/cad/

...what

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>>33789874
...huh?

>>33789874
>he doesn't know what 3d printed guns are

>>33789879
I'm not an engineer. Does this work?

>>33789865
>requires account
You're a faggot and you know it.
Upload it to mega.

>hammer-fired open bolt with piston-moderated recoil

What the fuck am I looking at?

>>33789888
sure
>>33789927
it's not a piston it's a return spring guide rod

>>33789927
I think the piston isn't a piston, it's just the point where the spring that pushes the bolt is housed.

>>33789948
>>33789949
You guys are right.

https://archive.org/stream/Automatic_and_Concealable_Firearms_Design_Book_Vol_II_-_Paladin_Press#page/n37/mode/1up

What an awful design, nonetheless.

I understand this is a .22, but what exactly is preventing the bolt from hitting you in the face when it inevitably launches out of the gun?

>>33789992
that screw that connects the rod to the bolt

>>33789992
The pin, which would be driven into the recoil spring guide rod after the bolt was in the upper receiver, and stand proud of the upper reciever. Also the nut, which would be attached to the recoil spring guide rod from the front of the gun, and wouldn't be able to pass through the rear of the recoil spring housing.

This link in the post above yours has better schematics.

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>>33789992
>>33790023
Whoops, forgot this

How about having the recoil spring inside the bolt? You could really reduce some of that weight from up front by having only an barrel and an adapter to fit the small barrel into the receiver instead of having this huge barrel/recoil spring housing thingy.

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>>33789865
>>33789870
>>33789876
>>33789879
>>33790029

>>33789865
Recalibrate it to fire 9mm or 380 and you got yourself the glock nambu pistol!

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>>33790043
I was thinking kinda like this.

>>33790029
Thats fucking retarded,ejection will be the main issue.

>>33790143
Hardly, the ejector/extractor setup in this design is literally one of the most basic and most widely used systems ever.

>>33790131
Nambu was a locked breech action though.

>>33790049
>

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You're gonna have a lot of FTFs on that, especially with shitty, soft .22lr bullets. Put a feed ramp in on that chamber or adjust the tolerance between the mag and chamber.

See pic related.

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OP here

>>33791620
Huh, that's pretty clever.

>>33791620
>>33791831
Honestly having the recoil spring inside the bolt would be both easier to make and result in a lighter gun.

>>33789865
>.22 LR
fucking useless

Any working prototypes of this? Would be cool to have one of these weirdos myself

>>33789865
for some reason i thought it was a luger magazine that you load from behind instead of a pistol mag

>>33789865
thank you for sharing
goes right into my collection

>>33789865
I am a mechanical engineer, op... I would advise on mounting some-sort of rifle stock; the recoil when firing and the actuation would be very uncontrollable. Also what alloy/metal are you planning on using? I would advise dipping or platting chromium-vanadium steel on the bolt and firing pin.

>>33789888

I believe it is a straight blowback with the recoil spring above the barrel.

>>33789879
>feed ramp in the mag

why?

That's a bomb

Any one have the glock auto sear backplate?

oh I remember you posting that bolt earlier this week

it looks cool even if the caliber is disappointing :^)

>>33792928
>22lr
>very uncontrollable recoil
>mechanical engineer
yeah, uh, okay

>>33793944
oh shit nigger, you are right i had no idea it was a 22. put a drum on that bitch and call it a day

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Very cool, OP. Anybody got any more like this?

>>33789865
This is neat but kind of over engineered for a direct blowback .22.

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>>33795303
Eh, I was working on this a long time ago but it's probably never going to get built because it's a lot of work and I've never done anything like it before. It was a 10mm lever delayed blowback downward ejecting bullpup design, intended to take glock magazines. Ran into some issues trying to figure out how the extractor would work because it would need to be on the bottom of the bolt. In the RDB it's a double feed magazine so they can have the locking lugs protect the extractor while it's stripping bullets from the cartridges, but the glock mag is single feed so it's not practical.

