body, it doesn't mean shit

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So what tools are you guys hoping to get this Black Friday?

Personally I want to get a miter saw.

Post Black Friday ads and deals here as they start showing up.
28 posts and 1 images submitted.
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I'm hoping to go to home depot and get whatever makita shit they mark down 5% after they marked it up 50% last month

I can't believe these deals!
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>>1077938
>going to stores for IRL black friday

good goy
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>>1077937
Black Friday is a scam. I don't buy any thing

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