Chapter 100 (1/2)

Pulling rifling by hand is really a hard work.

The quality of this manual wooden broaching machine made by Ferguson and the wood family is very good. At least when the slider is pulled, all transmission parts run stably, and the rotation of the barrel is also very stable, which is enough to show the good quality of this broaching machine.

This is a wooden broaching machine, not a real lathe made of steel. Generally speaking, this kind of thing made of wood will vibrate or even displace when it is running. But this broaching machine does not have this kind of situation, or it has, but it is extremely slight, which can't be seen by the naked eye.

No wonder, in order to maintain the stability of the broaching machine, the eight wooden feet of the broaching machine are buried in the ground

But even with such a stable broaching machine, it takes a lot of effort to really pull rifling.

For young kids like rabbit mouth and hard bone, pulling the slider twice in a row makes their arms weak. This thing is completely relying on the strength of the human body. It forcefully pulls the hook knife to cut a layer of steel from the inner wall of the barrel, and it also drives a three-stage deceleration device. Without enough strength, it can't pull the slider on the broaching machine.

For example, some of the adult men Ferguson asked for help showed their teeth that they needed a rest after pulling the slider four or five times in a row.

Stone bear also tried to pull a few times, sure enough, this work is not ordinary people can do.

Even in terms of the strength of the stone bear, he felt his arms start to ache after pulling for more than 20 times.

Fortunately, this first rifling didn't require much time, so the five or six men around the broaching machine spent a whole afternoon pulling out four rifles from the barrel.

Rifling is divided into yin and Yang rifling, male rifling is protruding, female rifling is concave.

The Yang rifling is produced in the process of pulling the Yin rifling.

Therefore, even if only four rifles are pulled out, it is actually equivalent to cutting down the inner wall of the whole barrel by about 0.15mm.

However, although it is very laborious, although it is a wooden broaching machine, it can process rifling with 0.15mm accuracy. This life in this era can only be described as ”beautiful”.

At least Lieutenant Ferguson was happy with the rifling.

You know, in this era, not to mention the accuracy of one tenth of a millimeter, even if it is doubled, it is also very good. Thanks to the craftsmanship of the old wood family, the quality of this broaching machine is really good.

”Boss, the rifling of this barrel is very good. It's the most beautiful rifling I've ever seen.” Lieutenant Ferguson said excitedly, holding the barrel.

Stone bear nodded, ”yes, the rifling of this barrel is really good, but the efficiency of this lathe is too low. Five or six of us worked hard all afternoon to make such a barrel. How many people would it take to make a barrel on a large scale? ”

This made old wood a little ashamed. Second lieutenant Ferguson also opened his mouth and didn't say anything to refute.