Also missing from the design is how to control headspacing, but I think I got that figured out. There'd be precisely machined shims that go between the barrel indexing lug and the body of the receiver to adjust how far back it sat in the apparatus. Never bothered to include that though.

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Just had the idea last night for a RFID "smart gun" that is unlocked by a RFID ring on the user's finger, with the antenna built into the grip. It would just be a Sig P320 frame so not even legally a "gun" and it could be sold over the counter. It would be powered by an Arduino controller with the battery in front of the trigger guard. Potentially could include a LED light too if there was enough room but it would reduce the potential life of the locking mechanism. The Arduino would sleep until a "grip safety" at the back was pressed, at which point it would wake and authenticate. When released after a short time the gun would lock again.

It probably wouldn't trigger the NJ clause restricting normal firearms because it technically wouldn't be a "gun" but an accessory. Also there would be a tool-operated switch in the magwell to disable the RFID safety system to combat fears of the signal being overpowered or it being remotely disabled. It's more of an advanced retention device than anything.

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>>33795550
I just know people will sperg out about it regardless though. Everybody always does whenever it's mentioned.

>>33795550
>it technically wouldn't be a "gun"
m8, the gun control lobby writes NJ gun laws they will make it a gun and it will be a proof of concept to fuck everyone over.

>>33795530
>lever delayed
>downward ejecting
>10mm
>references the RDB
have my children

also look into the JARD downward ejecting bullpups for ideas about archaic bolt design (and the ejection)

>>33795550
>arduino
>LED light
>RFID ring
kill you're self

it's clear you are not an EE. in the future replace all instances of "arduino" in your vocabulary with "microcontroller" and you will sound less like a bumblefuck

electronics do not belong in firearms, no matter how reliable or feasible you think it may be

>>33795573
You already have proof of concept with other guns. It's not exactly hard to make an RFID reader and you can buy all the parts (and small enough to fit into a gun) for like $60 online. I don't think a P320 grip is considered a gun literally anywhere in the United States. Besides, it's not truly "locked" to it's user.

>>33793548
it uses ar7 magazines

>>33793827
ohh boo hoo

>>33795523
but it looks badass

>>33795303
https://grabcad.com/sm-24/projects

>>33795648
lol

>>33789865
>can't even pull fastener CAD files from McMaster

garbage-tier

>>33795648
This is undoubtedly true, love the bolt design. If I ever move out of this hellhole and set up a hobby machine shop I'd probably steal some elements of your design while moving the magazine forward of the trigger so I can have something that looks like a sheetmetal abortion of a Mauser

>>33795642
Nah, I'm a software engineer. I said that specifically because I was going to use a smaller version of the Arduino zero board (neutrino). I don't know nearly enough to make my own microcontroller and the point is to try new things and enjoy it. I take it you are desperately opposed to any electrical reflex sights too, which means you're like stuck in the past mannnnnn.

>>33795677
now it's time to reconsider your command of the english language and review prepositions, starting with "in" and "on"

programmers need to have the highest level of scrutiny when it comes to syntax. i'm disappointed.

your CAD mockups are nice. sounds like you should have gone mechanical

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>>33795775
>You're stuck on the past
Nah, you're wallowing in it. Just wondering, what's your opposition to LED lighting? It seems brighter, more space efficient, and more energy efficient than traditional methods.

>>33795880
holy fuck, learn to read
Electronics do not belong IN firearms.
Electronics ON firearms are different and circumstantial. Electronics should not be required for the operation of a firearm in any way.

