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/h/ - Hobby Autism

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File: 1573956382225-0.jpg (394.65 KB, 1200x800, 3:2, DSC_2474s.jpg)

File: 1573956382225-1.jpg (843.88 KB, 1200x800, 3:2, DSC_2474sPERSPECTIVE.jpg)

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File: 1573956382225-3.png (129.48 KB, 1131x622, 1131:622, AR18 Flat V1.PNG)

 No.214[Last 50 Posts]

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.

Thoughts?

 No.215

>>214
shouldn't you be able to find detailed and exact measurements of all the receiver components online? I would think that this "approximation then refine" strategy would be a huge disaster and time suck

 No.216

would anything in ar180s.com be helpful? eg:
ar180s.com/project-sa80-l85a2-freecad-fusion-360-parametric-design/
ar180s.com/more-ar-180-upper-news/

 No.217

>>216
>would anything in ar180s.com be helpful? eg:
extremely helpful. im already in correspondence with Rick Kelley (the site owner) by email
>>215
>I would think that this "approximation then refine" strategy would be a huge disaster and time suck
why?
a time suck sure, but not that much of a time suck. I wouldn't build a whole rifle on my first receiver, presumably i'd be able to refine it before then
certainly not a huge disaster. its how many obscure homebuilt rifles are made, and when things are hand fit nothing really matters that much anyway because you're fitting on the fly

 No.218

>>215
>>215
>would be a huge disaster and time suck
this nigga built a watch
a watch

 No.224

File: 1574062572537-0.png (34.72 KB, 664x466, 332:233, Snipped.PNG)

File: 1574062572537-1.png (498.35 KB, 1175x492, 1175:492, snipped2.PNG)

huh fusion 360 actually has interesting features.

 No.225

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

 No.226

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

 No.238

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

 No.239

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

 No.461

i must have been posting all my updates in spee because none of it is here
just spend the night having serious autism and designing what im hoping will be my bending jig
i got inspired and doin my own design. will see if thats a mistake or not

 No.463

>>461
mmkay keep us updated OP

 No.464

>>463
ive got most of it modelled out, pretty fun to look at.

 No.494

just list everything ive done since 2019:
>switched to solidworks, remodeled everything
>multiple 3d printed iterations of receiver and trunnion to narrow down the placement
>MJF printed buttstock, buttpad, prototyped a rear sling swivel to stop stock rotation
>95% modeled handguards, heat shield, front sight block, handguard retaining ring
>picked up an AR18 front sight
>found out the AR18 gas block diameter is way smaller than an ar180
>need to either reprofile the barrel (its an insane heavy bull barrel) or get a new one
>getting new one would be the simpler and possibly cheaper option
>also wouldn't have to headpace it which would make life easier
>guess i could sell the ar180 barrel?

 No.495

sorry i mean ar180b not ar180

 No.573

File: 1635645682946-0.jpg (944.03 KB, 2560x1920, 4:3, IMG_20211029_215058141.jpg)

File: 1635645682946-1.jpg (1.04 MB, 2560x1920, 4:3, IMG_20211030_184522135.jpg)

So a lot going on here, I decided to go with a rubber forming jig, made one out of some 1-1/2"x6" 90a polyurethane that I modified, 2x3x1/4 angle (free), and 1/4" plate I had. My layup was perfect, my welding is dogshit (I'm not a welder for a reason).
Other pic is my test bend piece, just a small section of the receiver material, showing that it works.
My plan is to use a finger break for the small flanges of the receiver, and rubber forming for the larger sides.
I also did a small test piece to measure the k factor and make adjustments.
Its is also just big enough for me to use for my mp5 flat as well. Thankful, because I forgot to measure

 No.575

File: 1635985023052-0.jpg (102.58 KB, 792x1024, 99:128, Experimental Determination….jpg)

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oh i worked on things a bit over the weekend and monday
basically modified the rest of the rubber pads over the weekend (hung out with my friend and he helped), did 6 legit bends to do a proper k factor measurement, then wrote a technical memorandum on it for documentation.
i also did a wide bend to see if i could do the small flange on it also, and confirmed i can. would like to do a wider one with small edge to triply confirm, but haven't had chance yet
paper attached, give it a read if you're interested. i'd like to add some more illustrations to it to get some of the points across better, but its pretty much done
pictures attached because i can't attach PDF

 No.576

might makes some changes to the paper. not liking how i describe the setup, not clear

 No.577

>>575
IATA

 No.582

File: 1636084830740-0.png (533.06 KB, 2550x3300, 17:22, ClipboardImage.png)

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Paper revised.. improved writeup, added pictures and diagrams, fixed some pretty major calculation errors and validated the results. this is the final paper compared to the other which was a bit of a rough draft also pictures of the bent specimens!

