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Motherfucking control knobs by Thomas Baggleworth - Mon, 11 Aug 2014 23:31:52 EST ID:7QLzDrO3 No.6435 Ignore Report Reply Quick Reply
File: 1407814312639.jpg -(57055B / 55.72KB, 1500x1489) Thumbnail displayed, click image for full size. 57055
Why they so expensive?

I was looking for colorful flashy knobs like featured on Build Your Own Clone (who has them for $.60 to $.95 USD each, expensive in quantity..) and thought, man I would love to put some clear knobs on my projects.

Then I looked into acrylic resin and making my own molds and shit. Anyone have experience in this? I basically want to make my own clear acrylic knobs for potentiometers. (but it seems like a useful skill to have for other applications too.)

HOWEVER, I also read about getting some acrylic cylinders like the pic related and hitting them with a "set screw" and putting a piece in there but I could not find anything for my potentiometer to use. They're not the ones with a flat side or even an indention for a flat head screw driver..they're just bald and smooth.

But that's neither here nor there.

> Anyone do acrylics and molding and shit and have any advice on getting started?
It seems like it could be fucking useful for making little acrylic parts here and there.

>Would you advise in support of the acrylic cylinders?
I'm handy with the dremel and have all the bits and pieces to do it if need be. But unlike the molding scenario, I couldn't be able to shave down a cylindrical piece of acrylic and keep it's transparency :[
Comment too long. Click here to view the full text.
1 posts and 1 images omitted. Click Reply to view.
>>
Phyllis Sunderbork - Thu, 14 Aug 2014 00:25:28 EST ID:7QLzDrO3 No.6438 Ignore Report Quick Reply
1407990328976.jpg -(1360004B / 1.30MB, 3096x2322) Thumbnail displayed, click image for full size.
>>6437
I carved one with my dremmel out of wood. Got some tiny wooden sticks from Lowes. Carved a flathead on one end, and a tiny shaft up the other and stuck it through the hole in the acrylic sheet I put over the buck converter. It worked, but was loose. I think I'm just going to keep using a tuning fork though.

With that said, however, you can safely remove component and replace it with a potentiometer of equal resistance. Like so (this is what I made in the pic related):
http://www.instructables.com/id/Easy-variable-voltage-power-supply/
>>
Phyllis Sunderbork - Thu, 14 Aug 2014 00:43:45 EST ID:7QLzDrO3 No.6439 Ignore Report Quick Reply
1407991425976.jpg -(15739B / 15.37KB, 400x299) Thumbnail displayed, click image for full size.
>>6438

I just realized I said tuning fork and I don't remember if that's the official name or just something we called it. It's what we called them in the military when I was a radio tech. We'd call them tuning forks because, quite literally, we tuned frequency filters, amplifiers, and hetrodyning components on radio boards.

Pic related, "tuning screwdriver" also brings pictures of what I'm talking about. Usually the handle is all plastic and only the tiny flathead tip is metal so that you can safely tune components on live boards.

Properfags who only want to do shit properly would tell you to use this on that potentiometer type but a small screwdriver like in a prescription glasses maintenance kit will work fine too.
>>
Ernest Bromblecheck - Sun, 17 Aug 2014 19:53:52 EST ID:HF5RlaE4 No.6447 Ignore Report Quick Reply
I usually just get the best I can find on ebay, those are $14 for a 48x22mm solid aluminium knobs and they look awesome on amps. If you want clear ones it looks like you'll really have to mold them yourself - I could only find one ugly model on ebay but perhaps they're out there somewhere. If you decide to go full DIY, remember that you need some way of fastening the knob to your pot. I recommend making a mold of the size you want and having some kind of insert that will accomodate for the 6mm pot knob as well as the fastening screw. I guess your best bet is to use 6mm thick plastic, threading it with your preferred thread size, turning a screw into that thread and using that together with the mold (you'll need something to center it in the mold). I hope that was clear enough, if not I can invest 9001h in paint and make some drawings for you.
>>6437
http://beezar.com/catalog/product_info.php?cPath=29&products_id=65
a bunch of other places sell the same thing, just google "bourns trimpot tool" and you'll find them. I bet you could find a cheaper offering, but $2.80 is already pretty good. There's a bunch of other kinds but the ones I've seen are just glorified plastic screwdrivers - what you want is a tool that has the blade recessed into the body like the one I linked to so you don't slip off the trimpot while turning. Takes some fiddling to get it into the slot, but once it's in you can safely turn it with no danger of slipping.

