Chapter 101: Bamboo craftsman and hand drill

　　 This experience of digging deep pits and planting wooden pillars allowed the seniors and others to personally experience the usefulness of bone shovel.
　　 When the child said that he would continue to make bone shovel, all of them were very energetic.
　　 Despite this, the efficiency of bone spatula production has never been improved. The biggest problem is not the selection and grinding of bones, but the holes drilled in the bone spatula for fixing the rope.
　　The current method of drilling is to select a hard rock, strike it, select a suitable slice from it, and reprocess it to make a sharp, barely called stone drill tool.
　　 Then he took the stone drill in his hand and started drilling holes in the solid bone.
　　Because the bone fragments are too hard, and the stone drills are not sharp and sharp enough, the drilling process is extremely slow and extremely laborious.
Drilling for a long time, the fingers of the stone drill will become sore, and the wrist will become extremely tired, so that even the strong senior brother, the second senior brother, and the leader of the original pig tribe have to drill on it. For a while, rest for a while.
　　Under such circumstances, it is very rare to drill two holes a day.
　　 For this situation, Han Cheng was also helpless. He also couldn't think of any good way to solve the current dilemma.
　　 It wasn't until he suddenly remembered that when he was very young, when a group of "bamboo craftsmen" came from Murakami to make bamboo beds, coffee tables, and chairs for some people in Murakami, this problem was solved.
　　 (Bamboo craftsmen are craftsmen who specialize in making various tools from bamboo, similar to carpenters, stonemasons, blacksmiths, and masons.)
　　 At that time, Han Cheng, like the other children in Murakami, was extremely curious about this matter. He often stood by and watched how they turned bamboo sticks into various beautiful and practical utensils.
　　 Compared to others, Han Cheng was more curious about the tools they drilled for bamboo.
Obviously it is just a simple rope, a piece of bamboo that has been torn in half, plus a long iron rod with one end sharpened and the other end circled with a ring. After putting them together, It becomes a hand-pressed drill that can be turned quickly by simply pressing the bamboo down.
　　Bamboo craftsmen used this simple hand drill to make holes in the bamboo, Han Cheng still remembers.
　　 After remembering this incident, Han Cheng, who was happy in his heart, immediately began to make the original hand-pressed drill.
　　 There is no iron rod at this time, but other things can be used instead.
　　 Han Cheng found a strong wooden stick, the stick is not thick, only the thickness of an adult's pinky.
　　 This wooden stick is about forty centimeters long, and some small branches on it have been cleaned up.
　　 Then I used a simple stone knife made in the tribe to split one end of the wooden stick along the diameter for about two to three centimeters.
　　 Of course, this distance is not fixed, it needs to be determined according to the thickness and length of the upper part of the stone drill.
　　 The thicker and longer the upper part of the stone drill, the longer the opening that needs to be split. On the contrary, the thinner and short the upper part of the stone drill, the shallower the opening that needs to be split.
　　 After the cut at one end of the wooden stick is cut, the next thing to do is to insert the upper part of the stone drill previously held in the hand into the broken hole, adjust the position, and tie it firmly with rope.
　　 Then use a stone knife to carve a groove about two to 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 the previous one. It was only when one end of the wooden stick was split from the middle, but now it is carved out a groove to prevent it from splitting.
　　 In this way, the stone drill is completed, the drill rod is wood, and the drill bit is the original stone drill.
　　 After doing this, find a wooden stick about 30 cm long and 4 cm in diameter, and split it from the middle.
　　 It’s not difficult. Just put the wooden stick on the ground upright, then put the blade of the stone knife in the middle of the upper end of the wooden stick, and hit the back of the stone knife with a piece of wooden stick in the other hand.
　　 As long as the stone knife is not tilted, the generally split wooden stick will not be tilted.
When hitting a stone knife, the reason why a wooden stick is used instead of a harder stone is because the stones collide with each other and the stone knife will be damaged. If you use many soft wooden sticks to hit it, this will not happen. Things.
Choose half of the wood to be split, use a stone knife to narrow the two ends of the wood, hold it with your hand, and at the same time, carve a circle of small grooves on both ends of the wood for later tying the rope use.
　　 After all these are done, find a piece of rope about one meter long and twisted with three pieces of rope. The middle part of the rope is stuck in the groove of the drill pipe head that was made before.
　　 Then turn the drill rod twice clockwise (counterclockwise is also OK) so that the rope will wrap around the upper part of the drill rod.
　　 Then put the wood just finished on the ground, step on it firmly with your foot, put the drill bit against the center of the wood, and then pull the end of the rope together with one hand.
　　Because the rope was entangled on the drill pipe before, if you pull it away now, relying on inertia, the drill pipe will turn around, and the speed is still very fast.
　　 After pulling apart the rope and the drill rod stops, relying on inertia, the rope will be wound on the drill rod again in the opposite direction.
　　 Then pull the rope again, the drill rod will continue to rotate, repeat the previous action.
　　This way, without rubbing your hands~EbookFREE.me~ the drill rod will rotate by itself and drill a hole out of the wood below, which aroused the surprise of everyone in the Qingque tribe.
　　 They all stopped their movements and looked around their bodies.
The old people of the Qingque tribe are better, because they have seen more of the magic of the gods. Those who have only joined the Qingque tribe in the original pig tribe for less than a month, all of them stared in surprise, watching this incredible scene , I was amazed by the ingenuity of the son of God.
　　 Relying on the rope by hand, it is indeed possible to drill things, but this also has disadvantages, that is, the drill rod is easy to be unstable due to the force when drilling, and the consequence is that the drilled hole is easy to deviate.
　　 Another effect is that if you pull it for a long time, your fingers will become sore by the rope.
　　 Only the previously made wood will appear.
Han Cheng removed the rope from the drill pipe, and then passed the drill pipe through the wooden board where the holes were drilled. Then, he placed the wooden board about one-third of the bottom of the drill pipe and tied the two with the rope. end.
　　 Of course, the middle of the rope is still stuck in the groove on the upper part of the drill pipe.
After 　　 is fixed, a real hand drill is completed.
When using it, as before with the hand, turn the drill rod twice, then put the drill bit against the place where you need to drill, hold both ends of the wood with both hands and press down, the rope wrapped around the drill rod is just It will loosen, and then drive the drill pipe into a circle.
　　In this way, a true hand drill has appeared. Although the drill bit and drill rod are simple enough, it is undeniable that this is truly a traditional hand drill.
　　 (Chapter 3 is delivered. Please also comrades after reading it and throw me a few recommendation tickets by the way. Don’t be polite, you must be ruthless, haha)