After the sole was cut out, Wang Tian made a meticulous cut with a saber to make both sides of the sole smooth, and then compared to the sole of his foot, he determined the position of the three fixing points of the flip-flop.

Then take out the hand drill hole, in a similar position, drill three finished glyph arranged holes at each of the three fixed points, this must be operated carefully, can not be drilled through, otherwise the water on the ground can penetrate through the straw rope.

Then, with a knife on a saber, connect these three holes together for reaming to get a large hole.

Finally, the three straw rope fixing holes are reamed, and after the straw rope installation hole is drilled, Wang Tian takes the rope grass and begins to weave the straw rope of the flip-flops.

Determine the thickness to be knitted, and then make the desired length, and finally get two herringbone straw ropes, respectively, the three straw rope heads are dipped in fish maw glue, put into the three fixed holes and paste firmly.

Then take some vegetable pine resin, heat it to fill the gaps of the fixed holes, the pine resin can play a role in waterproofing, and can avoid direct contact between the fish maw glue and the water.

Now you just need to put it aside to dry, and when the maw glue is completely dry, the herringbone rope and the wood of the sole are fused into one, and the flip-flops are ready to be worn.

As for how strong the upper and sole of the shoe are glued with fish maw glue, this needs to be used before the answer can be obtained.

Flip-flops alone are not useful, Wang Tian's original intention is to make shoes that can keep warm and wear in winter, Wang Ting had to pick up another pair of soles, staring at them, while carefully thinking about how to do it to be waterproof and durable.

He took the sole of his shoe and looked at it over and over again, which reminded him of the wool slippers of later generations, that is, the real slippers in the indoor room in winter.

In later generations, almost every family had the kind of wool slippers that were pasted with tiles or wooden floors at home, and they would be replaced as soon as they returned home, and most of them were crocheted by the women of the family.

Wang Tian still knows the manufacturing process of this kind of shoes, and bought a batch of rubber soles from the wholesale market, some of which have nylon threads on the rubber soles, and some of them do not.

When making it, Wang Tian remembered that it seemed that women first used the method of knitting sweaters to make an insole smaller than the sole, and then used the elasticity of the wool to stretch and fix the insole on the sole with a crochet needle.

Make the insole as wide as the sole, and then knit the upper with crochet or woolen thread to fix the woven upper and sole into a single piece.

Can you refer to this structure yourself? In the primitive era, the most difficult thing to do shoes is the waterproof problem, the only glue at this stage is the fish maw glue, the most obvious feature is that it is not waterproof, if it is soaked in water for too long, the fish maw glue will automatically dissolve.

How do you break this? Wang Tian remembered the stall that mended shoes in the market in later generations. When facing those shoes that have been degummed and derooted, the method of repairing them is to use a sharp blade to cut from the side in the middle of the side height of the sole.

Then the deglued upper is repaired with nylon rope, the cut from the side is crocheted with a crochet needle, and finally glued with glue and the side of the cut heel is pasted to restore it, so that the degummed upper is "rooted" with the sole again.

There is no need to drill through the entire sole, so as to ensure that the rain will not penetrate from the sole and rope holes, which plays a waterproof role.

In primitive societies, there was no rubber, and it would be impossible to fix the upper in the same way as a shoe, but this method can be used for reference.

In order to achieve the waterproof effect, you can only increase the heel and sole, and it seems that you have to make a pair of heightened shoes.

A pair of soles that I just made can now only be used as the sole of a shoe, which is split in two by an axe from the middle, and a hand drill is used to drill a circle of threading holes along the contour of the shoe on the upper sole, and thread the thread on it, and use a crochet needle to connect the beveled animal skin with the thread that has been worn.

Because the thread made of hemp yarn is not very strong, the threading holes need to be drilled densely, so that the fixing points between the lean leather upper and the sole are as many as possible to increase the firmness of the stitching.

After the threading hole is laid, the two pieces of soles that are divided into two are recombined into one, and from the soles of the shoes, drill through the upper soles with hand drills, but the lower soles are only turned to half of the position, and cannot be penetrated entirely, otherwise water will seep from the holes to the inside of the shoes.