>>6437
>>6437
>>6437
>>6437
>>
Betsy Duzzledon - Wed, 20 Aug 2014 07:46:03 EST ID:+nETLFaO No.6450 Ignore Report Quick Reply
>>6447
"bourns trimpot tool"
Thanks ! now i know what to look for
>>
Nicholas Clockleforth - Fri, 22 Aug 2014 20:08:50 EST ID:mhOkUYJD No.6456 Ignore Report Quick Reply
OP, I just googled this to see whether it's a thing, and apparently it is:
http://www.pmma.dk/acryl_polering.aspx?Lang=en-GB
You could use the acrylic cylinders and then polish the surfaces where you cut them to get back the shine and transparency - I guess you'd need to get a pretty straight and neat cut in the first place if you want it to look nice though. You could also use some fine-grit sandpaper first to get it almost perfectly smooth so you don't have to polish too much if your cuts don't leave a nice surface. You're gonna need to wet sand it if you go that route, so make sure to use waterproof sand paper and get a decent variety of grits including some very fine ones - sanding is much easier and faster than polishing, and 5000 grit sandpaper leaves a surface that's almost perfectly smooth to the touch so you'll have it smoothed out nicely with a few runs of polishing.


is this the right board for this by Nell Niggershit - Thu, 21 Aug 2014 21:30:45 EST ID:h4yAb3hN No.6451 Ignore Report Reply Quick Reply
File: 1408671045820.png -(1917164B / 1.83MB, 1920x1080) Thumbnail displayed, click image for full size. 1917164
Genetic engineering or gmos. I'm writing a research paper about why we need gmos. I can't find any evidence that they pose a risk to anything. Lots of studies show they are fine. Who funds the studies though. A lot seem to be from independent scientists but i dunno. Can we discuss this here? or should I take it somewhere else?
>>
Nicholas Dartwill - Fri, 22 Aug 2014 00:29:05 EST ID:R8Jeo5Vp No.6452 Ignore Report Quick Reply
I would take this to the future's /sci/ board. its faster than this board.

Personally I do not have any citable info for you.
>>
Nell Niggershit - Fri, 22 Aug 2014 03:12:11 EST ID:h4yAb3hN No.6453 Ignore Report Quick Reply
>>6452
thanks
>>
Nell Niggershit - Fri, 22 Aug 2014 17:09:25 EST ID:h4yAb3hN No.6454 Ignore Report Quick Reply
i hate 4chin though.
>>
Nigger Bluckleford - Fri, 22 Aug 2014 19:58:05 EST ID:mhOkUYJD No.6455 Ignore Report Quick Reply
>>6454
Honestly it's better than people on here act. For some reason, 420chan seems to have some kind of edgy aversion to the future. There is of course much more shitposting over there, but there are also some very knowledgeable and chill people on some of the boards. /sci/ is a prime example of both - there's about a million IQ threads and tons of "0.999...=1" shit every day, but there are also some math PhD students who really know their shit and a bunch of smart people from other fields. It's all a matter of sifting through the shit I guess, and I can understand if some people can't be bothered.

Either way, if you post a good, well-thought out question on /sci/ that doesn't have a readily google-able answer, you've got a decent chance of getting some good responses (and a 99% chance that there will be some bad shitposting).

On 420chan, I'd say this question would be better suited to /chem/ - "genetic engineering" isn't really what I'd consider actual engineering, it's an application of biochemistry/genetics. /chem/ has the added benefit of being a bit faster than /tesla/, too. I think this is one of the slowest boards on the whole site.


How to lock this? by Henry Blathercocke - Mon, 18 Aug 2014 14:36:46 EST ID:GzT+uX5m No.6448 Ignore Report Reply Quick Reply
File: 1408387006588.png -(686410B / 670.32KB, 656x553) Thumbnail displayed, click image for full size. 686410
I am trying to work out how I can make this briefcase/laptop case lockable. There are two holes that are 1cm in diameter at the top, they are 3.2cm apart and there is a hinge for the second hole as shown in picture. It may not be possible; but I figured I'd see if anybody else's brain could ponder up an idea.