 No.583

>>582
Looks cool. You making a book for it?

 No.584

>>583
no its just an internal paper to document how i arrived at the K-factor. its very useful for me to use as a reference for anything related i eal with in the future
i would like to write a book or manual or something along lines of 'a case study in homemade firearm manufacture'– they could go in there i suppose

 No.586

made the proper punches today, need some adjustment. one of them needs significant adjustment (i completely messed up the size on accident)

 No.587

>>586
mess them up on purpose next time

 No.594

>>587
but that would be a complete waste ;_;

 No.595

>>594
y though?

 No.611

File: 1638674944602.jpg (1.08 MB, 2560x1920, 4:3, IMG_20211124_195643066.jpg)

So taught myself how to use a Bridgeport and been practicing some milling
I got a test flat made, drilled holes for most the radiuses, used a stencil and painted complicated bits to cut out with an angle grinder. Scribed it all using the mill. Turned out great, but bending failed where the flange lengths were short (an unfortunate expectation). Those features will have to be cut after their bends.
Also experimenting with rib forming. A small proof of concept rib form posted last, when I make the real jig for it I'll post it

 No.612

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 No.613

File: 1638675033661.jpg (1.02 MB, 1920x2560, 3:4, IMG_20211204_175122704.jpg)

Proof of concept rib forming

 No.614

>>611
>>613
cool
>taught myself
iata but this seems like the kinda shit that would be way beneficial to have an experienced bloke (muscledaddy) show ya the ropes, for sake of time, wasted materials and keeping your fingers? like apprenticeships r gud n stuff
does this makerspace where you have access to this stuff make you sign waivers before turning you loose?

 No.615

>>614
im smart enough not to kill myself or destroy equipment
but ya it is pretty dangerous theres zero supervision or training and the only thing they have you do is sign a piece of paper saying you wont use stuff without training and sue if you get hurt
a skilled machinist is pretty cool/admiral, but tbqphwyf being an acceptable 'ok' machnist is pretty easy. the ones i work around are fucking retarded.

 No.616

what are you gonna do for the ramrod

 No.617

>>616
the oprod? i nabbed one along with piston/cylinder a while back
i could pretty easily make an op-rod tho. piston and cylinder would be a lot harder and id have to use a lathe

 No.618

>>613
looks great. how much time in are you now?

 No.619

>>618
its taken forever. the design side took a long time to kick off just because i didn't have necessary parts to reference.
all time total? probly few hundred hours?
now that i have the experience id do it a lot different
i'll try and get a successful flat bend for you by next weekend, then if all is well its onto the cam pin rail and trunnion

 No.620

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dump of the stock and grip i designed
thinking bout making a set of hanguards too even though i have a pair.. would be cool

 No.621

File: 1638731451053.jpg (1.47 MB, 3264x1840, 204:115, 1619667230681-2.jpg)


 No.622

i used to fabricate my own parts then i took an arrow to the knee

 No.623

>>617
ramrod actually

 No.625

>>623
what ramrod??

 No.627

>>625
rod that you ram into your gun

 No.645

>>619
as an update that flat bend wasn't successful, but it was relatively close
the problem is my rubber forming technique iw as using didn't work well when scaled up to 8" of length
it did the long flange no sweat, but failed on the short one
decided i'd change my bending jig to be a vice, can bend into it to get most of the angle with a thinner rubber sheet, then shut the vice to get overbend/complete the bend
been spending the past month and half making the vice, is almost done. just some finishing stuff and the jaws are left. hopefully it works

 No.646

>>627
rod that i ram into ur mom

 No.647

File: 1641687597556.jpg (1.29 MB, 2560x1920, 4:3, IMG_20220108_161048936.jpg)

Finished with the vise, this things a behemoth. 12 long 9 wide. Just need to make the jaws and hopefully the jaws don't slip during pressing

 No.652

Wait how did you get autocad at home?

 No.653

>>652
just download a student version for free if you have a .edu email
or download a cracked version
or dont. i dont use autocad anymore i use solidworks because thats what i use at work
for free stuff just use fusion360 (not a fan but it has good features, trying to suck you into their product sphere) or one of the FOSS ones

 No.654

>>652
Blender is gud too

 No.655

>>654
gender…blender?

