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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)

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[View All]

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?
287 posts and 89 image replies omitted. Click reply to view.

 No.1170

is that really shorkcel I'm confused

 No.1171

>>1170
don't be confused

 No.1172

File: 1667365558720.png (168.14 KB, 318x454, 159:227, ClipboardImage.png)

>>1167
not yet but i'd like to make at least one knife
i bought this a while ago
and my coworker (who is literally fucking blind as a bat, 20/250 vision) made a really nice lookin tanto knife, so i'd like to pick his brain

 No.1173

>>1171
sometimes you just need a bigger stronger guy to make you feel safe and less confused…

 No.1174

>>1172
woah
this spigga MATHS

 No.1175

>>1174
you cant say that word thats OUR word

 No.1178

i degreased parts today
will try to get things blasted and phosphated sometime tomorrow

 No.1179

engineerbro, how to make a lathe without using another lathe?

 No.1181

>>1179
you just handbuild a 'shitty' one, then you use that one to make a better one
p. basic tbh

 No.1183

>>1179
use your friends lathe

 No.1184

>>1179
use a drilldo

 No.1194

fucked up my parkerizing, even ended up getting some of the solution on the grill (its a manganese-phosphate soution) so that shits probly NOT good
literally accomplished nothing except messing up my sandblasting. i'll alternately rub it down with 120 grit aluminum oxide media and a toothbrush, then i'll brush it with some warm acid to try and induce an even layer of rust
then boil it in water. should convert the oxide layer into magnetite
can be done multiple times

 No.1195

>>1194
sounds fucking hot

 No.1196

>>1195
the parkerizing is in the range of 190F, the rust bluing ofc is at 212F

 No.1198

>>1194
wont that just evolve it into magneton?

 No.1199

>>1198
just tap b during the evolution and it will stop…

 No.1222

update?

 No.1223

>>1222
Zoomer quit at work so now I'm doing the work of 4 people. Made some really neat simulation tools at work but no progress here
Sorry

 No.1225

>>1223
you will ping me in next weeks nfl thread if any progress is made

 No.1226

>>1225
ok, i'll try and get you something to look at in the next week

 No.1231

>>1226
specify what you mean by something

 No.1232

>>1231
heem gonna upload feet pics

 No.1233

>>1231
>>1232
ive figured out how im going to rust blue this thing
part of the issue is its a bitch to actually find a container long enough (27ish inches), thats not fuck yuge (say, a 50 gallon drum) to boil this thing in
i had a thought that maybe i could steam it for teh same effect, and found someone who did something similiar online
so i'll build my steaming apparatus this weekend. i have some 6" PVC thats long enough to do that. i'll put it over a pot of boiling water on a hot plate.

 No.1234

>>1232
you know what they say about guys with soft hands

 No.1235

>>1234
they've got soft cocks?

 No.1239

ok i did some messin around with rust bluing yesterday. just the small parts, so i can do it in a pot
ya it seems to work alright. definitely some lessons learned
>very sensitive to grease
>better to paint the rust solution on rather than dunk it
>not entirely sure if it matters how you 'card', the superficial layer of magnetite seems to rub right off. maybe carding with more aggresive abrasives makes the final finish more durable??

 No.1240

File: 1670791371073.jpg (1.27 MB, 1920x2560, 3:4, IMG_20221211_121334415.jpg)

So the results from my second attempt:

Pictured dried.

Some of the issues: inconsistent surface finish. Some spots just never really rusted properly and converted to magnetite, specifically on the rear sight dial. Might be because of the forming process pushes the grease into every microscopic crevice

Also some pitting from my accelerated rusting process. I think getting a nice consistent rust on the first shot is important, and will put more effort into degreasing in the future

The finish is awesome after oiling tho, very slick and slippery, and a deep deep black color

 No.1241

File: 1670793315668.png (5.93 KB, 500x250, 2:1, Oekaki.png)

harassment was requested and it will be delivered sexually

 No.1242

this thang jus shoot airsoft don't it quit playin

 No.1243

>>1242
ya it does hey wanna play airsoft sometime?

