Chapter 217 (1/2)

Jean Agust was responsible for burning glass and blowing various experimental utensils. In addition to the proportion of raw materials, he was even clearer than the stone bear.

Brother Gai is responsible for burning lime. In this respect, Shixiong has no big advantage compared with him. The only advantage is the ratio of raw materials.

Anyway, these two things are left to them, and Shi Xiong is not worried that they will make any trouble. After all, these two things are not so difficult. As long as there are raw materials and people, it is almost impossible to do them wrong.

At the beginning, the stone bear had never smelted steel. Didn't he feel his way to smelt it?

As for Jack Williams and David Dean, they have more important things to do. They can't get involved in burning cement and glass.

Williams has made great progress in the research of all steel machine tools, and now all his mind is on this kind of all metal machine tools.

In fact, machine tools, like glass and cement, appeared very early. The earliest tree lathe appeared more than 2000 years ago, which can be said to be the rudiment of machine tool.

This kind of tree lathe is ugly, but it's really a tool to process things with the help of external force.

The main function of tree lathe is cutting. A platform composed of two logs is set up between two close trees. One log is fixed, and the other log is slightly thin and can not be moved, but can be rotated.

At this time, people will choose a tough branch from two big trees, and then tie the upper end of a rope to this branch. The rope will hang down and make two circles on the thin log. Finally, it will drop to the height close to the ground and pull a rope buckle. This kind of machine tool will be installed.

When working, the worker steps down on the rope buckle, and the rope drives the thin log to rotate. At the same time, he pulls down the tough branch at the upper end. Then the worker loosens his feet, and the tough branch will drive the rope to move upward, driving the thin log to rotate again.

The thin log is equipped with hard and sharp shells or stone knives. With the continuous rotation of the thin log, these shells or stone knives will cut the objects fixed on the fixed log, so as to complete the cutting of the objects.

This is a typical process of using manpower and branch elasticity as power to process objects.

You can take the fixed log as the bed of the machine tool, which is used to fix the workpiece; The thin log can be regarded as a work piece. The stone knife or shell can be regarded as a cutting tool. The rope is the transmission system. The worker's foot and the tough branch can be regarded as the power system.

This is the original tree lathe.

However, human beings are always developing, and lathe is also advancing with the times.

The tree lathe that has been used for N years can't always be hung on the tree, so in the middle ages, there was a ”pedal lathe” which used a pedal to rotate the wooden crankshaft and drive the wooden flywheel, and then drive it to the wooden spindle to make it rotate, also known as the elastic bar lathe, except that the cutting tool was replaced by a metal cutting tool, The operation principle is as like as two peas.

In 1395, the real rod machine tool appeared in Germany.