It is obviously not feasible to bind the bone rak and then use the rope grass, first of all, the grass rope has no way to rub too fine, otherwise it cannot be forced, and the installation hole on the bone rake, Wang Tian can not drill too big, otherwise the bone rak is in use, and it is easy to break into two pieces from the drill hole with a force.

In addition, although the rope grass is tough, it is not wear-resistant, and the part that is connected to the rope will rub against the soil, so it is easy to break.

Now that there is no iron wire tie or anything, Wang Tian can only use leather rope that is stronger than grass rope, and at this time he thought of silkworms and silk.

If there are silkworms, you can extract silk, not only can you make enough strong rope, but also can get a good bowstring material, as for the silk fabric, it seems too luxurious, at most get a small inner to wear.

Wang Tian found a piece of skin with all the surface hair stripped off, and used scissors to cut out a leather strip about a centimeter wide as a rope.

Then in the place where the wooden handle is to be tied, a whole shallow groove is carved with a knife to facilitate the leather to be fixed on it, and the contact surface between the wooden handle and the bone is also smoothed in advance to make it not easy to slip.

Because the greater the contact surface, the greater the friction, the wooden handle is installed upside down, that is, the small tip is the handshake part, and the large tip is fixed to the bone.

In this way, not only can the friction be increased, but also when digging the soil, because the force area on the back of the bone is increased, it can naturally withstand greater force.

We all know the relationship between pressure and cross-section, the smaller the cross-section, the greater the pressure, increase the contact surface between the rake and the bone, you can avoid excessive pressure on the contact surface between them, and reduce the possibility of the bone stalk being broken by the stalk.

When binding, the wooden handle is placed in the middle of the two pairs of bone holes, and the placement direction of the wooden handle is selected on the back of the bone rake, so that it is easier to be stressed when turning the soil.

Next, one end of the leather rope is passed from the front of the bone around the wooden handle, and the position of the leather rope on the wooden handle is adjusted into the carved groove, and then through the other hole, leaving enough length to tie a dead knot with the other end.

Next, the other scalp rope is threaded back and forth through the four holes of the bone, and the cross is tied like a small pony.

Adjust the position of the leather rope so that the upper and lower circles are snapped into the groove on the wooden handle, and the first pass is crossed and wound a total of three times, and then the leather rope head is placed on the back of the bone.

Next, gradually tighten the leather rope, tie the rope at this end to the wooden legs of the two dining tables, and then hand it to the big hand, straighten it vigorously and tighten it tightly, and keep it still.

Then Wang Tian used the length of the leather rope reserved on the first dead knot, and tied a few dead knots with the taut leather rope, so as to complete the first fixed binding.

Next, repeat the previous movement and tie it up for the second and third passes......

Until the mounting hole on the bone is filled with the leather rope and can no longer pass through the leather rope, it is only worn twice during the second pass, and only once after the third pass.

Through this constant winding, tightening, and then tightening, the wooden handle was finally fixed relatively firmly on the bone.

The leather rope with a width of one centimeter looks quite thick, but in fact, it will become thinner as soon as it is stressed, and Wang Tian did not count how many turns it was wound, but it is estimated that 10 circles should be more than 10 times.

As for the specific effect of such an installation method, whether it can withstand long-term use, this needs to be tested later.

The wooden handle is installed in the upper third of the bone rake, which is also exquisite, so as to avoid the bottom end of the wooden handle on the back of the bone rak from being pushed to the ground prematurely when digging the soil, and increase the digging depth of the bone rake.

In fact, in order to make the use of the plough more labor-saving, the wooden handle plow will be better down about 5 cm, now this is just between the excavation depth and labor-saving, to find a relative balance.

The same is true for the choice of bone width, if you want to save more effort, the narrower the better; If you want to increase the efficiency of ploughing the floor, the wider the width, the better.

Therefore, its width must be considered in terms of the toughness of the bone material, the maximum force that the leather rope can withstand, the continuous force of the user, and whether the soil can be turned over when prying.

Things in the world are always flawless, Wang Tian suddenly remembered a movie he had seen before, "Missing a Door", and suddenly felt very reasonable, the ancients... Well, now it should be called a descendant, and you can see things thoroughly, this matter is indeed difficult to complete.

In order to tie the bone and the wooden handle more firmly, Wang Tian also thought of a little trick, he picked up the semi-finished product that had been tied and soaked it in water.

Although the skin will become soft when wet, it will also become larger, considering that after so many circles, the skin that is soaked after moisture will make the binding tighter, and he made a few wooden deeds for backup.

After the bone rake has been used for a period of time and caused loosening, you can use these wooden deeds to knock into the leather rope and the wooden handle or between the wooden handle and the bone rake, which plays a fastening role.

But it is necessary to choose the appropriate knock-in length according to the loosening situation, if you blindly knock it, it is easy to break the leather rope, so the tie is relatively not as tight as possible, everything should be mastered to a degree.

The reason why it is said that it is still a semi-finished product after bundling is because a short beam has not yet been installed, and now it is at most a bone shovel.

While contemplating this short beam, a flash of inspiration flashed in Wang Tian's mind, and he remembered the shape of the coat hook, and then began to rummage through the firewood.

He wanted to find a piece of wood, like the one that would be nailed to the wall in the future, or the coat hook on the back of the door, with a wooden hook at each end of a crossbar.

In this way, the crossbar can be fixed at the upper end of the bone rake, and the two wooden hooks are facing the ground, and a crossbar is tied in the middle of the two wooden grooves, so that the blocking of the wooden handle can be perfectly avoided, and the height of the pressure can be reduced when used.

As long as the height of the bundled crossbar from the ground is shorter than that of the wooden handle, it can play a more labor-saving role.

Luckily, he quickly found a suitable one and installed it quickly.

All you need to do is carefully dig out a through groove with a knife on the small crossbar of the "coat hook", snap it into the bone rake, and drill two holes in the middle of the rope, and then tie it with the wooden handle.

This crossbar only needs to be tied firmly and will not fall off, just step on it and press it down when you use it, and it is not difficult to install.

The production of the ravines seems to be complicated, but in fact, there is no difficulty in the production except for the difficulty of drilling.

So through the efforts of Wang Tian and Dashou, the first bone of the primitive era was completed.

Then Wang Tian couldn't wait to carry the made plough to the cultivation area, he was eager to see how effective this farm tool was when used to plough the ground.

And the big hand was left behind to continue to make the next one, if you want to increase the speed of plowing the land, how can you do it with only one rake!

Lei Yun, who was carried on Wang Tian's shoulder, kept shaking with his movements, and if it was accompanied by music at this time, he would properly look like Gao Laozhuang's second senior brother.

Wang Tian, who looked like a 10-year-old child, carried an old "rake" with a wooden handle, and swayed when he walked, and an inexplicable sense of joy came to his face.

When the leader saw the Son of Heaven, they were not infected by his ancs, and everyone's eyes were invariably on the shoulder of the Son of Heaven.

Looking at the smiling expression on the face of the Son of Heaven, everyone knew that the Son of Heaven must have made something good again, and stood on tiptoe one by one and stopped to watch.

"Boss, let's see if this tool works." Wang Tian has an obvious smug look on his face, as a development engineer, the most proud time is to show everyone his work.

Then Wang Tian came to the edge of the land that needed to be turned over, aimed the plough at the place to be excavated in front of him, and then stepped on the crossbar of the wooden hook with one foot.

Say to everyone: Just like now, aim in the direction you want to dig, then lift one foot and step the shovel firmly into the ground......