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/h/ - Hobby Autism

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Onion domain: http://ylcjjrqko7pgobnvzreemm565ea3oj3c7rfqqb4x4twmay6hafv54mid.onion/

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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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.



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


would anything in ar180s.com be helpful? eg:


>would anything in ar180s.com be helpful? eg:
extremely helpful. im already in correspondence with Rick Kelley (the site owner) by email
>I would think that this "approximation then refine" strategy would be a huge disaster and time suck
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


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


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

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


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


mmkay keep us updated OP


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


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?


sorry i mean ar180b not ar180

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