The experience of digging a deep pit and planting wooden pillars allowed the eldest brother and others to personally experience the usefulness of the bone shovel.

When the Son of God said that he would continue to make bone shovels, everyone was very excited.

Despite this, the efficiency of bone shovel production has not been improved. The biggest problem is not the selection and grinding of bones, but drilling holes on the bone shovel for threading ropes to fix them.

The current method of drilling is to select hard rock, hit it, choose suitable thin slices from it, and process it again to make a pointed tool that can barely be called a stone drill.

Then he took the stone drill in his hand and started drilling holes in the solid bone.

Because the bone fragments were too hard and the stone drill was not sharp enough, the drilling process was extremely slow and difficult.

After drilling for a long time, the fingers holding the stone drill will become sore and the wrists will become extremely tired, so that even the strong eldest brother, the second eldest brother, and the leader of the original pig tribe, Shang, have to drill for a while and then rest for a while.

Under such circumstances, it is already very rare to drill two holes in a day.

Han Cheng was at a loss as to what to do about this situation. He also couldn't think of any good way to solve the current dilemma.

The problem was not solved until he suddenly remembered that when he was very young, a group of "bamboo craftsmen" came to the village and made bamboo beds, coffee tables, chairs and other things for some families in the village.

(A bamboo craftsman is a craftsman who specializes in making various tools with bamboo, such as carpenters, stonemasons, blacksmiths, and bricklayers.)

At that time, Han Cheng, like other children in the village, was extremely curious about this matter and often stood by to watch how they turned bamboo into various exquisite and practical tools.

Compared to other things, Han Cheng was more curious about the tools they used to drill holes in bamboo.

It is obviously just a simple rope, a piece of bamboo broken in half, and a long iron rod with a sharpened end and a ring on the other end. After putting them together, it becomes a hand drill that can be quickly rotated by just pressing the bamboo down.

Han Cheng can still remember the scene of bamboo craftsmen using this simple hand-operated drill to drill holes in bamboo.

After remembering this incident, Han Cheng, who was delighted, immediately started to make a primitive hand drill.

There is no iron rod at this time, but it can be replaced by other things.

Han Cheng found a sturdy wooden stick. The stick was not thick, only as thick as an adult's little finger.

The stick was about forty centimeters long and all the small branches on it had been cleared away.

Then he used a simple stone knife made in the tribe to split one end of the wooden stick about two or three centimeters along its diameter.

Of course, this distance is not fixed and needs to be determined based on the thickness and length of the upper part of the stone drill.

The thicker and longer the upper part of the stone drill is, the longer the cut that needs to be made will be. On the contrary, the thinner and shorter the upper part of the stone drill is, the shallower the cut that needs to be made will be.

After the cut at one end of the wooden stick is made, the next thing to do is to insert the upper part of the stone drill previously held in your hand into the broken cut, and after adjusting the position, tie it tightly with rope and straw.

Then use a stone knife to carve a groove about two or three millimeters deep in the middle of the top of the other end of the stick.

It should be noted that this is different from just now. Just now, one end of the wooden stick was split in the middle, but now a groove is carved to prevent it from being split.

In this way, the stone drill is ready. The drill rod is made of wood and the drill bit is the original stone drill.

After doing all this, find a piece of wooden stick about 30 cm long and 4 cm in diameter, and split it in the middle.

This is not difficult. Just place the wooden stick vertically on the ground, then place the blade of the stone knife against the middle of the top of the stick, and use your other hand to hold a piece of wood and hit the back of the stone knife.

As long as the stone knife is not tilted, the split wooden stick will generally not be tilted.

When striking a stone knife, wooden sticks are used instead of harder stones because the stones would collide and damage the stone knife, but this would not happen if softer wooden sticks were used.

Choose a piece of wood that has been split in half, and use a stone knife to thin the two ends of the wood so that it is easier to hold with your hands. At the same time, carve a circle of small grooves on both ends of the wood for tying ropes later.

After all these are done, find a piece of rope about one meter long made from three rope grasses, and stick the middle part of the rope into the groove of the drill rod head made previously.

Then turn the drill rod clockwise (or counterclockwise) twice so that the rope is wrapped around the upper part of the drill rod.

Then place the wood you just prepared on the ground, step on it firmly with your foot, place the drill bit in the center of the wood, and then hold one end of the rope with one hand and pull it outward.

Because the rope was previously wrapped around the drill rod, if it is pulled apart now, the drill rod will also spin due to inertia, and at a very fast speed.

In this way, after the rope is pulled and the drill rod stops, the rope will be wrapped around the drill rod again in the opposite direction due to inertia.

Then pull the rope again and the drill rod will continue to rotate, repeating the previous action.

The magical thing that the drill rod would rotate by itself and drill a hole in the wood below without rubbing it with hands attracted everyone in the Qingque tribe to marvel.

They all stopped what they were doing and gathered around to watch in wonder.

The elders of the Green Bird Tribe were better off, because they had seen the magic of the Son of God many times. However, those from the Original Pig Tribe who had joined the Green Bird Tribe for less than a month, all stared with their eyes wide open in surprise, watching this incredible scene, and marveled at the intelligence of the Son of God.

It is true that you can drill things by pulling a rope with your hands, but this also has its disadvantages. That is, the drill rod is easily unstable due to the force during drilling, and the consequence is that the drilled hole is easily deviated.

Another impact is that if you pull for a long time, your fingers will be hurt by the rope.

That's why the piece of wood that was previously made appeared.

Han Cheng removed the rope from the drill rod, then passed the drill rod through the wooden board with a hole in it, placed the wooden board about one-third of the way down the drill rod, and tied both ends with ropes.

Of course, the middle of the rope is still stuck in the groove on the upper part of the drill pipe.

After it is fixed, a real hand drill is ready.

When using it, just like when you pulled it by hand before, first turn the drill rod twice, then place the drill bit against the place where you need to drill a hole, hold both ends of the wood with both hands and press down, the rope wrapped around the drill rod will loosen, and then drive the drill rod to rotate.

In this way, a real hand drill appeared. Although the drill bit and drill rod are simple enough, it is undeniable that this is truly a traditional hand drill.

(The third chapter is here. Comrades, please give me a few recommendation votes after reading it. Don’t be polite. Be ruthless. Haha)