>>LED light
blinkenlights are for retards, it's the hardware equivalent of a hello world, and putting them in a deliverable is rarely justified

in this case you would know the pairing worked if your trigger unlocks; you don't need a visual indicator

another note: actuating the safety mechanism will be a bitch and will kill your battery life. you will have to design around it; don't expect this to be slapped into a COTS handgun

some of this could be excused if you wanted to include a battery pack for a torch which would also serve as a power source for the solenoid to actuate your safety. it's not clear from your wording what you intended (the power requirements for a flashlight are very different than that of a mcu)

you also do not need an mcu for this design, you could just use the RFID module to control the solenoid directly if you designed it well

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https://grabcad.com/library/crd-mac-10-inspired-smg-unfinished-1

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>>33796055
https://grabcad.com/library/960-rowland-p-9mm-smg-unfinished-custom-1

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>>33796072
https://grabcad.com/library/crd-m-45-inspired-smg-9mm-unfinished-1

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>>33796082
I've got many other projects, too...

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>>33796052
I made a mistake, no need to be so upset. I was throwing around the idea of using a LED as a flashlight, not as an indicator light. If I had an indicator light it would be shrouded behind a translucent material so the lines would be smoother and it wouldn't shine into the user's face.

I was going to use a battery in the same position where a light would be mounted on the gun, but integrated into the frame. I may be able to fit up to a 2000mAh battery in this space but I'm not sure.
As I said, I'm not an electrical engineer or a computer engineer so my prototype would use off the shelf components. I'd like users to be able to add new authentication keys, which makes a more powerful microcontroller worthwhile.
I can't say how the safety will work internally until I have a gun in front of me to play with.

>>33789865
What software did you use to model this?

>>33789865
could it be scaled up to function with things like .17 HMR, .25 and 32 ACP, .380, and 9mm Makarov?

>>33797088
solidworks

>>33797355
sure

>>33797378

Next up, how are the sights attached, are they integral to the the frame or dovetailed in or something, asking because it could be further simplified with a simple guttersnipe sight a la the ASP. Also why have the recoil spring above the barrel as opposed to wrapping it around the barrel like PPKs and its derivatives?

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>>33789865
>uplaoding this shit to grabcad

Why not use literally any other file sharing service out there

>>33797412
see>>33791620

>how are the sights attached
welded/spot weld

>>33797431
to piss you off :)

>>33797441
Ahh, safety feature. Also the addition of a M93R style folding for grip at the front would be a nice addition,as well as maybe a simple wire stock for full auto control. Also you should try something akin to a 3D printed Astra 300

Somebody should design a homemade blowback double barreled .22 SMG. Much lighter, easier to build, and safer than a 9mm, cheaper to shoot, more available parts and ammunition in shitty countries, lots of stopping power.

>>33798006
so a .22 villar perosa?

>>33798006
>homemade
>more available parts

if you have the tools to make a blowback double barreled .22 SMG. then you have the tools to make spare parts for all guns.

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>>33797485
>M93R style folding for grip at the front would be a nice addition,as well as maybe a simple wire stock

You can mod it yourself you know.

>>33798653
that stock is going to get in the way of getting to the cocking knobs

>>33798679
read that as cockring knobs

>>33798711
get your mind out of the gutter anon

>>33798715
or you could join me there anon ;)))))

>>33798679
I was just dong a quick mock up

>>33794065
Fucking freshman engineering students already calling themselves MechEs

>>33798980
you are insulating and i am very angry.

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>ctrl+f ITAR
>0 results

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>>33798995
i feel your resonating from my laptop to my face feels warm keep it up anon only you can keep me alive from this terror that we all must suffer for so be t a magical place.

>>33798995
I'm sorry that the basics of engineering and engineering drawing finals were so hard. I'm sure you did fine, sophomore year is when the true culling begins.

>>33799021
>>33799037
this is subjective.
but if you threaten me or insult me or try to dishonor and or hurt me i shall defend my liberty and honor.
have a nice.

>>33789865
I L L E G A L
L
L
E
G
A
L

>>33799077
Not for US citizens, to download at least. OP dun goofed tho. You're supposed to ask permission from some letter agency before you go around making guns available to Russians, which is literally what ITAR was written for.

>>33799094
ITAR a shit.

I don't think it's still current, but I remember fifteen years ago, a lot of cryptographic tools used to have to be hosted on Canadian webservers because of that bullshit.

>>33799054
fedora