 No.656

>>655
no for froot smoothie and shorkcel's choco pb protein shakes

 No.657

>>653
There's no student version of SOLIDWORKS?

 No.658

>>657
yes there is fucktard you can buy a student license for 20 bucks

 No.659

File: 1642309763509.jpg (1.22 MB, 2560x1920, 4:3, IMG_20220113_172221552.jpg)

So here it is completed with the jaws and ball bearing at tip of fastener
Did some test crushing rubber, do t think it will slip during bending

 No.662

>>659
You make that metal yourself or did you buy it from a store?

 No.665

>>659
did you complete the jaws yet and do you think it will slip during bending

 No.670

>>665
yes and not sure yet
my next step was to make something for alignment of hte punch (make sure the punch doesn't flip to once side or other during bend)
so i bought some 15 series aluminum extrusion. will allow me to make a supporting frame under it, and also mount some studs that i can slide to a desired position and use as a guide pin. the stud can also be removed and a bolt put in place through the punch to hold the flat down as the jaws are getting tightened.
also i cant find my crescent wrench.

 No.671

File: 1644382944745.jpg (438.58 KB, 1920x2560, 3:4, 1631594476741.jpg)

omg you're still playing with your toys? ugh come back to bed babe

 No.672

>>671
shutup and make me some more cookies

 No.673

the aluminum extrusion came in, i put it all together its not bad. clunky and not refined but i think it will work
have to go tomorrow and modify (extend the length) of my punches to sync up with the guide rods now

 No.674

whyd you make this thread in 2019

 No.681

>>674
its taken forever.
makin the 2nd version of my rib forming die now, probly be done with it on…. this weekend??

 No.683

>>681
>its taken forever.

ask for help and stop doing everything by yourself

 No.684

>>683
>ask for help
it kinda defeats the purpose of why i do this stuff tho, which is mostly self improvement
theres also the problem of legal quandries particular to my state. my long term goal for this is to have a complete technical package that i can release onto the internet ala the 3d printed firearm scene
think fully toleranced drawings for the upper, lower, and jigs needed for manufacture

 No.686

>>684
you're just too arrogant to ask for help

 No.687

>>686
no you

 No.690

>>684
>it kinda defeats the purpose of why i do this stuff tho, which is mostly self improvement

u get better when you learn with other people budy

 No.691

>>690
drop it. now.

 No.692

I can build my own gun. I don't need any help. Leave it alone

 No.699

>>690
its not a hobby that would be smart to do with others, i have a single trustworthy friend who is also an engineer with an interest in firearms and we typically discuss stuff every other day, but its the kinda thing that will become legitimately dangerous to start involving random people IRL

 No.702

>>699
you just dont value friendship enough

 No.704

>>702
im going to finish machining my rib forming die version 2 tomorrow, if im done early enough i'll post pictures of all the stuff i have backlogged

 No.705

>>704
when do you plan on finishing machining your rib forming die version 2

 No.706

>>705
tomorrow

 No.707

>>706
all right and what happens if you're done early

 No.711

>>707
i'll post pictures of all the stuff i have backlogged

 No.714

>>705
>>707
ok it didn't happen today because the gf wanted to make a pie so i had to stay home and do that instead. maybe i can do it tomorrow? idk this fucks my schedule up ngl

 No.715

>>714
so why did you stay at home dealing with some bitch instead of working on your project

 No.718

>>715
because
wtf retard, ask me if it happened so i can respond "ok it didn't happpen today" then you can ask why, then you can ask when i might do it next, then you can ask if it messes with my schedule
ugh way to fucking ruin everything

 No.722

>>718
what kind of pie was it

 No.723

>>722
we made a pie with pizza filling
so i guess basically deep dish with a crust?
red sauce, pepperoni, italian sausage, green bell pepper, lots of motz

 No.724

>>723
did you save me a piece? haha

 No.725

>>724
all gone.
finished the rib forming die yesterday, if im not lazy i'll post picture

 No.730

File: 1647672586717-0.jpg (1.25 MB, 1920x2560, 3:4, IMG_20211211_182201578.jpg)

File: 1647672586717-1.jpg (951.91 KB, 2560x1920, 4:3, IMG_20211211_182207163.jpg)

