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/h/ - Hobby Autism


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About 20 or so VPS providers closed down today. My host is not in the list, but I do not want to give them too much credit.
I have backed up the site. If it goes down, you know why.

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so space is a faggot?

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As preparation for reverse engineering of the AR18, lets break down what goes on during an AR15 cycle of operations.

>1. When the trigger is pulled, the firing pin is impacted against the bullet primer, and the cartridge gunpowder is ignited. Within the first few inches of bullet travel, the entirety of the gunpowder is burned, and peak chamber/barrel pressure is achieved.

>2. As the barrel travels down the barrel, increasing volume causes pressure to drop.
>3. When the bullet passes the gas port, gas flows into the gas tube under gas flow choking conditions (gas port size). The bullet continues to travel down the bore, and chamber/barrel pressure continues to drop.

>4. Pressure at the expansion chamber in the BCG pushes the bolt forward (counteracting some of the rearward chamber pressure) and the carrier backward. As the carrier retracts, the cam path causes the bolt to rotate out of locking position. Friction of the bolt lugs against the locking surfaces may be relevant.

>5. The bullet leaves the barrel and pressure drops rapidly.
>6. The carrier moves back, the bolt is unlocked, the cartridge is extracted and ejected.

All this occurs along with the influence of mass and springs, and not necessarily strictly in all that order. Load data for .223 cartridges is available.


modeling the gas flow has been difficult, mostly because i dont know what assumptions are reasonable to make given the high pressure / high temperature nature of interior ballistics
i had come up with a number of dynamic and fluid flow equations and after reading the US Army Materiel Command's "Gun Series Automatic Weapons" and they were pretty much right on the money
i've found the powder characteristics for WC844 in Army documentation so i can give estimations for orifice flow (through a gas port) and the pressure curve (as the bullet goes down the barrel)


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i'll remake this thread with the VAST breadth of knowledge i learned later


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ok im starting from scratch again this time gonna build it in mathcad, excel just isn't up for this also now im performing my own pressure time simulations using the work layed out in Computational interior ballistics modeling i'll also be doing my own combustion reaction simulations using some NASA software that got illegaly reposted by some pajeets


fuck im stuck with some of these differential equations
they start getting reaaaly complicated

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I found some strange speakers at goodwill today. No markings on the outside or anything. Probably homemade boxes. The "crossover" is just a capacitor. They were only $7 so I thought I'd give them a shot. Surprisingly, they sound really good. They have that vintage new england sound, like older KLHs and Advents. I looked up the model number of the speakers and they're Oxfords from 1969. I don't have any other information, but it seems that these speakers were used more in guitar amps than in stereo speakers.
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like a regular paying job or you're doing a job (like a contract)?


like a regular job. i mostly just do whatever they need me to around the shop. today I built a media server computer thats part of the owners line of really nice streaming servers


nice good job


Okay Musican friend here. Finally got around to poking around at my amp/speaker situation.

I own a Behringer Ultrabass BX3000t and a 4x10 BB410 1200W speaker Cabinet.

>Amp powers on fine.
>Amp receives signal from bass
>amp outputs signal on it's line out/effects outputs
>no loose wires/connections on speaker cabinet
>no noticeable loose connections on amp speaker output

Some asshole at an open mic the amp was "living" at used an instrument cable instead of a speaker cable and has fried either amp or speaker due to the thinness of the cable.

Post too long. Click here to view the full text.


Ended up finding a 250W combo amp for $600. And it only weighs 34lbs!!

Now to wait for warm weather and really start taking apart everything on the broken amp/speaker.

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Waiting period for receiver over. Made fixture, torqueing barrel in morning. Haven't stripped the flats yet, thankfully. Have it 4.5 deg off TDC now. Made fixture with some scrap teak and a rasp.
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lmaooo he's also a fucking sperg. he started pickin shit with me later in the thread. i wasn't being combative even a little but he went full FUCK YOU NIGGER, 0-100.
frankly, as a talented SPORTSCHAN ENGINEER im way fuckin smarter than this dude. gunsmithing talent or not. his job is a fuckin hobby for me 🤷‍♀️


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wew, link to falfiles thread?


give up your animes hobby and dedicate yourself to becoming the next ronnie g. barrett


based zip 22
its not really worth linking, its like arguing with adolph. same retardedness
nevar xDDD


need to solve the occasional failure to extract

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Year 2 Edition
Making progress lately.
Once the ad hoc support /adjustment blocks are up, and I drill out the threads on the X backplate I can start work on the X plate and Z backplate
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fucked up drilling the x plate… drilled oversize, as i've done multiple times since starting this. what the fuck is wrong with me. happen to have quarter inch 1018 round stock lying around. think i'll plug and weld it. idk


oh man forgot about this thread
progress still slow but ongoing
i have a jig for drilling the carriage holes for the y axis plate made, i just need to print it and drill it
my Z axis rails are half done, another hour or two to get the other one ailigned, pecked, drilled and tapped.
then i'll make a jig for the Z axis plate and i can assemble everything up until that point for a good mockup.
in order after that:
- calibrate all axis alignment
- create ballscrew to plate attachment
- install ballscrews
- add motors and motor mounts
- add riser rail bracing
- weld x axis plate gussets
- cast epoxy granite base
- install x axis rails
then everything up until now just slaps on top of my x axis carriages and the real fun (software and electronic setup) begins


ok i WAS going to 3d print a jig, but the rapid prototyping lab is a good ol boys faggot club and they never honored my print request.
gonna take inspiration from the preeminent comic book author of this century, Mr CWC and make one out of CRAYOLA MODEL MAGIC