If it's not really possible; any other locking solutions? I don't have access to powertools!

Thanks very much /tesla/.
>>
Nell Honningpudge - Tue, 19 Aug 2014 21:18:22 EST ID:HjAq4KwX No.6449 Ignore Report Quick Reply
Buy a padlock, drill some holes in it and screw in a latch


re: Engineering is super hard work? by Edward Pittlock - Fri, 08 Aug 2014 05:49:54 EST ID:iQlMHuxK No.6430 Ignore Report Reply Quick Reply
File: 1407491394619.jpg -(3048B / 2.98KB, 111x144) Thumbnail displayed, click image for full size. 3048
I've considered becoming an electrical engineer, but my friend seemed to think that I wasn't cut out for something like this. Is engineering in general, super hard work? Are there certain personalities that do well with this than others?

Is there some reason why I couldn't be an engineer?
Is there a clever analogy you can compare being an engineer to?
>>
Barnaby Pebberkire - Fri, 08 Aug 2014 23:49:10 EST ID:01krkNKo No.6431 Ignore Report Quick Reply
I hope you love math.
>>
Oliver Surringnane - Sat, 09 Aug 2014 04:57:33 EST ID:JbW9OILc No.6432 Ignore Report Quick Reply
>>6431
Who could possibly hate math? What else?
>>
Augustus Gemmledock - Mon, 11 Aug 2014 21:23:23 EST ID:nRiN09B6 No.6434 Ignore Report Quick Reply
Did you do well in high school, particularly math and science? I don't care how smart you think you are just if you did all your homework and got good grades.

Are you good with working with your hands?

Are you OK with spending a lot of time studying?

Are you OK with classes with terrible male:female ratios?

If you answered yes to all of those, then do it.

>>6432
>Who could possibly hate math?
Most human beings. Seriously though I have a good friend who often says how he loves science and sometimes math. In reality he just knows neat physics concepts but can't explain or prove anything. If he really enjoyed science he'd pick up a textbook and learn something, but he doesn't. He just likes feeling like he's smarter than people he isn't.
>>
Cedric Sondleham - Thu, 14 Aug 2014 14:46:19 EST ID:EyqApq5P No.6441 Ignore Report Quick Reply
>>6430
>Is engineering in general, super hard work?
one of the most difficult faculties
>Are there certain personalities that do well with this than others?
people who like maths and can study a lot of hours with no problem and already know how to do so since high school.
>Is there some reason why I couldn't be an engineer?
if you study and yet don't get good results in the hard subjects in high school, then it's going to be difficult.
If you haven't tried applying yourself strongly in high school already, you have a motivational problem already.
>Is there a clever analogy you can compare being an engineer to?
engineering is suffering under the whip and asking for more because you want it.


broken egg by John Pungerstat - Tue, 12 Aug 2014 07:02:10 EST ID:gIZNaa5b No.6436 Ignore Report Reply Quick Reply
File: 1407841330235.jpg -(82730B / 80.79KB, 1000x1000) Thumbnail displayed, click image for full size. 82730
i posted this somewhere else a moment ago but figured here might be better. i got a vibrating fleshlight in the mail and took both ends off with haste. what i didnt realize is that the egg is attatched to the ventilation cap, and i ended up detatching the wires from the top. im also completely ignorant when it comes to wiring. is there a simple way i can fix this?
>>
Basil Desslelodging - Thu, 14 Aug 2014 14:39:24 EST ID:zCR9OQf3 No.6440 Ignore Report Quick Reply
>>6436
i don't know dick either, but i would guess either try soldering it and/or using electrical tape where needed, you could also add more wire to connect to whatever was disconnected.. i would think the added length would make it a bit easier to get in there
>>
Walter Blackwill - Sat, 23 Aug 2014 09:26:22 EST ID:P1FecDgQ No.6457 Ignore Report Quick Reply
1408800382263.gif -(2767606B / 2.64MB, 264x240) Thumbnail displayed, click image for full size.
>>6440

>i would think the added length would make it a bit easier to get in there


magnet motors by Ian Siddlechan - Tue, 17 Jun 2014 17:16:38 EST ID:oAxeGcm1 No.6364 Ignore Report Reply Quick Reply
File: 1403039798159.png -(28932B / 28.25KB, 300x171) Thumbnail displayed, click image for full size. 28932
Why don't magnet motors work

I have no idea about the physics and science behind it but i'm curious.