Ok so updating the thread.
So before I made the new bending jig/vise, I had done a semi-successful rib forming and bend.
The rib forming tool was just a pice of wire on a plate, with an accompanying cutout. It didn't work well, at least partially because the pressure required is way too high to do both ribs at once, but also because of material strength issues and alignment problems.
Because of those, during the bend there was some tearing problems
The bends on the old bending jig weren't great either. Pressure required exceeded what what the press could provide, and the bends could only be completed 80ish percent. The remaining amount I cludged out by squeezing it in a vise. The results were not satisfactory, but the best so far

 No.731

File: 1647673061626-0.jpg (1.09 MB, 1920x2560, 3:4, IMG_20220318_212648985.jpg)

File: 1647673061626-1.jpg (1.2 MB, 2560x1920, 4:3, IMG_20220318_211617168.jpg)

So to resolve the bending jig issues, I came up with a bending jig/vise/alignment frame concept for future bends. A thin sheet of rubber will be used stop it, and a bend goal of about 70-80% with the press. Then the piece will be bolted down, press removed, and the vise used to bring them the rest of the way in a controlled manner.
The other thing was building a new better rib forming die. I designed it then machined it in a couple sessions the other day. Today I tested it.
Results were good. Some minor nitpicks, but the depth is consistent, alignment acceptable, and edged fairly crisp. Forming the linger rib seemed to require slight more pressure then was available, however, because it didn't flatten the sheet back out at the end of forming.
The forming tool itself is kinda cool. Inserts held in place with setscrews, and in this case the inserts can be flipped around and combined with each other for different lengths/end positions etc. Is sort of slick

 No.732

>>730
i lik burgr kang

 No.736

>>723
>we made a pie with pizza filling
how'd it taste?

 No.737

>>736
pretty good, the mix of pepp, sausage, and green bell peppers was pretty godly tbh
those bell pepps really add a lot when they get cooked

 No.738

stopped by yesterday and attempted a bend without the UHMW pads
blocks still slipped, so going to have to do something else.
probly just make a "positioning" plate that has the purpose of putting everything the right distances, and will keep the blocks in place by putting the bolts in shear.
definitely not ideal loading, but i'll do some math to make sure nothing gets too crazy

 No.739

>>738
nothing is worse than slippery blocks shorkcel

 No.740

>>739
ya its kinda crazy how little lubrication is needed to bring steel on steel down to a relatively low static friction coefficient

 No.745

>>740
I know right. me and you have a lot in common we should be friends

 No.746

>>745
wow really maybe we can read a LN together

 No.747

>>746
ask your MAL friends to read it with you

 No.757

File: 1649610495707-0.jpg (294.47 KB, 1536x2048, 3:4, 277188663_1410789079425832….jpg)

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big progress– did the math to see if the positioning plate would work, numbers were close but it looked good
made it and did the bends
good results. ribs survived. fairly consistnet. actually bent it too tight on the second bend so its trapezoidal, but i can just break my tacks and adjust.
one weird thing is its actually lightly curved like a banana (maybe about 1/16" of an inch?). im still trying to figure out exactly how that happened
big step forward, though

 No.758

>>757
>day skin
yeah

we need to talk about your 23andMe results

 No.759

>>758
whats day skin?

 No.760

notes for next attempts:
- prevent mid beam deflection by making a 1/8" steel flush pressure pad along with some flat head retaining screws
- make a section profile spacer plate to prevent overbend during second bending (in the future, combine this with the punch)
- adjust flange length for a perfect seam upon final bend (for fusion butt weld with TIG)

also adjust 1 & 2 for existing bent flat before moving on to next steps

 No.761

some other stuff ive noticed
radius on the rib side is slightly crimped
tube is not square, especially on the front (its like a parallelagram). this likely happened because the bends happeed unevenly, and one side got overbent significantly
the guide rod base has a cutout at the bottom to accomodate overpen from the weld seam
i might have to increase the size tolerance for my tube to account for manufacturing defects

 No.762

also after measurement, opening still isn't opened the same, in the middle inch, over .01" difference in width

 No.763

>>761
yah we know you love increasing size tolerances for tubes

 No.766

>>763
oh wow just wow
rewd

 No.770

update?

