Xu Wen didn't speak, and Lu Yuan continued.

He is only rough now, making the rough shape of the mortise and tenon joint, and then he will do it finely.

He made the most common dovetail and used it in many places.

This structure requires a certain amount of waterproof performance, but it is not too strict, according to the standards set by experts, the waterproof level can reach level 2.

Xu Wen watched him do it from the side, his brows furrowed more and more, and finally turned into deep doubt.

Lu Yuan finished the shape and began to polish it.

He took out a bale of hay from the box next to him, untied it, put a dozen of them in warm water, and began to soak them.

"What is this?" Rong Xian asked curiously.

"Grass, for grinding wood. Lu Lihai replied.

"Grinding with grass?" Rong Xian was even more curious.

Lu Lihai couldn't speak clearly with his mouth, so he directly took one and showed it to Rong Xian: "Look, are there a lot of small grains on the surface? ”

The gangue grass is the horsetail grass, and the carpenters in the class world often use this polishing, but I didn't expect that the class gate construction team still uses this.

"Isn't this similar to sandpaper? Why don't you use sandpaper to use this?" Rong Xian also thought of this.

"Hmm...... The sandpaper is a bit coarse and does not fit. Lu Lihai hesitated.

"There are also fine ones, I used them when I was making model airplanes. ”

"Hmm...... This is all the method of the ancestors, and it must make sense to pass it down, and it is really easy to use. ”

"Oh......"

Rong Xian didn't continue to ask, and looked at it over and over with the horsetail grass, while Xu Wen was a little thoughtful.

When he was polishing in the class gate world, he often thought that it would be good to go back to modern times, there were all kinds of sandpaper to choose from, which was much more convenient than horsetail grass and rough leaves.

As a result, Lu Lihai is still using the old stuff now?

Is it better to be true or something old...... Looks like we'll have to try it out for ourselves.

But that's for later, and now the focus is still on Lu Yuan's own craftsmanship.

That's how it works......

In order to make it easier to carry, the equisetum grass prepared by Lu Lihai is dry and must be soaked in water before it can be used.

During this time, Lu Yuan was dipping a towel in water and wetting the wood little by little. When the wood fibers swell when exposed to water, they produce some fine burrs, and when these burrs are removed, the surface will be smoother and more delicate.

At the same time, he also prepared another thing - fish maw gum.

In the class world, when Xu Wen went through the apprenticeship test, the first and third rounds of the examination used mortise and tenon structure, but neither fish bladder glue was used.

This is because the apprentice test is the basic skill, that is, the apprentice makes the fine work of scraping and grinding. Whether the surface is flat or not, whether the seams are traceless, these are hard work.

The auxiliary tool of fish maw glue is not provided by the examiner and is not allowed to be used.

However, when carpenters make mortise and tenon joints, fish maw glue is actually a necessary material, and it is also an auxiliary tool that can really ensure that it can be waterproof and firm.

Fish maw gum is a natural organic material with good plasticity and elasticity. After it is fully boiled, it is filled into the joints of the mortise and tenon joint, and will expand or compress with the contraction and expansion of the mortise and tenon wood itself, which is equivalent to the ligaments in the joints of human bones, and plays a buffering role in the external cold, hot, dry and warm pressure.

Boiling the fish maw is also the carpenter's own craft, Lu Li's kelp tools are very complete, Lu Yuan boiled it step by step, and he can see it very clearly.

Xu Wen had been sitting next to him, leaning forward and watching intently.

When he saw this, he leaned back, leaned back in his chair, and exhaled softly.

"It's a bit complicated, so many processes. ”

An hour later, Rong Xian was speechless.

"It's pretty simple. Fir is softwood and is easy to handle. Replaced with a hardwood like mahogany, and the water grinding kung fu...... That's really a drop of water to wear. Lu Lihai looked at his son with satisfaction and said with a smile.

"Do you have a pen and paper?" At this time, Xu Wen suddenly turned around and asked Rong Xian.

Rong Xian was stunned for a moment, and hurriedly called someone to prepare.

"What are you going to write, great god, and what kind of master's secret?" Rong Xian asked excitedly.

"Why do you ask?" asked Xu Wen curiously.

"Because of your expression. Rong Xian gestured to his eyebrows, "I kept frowning, looking very dissatisfied." ”

Lu Lihai kept looking at his son, and he didn't pay attention to Xu Wen's expression at all. Hearing this, he turned his head to look at Xu Wen in surprise.

Xu Wen didn't expect that Rong Xian seemed to be watching Lu Yuan do his work intently, and occasionally talked to Lu Lihai, and even saw his own expression clearly.

But since he asked, he had nothing to hide.

"Well, I think there are some things that can be improved, and I'm going to write them down. He nodded.

"Some of the techniques of our class are different from other families, you may look a little weird, but our family has been compared with others, and the effect is actually better!"

Lu Lihai always knew that Xu Wen didn't know how to work as a carpenter, thinking that he was comparing it with other jobs he had seen before, so he hurriedly explained.

There was a slight disapproval in his expression, Xu Wen saw it, but he didn't say anything, just said, "It's not that...... I'll finish writing it in a moment, and you'll see it later. ”

"Oh......" Lu Lihai was a little uneasy and looked at Rong Xian.

Rong Xian was obviously inspired by the word "secret" he said, and while urging his subordinates to hurry up and bring a pen and paper, he pestered Xu Wen to ask Lu Yuan what he was not doing, if he could reveal it to him first.

"Why did Master Lu let the others back away just now?" Xu asked him.

"Because it's a unique school, a daughter-in-law is not a daughter?" Rong Xian immediately understood, and then he asked excitedly, "Then how about I worship you as a teacher, can you show me?"

He quickly bowed his hand to Xu Wen and shouted, "Master!"

The tone and tone are exactly the same as when Sun Wukong called Tang Seng in Journey to the West.

"How can it be so simple, our carpenter apprenticeship apprenticeship, first have a half-year test period, half a year to fetch water and chop wood, pour foot washing water for the master, and the master will let you do whatever you want. Half a year later, Master thinks that you have a good character and a good mind, so he will accept you as a beginner and teach you the craft. Xu Wen told him with a smile.

"Half a year??So troublesome!"

"That's right. And internships are not easy to do. Generally, there will be an introducer carrying the door of the master at the festival to ask for help, and there will be a banquet after worshipping the master, which is very grand. ”

Rong Xian fell into deep thought after hearing this, and Lu Lihai looked at Xu Wen in surprise.

Although these things are very basic, they will not be known if they have not specifically understood the industry.

The most important thing is that the rules of apprenticeship of craftsmen around the world are actually a little different, and what Xu Wen said is the old rules of their class!

"That was before. At that time, there were many apprentices and few masters, and if you worship the master and learn the arts, you will be considered to get ahead, of course, it will be grand. Right now...... There are fewer apprentices, and even fewer good apprentices. Lu Lihai said with a sigh.

"That's it, it's hard to find an apprentice like me, so the master will accept me as an apprentice!" Rong Xian became excited again and shouted.

"Shhhh......h

Rong Xian was very well-behaved, and his voice quickly became smaller, but he still pestered Xu Wen.

At this time, the people of Rong Mansion sent paper and pencils, and at the same time, Lu Yuan's first mortise and tenon joint was also completed!