I'm just trying too learn something, please don't be mean too drunk little me
1 posts omitted. Click Reply to view.
>>
Polly Chasslehall - Thu, 19 Jun 2014 01:58:51 EST ID:01krkNKo No.6366 Ignore Report Quick Reply
Some of them do work, but it demagnetizes the magnets, so they don't work forever.
>>
Nigger Gollyhall - Sun, 20 Jul 2014 12:37:07 EST ID:5gD9lQi4 No.6412 Ignore Report Quick Reply
>>6364
http://www.youtube.com/watch?v=RkLfpXpO5sQ

This seemed an appropriate time to share this
>>
Reuben Poshshit - Sun, 20 Jul 2014 13:53:15 EST ID:FyDQ8lW0 No.6413 Ignore Report Quick Reply
{lime}
>>
Ebenezer Dettingford - Mon, 21 Jul 2014 00:09:13 EST ID:XObDUDiZ No.6414 Ignore Report Quick Reply
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My understanding of motors is they are based on an oscillating current. There are 3 plates connected to 3 coils on the inside and 2 brushes on the outside. When it spins the brushes always touch 2 of 3 plates and the 2 it touches keeps changing. That creates a current that oscillates back and forth in polarity, which in-turn will oscillate the magnetic field in the 3 copper coils. That creates a balance of attraction and repulsion against the 2 magnets on the outside so it works. Magnet motors have no current and therefore lack that oscillation, which is essential to keep it spinning indefinitely.
>>
Archie Gackleforth - Mon, 28 Jul 2014 21:40:49 EST ID:J0zfKXTE No.6422 Ignore Report Quick Reply
What? I work with permanent magnet motors.


circtuit problems by Charles Sattingfene - Mon, 14 Jul 2014 01:34:00 EST ID:XObDUDiZ No.6399 Ignore Report Reply Quick Reply
File: 1405316040975.png -(12374B / 12.08KB, 687x361) Thumbnail displayed, click image for full size. 12374
I posted here a couple of months ago that I was creating an automated sprinkler system, but I'll keep this brief. I'm running a DC solanoid valve and a relay switch using an Arduino from my computer. The Ardiono cannot power either device directly so it switches the device indirectly via a NPN transistor. The 9V batteries can power both devices sufficiently. The diode is a to neutralize any kickback in the coils (both the valve and the relay have coils so I'm using the same circuit design for both of them). I had the relay and valve turning on and off every 5 seconds to test them but then they stop doing this after a minute. I replaced the diode and that solved the problem for about a minute but then it stops working again (I think current is building up and gettting trapped somewhere but I don't want to remove the diodes). Is there any electronics whizz who can help me solve this riddle and stop the electical buildup or whatever it is causeing this?

I got the schematics from here using their design but I think there is something wrong and I can't figure it out . http://www.instructables.com/id/Controlling-solenoids-with-arduino/

Here are the design schematics im
>>
Jarvis Trotridge - Thu, 17 Jul 2014 08:13:15 EST ID:gKi6WIvM No.6401 Ignore Report Quick Reply
>>6399

Okay not really an electrician but by the sounds of it you're destroying the diode.

Is the diode in reverse or forward bias?
Is there anyway to lower the voltage?
Have you tried using Zener diode instead?
>>
Ebenezer Dettingford - Mon, 21 Jul 2014 00:27:35 EST ID:XObDUDiZ No.6415 Ignore Report Quick Reply
>>6403
Oh can you tell me how to put a capacitor in my circuit? I think this harmonizing is exactly what is happening but I don't know enough about electronics to know how to cancel something out or integrate a pendulum into my circuit.


Electromagnetics by Rodrick Hughes - Sat, 19 Jul 2014 17:30:54 EST ID:ppVBLVzM No.6410 Ignore Report Reply Quick Reply
File: 6.jpg -(80085B / 78.21KB, 666x69) Thumbnail displayed, click image for full size. 80085
if emf=Work/charge and voltage=change in potential energy/charge and Work= -Change in Potential energy then does emf=-V

Sorry if this is a dumb question. My professor was using emf and voltage interchangeably but the definitions are emf=W/q and V=delta U/q so...