 No.771

>>770
i opened it up a little more, but it still wasn't square (needs to open more)
i might go tonight and do that, i'll bring my calipers and actually measure one side to the other

 No.773

ok i've got updates, will post later sunday

 No.775

File: 1651452455897-0.png (8.55 KB, 191x255, 191:255, 1651452286632-0.png)

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Latest developments
I opened it up until square, actually significantly larger than I was expecting. Not sure if when I made the tooling I did that intentionally? But everything fits perfect, so doesn't matter either way. I just tacked it maybe 8 places evenly before machining
The issue with being out of square mostly disappeared, it turned out that only one side wasn't bent all the way on the front, and that was enough to throw it out of square when welded.once the pocket up front got machined it spring open on that side (that's why I have it clamped.
3d printed trunnion is in, guide rod and bolt carrier installed. Fits on the lower well but the fire control pocket is a little too small and it hits on the bolt hold open.
Gave a good lesson on work holding, glad I decided to take this one as far as I can, the 'production' one will be nice as a result.
Receiver is still slight banana shaped, but I think that will resolve by adding anything flat and rigid on top along with proper welding procedure
Next will be the cutouts for the bolt handle and holes for the cam pin rail

 No.776

File: 1651452733829-0.jpg (527.88 KB, 1920x2560, 3:4, IMG_20220501_131316466.jpg)

File: 1651452733829-1.jpg (622.8 KB, 1920x2560, 3:4, IMG_20220501_131339623.jpg)

oops sorry posted some image thumbnails on accident
also the camera/lighting did some weird shit, they look surprisingly decent considering i did all this on the fly
especially the last one with the clamp looking head on, the pic gives the illusion its not square, it is it looks p. clean IRL

 No.778

>>776
looks great, can't be too far off now right?

 No.779

>>778
nope its gettin real close.
still big hurdles ofc, but the bending stuff is the hardest and most involved.
the other stuff is just tedious machining (machining trunnion, machining front sight block, etc)
i'll 'finish' this one (i'll make simplified components with the critical features on it) so that when i do my next one, i'll have everything figured out and it'll be nice

 No.791

File: 1651731791286.jpg (459.21 KB, 2560x1920, 4:3, IMG_20220504_230807704_2.jpg)

milled out the charging handle slot and the plug holes for when you weld the cam rail in.
noticing some unintentional differences with my stiffening ribs, namely the top one should be closer to the cutouts and a tad longer
can adjust on the final one.. kind of annoying though i'll have to mill a new female die
also fucked up milling the front of the charging handle slot, accidently grabbed an 11/16" with a 5/8" shank instead of a 5/8", so the front is 1/32 too big all around
really sucks, even though this is just the 'test' flat, it would have been nice to have a good looking one

 No.795

File: 1651963280558.jpg (953.4 KB, 2560x1920, 4:3, IMG_20220507_153339074.jpg)

Slightly better one of the upper
My camera sucks

 No.797

>>791
Can you reuse any of the material you goofed on?

 No.798

>>797
I can reuse some of the tooling, if you mean this receiver nah not really but that's ok
I have a pretty good feel for what not to do, so chances for the next one to be near production quality will be good

 No.802

>>798
Thats cool. Making mistakes is a corner stone of learning. Its pretty impressive what youre doing.

 No.805

>>802
thanks
its been a really long time doing this project on and off
tonight, i will try to machine the trunnion

 No.807

ugh nvm wont happen tonight
tomorrow, if im lucky

 No.809

ok well i went sunday, almost got it done but accidently scrapped it
unfortunate but i know what to avoid next i suppose

 No.811

>>809
What happened that made you have to scrap it?

 No.813

>>811
so i did the press fit stuff perfect
when i was cutting the features on the bottom my endmill slipped in the collet and i lost some Z without realizing it
it was probly because its a pretty dull end mill, the collet may have been dirty too
anyway i broke through the press fit wall of the trunnion
also snapped the shit out of my 1/4" endmill on a plunge lel
i'll probly post a pic at some point

 No.815

>>813
trying again tonight

 No.816

FUCK this is gay
tire blew out on the way
so bad the mexican shop in the bad part of town wasn't even willing to patch it
gay gay gay gay gay

 No.817

>>816
>not even the Mexicans will patch it
lelelelel

 No.818

File: 1653334559834.jpg (60.82 KB, 668x669, 668:669, IMG_20220523_123145780~3.jpg)

got the trunnion made
went mostly ok, made a single mistake that resulted in damage to the front of it (not pictured) that was completely avoidable and I'm retarded
this one is good enough to test, tho

 No.819

>>817
sir STOP lelling..

