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File: image.jpg (22 KB, 696x271) Image search: [iqdb] [SauceNao] [Google]
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Something inside my all-plastic Harbor Freight digital calipers broke and now there's a lot of play between the jaws aka it's useless.

What is the best in-between digital calipers that are better than the chinashit Harbor Freight variety and stupid expensive Mitutoyo/Starrett/etc calipers?? Something very high quality, steel, and guaranteed accurate for $40-60?
22 replies and 4 images submitted. Click here to view.
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>>909263
>guaranteed accurate for $40-60
none

the stainless harbor freight ones are fine for $10. take them apart and wash out all the grit and garbage, lube, reassemble. they only get grossly inaccurate when the batteries are dying. buy a stack of fresh maxells off ebay.
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You can buy a mitutoyo like in your pic used for ~$50.
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>>909284
Pic related. $200 solar calipers not even a year old vs a 10+ year old one I got recently for $50 or something used.

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So DC motors are pretty interesting, and they are indeed inductors. So that must surely mean that if the magnet inside has stopped moving some kind of resistance should be changing, as such does that mean that it's possible to tell if a motor has stalled?

I want to try and set up a smart motor, that will stop pumping current through when current spikes.
17 replies and 4 images submitted. Click here to view.
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Everything you've written is correct, and there have been motor driver ICs that detect stalls like this for the last forty years or so.

Something to keep in mind that current will also spike when the motor is going from stopped to spinning. Your logic needs to ignore current spikes for a short time after switching the motor on.
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>>909235
Sensorless 3-phase BLDC motor controllers use the effect to advance the commutation phase.
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>>909238
thank anon.
could you direct me to a good website that i could read more about this?

File: 555.jpg (1 MB, 3264x2448) Image search: [iqdb] [SauceNao] [Google]
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Hey electrical /diy/er's. I don't post here often, but I've been doing some tinkering, and right now I have a need for a digital oscillator (5V, square/ pulse output), and I want it to sweep its frequency range upon pressing a button.

In other words, what I want to accomplish is this: when I press a button or something, the oscillator will start at a relatively high frequency (sub 60 Hz), and then it will ramp down and after a few seconds it will be at a low frequency (maybe around 0.5 Hz or less, or completely stopped).

Because this VCO will be routed to some standard 7400 series TTL IC's, I would ideally like to modulate only the output frequency, and keep the 5V amplitude constant.

An astable multivibrator seems like a good starting point (maybe I'm wrong, I am only a neophyte). Pic related is a good ol' 555 timer. Currently, the output frequency is easily adjustable with the 20k Ohm pot, and I'm happy with the range of frequencies at the high and low ends.

I'm wondering if maybe I can make some sort of voltage-controlled resistor rig out of a transistor, and then using a cap to control the ramping-down speed. I could then control the output frequency of the oscillator. But I don't know how to go about this.

Very sorry about the long post, but if you can help me accomplish my goal from the second paragraph, then please guide me, sensei.
18 replies and 6 images submitted. Click here to view.
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>>909224
Basically the opposite of a chirp circuit then? It does the opposite of what you're describing.
>>
555 has built in VCO circuits that most people don't notice. Just build the standard astable circuit and connect your control voltage to pin 5.

4046 is another simple option. It's a common chip with a VCO on it. The circuit is as simple s they come.
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>>909226
Not totally sure what you mean by a chirp circuit, I tried to google it but I was just getting 555 "cricket" type buzzers. Which operate at a constant frequency

>>909230
Neat, I'l check out that other IC when I can get my hands on one. In the mean time, I'l try experimenting more with pin 5. In the OP pic, its just coupled to ground with a .1uF cap.

I'm just not sure how to get the sort of control voltage signal I want. I'l...
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My family has an old hp media center PC 864n pic related and I wanted to know if anything was salvageable for a modern gaming PC like case or anything don't want to open it up unless I know that's the only option
28 replies and 3 images submitted. Click here to view.
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>>909089
>don't want to open it up unless I know that's the only option
It doesn't sound like you know what you're doing.
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>>909092
Well I'm trying to start
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>>909095
There's nothing to be salvaged from that POS for a gaming PC, but what's stopping you from taking a screwdriver to that thing and removing 2 or 3 screws to see inside?

File: Toolbox.jpg (153 KB, 380x316) Image search: [iqdb] [SauceNao] [Google]
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I am looking to start a simple tool set for my son. My dad kinda did the same for me and when i moved out he gave it to me. It was great to have.

