File: ap-1290f1.jpg (35KB, 500x500px) Image search:
[Google]
35KB, 500x500px
hey there, can anyone give me a hand on using sealed lead acid batteries?
ive googled about the topic but most pages go too in depth or are focused on arger more complex batteries/uses that i have intended. im pretty sure someone here can help me easily.
so i bought a couple batteries like pic related to be used on a portable recorder and also in a diy portable amp poyect im building.
main question is: how should i recharge them? i understand smart chargers are the best but they are abit pricey for low budget stuff im trying to do. i have a 12v 7Ah and a 4Ah (but i also have couple of 6v i got from the trash).
anyway, if i connect a dc 12V 1A adapter straight to these batteries... will that do the trick of recharging them? i read somewhere that i should charge them one hour per Ah capacityof the battery. example charge 7 hours my 7Ah bat. is that correct?
how about using a voltimeter to see when they re charged? what voltage should tell me they are charged? also how much is considered "uncharged".. i used one and after going down 10v it came down really fast to 9v and then my unit could not use it anymore.
also, i understand these bats dont have memory.. so i could use them a bit and charge them etc.. is that good? or should be avoided?
thats it, anyway, any pointer or do or dont you guys could give me would be really apreciated. and also sorry for my b ad redaction and english as its not my main language, im trying my best here, sorry! and thanks :)
23 Posts / 6 Images
View this topic
>>
Modern SLAs are really, really robust. If nominal voltage is 12V, they should read 13.5-14V when totally charged. Is your 12V power supply adjustable? Don't try to charge a dead battery with 14V straight off the bat, get the voltage about 5-15% higher, let it equalize, then bump it up another 10% until you've leveled them out at the max voltage. It may take quite a while, depending on the output of the supply and the capacity of the battery. If your supply isn't adjustable throw a 50ohm power resistor in series and call it good.
>>
>>1050018
>also how much is considered "uncharged"
11v
>>
>>1050018
Do not charge them with voltage higher than 14.1vdc.
File: xSAVINGSPACKAGE01C-A.jpg.pagespeed.ic.g9MGUvreiD.jpg (118KB, 800x800px) Image search:
[Google]
118KB, 800x800px
Is there a way I can put a claw tub like pic related on something it can overflow into? What kind of flooring or whatever would I need to put beneath it?
15 Posts / 2 Images
View this topic
>>
>>1049890
Just treat it like a shower. Standard water proof tile flooring with tiled wall, grate in the floor with a shower drain.
>>
>>1049890
you do know that the tub has an overflow drain, right?
>>
>>1049972
That doesn't negate the fact that I want it to be able to overflow without damaging anything.
File: bf46f0e2-2c04-4446-8c06-4f56a4722db2_orig.png (75KB, 1920x1080px) Image search:
[Google]
75KB, 1920x1080px
Do you know the name of the algorithm that can interpret audio?
Or anything that could lead me into this, thanks in advance.
13 Posts / 4 Images
View this topic
>>
>>1049779
A human brain.
>>
>>1049779
>can interpret audio
Siri
>>
>>1049779
Speech recognition consists of whole heaps of common algorithms combined. Bayesian networks, trigram shit, phoneme recognition etc etc. Lots of open source programs for this, most famously Sphinx. Google for the rest.
Music recognition, no clue.
File: IMG_3023.jpg (2MB, 3264x2448px) Image search:
[Google]
2MB, 3264x2448px
What is your opinion of french cleats?
I tore out the pegboard in the garage (which sucks balls - never do this) and replaced it with a heavy duty implementation of French cleats. So for most of this 3-day weekend I've been dreaming up tool racks. Haven't quite figured out how I want it all organized, but that's the nice thing about French cleats. You don't need to know, just start building racks and tool holders and let it all come into place later.
22 Posts / 10 Images
View this topic
>>
File: IMG_3021.jpg (2MB, 3264x2448px) Image search:
[Google]
2MB, 3264x2448px
Screwdriver and misc tool holders.
Basically just pieces of plywood with holes in them.
>>
File: IMG_3022.jpg (2MB, 3264x2448px) Image search:
[Google]
2MB, 3264x2448px
Just a piece of plywood with a bunch of oak dowels inserted at a 75 degree angle.
Can hold various objects like hammers, etc, and things with holes.