 No.820

next time i go, i'll try to machine the barrel extension down and maybe press fit it
also will try to machine the front sight.
thats sort of a complicated on, but once its done thats the last major part
i have to make the cam pin rail too but thats dead simple

 No.821

File: 1653531240051.png (316.11 KB, 495x495, 1:1, babby cr disapoint.png)


 No.822

>>795
>my phone sucks
yeah it does. Get a goolge pixel like everyone else in the world, fag

 No.824


 No.829

File: 1653808865826-0.jpg (997.74 KB, 1920x2560, 3:4, IMG_20220528_224243595.jpg)

File: 1653808865826-1.jpg (212.52 KB, 2146x1133, 2146:1133, IMG_20220529_000549385~2.jpg)

File: 1653808865826-2.jpg (1004.26 KB, 1920x2560, 3:4, IMG_20220528_213607729.jpg)

Machined down the shoulder on the barrel extension and press fit it, no issues
Machined the cam pin rail
Welded aforemebtion two things onto receiver
Things are looking promising. Once I get the front sight done I can look at headspacing the barrel, making the rear sight, and test firing

 No.830

>>829
so looks like might barrel extension is canted a degree or so, enough that 2 of the lugs have a very light interference with the bolt. Not sure if I should go through the effort of removing the extension or let it wear in

 No.831

>>830
for further context, it does go into battery

 No.832

did some troubleshooting with my friend looks like part of the issue was the rail wasn't perfectly aligned and was pressing hard on the cam pin, once the rail got moved things are pretty smooth now

 No.833

>>829
Looking p good fam

 No.836

>>833
thanks i'll post updates if i get some this weekend.. or earlier??!?!

 No.837

>>836
its your world, post them whenever :D

 No.839

ok so 1st attempt for the front sight
broke my 1/4" 2 flute end mill which i need to do most of the features– confirmed that my placement for the gas port was acceptable, depth of that stuff/thread depth was ok
but then when i tapped it i accidently tapped it an an angle, so its scrap now. i bought enough raw material to make one more, so i'll make a couple tweaks to the design to simplify it plus make a better sequence of cuts now that ive tried it once

 No.844

File: 1655632250089.jpg (441.91 KB, 2560x1920, 4:3, IMG_20220619_024536664~2.jpg)

Machined a front sight. Had to leave off some of the more swoopy contours because it was just too complex. Fixture I made for doing the curves was finicky enough that I only used it for the large diameter around the barrel. Had one or two small mistakes but nothing that will affect function.
Once I headspace the barrel, I can drill the gas port and test fire.
oh I still have to make the rear sight though

 No.845

>>844
MUH GOCK

 No.847


 No.848

>>844
whoa how many walmarts can you shoot up with that?

 No.850

>>848
i guess that depends how much ammo you have

 No.853

>>850
You have infinite ammo when you repack your used shells =D

 No.855

>>853
thats too autistic even for me

 No.859

ok the latest:
>tool came in for holding the barrel extension by the lugs
>did preload calcs for the barrel/extension
>did some geometric checks to see if my chamber depth was deep enough to be safe
>figuring out how i'm going to headspace/how im going measure the gap i need for my spacer
that second to last one was kinda interesting
to elaborate a bit, theres a couple different ways that headspace is typically done. the most conservative way would be to make the bore as deep as possible, then adjust from their to get proper headspace. that way the maximum extent of the cartridge is supported
i had no idea what if anything was done with this barrel, because i bought it from some guy outside a UPS warehouse and it has no markings. its pretty weird for these things not to have an extension on it already too.
so what i did was measured how far the gauge sticks out when fully seated, then looked at the internal geometry of the case to see how much needs to be supported to not explode. then some simple geometry to make sure the cartridge is adequately supported throughout the entire safe range of headspace
i need to modify the barrel extension tool to fit inside the receiver, then make essentially a crowfoot to fit split clamp that ive got on the barrel so i can torque it to the range i need. since the shoulder on the barrel is further up than the proper headspace range, i'll need to machine a spacer to fill the gap. that spacer needs to be the proper size so that after im done torquing to the number i determined, the barrel will be in the safe headspace range

 No.860

i made the crowfoot, the machining went great came out beautiful, then the welding went mostly ok except one of my welds looked a little ugly so i was going to do a pass over with teh tig torch but i forgot to turn the shielding gas on and it did fucking NASTY stuff
spent like 2 hours trying to clean the weld up to something that didn't look like disgusting
also i added a relief cut to the barrel extension tool, so it fits now (it didn't fit before).
that was a obnoxious

 No.867

>>860
It's crazy to think you've taken all this time and precision creating this, and there's probably kids stamping parts in my huts in Africa and South East Asia for the same reason. Really makes you wonder.

