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

/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.

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)

File: 1573956382225-2.png (20.86 KB, 905x371, 905:371, Unradiused.PNG)

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

 No.214

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



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