Why aren't guns made on aluminum frames anymore? The Colt

The mossberg 500 is still made with an aluminum receiver isn't it?

>>34207346
They are hard to put a finish on and get ugly with age. Plus it's more expensive than plastic.

>>34207346
i think steel is cheaper. dont quote me on that tho

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>>34207346

Polymer is cheaper and lighter for auto loaders. You don't need a metal frame.

>>34207364
Yes, I think it is. Is aluminum strong enough to make a rifle action with?

>>34207376
steel is harder to machine though.

some grades of steel are easy to weld on, at least.

>>34207380
>Polymer
You mean plastic. Wood is technically a polymer.

>>34207346
https://www.youtube.com/watch?v=zbUPjHHml1E

>>34207397
Don't be fucking autistic

>>34207397
Polymer has literally always been short hand for synthetic polymer you dumb twat

>>34207397
wood also has some plastic properties.

>>34208037
wooden gun frames when?

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>>34207385
Durability will be lower.

The CZ P-01 has an aluminum frame, AR's often do too if I recall correctly

>>34208251
7075-T6 is the milspec material for AR receivers.

Aluminum frames are very prone to stress fractures.
With that you will also need to order different cutters to work on Aluminum if you are used to running steel parts. The cutters will last longer but aluminum frames offer no real advantage over a polymer frame in terms of weigjt and durability

>>34208005
Stop using polymer as a euphemism for plastic.

>>34208251
Ar's use a steel barrel extension and a steel buffer tube.

>>34208282
Stop being an autistic faggot

>>34207397
oh my god fuck off you pedantic little shit

>>34208067
some autist made an AR lower out of a 2x4 to meme out about how LE GUNS R LE FREE LOL but I don't think he ever actually tried to use it

i dont have the image on hand but i remember it being pretty shoddily made

i wouldnt trust wood for anything that has to take high heat since it'd probably burn and lose shape on the inside unevenly but an AR lower is basically not even part of the receiver so you could make one out of tin foil if you really wanted, it's really all the upper that has any moving parts of requirements for heat or movement

>>34208362
buffer tubes are typically 7075-T6

The Bersa Thunder 380s are aluminum framed. The durability suffers and the finish is bad.

>>34207346
the glock 17 has an internal aluminum frame.

>>34207346
A) They do.

B) Polymer is lighter and chearper

C) They really don't work that well in the long run.

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Correct if I'm wrong but the two of the three best 9mm handguns of all time are on an aluminum frame(Beretta 92,Sig 226,Glock 17). I personally went with a Beretta 92fs and I love it. 3000 rounds through it with no FTF's. Aluminum is where it's at and won't bend when it's hot.

>>34207397

Nigga please

>>34207397
nylon 6 and nylon 66 are polymers faggot

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>>34208170

S-N diagramssss
>tfw when fracture failure fatigue final this week

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*Aluminium

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>>34207397
>tfw no wood frame 1911 for the ultimate fudd experience

>>34207346
all of the reasons given so far have been good answers, but the primary reason why we don't make aluminum frames anymore is due to aluminum being really hard to pronounce. It made it really difficult to order materials

>>34208706
>no browning hi-power
I'm insulted famalam

>>34209102
Good luck, just had my mechanics of materials final, thought I handed in a turd, somehow got a B

There are a bunch
-Beretta 92
-CZ P-01
-some CZ clones
-bunch of 1911s
-postwar Walther P38 / P1
-Boberg XR9
-Remington R51
-Chiappa Rhino

can't think of any more right now. Plenty of rifles as well

>>34207397
>tfw no frame made of literal human DNA

>>34207346
Because if you drop it its broken forever

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>>34209117
Ask, and ye shall receive.

>>34208282
Plastic is a property of a material, calling it a polymer is far from wrong.

>>34207346
Ar 15? Ar 10?

>>34207397
In an engineering sense, wood is a composite because of its structure. It's only a polymer in a biochemical sense.

>>34208170
For people that don't know what this is, its about the Fatigue Limit of materials.

Cyclic stresses can cause fatigue failure in materials, even if those stresses are below the actual strength of the material. In steels/iron alloys and titanium alloys, the stresses have to be above a minimum level to cause fatigue. If the stresses are lower, you can cycle forever without failure. Aluminum and copper alloys don't have that limit, so even a tiny stress loading can cause failure given enough cycles.

Not sure it's a problem given the operational lifespans of the average rifles though, but I'm sure someone can correct me on that.