Just looking for ideas for it. Mostly right now its extras of things i have. I have 2 sets of many things and the things i have 3 of the 3rd item im setting aside for him. Hes young now but when the time comes the "set" will be nice and probably bigger then what i got.
17 replies and 5 images submitted. Click here to view.
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1. electric caulk gun
2. one-way screw bit set
3. dewalt brand 18v blower
4. edgebander
5. electric tin snipper
that should get you started OP
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>>909078
Hammer, sledge hammer, wooden mallet, plastic head mallet, toffee hammer. Basically you can never have enough hammers. And don't forget the wd-40 and duct tape combo.
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>>909078
wooden pallet
shipping container
crab meat (imitation)

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I'm looking to buy a torque wrench to change tires on my car, but it looks like they sell wrenches, adapters, and sockets separately. Anybody have any advice about how to buy all three components such that they're compatible?
35 replies and 3 images submitted. Click here to view.
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>>909039
Im going to be honest, no real need to torque your tires.
Get a 1/2 in breaker bar, and a corresponding 1/2 in socket to fit on the end.
Tighten the lug nuts hard as you can with one hand, do them in a star pattern.

It will be over torqued if you look at specs, but won't hurt it. Remember that the gorillas at the shop use air wrenches to zip the lug nuts on twice as tight as you could ever do it by hand.
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Measure your bolts with calipers if you have them.
Compatible? As long as they are the same Imperial or Metric measurement you'll be fine (1/2 or 3/8 most common).

Your vehicle should have a tire change kit so take the tire wrench to the store to match sizes if you don't have calipers.
Ensure there are no special locking nuts that require a special bit to remove.
Also, If you get a torque wrench ALWAYS RESET IT TO ZERO WHEN PUTTING IT AWAY. It'll fuck up your spring and the calibration.
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>>909046
Oh and once they are changed check the bolts after driving roughly 25km to make sure no vibration loosened them again.

I built a few "growbuckets". They're just buckets full of water, nutrient and air stones in the bottom. The plants were started in a "fogponics" bucket which is working perfectly with perfect white roots, but when I place them in the "deep water culture" bucket the roots rot and the plants die. I think the water doesn't have enough oxygen, so I'm thinking... is it possible to use an air pump to create some kind of water spray in the water buckets? Kinda like an aerosol can. That's one of the options I'm considering. The...
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21 replies and 7 images submitted. Click here to view.
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These plants had perfect roots in the fogponics bucket. A few weeks after I placed them in the deep water culture bucket the roots rotted out and the plant died.
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or you could just use dirt like a normal person.
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>>908917
No

File: hacker-olive-oil-lamp.jpg (72 KB, 640x480) Image search: [iqdb] [SauceNao] [Google]
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Sup, /diy/. I made pic related, it's a jar with olive oil and a standard kerosene lamp wick that's safe to burn inside and is non-flammable by nature of the olive oil.

But I was wondering, I've seen people with Poi that change the color of their flames using chemicals such as strontium salt (for red color), and I was curious as to whether or not you can achieve this with a lamp like this while still maintaining the same level of health safety. I don't want to suffocate myself, obviously, so I would like to know if this is possible for indoor use.

Any...
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27 replies and 1 images submitted. Click here to view.
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>>908809
Yeah, just dissolve the salt of your choice in the olive oil, but you will need to add alcohol to make the salt disolve.
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>>908812
How much alcohol do you think I should use? And should it just be straight rubbing alcohol?
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>>908809
Non-flammable. Bullshit. Knock that shit onto your carpet while its lit and see just how non-flammable it is. The same goes for any liquid fueled flame.

Yes, it has a very high ignition temperature, but its hardly classifiable as "non-flammable"

As to the salts. Why would you want to add anything that will be burned off, sent into the air as soot for you to breathe into your lungs.

I have no idea what say strontium chloride would do during combustion, but do you think anything good could...
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File: furnace.jpg (42 KB, 450x600) Image search: [iqdb] [SauceNao] [Google]
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So I'm visiting my parents for the weekend. They own a vacant house a couple blocks away that I'm trying use as a chill spot for when I can't stand to be around them. Seeing as it's November, it's fucking freezing in there. I turned on the big red switch on the wall (the emergency shut on/off switch for the oil burner) and turned up all the thermostats, but it doesn't seem to be making any difference. I went down into the basement and, as I'm completely unfamiliar with anything appliance-related, I couldn't make sense of the contraption,...
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48 replies and 2 images submitted. Click here to view.
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Why don't you call and ask your dad how to turn the heater on? He might not have bought any gas this year, or have done other winterization things and you could fuck everything up if you don't know what you're doing.
>>
Also, I don't have cell data on my phone, and there's no wifi at the vacant house so I can only monitor this thread from my parent's house. I've got a car though so I can drive over and try out any suggestions you might have fairly quickly.
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>>908574
The entire purpose of using the house is to be somewhere away from them, where they don't know where I am.