These holes are designed to hold the upper and lower soles more securely, and when the upper is fixed to the upper sole, bamboo tenons with fish maw glue are hammered into these holes.

At the same time, it is possible to make a heel and install it with a bamboo tenon. The heel and the lower sole are set into a whole, in order to be waterproof, the same time only the lower sole is drilled, and the heel part that is in contact with the ground is only half drilled, which is actually the same as the later generations of new shoes with a spike on the heel of a piece of wear-resistant cow tendon soles.

When it is dry, apply fish bladder glue to the exposed bamboo tenon again, and then knock it in on the hole in the lower sole to make the upper and lower soles become a whole.

This kind of hole position can be arranged at will, as long as it can play a reinforcing role, and the number and position are also determined by this standard.

Prior to this, the contact surface of the lower sole and the upper sole were all coated with fish bladder glue, and the two contact surfaces were pasted firmly, and those bamboo tenons played a role in strengthening the strength of the paste, and the shoe nails were the same meaning.

When the two soles are coated with glue and pasted firmly, heavy objects such as large stones can be moved to compact the pasted soles to promote the three parts of the soles to be better intertwined.

After the glue on the soles and heels of the shoes is completely dry, cut out a model of wood that matches the shape of your feet and put it into the shoes.

The animal skin, which is attached to the sole of the shoe, is cut and wrapped according to the size of the model, and the silhouette is sewn to match the shape of the foot.

In order to better play the role of waterproofing, it is generally only opened in two at the center line of the shoe, and then the excess animal skin on the bevel is subtracted. The midline section is sutured.

As for the hides at the heels and ankles, keep the hides as long as possible, cut off the excess skins on the width and sew them together, and a heightened fur boot is ready.

Wang Tian followed this process and made a boot, but did not apply glue, and after making the upper of the leather boot, he disassembled the entire shoe.

Flatten the upper back so that you get a flat cut of the upper.

After that, just use paper to trace the shape according to the upper development drawing, and then trace the size of the sole.

As long as the left and right sides of the other shoe are distinguished, you can cut and sew the animal leather upper in advance according to the outline traced on the paper, and you can quickly make the other foot of the shoe.

At the same time, Wang Tian also got the material size of his shoe size, and when he made shoes of this size again in the future, he could rely on the reserved sole paper style and upper paper style to uniformly cut out the material of the sole and upper in advance.

In this way, the assembly line operation can be achieved, and the waste of upper materials can be reduced as much as possible, and in the case of ensuring that a whole piece of leather is used as much as possible, the paper style of the obtained upper can be unfolded, and the whole leather can be reasonably placed, so that the same leather can cut out more upper materials.

This is the same as making cut skinny leather clothes, where it can be spliced, it is spliced, and those places that cannot be spliced can be avoided in advance for waterproofing.

More importantly, by standardizing the operation method, it is possible to produce in an assembly line manner. In this way, only a few shoe sizes need to be determined, and the material can be unified and the production can be unified.

As long as the person who wears this shoe size, from the product produced by the standardized assembly production method, you can pull out about two shoes at will to form a pair.

This will not only make production easier, but also improve the efficiency and speed of manufacturing, and save more materials.

Once the shoes are damaged, you only need to replace the corresponding standard parts to complete the repair of a pair of shoes, and if you use hand-cut shoes to make the body, it will be very troublesome to repair.

In later generations, it was the United States that took the lead in using standardized production methods, which made it possible for any part on the American ordnance, as small as a screw or as large as the launch tube of an artillery shell or missile, as long as it belonged to the same standard part, then it could be exchanged with each other.

For example, when a certain part of your strategic nuclear submarine is damaged and cannot be used, and the corresponding maintenance materials are not available, you may only need to remove the same standard parts from an insignificant weapon to replace the damaged parts of the strategic nuclear submarine.

Let a weapon worth a few hundred yuan temporarily lose its function, but let a strategic weapon worth tens of millions or hundreds of millions continue to play a vital role.

The reason why Wang Tian designed the way shoes were made was naturally not because he had considered this kind of lofty reason, his starting point was very simple, after the shoes were developed, he should be able to successfully shake the pot and be his shopkeeper easily and happily.

Sometimes the progress of civilization in society is driven by lazy people like Wang Tian......