>>
File: IMG_3020.jpg (2MB, 3264x2448px) Image search:
[Google]
2MB, 3264x2448px
You can see the vise on the left. I'm not sure if I like this configuration, since the cleat gets in the way. I may take off the opposing french cleat from the vise and drill two large holes in the base instead. I would make a mount by making a board with two protruding bolts or large dowels to hang the vise.
File: maxresdefault (1).jpg (234KB, 1920x1080px) Image search:
[Google]
234KB, 1920x1080px
How do I fix my washing line
24 Posts / 6 Images
View this topic
>>
Just get more string?
>>
>>1049525
Buyfag!!1!
>>
File: tmp_24087-images290223512.jpg (9KB, 239x211px) Image search:
[Google]
9KB, 239x211px
>>1049519
Anonymous
Righty-tighty, lefty-loosey a shit 2016-09-04 23:12:34 Post No.1049282
[Report] Image search: [Google]
Righty-tighty, lefty-loosey a shit 2016-09-04 23:12:34 Post No.1049282
[Report] Image search: [Google]
File: ForwardRearward.jpg (10KB, 250x266px) Image search:
[Google]
10KB, 250x266px
Righty-tighty, lefty-loosey a shit
Anonymous
2016-09-04 23:12:34
Post No. 1049282
[Report]
[View this topic]
Start with the base case. A screw, vertical relative to gravity, face to the ceiling, you standing over it, looking straight down at the head. Even in this most basic case, at all times, and by every measure, half of the screw will always be turning to the right, and half the screw will always be turning to the left. Which means that for Righty-tighty, lefty-loosey to have any meaning at all, you musty first amend it to /The top of the fastener Righty-tighty, bottom of the fastener lefty-loosey/.
Let's see how that fucking chestnut holds up. You are facing the oil pan drain bolt on a 2014 Honda Civic. You are either upside down, or standing and looking up. The bolt is 165 degrees away from its original vertical and you are beneath it. Which is the top of the bolt? You only know because you did it before. There is no top of the bolt because its upside down and backwards.
Lets change the head on a rotating head string trimmer. This bolt is reverse-threaded to work against the torque of the clockwise-rotating head (as seen from above when operating). So the device is upside down, motor on the ground, head in hand, the bolt is reverse threaded, and backwards. Now what is the top of the bolt? YOU DONT FUCKING KNOW. YOU MADE A GUESS AND RFEMEMBERED.
Now you need to change a bent prop on a cherry-kept 1982 Searay Weekender with two rebuilt Ford 302 engines which each turn one 16 inch three-blade brass propeller, counter-synched to prevent pull underway. The bolt on the starboard propeller is reverse threaded - torque - and facing the stern, which means you are facing the bow, while hanging upside down over the transom, using a snorkel because Gus is to cheap to pay the hundo to put the thing on the lift. So the bolt is backwards, you are upside down, and the whole thing is thread reversed. NOW where is the top of bolt?
Righty-tighty, lefty-loosey my hairy white ass.
18 Posts / 2 Images
View this topic
>>
>>1049282
>There is no top of the bolt because its upside down and backwards
>Now what is the top of the bolt?
The head of the bolt is always the top of the bolt you retard
by your logic (since you use boats) "Oh the boat capsized which side is starboard now you dont know hurrrr"
>>
>>1049282
Take your right hand. Make a fist. Stick your thumb out. Stick your thumb on the thing you're putting a wrench on. It's gonna go the way your thumb is pointing if you turn it the way your fingers are pointing.
flip your hand around, and point your thumb away from the bolt. It's gonna go that way if you turn it that way.
This holds true for right handed threads.
Use your left hand for... left handed threads.
>>
>>1049282
Autism
File: build it.jpg (250KB, 1160x749px) Image search:
[Google]
250KB, 1160x749px
I am wanting to make a power supply to use during storms and in case of a black out. I only need it to be able to charge phone battery. I do have a car battery sitting around, I suspect it has a dead cell as it only holds 10.5 volts. Am I correct in thinking that I should be able to plug a car phone charger to the battery and it will just step down the 10.5 volts to 4 volts for the phone charger? So I should be able to use this battery I have laying around.
19 Posts / 3 Images
View this topic
>>
yes to all questions.
better give it a constant trickle charge to make sure it's always topped up. like a 15V 1A transformer in series with a 6V lightbulb.
>>
>>1049058
A phone charger will step down 12v to 5v. If it will still work at 10v is iffy. I'd guess yes but would depend on the charger. Some have low battery shutoff circuits while others are so cheap it is a wonder they don't burn up on first use.
>>
>>1049058
>I only need it to be able to charge phone battery.