File: IMG_5165.jpg (87 KB, 1037x691) Image search: [iqdb] [SauceNao] [Google]
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Howdy /diy/,

Can you tell me what these are and what they're for? Tnx.
21 replies and 5 images submitted. Click here to view.
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File: IMG_5217.jpg (122 KB, 1037x691) Image search: [iqdb] [SauceNao] [Google]
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combination bread-maker/horseshoeing tool.
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>>908547
They look like leather working tools to me.

File: IMG_20151130_210541.jpg (1 MB, 1920x2560) Image search: [iqdb] [SauceNao] [Google]
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Hey guys.

I have a battery pack from an old laptop of mine and I'd like to use them for other purpose (Vaping etc.)
My question is, how can I cut the batterys from the control module without shorting them?
53 replies and 9 images submitted. Click here to view.
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Here are some more pics.
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>>908533

what are you ask? just don't bridge negative and right side of batter while cutting. Better build/buy a dedicated charging circuit like TP4056 and even more importantly a dedicated discharge control because these things are boned when you over discharge them.
>>
File: oops.gif (986 KB, 500x300) Image search: [iqdb] [SauceNao] [Google]
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>inb4 pic related

If you have to ask it is probably a bad idea for you to try.
Enjoy your Allah u Akbar mouth fedora.

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Share your projects here with us!
I just made a lock for my desk drawer. I don't really need it but it pissed me off that it didnt have a lock. I wasn't really sure how to do it but ended up drilling a single hole through both the desk and the drawer where i insert a hex key to stop the drawer from moving, and I mounted some metal brackets on top of it with a padlock. Had to do some filing but it took me about 30 minutes.
Pic related
20 replies and 9 images submitted. Click here to view.
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>>908493
This is what it looks like while opened. Kinda potato quality but you get the idea.
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>>908493
wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwicked
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>>908493
Uhh, anyone with a screwdriver can get in to that, then make it look like it was never opened.
My advice would be to use a rounded head bolt and nut.

Hey there /diy/
I'm almost done with this fucker, but I have no idea how to make the "ears" from two used beer cans. Can anybody help me out on this one?
25 replies and 7 images submitted. Click here to view.
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>>908280
Are you willing to try again? Honestly, that helmet looks like shit. Get a good pep file and apply bondo in thin layers, sand till everything is perfectly smooth and round. Fill little holes with spot putty, bondo, sand repeat till smooth. then sand some more. Then wet sand. Sanding is key. Spend time on this and you'll have a helmet you can be proud of. Not this turd.

Just measure out some distance from the bottom of the can and cut it. Stick the bottom of the can on helmet. You're done.
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>>908292
Sheesh, that one looks top notch. I really should make a new one.
Any tips on visor then? Things might be horribly fucked up with mine.
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>>908298
>I really should make a new one
you really should. I'm making one now. It's not hard. Put a little effort into it and it'll look great.

For the visor, buy a 1mm plastic sheet, heat and bend. I've seen builds where people have used heat guns. Google and try different options. to make the visor black you'll have to use some form of dye. I'm going to use tint film but I don't know how it's gonna turn out. We'll see.

Have you fiberglassed...
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File: lel.jpg (641 KB, 2048x1536) Image search: [iqdb] [SauceNao] [Google]
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I don't really know where to ask this so feel free to point me in the right direction but how do you convert video files onto a tape?
15 replies and 1 images submitted. Click here to view.
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>computer output to VCR input
>play video on computer
>record on VCR
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>>908279
Lol. Usually people are transferring stuff from tape to files.

There are lots of ways of doing this.You will need a VCR of course. Depending on its age it will have various video inputs on the back. I would recommend using composite video.

One option is that you get a VGA to composite converter like this:
http://www.ebay.ca/itm/TV-RCA-Composite-S-Video-AV-In-To-PC-Mac-VGA-Lcd-Out-Converter-Adapter-Box-Black-/281762308111?hash=item419a57a00f:g:FN8AAOSw3ydVu0C~

And then get a 3.5mm jack to Left...
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>>908282
>>908284
Thank you.

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Okay /diy/, I need a big hand here. So I have a vintage lathe, that cannot be found on the internet, no manuals, no nothing.

One of the plain journal bearings on it has some spalling and it locks up the pulley shaft that runs through it. It ran fine with our new belt for about an hour, and now it barely makes it through ten minutes before locking up. We have a constant feed of oil, so it works okay when running, but only barely. It's starting to slow down, and once stopped, is extremely hard to start up. What are we messing up?
11 replies and 1 images submitted. Click here to view.
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a fucked bearing is a fucked bearing, it never gets better. you don't keep running the damn thing, you idiot.
go find a bigger lathe and turn up a new bearing and check your spindle for wear and runout.
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>>908244
Where did you get those dildo foams in the background?
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>>908269
do you mean just bore out the original bearing and press in a new sleeve?

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