 No.869

>>867
>probably kids stamping parts in my huts in Africa and South East Asia for the same reason
wait if they're your huts why wouldn't you know if they're stamping parts or not?
and why do you have huts in africa and south east asia??

 No.870

THE BARREL IS HEADSPACED
LETS
FUCKING
GOOOOOOOOOOOOOO

 No.871

>>869
Mud huts*

 No.873

>forgot to turn the shield gas on
damn man did you go full retard and shit it up entirely or just zapped it real quick and realized you fucked up?

 No.875

>>873
i went full retard for like a full few seconds wondering why this thing was popping and bubbling all over the place
it turned out fine tho, grind it down, went back over it. a bit of porosity but double sided fillet was overkill anyway
headspacing went super smooth. very easy, i've got a good system now. cheap too

 No.879

designing a rear sight
hope to make the rear sight wings this weekend

 No.881

>>875
you should prolly still double check it after the first time firing it but you know what youre doing good luck

 No.882

>>881
i'll be extensively checking brass, primarily

 No.884

File: 1657555768696-0.jpg (289.35 KB, 2526x1249, 2526:1249, 1657555512598-0.jpg)

File: 1657555768696-1.jpg (1.02 MB, 2560x1920, 4:3, 1657555512598-1.jpg)

File: 1657555768696-2.jpg (940.65 KB, 1920x2560, 3:4, 1657555512598-2.jpg)

Well it looks like a gun now
3d printing a stand in rear sight now. Have a bit of cleanup to do on the rear sight since I made it by hand
Will finish welding next time. Rear sight wing holes didn't line up, so will need to plug a side and redrill.
Did some other stuff too including some fuckups, I'll write those up later

 No.885

>>884
Looking good my guy

 No.886

>>885
ur lookin good bby 😎

 No.887

did some naaaasty welding on the rear wings, contouring them to look nice with the dremel
i dont really care tbh im gonna hammertone rattle can this bitch to hide most flaws anyway
debating whether i'll even parkerize it

 No.888

got a lot of cosmetic flaws cleaned up this week (lots of welding, grinding, filing)
i didn't want to do any of that but i just can't fucking help myself
i still have a couple spots i need to weld (finish the seam on the receiver) but then thats it
then i'll sandblast it (probly with playsand like ive done before), then wash it, parkerize it, prime the exterior, then hammertone paint.
oh also still have to clean up the front sight block, drill the gas port etc
gettin pretty close tho, most of the major construction is done

 No.892

another 6ish hours of grinding/sanding
i've got most of the weird cosmetic flaws feathered into the good stuff
i have a lot of experience doing dremel magic after i did the CETME a few years back
being a lot less careful this time though since its going to get a thick hammertone paintjob which will hide even big fuckups
i also split the difference for the charging handle opening where i drill the hole 1/16 too big, i enlarged 1/32 both sides and blended it over the full 4-5 inches
hides pretty well. looks decent
action is feeling very smooth. with the dog leg charging handle i can still induce a malfunction if i push or pull down on at, but i think im ok with that. shouldn't happen during firing, and this is just a prototype so im willing to make compromises. i really dont want to have to push this thing out and repress fit it at the right orientation, although that would be the proper action.

 No.896

>>892
nothing is worse than a malfunctioning dog leg charging handle…

 No.897

whats wrong with the charging handle does it keep barking at you?

 No.898

File: 1658288018495.png (10.37 MB, 3264x2448, 4:3, ClipboardImage.png)

>>897
so with a regular charging handle, the handle itself isn't very long.
the dog leg one comes out about 2-3 times as far, and is also offset way above, pic related.
the result is its pretty easy to torque the guide rods pretty hard. easy enough to rotate the entire bolt carrier a couple degrees
well my locking legs are already sllightly canted because i didn't press the barrel extension perfectly aligned, so pulling down on the charging handle can induce a malfunction where the bolt lugs can't rotate far enough to unlock fully

 No.899

better post vids of testin

 No.900

>>898
how bad does it get stuck if you do that? like you gotta kick the shit to loosen it or just smack it a little?

