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Winter's Fall 027 Steel Crossbow

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    Even if you really want to use a gun, you can't go to the police station to find it. It is best to find an automatic rifle.  Hong Tao knows where that thing is, but it's a bit far away, and he can't go there by himself for the time being.

    Since there are no bows, arrows and guns for the time being, will the slingshot be possible?  Hong Tao tried this weapon for three days in a row, and the conclusion was that it didn't work at the right time.  The destructive ability of the steel ball to the skull is definitely good, but it is not to the extent that it can be easily penetrated, especially the front.

    It is said that this kind of power is enough to deal with living people, and it will definitely make the opponent fall down in one fell swoop.  But it doesn't seem to be very effective when used on zombies. Just crack or even shatter the bones. As long as the brain inside is not obviously damaged, they will be fine. What to do, don't be annoying!

    If we increase the number of leather thongs, Hong Tao claims that his arms have no supernatural power. It is not only too laborious to pull them apart a few times, but also affects his aiming. His hands are trembling. If he can't shoot accurately at a distance of more than ten meters, he basically has no chance to shoot again.  up.

    "Let's be self-reliant" Hong Tao had no choice but to choose the most time-consuming and labor-intensive method, which was not necessarily useful, and made it himself!

    What to make, bows and arrows and guns will definitely not work.  Although the former has the technology and materials, but basically no one knows how to use it except yourself, and it doesn't make sense to create it.  The latter really has no equipment, no materials, and no blueprints. Even if it is barely made, it is useless without bullets.

    "After being around for several lifetimes, it's still easy for you to use!" However, there is one thing that Hong Tao can make and use, and it is easy to use, and it is easy to popularize, and that is the crossbow!

    Not to mention Hong Tao, as long as you practice a little and shoot a few more times, both Chu Qiu and Zhang Ke can use it.  And this thing has another advantage, its power will not be reduced in anyone's hands, and its combat effectiveness will not be affected by technology and strength.

    Compared with the previous lives, Hong Tao's way of making crossbows can be said to be a shotgun for a cannon, starting with a steel crossbow, without a makeshift one.  In fact, there is no condition to make do with it. There is only one material for the crossbow arm that can be found at present, the leaf spring!

    Leaf spring, the full name is leaf spring, commonly known as bow plate.  It probably means that several strips of spring steel plates are stacked together and fixed on the axle to support the carriage.

    Previous car suspension systems used leaf springs, called hard axles.  Later, independent suspensions, cross arms, and multi-links were developed, which increased comfort and reduced load capacity.  However, for trucks and some vehicles that require load, the rear load wheels still use hard axles and leaf springs.

    Since ordinary passenger cars don't use leaf springs, Hong Tao's home is within the second ring road, and most trucks can't get in, so where can he find leaf springs?  The answer is very easy. Tricycles, disabled vehicles, and more and more electric old mans still use leaf springs for their suspension systems.  There is no other reason, this thing has a simple structure, low cost, and low failure rate.

    "I dismantle, I dismantle, I dismantle and dismantle!" Hong Tao can only be a dealer when it comes to building cars, but he is the chief commander, chief engineer and small worker when it comes to dismantling cars.  No one needed to go out alone with tools, dismantled a tricycle and two Old Man Les in two hours, and returned with a large pile of spring steel plates.

    "Grandpa Hong, are you going to make a bow and arrow?" Zhang Ke saw the long strip of steel with a natural curvature. Although he didn't know what it was, the first thought in his mind was a weapon!

    "Hey hey, you guessed half right! Today I'm going to turn on the lights and go get the wire reels!" Smart kids like everyone, Hong Tao is willing to teach whoever he likes, and he can't succeed if he doesn't want to learn  .  So Zhang Ke became a temporary worker, responsible for serving tea, water, and tools.

    The leaf spring of the tricycle is not the same size as the leaf spring of the old man. The tricycle is relatively thin, 6 mm thick, 6 cm wide, more than 80 cm long, and 11 cm high.  The old man's one is slightly shorter, more than 70 centimeters long, but thicker, 7 millimeters.

    Which one is the most suitable for a crossbow arm?  Hong Tao didn't know either, so he had to do the same to test the effect.  The specific method is very simple. First, tie the bow board with a steel wire to test the tension. If it is too hard, find a way to make it soft. If it is too soft, add a short bow board to make it harder.

    The actual result was too hard, even Hong Tao couldn't be satisfied.  At this time, it's time for the angle grinder to play. With a spark and lightning, the two ends of the 6 cm wide tricycle bow board become 4 cm wide.

    Try again, if it doesn't fit, cut it finer.  This work continued until after 8 o'clock in the evening, and the crossbow arm was finally shaped successfully.  One is slightly longer made of tricycle bow boards, and the other is slightly shorter made of Laotou Le bow boards.

