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File 15101848238.jpg - (2.41MB , 3024x4032 , IMG_20171108_153157.jpg )
105918 No. 105918 ID: 8c968b
Dunno if it's a dumb idea or not yet. But I was thinking about making an AEK style counterweight system for my 74 kit that I haven't gotten around to finishing. Here is some crappy drawings I did while at work. I'm feverishly measuring some parts right now for a real drawing. Don't have much stuff other than mics and calipers to do REAL measurements at home (no rock, no height gage, no gage blocks, etc.) but I'm confident I can kind of wing most of it except for a couple precision bores. But I can measure those later with some better stuff.
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>> No. 105919 ID: 19518e
File 151019376929.png - (140.95KB , 1577x597 , counter_recoil.png )
105919
I see nothing wrong conceptually, but you may want to design it a bit more simply. Making a thread on that outside part of the gas block might be a bit tricky because of the profile of the barrel clamp part of the gas block, you'll need to find a die that can get between those two surfaces. The front sight post will also be a bit of work to machine...

What about this?

Gas block is bore for barrel, top part for piston is counterbored on both sides with port in the middle. Front sight is bored. Put the counter recoil business inside of a suitable tube, install the whole thing by sliding the gas block into place.

Obviously I made this in a couple minutes with no real dimensions (made up every number) because tfw no AK.

You might want to make the counter recoil mass heavier, maybe mash some lead up its ass where the spring will be pushing. You'll have to find both a mass and a spring that will feel right, as getting either wrong will probably feel like an AR-15 recoil but instead of having the three thumps, you'll have like 5 or six.
>> No. 105920 ID: 19518e
File 151019441629.jpg - (339.47KB , 1199x1198 , wew lad.jpg )
105920
k the shenanigans I'm getting up to with this means it's bed time
>> No. 105921 ID: 8c968b
>>105919
Sorry. The picture is confusing. The thread is on the front gas tube, and a little collar thing. That way, I can screw the collar down to shorten the length of the tube for removal. The inside of the collar that mates with the block is chamfered and will have a matching chamfer on the block for centering the tube to the block. Thinking about this a second time though, makes me think this may be a flawed plan, since carbon would be let into the threads. And as I know from my zig zag brake, it can build up significantly.

The front will be a lot of machining. I pretty much accept that. I could have started with a raw forging that some US company made (or I guess just buy a made front sight gas block combo and make it work) but my autisms requires the proper muzzle threads and the proper look etc.

Yeah, I'm sure it will take a lot of work tuning. I know the forealz version has a long narrow weight with a rack cut into it, and a rack cut into the bolt carrier/piston and a tiny gear that ensures both recoil the same amount and the same speed. That sounds super hard though. Since it would require a lot of modification to the existing BCG design.
>> No. 105922 ID: 19518e
>>105921
>since carbon would be let into the threads. And as I know from my zig zag brake, it can build up significantly.
I see it now, and I think if you have a vent hole before the threads, it should keep the threads from being exposed to too much high pressure dirty gas.

>tuning
>original AEK
Yep, all that stuff in the AEK in the counter-recoil mass totals, I assume, to an equal mass as the total reciprocating mass in the action. It doesn't look like you'll be able to cram like half a pound in that counter-recoil mass, so you'll have to make it go faster to compensate, but that might make it feel funny.

You could set up a compound spring for the counter-recoil mass, and try to tune spring weights and port size while keeping counter-recoil mass constant, because you're not going to be putting that much weight into the counter recoil in the first place so I'd put in as much as I could and work on the other variables. You could probably straight up grab an old broken endmill shank that's the right size and use that as a counter-recoil mass, tungsten carbide is heavy and wouldn't get all play-dough inside a gun like a mass made entirely out of lead.
>> No. 105923 ID: 241b9d
>>105918
>I was thinking about making an AEK style counterweight system for my 74 kit that I haven't gotten around to finishing.

Is there even any point to this (outside being mechanically interesting of course) if the rifle isn't full auto?
>> No. 105925 ID: 19518e
>>105923
Counter-recoil is a way to reduce the recoil impulse by cancelling out the recoil caused by the reciprocating mass driven by gas. Normally competition shooters (and other kinds too but you know what I'm saying) will do this by simply reducing the mass of the reciprocating components and messing with cycling speed to try and retain reliability. Counter-recoil isn't my personal glass of spiders because it increases the total mass of the firearm, but it is a cool concept.

Obviously it doesn't change the recoil caused by the bullet and gas exiting the barrel, but that should go without saying. It's all about the other extra bumps and tugs when the clockwork is flopping about getting old cans out and new bottles in.
>> No. 105926 ID: 8c968b
>>105923
For me, it's just a machining exercise, and to make a gun have a reason to exist in my collection, since I have an AK74 already (with the triangle folder, unlike this kit, which is a fixed stock one).


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