Pic unrelated
>>
Rodrick Hughes - Sat, 19 Jul 2014 17:33:02 EST ID:ppVBLVzM No.6411 Ignore Report Quick Reply
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Fuck, just saw that this particular board is "work-safe" immediately after posting. Sorry guise....Plz don't n00b-hax-slash-ban me, IT WONT HAPPEN AGAIN! I PROMISE


Cool Tools by Whitey Clundlefed - Fri, 18 Jul 2014 22:32:05 EST ID:jvdtbojL No.6405 Ignore Report Reply Quick Reply
File: 1405737125615.jpg -(329647B / 321.92KB, 1600x1200) Thumbnail displayed, click image for full size. 329647
So I was at work today and I found this weird, for lack of a better term, multi-wrench. Sorry the picture is shit, I was in a hurry. I have a picture of the box which I'll post as well. Google has done me no favors in finding places where I can buy this kind of thing.
>>
Whitey Clundlefed - Fri, 18 Jul 2014 22:33:56 EST ID:jvdtbojL No.6406 Ignore Report Quick Reply
1405737236615.jpg -(183521B / 179.22KB, 1600x1200) Thumbnail displayed, click image for full size.
>>6405
>>
Whitey Clundlefed - Fri, 18 Jul 2014 22:36:00 EST ID:jvdtbojL No.6407 Ignore Report Quick Reply
1405737360615.jpg -(446973B / 436.50KB, 1600x1200) Thumbnail displayed, click image for full size.
>>6405
I managed to buy another multi-tool, just to give some context on the kind of goofy yet useful stuff I'm looking for


Future Innovashuns by Polly Murdstone - Fri, 28 Feb 2014 16:43:10 EST ID:sKoRRU+w No.6166 Ignore Report Reply Quick Reply
File: 1393623790734.png -(663525B / 647.97KB, 1800x3100) Thumbnail displayed, click image for full size. 663525
What are some interesting technological developments to arrive in the near future?
Also let's consider the implication thereof
I'm bittersweet about driverless cars, I recognize the value, but that's how many jobs gone?
5 posts and 3 images omitted. Click Reply to view.
>>
Phoebe Niggleson - Thu, 13 Mar 2014 05:32:44 EST ID:XObDUDiZ No.6211 Ignore Report Quick Reply
>>6206
what is the benefit of having a tokamak?
>>
Sophie Caddlecocke - Thu, 13 Mar 2014 06:58:24 EST ID:SlDB4r2O No.6212 Ignore Report Quick Reply
>>6211

Well, to keep it brief, they can be fueled by isotopes that are ready available, nearly inexhaustible, safe to use, and easy to obtain. They do not create emissions such as coal/oil/natural gas plants, they can potentially create much, much more energy than our current fossil fuel power plants, are much safer than nuclear power plants (for example if something goes wrong with a tokamak, the building might explode, but you wont have to evacuate cities) and Tokamaks can be made so that the waste product they produce has zero radioactivity.

Unlike nuclear power plants today which use Fission, which creates tons of radioactive waste, and if a meltdown or another Chernobyl/Fukushima event happens. Tokamaks use Fusion instead. If a Tokamak was hit like Fukushima or Chernobyl was, there would of course be damages (venting superheated, compressed plasma will do that) but you would not have an ecological disaster.
>>
Sophie Caddlecocke - Thu, 13 Mar 2014 07:04:04 EST ID:SlDB4r2O No.6213 Ignore Report Quick Reply
1394708644927.png -(1425387B / 1.36MB, 1502x751) Thumbnail displayed, click image for full size.
>>6212