>>34208005
Stop repeating marketing lingo
>>34208025
So has plastic you fucking mong
>>34210538
It points you out as a retard in this context, though.
>>34210695
And yet you probably call a fiber or metal reinforced plastic frame 'polymer' instead of 'composite'.
>>34209080
Normal people outside of the retarded gun community would just call it nylon or plastic

>>34210772
How high did you have to be to think that bullshit up?

My model 60 has an AL receiver and it's still going strong at almost 30yo and with tens of thousands of rounds thru it.

>>34210466

I want one that shoots low pressure wooden or plastic bullets

>>34207397
Cellulose is a polymer
Wood is a composite structure. It has a lot of components, not all of which are polymers.

>>34207346

Because Polymer is stronger than aluminum for pistol frames and magazines.

...but if you put it on the lower receiver of a rifle you have people immediately trying to deliver aluminum replacements.

>>34207380
>need
BILL OF FUCKING RIGHTS

>>34210695
>>34211569
Wrong. Cellulose and lignin - the defining components of wood per ASCE - are both polymers therefore wood is a composite polymer.

>>34207346
Because generally speaking if it doesn't need steel, it's probably easier over the long run to injection mold plastic.

>>34207386
No, it isnt. Aluminum is gummy as shit, doesnt make a good chip, threading aluminum sucks because the only way to get any level of strength is roll forming them.

I would rather machine steel, cast iron, brass, or even aluminum bronze over fucking aluminum. Stainless steel really sucks as well.

t. Machinist

>>34207376
Steel is much cheaper than aluminum.

>>34211940
There aren't any good aluminum alloys or stainless steels? Also, what do you think of zirconium copper? I was reading through the federal regulations and zirconium copper is missing from the list of materials that can constitute an armor piercing projectile.

>>34211511
You could probably make one that runs off of CO2 cartridges.

>>34212406
There are very good aluminum alloys as well as stainless steels. The anon said aluminum is easier to machine which i can tell you is false.

I've never had to work with zirconium copper, i know nothing about it.

>>34211148
He's not entirely wrong except for the last part about how any amount of stress causes aluminum to fail.

What he's talking about is a materials cyclic, elastic and ultimate strength. A materials elastic strength is it's ability to bend and absorb stress before returning to form, but as it wears, this limit goes down thanks to work hardening. The metal basically slowly becomes heat treated. In the vast majority of cases, this doesn't matter if it's accounted for when designing the product. Ultimate strength is a metals breaking point and where the gap between a part simply bending to actually failing by cracking, is crossed.

And no, aluminum does have a sort of cyclic barrier, all metals do depending in the alloy and heat treatment. You will never see 2024 or some fucking odd ball aluminum alloy ever used though. You strictly only see 6065 or 7075 because it's stronger than you'll ever need it to be. In fact, because of how aluminum reacts to heat treatment, it tends to have a fantastic cyclic life, what with it being used in everything from car pistons to missile parts, when forged, like all aluminum gun parts are.

Dude is probably high as a kite for pulling that bullshit out of his ass.

>Mechanical Engineer

>>34213202
>mechanical engineer

QUIT PUTTING .005" Tolerances ON CLEARANCE SURFACES.

>>34212406
Certain ceramics would work very well for armour penetration. Just use a plastic sabot to not destroy your barrel.

>>34213278
A lot of the time, Engineering Departments just use blanket tolerances, lol.
>Cast iron surface
>5 thou tolerance
>LMAO

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>>34208706
92FS is indeed aluminum frame.

>>34209117
I mean if you vacuum resin impregnated a particularly strong wood, it could probably be done.

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>>34208037
>>34208067
>>34207397
>celluloid gun frame
>Pull trigger, Gun goes up in a cloud of smoke!
For those not in the know, Celluloid is a highly flammable "plastic" made from nitrocellulose(gun cotton).
This material while very pleasant to handle in, at least in a fountain pen, is extremely flammable.

>>34207397
And chitin is literally polymer. How cheap would it be to melt bugs into pistol frames?

>>34211940
Ever machine copper?
Shits even worse.

>>34207346
Metal fatigue.

>>34211511
>polymer bullets

>>34213733
>Bugs
Mushrooms would be a much easier source for chitin.

>>34213733
>>34215572
Let's split the difference and make a pistol frame out of dried shiitake and shellac.

>>34213278
Think of it as a way to jack the price up on their part. Tight tolerances require more work.

>>34208679
>steel frame rails
>steel locking block
>steel slide
>steel barrel

Hurr durr

>>34213278
>QUIT PUTTING .005" Tolerances ON CLEARANCE SURFACES.

Nu-uh.

I'm going to go model a lump in CATIA, throw a 0.030" profile tolerance on all surfaces with no datum scheme and call it a day.