You can make a hand-crank emergency generator out of just about anything with a motor that can easily charge a phone. People often recycle old cordless drills for this since it's already geared and a cheap and easy hack.
If you have a car battery that holds a charge, just keep a battery tender on it to keep it constantly trickle-charged and keep a $15 power inverter handy to plug things in. You'll have enough battery capacity to keep a phone charged for months.
File: pic001.jpg (605KB, 2672x1503px) Image search:
[Google]
605KB, 2672x1503px
It's been a long time since we've had a haul thread. I've been too lazy to start one but I have still been collecting. This was from last week. This week there wasn;t any good says because of the weekend.
All these plus 3 good hand saws and a Coleman 242C lantern were all mine for only $50. They came out of an estate for a contractor that retired 30 years ago. Nothing in there was newer than the 1970s and everything had 30 years of dust on it.
Clamps of various make and model. The red ones are Stanley Handymans. The wooden ones are unmarked. The combo square is unmarked. The hatched (for roofing? unsure) is a Plumb. The card file is a Nicholson. The drill index is from National and is full. Inside the bits are rust free.
20 Posts / 13 Images
View this topic
>>
File: pic002.jpg (405KB, 2672x1503px) Image search:
[Google]
405KB, 2672x1503px
>>1048740
The tool box is an older Kennedy and it is mint. Even came with the original inspection cards and advertising inside. Inside its like it was never opened. Outside is a little dusty and dirty but the paint is untouched and its rust free.
>>
File: pic003.jpg (721KB, 2672x1503px) Image search:
[Google]
721KB, 2672x1503px
>>1048740
>>
File: pic004.jpg (423KB, 2672x1503px) Image search:
[Google]
423KB, 2672x1503px
>>1048740
Based on the little wooden insert I think it might be a saw box of some type. I haven't researched it though.
File: news-rigging-3.jpg (142KB, 980x731px) Image search:
[Google]
142KB, 980x731px
Before leaving my parent's house I want to start buying some tools since I use everything from my dad. He has everything from chinkshit to nice american and german made, from stanley to knipex.
Can /diy/ recommend me some quality but not over the top expensive hand tools like pliers and screwdrivers? Very much appreciated.
pic unrelated
31 Posts / 3 Images
View this topic
>>
>>1048719
your dad sounds like a reasonable guy, you should ask him first. I wish i had one to ask...
>>
>>1048719
I bought a craftsman mechanics tool set around 2013. Everything in the box was made in USA. Had any and everything you will ever need in it for about $450.
File: leakingfaucet.jpg (3MB, 2988x5312px) Image search:
[Google]
3MB, 2988x5312px
For the plumbers out there, I'm trying to remove this cartridge but I'm all out of ideas and live 20 minutes away from a hardware store. Anyone have any useful advice? I'm thinking this is a delta shower cartridge.
11 Posts / 1 Images
View this topic
>>
>>
>>1048499
Fuck me m8. Yeah I already removed the collar and such and it was a straight forward pull out. But upon inspection of the cartridge, the metal, plastic, and rubber rings were all still in-tack. I wasted $16 on a seat wrench to find out there's no seat, and water kept draining out of the pipe even though I already shut off my house's main water supply and depressurized the system.
I'm almost certain it has to do with the piping behind the shower controls, that I'd have to cut out the tile and remove it to attend to
>>
>>1048480
sometimes the replacement cartridge comes with a 'wrench' to remove the old cartridge. usually just needs a good jerk to break it loose then it should come out without much trouble.
File: steel-wool.jpg (14KB, 300x213px) Image search:
[Google]
14KB, 300x213px
Is there anything more destructive than steel wool?
53 Posts / 7 Images
View this topic
>>
>>1048113
https://www.americanelements.com/titanium-wool-7440-32-6
>>
>>1048113
Fire. Hydrofluoric acid. My dog. My dog on fire after drinking hydrofluoric acid.
>>
>>1048113
I use 0000 for furniture refinishing.
After I get the stripper off with a plastic scraper I dab the steel wool in fresh stripper and rub the surface.
It takes off anything left and makes it all uniform. The steel wool is fine enough that it doesn't mar the surface and will leave hardwoods extremely smooth.
Love this stuff.
