What did Lu Ban invent?

Lu Ban invented Lu Banchi, stone mill, Mo Dou, planer, shovel, chisel, key, saw, pavilion and so on.

The story of Lu Ban inventing the saw.

On one occasion, the king ordered Luban to cut down 300 beams and columns in fifteen days to build a big palace. So, Lu Ban took his disciples up the mountain. They got up early and were greedy for the dark, wielding axes and chopping for ten days in a row. They were exhausted one by one, and only one hundred big trees were cut down.

At this time, all the bricks and stones are ready, and the auspicious day chosen by the king is about to expire. If the wood is not properly prepared during construction, it will be put to death. What shall we do? At night, Ruban tossed and turned in bed and couldn't sleep. He got up and walked towards the mountain with a deep foot and a shallow foot. Looking up, the seven stars blinked at him, and it was almost dawn.

Suddenly, Luban felt that his hand was cut by something. When he raised his hand, he saw a hole in his calloused hand, oozing blood beads. He looked around carefully, and it turned out to be thatched grass. Ruban was surprised. He picked up a blade of grass and found many sharp teeth on its edge. Turning around, he saw a big locust with two big ears eating grass quickly. Luban caught a locust, and when he saw it, its teeth grew well. Look at the leaves of silk grass and the big die of locust, and his heart will be suddenly enlightened. He made a bamboo out of Phyllostachys pubescens, which was carved with many serrations like silk grass leaves and locusts. Pull the tree with it, only a few times, the bark will be broken, and once again, there will be a deep ditch on the trunk. But after a long time, the sawtooth on the bamboo piece is either pure or broken. At this time, Lu Ban thought of iron. He ran down the mountain and asked the blacksmith to make a serrated iron bar based on the bamboo pieces he made, which was used to pull the tree. Really fast!

This iron bar is the prototype of a saw. With it, Luban and his disciples cut down 300 beams and columns in 13 days.