Totally forgot the image. Also forgot to say that some of the isotoped used to fuel a Tokamak can be harvested without damaging the environment. Here you can see one of them powering up.
>>
Oliver Billingridge - Tue, 03 Jun 2014 11:32:10 EST ID:ON3r94Xq No.6339 Ignore Report Quick Reply
the maturing of wakefield-accelerators
these are the next generation of ultra-high energy particle accelerators. pretty neat and the principle behind it is very slick. one interesting aspect considering the possible uses is the size of these accelerators - with laser technology advancing and bringing forth table-top-terawatt lasers (and possibly soon even table-top-petawatt lasers) a full scale multi-GeV electron accelerator could fit inside a small laboratory instead of an underground complex spanning more space than a whole village.
>>
Phoebe Hundleshit - Sun, 06 Jul 2014 12:03:13 EST ID:zSk0lVcV No.6393 Ignore Report Quick Reply
>>6166
But how many fewer deaths? I'm not that old, yet I've already had 5 friends die in car accidents. Also, this is a pretty interesting topic. I had a principal in high school who was friends with one of the developers of those flat-panel TVs thin enough to hang on your wall. They had supposedly started working on that in the 60s with the goal of creating a TV thin and light enough to hang on your wall like a portrait. I can't even begin to imagine the amount of tech that various governments have under wraps.


engineering past 20? by Angus Hennerfit - Wed, 07 May 2014 16:45:31 EST ID:RFYmpDbI No.6293 Ignore Report Reply Quick Reply
File: 1399495531976.jpg -(39969B / 39.03KB, 485x323) Thumbnail displayed, click image for full size. 39969
How old is too old /tesla/ ?

At what point am I too old to become an engineer?
5 posts and 2 images omitted. Click Reply to view.
>>
Sidney Shittingdock - Sun, 18 May 2014 20:40:14 EST ID:cB3JxN8o No.6319 Ignore Report Quick Reply
>>6293
I went to school with someone in their 40's in Mechanical Engineering. They learned incredibility fast and understood how physics functions in my Dynamics course. I say they were better student than majority of people in the major including younger ones

I've seen many older people in College succeeded over younger students. I think you just need to put effort into what are you learning.


just believe it and blaze it faggot
>>
Simon Wommerwan - Mon, 02 Jun 2014 10:51:53 EST ID:QGLqmiTA No.6335 Ignore Report Quick Reply
>>6319
Young people have higher brain plasticity BUT

Older people are more used to work and responsibility, and usually take studying a lot more seriously.

So eh.
>>
Hugh Fenninglock - Tue, 03 Jun 2014 05:17:43 EST ID:WCjzl674 No.6337 Ignore Report Quick Reply
you can join the army and join the corps of engineers untill around age 30
>>
Samuel Lightwill - Fri, 13 Jun 2014 16:11:13 EST ID:cEF2IEg5 No.6361 Ignore Report Quick Reply
dude/maam,
don't compare yourself to other people because what matters the most to yourself should be you. do you like it? do you really like it? do it. i think you rather should ask yourself if you are competent enough to be an engineer.
as a freshman in ME, all of the older students seem to have gotten past the whole highschool-mentality point in their lives. being the youngest in the class has made me value older people for their experience.

be swift, try to remember the code/formulas as best you can by practicing,
& yenno, don't blaze it everyday (weekday) because staring into the fucking abyss while looking at equations you can't understand isn't fun
>>
Phoebe Hundleshit - Sun, 06 Jul 2014 11:57:42 EST ID:zSk0lVcV No.6390 Ignore Report Quick Reply
>>6293
I have a friend that's in his 30s who decided to go PE after he decided he hated his original profession. He always gets top grades. Sometimes they'll hire older candidates just because they're typically more responsible. You're only too old if you have alzheimers imo.


Good videos by Charles Chebblebury - Sun, 22 Jun 2014 19:10:43 EST ID:1GHqB3hY No.6375 Ignore Report Reply Quick Reply
File: 1403478643101.jpg -(100629B / 98.27KB, 1024x686) Thumbnail displayed, click image for full size. 100629
I just found this youtube channel that's a bunch of short expositions on engineering. They're pretty good. https://www.youtube.com/user/engineerguyvideo/videos?shelf_id=1&sort=dd&view=0
>>
Hamilton Peblingman - Mon, 23 Jun 2014 13:54:59 EST ID:5gD9lQi4 No.6376 Ignore Report Quick Reply
>>6375
I just got back from taking a tour of U of I. Godamn, it's flat out there...
Great campus though.
>>
Ernest Soddlechun - Sun, 29 Jun 2014 20:31:55 EST ID:CKZoWqYh No.6384 Ignore Report Quick Reply
https://www.youtube.com/user/EEVblog
EEVBlog is great for electronics videos and some misc crap too


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