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Roller-Delayed Blowback Concept

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Author: Meerkoos

Group: Default

Filesize: 19.35 kB

Date added: 2014-12-09

Rating: 5.6

Downloads: 1985

Views: 311

Comments: 5

Ratings: 2

Times favored: 0

Made with: Algodoo v2.1.0


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This is a demo of a true roller-delayed blowback mechanism. It is consistent, reliable and does actually delay bolt thrust! It does not include firing pin and spring. Took me some time to stabilise it.

To test it, drag the bolt face to notice the delay and force needed to unlock the bolt.

You may use this demo, but please mention "Meerkoos". Thank you.
Last edited at 2014/12/11 21:57:11 by Meerkoos
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Yeah, I've also used a roller interruptor in my a2000. This one seems to lock the bolt slightly, but I'm not sure if it delays the action. If you give it a quick tug, then it won't delay it, and also maybe bullets would fail to move the bolt most times because of the lock.
I was thinking that this would be AWESOME for a bolt lock in gas-operated guns. If you make the "roller sockets" perfectly semicircular, and you try to push the bolt, it won't move, but if you move the red part, it will move backwards
@The Linkage: I may have overpowered the recoil spring. This blowback mechanism works with mechanical disadvantage (rollers act as the short end of a lever), so the more potent the recoil spring is, the more force should be used in order to set the bolt free. I upped the spring tension to emphasise the delayed action. Also, you need to be careful with the drag tool. The default max force is always infinite, so the force applied on the point is proportional to the length of the drag line. Of course, if you give it a quick tug, it would unlock easily! It is like you applied a huge amount of force on the bolt face in a very short amount if time!

This is more or less based on the H&K G3 (check to out), so I think you misinterpreted my project. It is made for powerful rifle ammo.
Yeah, I know- but I needed 600000 Nm to move the bolt backwards, after that I needed only 200000 to keep it at the middle. So it's more of a weak bolt lock, and an interruptor at the same time
Last edited at 2014/12/09 19:12:30 by The Linkage
This is a very interesting and ingenious mechanism! But I don't fully understand how the blowback action forces the red colored component back. Is it simply the backward thrust of the spent cartridge case that pushes it back? If so, what does the case actually push against? It can't be the bolt (the dark gray component) because it is locked in place. Right? That's the part that I don't understand.

Anyhow, nice job on the mechanism! :tup:
@The Linkage I guess weak bolt lock=delayed unlocking.

@Xray Nothing new here. I based my design on the H&K G3 bolt. Because it is a blowback mechanism, pressure exerts on the bolt face (light grey). Only a very small portion of the energy produced by the case is transferred to the red locking piece via the roller (mechanical disadvantage). The rollers act as levers, pushing on the locking piece, retracting, and setting the bolt free. Thanks for the feedback though.