Your post make me think of John (Moses) Browning, who had 144 firearm patents to his name, most of them created using his fathers, man powered lathe from around the 1830. In the later years, Browning did plug in some power to his dad's old lathe from a steam engine.
Brownings single shoots rifles, all the Winchester lever action rifles, including model 1894, model 1900 pistol, the famed "model 1911" Colt 45 ACP pistol, the "potato digger" Colt machine gun as well as most of his inventions and patents, were eventually first churned out, using his fathers old and simple lathe.
If you have a chance, you can view this lathe, his various prototype guns, including the first "Model 1911", still in the "white", at the John Browning museum in Ogden, Utah.