 No.901

File: 1658360422803.png (16.19 KB, 500x250, 2:1, Oekaki.png)

>>900
as in 100% stuck while in the induced position
kaki for illustration. in normal conditions, theres enough clearance for the bolt to clear the lugs. when charged at the wrong angle, with the dog leg charging handle, its possible to rotate the entire bolt carrier/guide rods/ bolt enough to suck up that clearance and prevent fully unlocking
if it were to get fired in that position may well tear off a portion of the lugs during unlocking. it wouldn't be dangerouse unless unnoticed and i were to keep firing
will post another pic in a second showing a bolt and lugs in case you're not familiar

 No.902

File: 1658360649056.gif (964.27 KB, 720x404, 180:101, giphy.gif)

>>900
>>901
heres an ar15 cutaway gif which has an essentially identical locking system

 No.904

finished my welding, went really well. got my settings figured out on my welder finally. used a big piece of aluminum as backing. easy and clean
then spent 3 hours trying to get my siphon blaster to work. compressor is way too tiny, too much moisture in the air. won't pull. nozzle worn out. not enough siphon effect

 No.909

woah that thang can kinda kill nigrs

 No.910

ok i'll post progress pictures today
last night i drilled the gas port, dimpled the barrel for a set screw, and threaded the front sight (for said set screw)
i wanted to sand blast but im having a hell of a time getting my siphon blaster to work.. i think my air is too wet. what a pain…

 No.911

File: 1658714678245.jpg (1.23 MB, 1920x2560, 3:4, IMG_20220724_134440032.jpg)

Handguard length exceeded the dimensions of barrel journal and handguard retaining ring (about 1/16).

Likely reason is that trunnion is longer than actual. Handguards and retaining ring were shaved down the required length at front for gas block to position properly.

Trunnion was not installed straight. Misaligned by about 1/8 over 12 inches. Makes front sight block appear canted. Seems to be within workable tolerance of the piston system.

 No.912

File: 1658714804832-0.jpg (1.45 MB, 1920x2560, 3:4, IMG_20220724_184532640.jpg)

File: 1658714804832-1.jpg (1.29 MB, 1920x2560, 3:4, IMG_20220724_184544815.jpg)

File: 1658714804832-2.jpg (1.41 MB, 2560x1920, 4:3, IMG_20220724_184650099.jpg)

Fuck other pics didn't post.
Shown are the gas port, fitup of the retaining ring/front sight/handguards

 No.913

File: 1658715966196.mp4 (62.49 MB, 1920x1080, 16:9, AssemblyCompressed.mp4)

quick video showing assembly and getting a few angles on it

if you saw the blem above the gas port with the tap wrench pic, tis because my edge finder jumped the edge and gouged the journal. wild what machine tools can do

 No.914

>>913
lookin great budy. do you have to make custom mags for it too or is it compatible with factory shit?

 No.915

>>914
they take stock AR mags
even the original AR18 took slightly modified AR mags
so im set

 No.916

>>915
Does it fire 5.56?

 No.917

>>916
it does

 No.918

can't wait for a video of it shooting at thangs

 No.919

>>918
ALEXA
give me directions to Ironton, Ohio

 No.933

thread protector came in, looks kinda gay but wtver i can't put a flash hider on it here legally
also decided to get my handguard 3d printed because its fucking cool for me to have designed all the furniture, the website is broken and accepts expired coupons that are supposed to be way more expensive shit, and i wanna see how closely i was able to reverse engineer them. they should arrive next week sometime
also need to make a new rear sight and system for how the rear sight adjusts, last set didn't work

 No.945

File: 1659994682769.png (39.63 KB, 532x333, 532:333, ClipboardImage.png)

nice, handguards should be here wednesday
hope they fit

 No.946

>>945
I would've invested in a sneeze guard instead

 No.948

>>946
w-ww-w-w-ww-ww-w-w—ww-w-w-whatdo you mean????!??!?!??? .. ?1

 No.949

File: 1660026041251-0.jpg (1.01 MB, 1920x2560, 3:4, IMG_20220808_185833101.jpg)

File: 1660026041251-1.jpg (829.64 KB, 2560x1920, 4:3, IMG_20220807_195232918.jpg)

Got the heat shield flats cut out
After I do the bends I'll cut out the remaining material
Then I'll clean up any ugly eges and sandblast it with the rest of the stuff to give it a dull finish

 No.950

>>949
Bout ready to brougleigh them niggas huh?

 No.951

File: 1660089228670.png (740.76 KB, 600x800, 3:4, ClipboardImage.png)

>>950
>broughleigh
ok nerd lmaoo



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