Anonymous
Making a chair for the dentist 2016-09-02 11:27:41 Post No.1047786
[Report] Image search: [Google]
Making a chair for the dentist 2016-09-02 11:27:41 Post No.1047786
[Report] Image search: [Google]
Making a chair for the dentist
Anonymous
2016-09-02 11:27:41
Post No. 1047786
[Report]
[View this topic]
Hello /diy/
I am starting as a dentist and I would like to have a chair for myself (pic related), but original costs too much (for me right now). So I would like to make mine.
First - does anyone have a schematic for this kind of chair?
Second - how would you figure out the "angle" part (pic related)?
I am looking for every opinion.
Thanks in advance
15 Posts / 2 Images
View this topic
>>
>>1047786
Your a fucking dentist, how can you not afford a chair! Also you can afford the the handpeices the autoclaves and all of the other fancy shit. But not a chair,
Fuck you op
>>
>metal under the wood
No. I guarantee that is just bent plywood and foam.
>>
>>1047830
>just starting off
He's got bills to pay off, and unless he's an individual practice, he doesn't actually buy any of his equipment.
File: photo%201[1].jpg (53KB, 625x317px) Image search:
[Google]
![photo%201[1].jpg](https://i.imgur.com/YY2Jvzj.jpg "photo%201[1]")
53KB, 625x317px
How can i make the coolest and clearest spectroscope, i need it to show something like pic related, something bright and creative
15 Posts / 3 Images
View this topic
>>
>>1047528
>coolest and clearest spectroscope
Buy a diffraction grating and…
>diy spectroscope
Break apart a compact disk and…
… take a long tube, glue grating to one end, make a slit on another, profit.
>>
>>1047528
I've been looking into this for about 2 months, OP.
Depends if you just want a toy, or if you actually want a piece of scientific equipment.
If the former, just follow the instructions on the Open Lab DIY spectrometer page using a DVD-R, a webcam, and some razor blades.
If the latter, it gets a lot more complicated. You'd want a linear CCD array rather than a webcam as well as a legit diffraction grating from China.
Some autist made universal software for these as well. https://hackaday.io/project/11264-universal-software-for-diy-spectrometers
Can answer probably literally any questions you have about this; dicking with spectrometers is both my day job and my hobby.
>>
File: Habel_2012_PSP-Practical Spectral Photography.jpg (481KB, 1000x850px) Image search:
[Google]
481KB, 1000x850px
https://www.cg.tuwien.ac.at/research/publications/2012/Habel_2012_PSP/
This might be a fun project for you to do.
File: download.jpg (8KB, 275x183px) Image search:
[Google]
8KB, 275x183px
if i were to buy a cheap welder from Harbor Freight for practicing, would it explode on me or something?
Welders are so expensive and i hear fluxcore is shit.
75 Posts / 12 Images
View this topic
>>
>>1047374
Welder here.
Buy a cheap arc set & cheap rods & fool around with rusty, damp & painted bits of steel.
I gave £40 for my chinese pos. It will lay down a single 3.2 rod reasonably well.
The next rod will trip out the machine for 10 minutes, until it cools down a bit.
Buddha provides, so before you know it you'll have use of a 1930's oil cooled land anchor that will run from January til October without getting past mildly warm. After suffering the utter bullshit that is off-brand welders for a while, you'll become one with the arc & realise 90% of being a 'welder' is muscle memory & common sense.
If you're looking for a Cheap MiG set then it's a real gamble imo. All those wheels, hoses & moving parts can try the patience of a saint when they aint working right. (Most of the time.)
Despite being a Plater Welder in Sheffield, UK for 15 years I've never used FCAW. One only sees it in pressure vessels & off shore work & the like. I usually do a bit of tacking up with low hydrogen rods & back heel it to the Polish lads who sweat for me.
TL;DR
Go for it, but get ready to be on the cusp of rage quit all day long.
>>
Na Op, the harbor freight welders are fine for learning, just note that they all have like a 20% duty cycle
>>
>>1047397
Oh also, go with the 90 amp not the 70 amp arc/stick welder, or maybe even go with the 90 flux welder (though most welders start with stick)
File: bigstock-Rubber-stamp-top-ten-23405258.jpg (212KB, 900x685px) Image search:
[Google]
212KB, 900x685px
I need ideas on how to make my own rubber or wooden stamps easily with little cost. Is there any way I can print my designs on a computer printer and somehow put it on a rubber stamp without actually physically carving it out?
27 Posts / 4 Images
View this topic
>>
>>1046962
Magic.
>>
yes.
My mother makes her own.
>>
I'd make a mini CNC. Wouldn't be hard at all with how little of a space you'd be working with