eli5 Why weren’t machine guns possible to make in the past?

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What stopped 18-19th century armies with guns from being able to create automatic weapons like AK-47s and Uzis?
Since they don’t use electricity I feel like they’re made with materials and technology that was already available in the 1750s, surely they could’ve put their heads together to create a machine gun and just annihilate any ops…

Thanks

In: Engineering

35 Answers

Anonymous 0 Comments

Self contained cartridges were needed to have machine guns that could reliably feed from a magazine or belt. To have self contained cartridges it requires machining hundreds of thousands or millions of cartridges to exacting specifications (off by fraction of millimeter = explosion). Once machining advanced to the point where cartridges and weapons could reliably be manufactured, automatic weapons followed very shortly.

Anonymous 0 Comments

No automatic gun has been made which did not use parts made on a lathe, and the all metal lathe was literally *just* invented in 1751, and it took many more years before it was a common tool.

Anonymous 0 Comments

Yeah, basically they were all really stupid. If only you had been around to explain to them how stupid they are then we’d all be living on Mars

Anonymous 0 Comments

Three things, mostly:

1. What precision machine tools existed in that time period were very rare and expensive and also just not all that precise.
2. Poor materials science meant that metals were more brittle or just plain weaker and couldn’t handle the high thermal/stress load.
3. It was difficult to mass manufacture parts and especially ammunition – the first cartridge was invented at the turn of the 19th century but even then it was paper and couldn’t be manufactured in bulk like brass cartridges can be.

Anonymous 0 Comments

>they’re made with materials and technology that was already available in the 1750s

That’s the thing. The manufacturing technology wasn’t there at the time. The rifle cartridge hadn’t been invented and wasn’t possible at the time, and the capability to make guns with the tolerances, materials, and durability to withstand operating conditions didn’t exist.