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Ugly but it works


oh and pics above are the railed up X plate. after i drill the holes from this jig im making from my CRAYOLA MODEL MAGIC, thats the plate thats gonna get it. then i'll do the Z plate after

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Just wanted to post some preliminary progress regarding my AR18 build
i dont have any access to any examples of these because i live in a commie faggot state, but i've started to at least make progress on constructing an upper receiver flat.

im doing this with some knowledge ive deduced and some simplifications as such:
- an AR18 tubular receiver has internal dimensions of 1.25" x 1.25"
- an unbent flat will be approximately 5 inches across
- relative proportions from pictures will be close enough for function

using that i performed progressive rudimentary visual perspective correction for image 1 using GIMP and gridlines to get image 2. i then imported it into autocad and corrected for any rotation. i then visually mapped out the outline to get a general proportions. with this done i scaled the drawing to my 'known' dimension of 5 inches and examined the other dimensions. I then went through them and rounded up or down to units that are convenient to imperial system, and radiused select corners

This would be an iterative process of refining the flat given i dont even have access to an actual rifle. the only dimensions i can think of that will require being really close would be overall length and width. Width i know isn't going to be accurate, given that when bending sheet metal flat dimensions like that wont directly translate to the finished dimensions, but it think its a good starting point. length would be easy enough to change.

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huh fusion 360 actually has interesting features.


getting some inconsistencies regarding looking at the flats. my reference flat is slightly different than everything else ive seen


30 dollars to get it 3d printed
overall dimension not actually that big
a tad over 7 inches long, less than an inch and half wide
might by one of those nodak spud receivers soon and print out a trunnion and receiver to check dimensions


developing some tolerances right now for parts.
need to buy the lower receiver to get a better idea of the upper receiver dimensions


not to get ahead of myself, but im thinking the way the trunnion is set up can be simplified. having it set up to take your standard AR15 barrel would be a plus, except theres not enough room for the index. would have to redesign how the handguards go on to. probly make them split on the other plane for simplicity sake

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I ~~made a gun~~ whittled and try stick.
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is this possible 🤔🤔🤔


It might take a little practice.


very cool, my grandpa used to carve/whittle things. I'll take pictures of the miniature rifles and shotguns he made next time I go to my uncles. He used to always have something he had made in his hands while watching tv or talking to us, "polishing" the wood with his thumb for hours.


thats cool


Pretty cool, i wanted to get into it but went for other hobbies instead.
I still have that fancy knife, tools and tutorial i bought in a woodshop years ago.

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Picked this thing up for 500 burgerbux from some guy. Made no noise at first. Been working on it off and on for the past couple months.


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First thing I did was a general cleanup. The key contact bars were pretty corroded so I hit them with some rubbing alcohol and emery cloth.


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The old power supply was janky as fuck, so I made a new one.


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This board here, the output board, had this giant leaky capacitor on it, which I replaced. There was also a janky voltage divider circuit for generating a 6V "signal ground," so I ripped that out and replaced it with a more modern regulator chip. Once I did all that, and fixed a missing ground, it suddenly started working again.


nice, hobbies r gud

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ITT i manage all my trainees as they ignore me


Probly gonna tweak this more later so you have a more advanced sprint program since you're not coming from complete inactivity, but should work for now as is.


General program guidelines:
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ya ok.


Male sauna here i joined a gym but am afraid to use anything but treadmill there


thats ok ditz you were always meant to be a cardio bunny anyway


have to work on my fucking form for everything. I look like a stupid gay retard. its 5 am


for what lifts?


https://prolikewoah.com/toy/ is the toy bunker for anyone that has toy autism. Just putting it out there.

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Anyone ever consider autism as a hobby?

I mean being autistic takes a lot of time and effort, and most people don't really understand why you do it. Most friends, family, and women think you are crazy for having it, much like many hobbies.


nah, too much work.


Was just telling my mom how I am happiest when left alone to go in deep on shit and not get bothered for repetitive actions. She looked at me oddly. I wish my roomates were more understanding too I often have to withdraw from them to enjoy myself.


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hey guys im new to guns how do I look


lookin good bud!

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Remember Meguca/pol/? The site the German shooter supposedly posted his manifesto on? I found yet another two of their sekrit club bunkers where they're flidding out. They're on BitMessage so you'll need to install that to look at anything.

Go to the Chans tab and click Add Chan, and put in the following information:
Name: Meguca/pol/
Address: BM-2cU9rFxfBHg6cyUZ1UqoTT66iiokazzqJv

Name: megubunker-Ny6w6vEp
Adddress: BM-2cSwRKLFVj7Lgqp7C17z3Av2A8kU7zZCQw


nice fredpost, chump


What are some alternative careers which won't make me kill myself?
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insurance fraudster, just crash some old BMWs and get them sweet hundos from your insurance


duddder out here tryna sell his overstock wrecked bmw's


Look at ways you can make some money on the side and be on the look out for opportunities for a new job. Never quite your old one though without a new job unless the environment is truly toxic.


>deep sea fisherman
tell me more
How do you get in?


just have aspergers and you can preach in front of the UN

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[ 76 / egy / h / kc / librejp / sp ] [ ukko ]