said that the locking principle of MG42 is not much the same as that of MG34, it is still the past to regard MG42 as a product of MG34 to simplify production. The MG42 also has a simplified version of the general machine, MG45, or MG42V, which uses the same roller type semi-free camera as the later G3, but it was not equipped in the end. This dog will talk to everyone. it.
In 1944, following the defeat of the German army after the defeat of the Battle of Kursk, coupled with the Allied forces have landed in Italy, the material resources of Nazi Germany began to tighten. Although the production cost of MG42 has been reduced from 327 Reichsmark of MG34 to 250 Reichsmark, Germany still wants to continue to simplify it on this basis to facilitate rapid production and supply frontline. How to simplify
? The MG42 is a machine gun with a short recoil + roller lock principle. In 1943, Ludwig Vogrimler of the Mauser Factory was thinking about the possibility of using rollers directly to delay unlocking. The mechanism behind the barrel is omitted, and the gun parts can be reduced and even more accurate. But delayed unlocking is a very complicated mathematical problem. By December 1943, the mathematician Dr. Karl Meyer made a mathematical model of roller delayed unlocking. By January 1944, Vogriml Column delay semi-free bolt action design machine gun, this is the development background of MG42V.
Roller Delayed Locking Principle I think the brothers who read my article should be familiar with it. If you follow the picture below:
A: In the locked state, the blue roller is pushed open by the red firing pin set slope when it is reset, and gets stuck. The two grooves of the sleeve are similar to the bolts of the door. But this is not a rigid lock, you just think, whose door has a round tongue, can it be opened without a little force?
B: After the bullet is fired, recoil is generated, and the bolt is pushed backwards desperately. This roller has to be locked when the chamber pressure is the highest, but also needs to be squeezed into the bolt to unlock the lock at about the same time, so I said this is a one Very troublesome math problem.
C: The two rollers retracted into the bolt to complete the unlocking. The recoil pushed the bolt to recoil
. Therefore, the biggest difference between MG45 and MG42 is that the barrel does not need to be recoiled, and it can be directly connected to the sleeve. The rear part of the barrel is also saved. Of course, because the barrel does not require recoil, the original MG42 muzzle used to accelerate the recoil of the barrel is gone.
In order to minimize the changes in the production line, the MG45 is different from the MG42 only in the barrel section and the re-entry spring part, and the rest such as the receiver, barrel cover, trigger unit, butt stock, etc. are all MG42 originals.
Of course, because the MG45 is not a rigid lock, the weight of the bolt has been increased from 550 grams of the MG42 to 845 grams, but even so, its rate of fire is still too high. There are two theories. One is that "Waffen und Geheimwaffen des deutschen Heeres 1933–1945" (1939-1945 German secret weapon) mentioned that it has a rate of fire of up to 1,800 rounds per minute, and the other is that the Mauser factory When it was tested, the rate of fire was 1350 rounds per minute, but in any case, this rate of fire is too nonsense and can barely be accepted on a tripod, but if it is a bipod, the gun will be pushed by the recoil at high rate of fire. Shaking, the hit rate is touching.
In June 1944, the German army tested the weapon, but it was far from service. However, the delayed locking of the rollers gave StG45 inspiration, including the Spanish CETME after the war, SIG’s MG710, Rheinmetall’s MG60, etc.
. The picture shows MG710-1
. According to the data given on the wiki, MG45 was produced in total. I used 10 of them for testing, and then there was no more. I thought that the roller semi-free gun itself was a difficult math problem and required a lot of experimentation and calculation. At that time, Germany was dying, and there was no such effort. Moreover, the gun of this principle is difficult to extract the shell after the shell is launched, so the later G3 has grooves in the shell to facilitate the gas to rush into the gap between the shell and the shell to avoid excessive shell expansion and cause the shell failure. It is unknown whether MG45 has grooves or not. The two designers have their own opinions. According to my understanding, they may not have been in the early stage, but they also realized and realized before the end of World War II.solved this problem.
