No.747
>>746ask your MAL friends to read it with you
No.758
>>757>day skinyeah
we need to talk about your 23andMe results
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
>>761yah we know you love increasing size tolerances for tubes
No.770
update?
No.771
>>770i 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.778
>>776looks great, can't be too far off now right?
No.779
>>778nope 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.797
>>791Can you reuse any of the material you goofed on?
No.798
>>797I 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
>>798Thats cool. Making mistakes is a corner stone of learning. Its pretty impressive what youre doing.
No.805
>>802thanks
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
>>809What happened that made you have to scrap it?
No.813
>>811so 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
>>813trying 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 itlelelelel
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.822
>>795>my phone sucksyeah it does. Get a goolge pixel like everyone else in the world, fag
No.830
>>829so 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
>>830for 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.836
>>833thanks i'll post updates if i get some this weekend.. or earlier??!?!
No.837
>>836its 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.848
>>844whoa how many walmarts can you shoot up with that?
No.850
>>848i guess that depends how much ammo you have
No.853
>>850You have infinite ammo when you repack your used shells =D
No.855
>>853thats too autistic even for me