 No.1245

spent the past 3 days experimenting with making my own rust blue process, been making some really good headway

giving a quick writeup of the process ive been through, some observations, and where i'm headed
so my first attempt the day before >>1239, learned you really do need to degrease well and (didn't know this yet) deaerate your water

>>1240 second attempt involved dropping parts directly into a vat of hydrogen peroxide salt solution. reaction was vigorous, and continous as rust flaked off and continued to react with the solution even without parts. process was tedious (went at least a dozen cycles), finish was splotchy, and surface had some pitting

monday i started the process of looking for a better method. i found one that involves making a solution of vinegar, hydrogen peroxide, and salt, then wiping a thin layer onto a heated work piece. i tried this successfuly, however for anything beyond simple geometry it becomes very tedious. dipping a piece into the solution resulted in splotchy surface with accelerated localized corrosion resulting in pitting. it also required many applications to before it was ready to go in the boiling water.

i was going to do a writeup on what i think is going on with the chemistry, but its so much of a guess that i decided to delete it. instead i'll just post observations.
>higher temps result in faster rusting in general (duh)
>lower 'wetted' durations (less submerged time + heated drying time) resulted in a more even rust without flakes or pitting
>surface tension of water results in beading causes streaks and dots when drying submerged pieces.
>acid solutions may speed up rust reaction, but seems more superficial (wipes off) and more prone to flakes/pitting
>significantly heating up an even rust layer in air appears to cause a beneficial reaction (turns brown, doesn't rub off)
>if water isn't deaerated corrosion continues during boiling

so something i realized early on is this process is fucking tedious and i dont want to do it a lot. its not realistic for me to to do this without dunking. dunking causes issues with spottiness and runs. i theorized it was due to the water beading up. isopropyl alcohol readily mixes with 3% hydrogen peroxide and acted as an effective surficant. dunking of test pieces has resulted in an even, durable rust. work is still ongoing but progressing well.

 No.1246

>>1240
you didn't ping me in the nfl thread

 No.1248

>>1246
yes i did >>>/sp/>>1522668

 No.1249

fuck >>>/sp/1522668

 No.1250

>>1248
I wasn't there when you posted that

 No.1251

>>1250
>i wasn't there
an executable offense

 No.1252

so while the rubbing alcohol helps with wetting, it seems to cause other issues causing localized corrosion. I think it has something to do with the salt
I'm moving towards a 2 step process involving a priming agent and am oxidiser. For my rusting agent I want something polar that doesn't leave a residue, react with salt, and has a low surface tension. Oxidiser will be hydrogen peroxide

 No.1253

>>1252
testing stuff out with methanol now…
strong stuff. a shot of it feels like 3 shots of vodka

 No.1254

so i was hoping the methanol could work as a primer but it seems like despite being polar it cant absorb enough salt to really do the job great. i know the stuff mixes well with water, maybe the two combined could lower the surface tension enough and have enough salt to be effective like that.

it does seem to mix very well with hydrogen peroxide tho, and ive been trying it as a single mixture again. you can definitely tell the surface tension is low, stuff wets beautifully. might have some minor pitting issues? hard to tell before you're completely done

 No.1255

wew ok not gonna fuck with methanol anymore
been drying parts off that were dipped in the shit for a few hours now
didn't realize JUST how toxic this shit is

 No.1258

File: 1671347290997-0.png (65.04 KB, 994x682, 497:341, ClipboardImage.png)

File: 1671347290997-1.png (76.91 KB, 999x514, 999:514, ClipboardImage.png)

ok not like im gonna do any of this because ive already scared myself fucking around haphazardly with poison, but this open AI shit is fucking amazing. not that i would trust the results, but god damn does it give you a place to start digging. from what i can tell, its making the same guesses i am

 No.1259

so bizarre, you the chatbox can do really complex shit, but manage to screw up stuff like providing proper NFPA hazard diamond values. thats the sorta shit that has its data tabulated, you'd think thats what it gets correct.

 No.1260

russians actually give a shit about making chemistry info available, apparently
http://chemister.ru/Database/search-en.php

 No.1262


 No.1263

>>1258
>doesnt fuck around haphazardly with poison
ngmi

 No.1267

>>1263
Don't worry see >>1258

 No.1268

>>1267
Oops I meant >>1255
see >>1255

 No.1269

>>1258
yadda yadda yadda are you gonna FUCK this AI or can i?

 No.1270

>>1269
he only creates cuckold stories about his pinay gf with it

 No.1271

>>1269
haven't tried yet tbh



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