    Next is the crossbow body, which is simpler. Find a 5*10 wooden square and saw it into a length of 80 cm.  With the narrow side up, use an angle grinder to create a shallow groove for the bolt.

    There is already a hole in the middle of the bow board for fixing bolts, and a hole is drilled below, and two 12cm long bolts are used to fix it to the top of the wooden square, and it is properly formed.

    BallistaI just use the scraps of the cut bow board and grind it with an angle grinder. It doesn¡¯t look like it. As long as I have made match guns, steel ball guns, and spray guns when I was a child, I know how to make a crossbow.  Put two thin bolts on the body of the crossbow and fix it on the side, just enough to hang the bowstring, no spring is needed.

    Try the effect of the crossbow arm first, and then talk about details, light weight and ergonomics. Otherwise, it will be light, beautiful and practical for a long time, but the effect of the crossbow arm is not good, and the previous work is all useless.

    "Break ‡R ÎË" The crossbow bolt was the easiest. Hong Tao directly took a stainless steel chopstick and sharpened it and put it on it. Standing five meters away, he pulled the crossbow trigger towards the courtyard gate.

    "Go to bed, let's talk about it tomorrow morning!" The chopsticks were accurately nailed to the gate of the courtyard. As for the aiming, that was the details. What Hong Tao mainly wanted to see was whether the pulling force of the crossbow arm was enough.

    When he grasped the tail of the chopsticks, stepped on the courtyard door, changed from one hand to two hands, and still didn't move a single bit, the pull test of the crossbow arm was basically passed.  The chopsticks penetrated at least two inches, piercing through the pine board covered with white iron, and there is no problem in penetrating the skull with this force.

    God seemed to know that Hong Tao was going to work, so it began to rain lightly in the second half of the night, and it not only didn't stop until the early morning, but also became heavier.  Since God didn't want him to go out, Hong Tao simply complied with God's will and continued to perfect the steel crossbow steadily under the ceiling.

    After last night's test shooting, the pulling force of the crossbow arm is sufficient, but there is a small problem. This pulling force can only be pulled by stepping on the crossbow arm with both hands. How do Chu Qiu and Zhang Ke use it? They must not have enough strength.

    There are two solutions at this time, one is to use an eccentric wheel block, and the other is to use a pulley block.  In the end, Hong Tao chose the pulley block. Although the eccentric wheel block is more effective, it is also more complicated, and it is not as easy to find as the pulley.

    A pulley is welded to each end of the crossbow arm, and a pulley is also installed on one side of the front third of the crossbow body to form a set of fixed pulleys and movable pulleys on the left and right.

    The junior high school physics teacher taught us that the fixed pulley does not save effort, but it can change the direction of the pulling force.  The pulleys on both sides of the crossbow body are the fixed pulleys, which change the direction in which the bowstring is pulled back, and become the direction in which the arm pulleys face the fixed pulleys.

    The pulleys at both ends of the crossbow arm are movable pulleys. The junior high school physics teacher said that the movable pulley cannot change the direction of force, but it can save effort.  How much do you save?  A movable pulley saves half!

    Knowledge is a wonderful thing, isn¡¯t it? Simple four small pulleys and a few dollars can turn a crossbow that can shoot through a two-inch wooden board into a toy that even a teenager can pull apart!

    Zhang Ke can indeed pull it away, and he can also lift it up and launch it.  However, this thing is still too rough, and it is difficult to grasp the shooting distance without Wangshan, which seriously affects the accuracy.

    The following is all fine work. The magnet strips in the door curtain are found to be embedded in the grooves on the crossbow body to absorb the crossbow arrows and prevent them from falling due to movements.  Slots are made on the body of the crossbow to add return springs to further improve the crossbow machine.

    ? The wood of the crossbow body is rounded and polished, and several hollows are made without affecting the tension of the crossbow arm, so as to reduce the overall weight as much as possible and adjust the center of gravity.  After many test shots, I probably found the landing point for a walk, and made a simple look at the mountain

    The rain has stopped, lunch is over, and Hong Tao is still busy under the canopy.  It is not enough to have a crossbow, you must have a suitable crossbow.  There are only two pairs of stainless steel chopsticks, and they cannot be attracted by the magnet, so they are useless.

    The ground nails used to pitch tents in the wild when fishing in the past were good. Of course, the original ones were not effective. Those ground nails were just doable, short and soft, and they couldn¡¯t fix the tent at all when they touched gravel and mud.

    The ground nails used by Hong Tao are all custom-made by a small processing factory. The half-meter-long structural steel is slightly thicker than chopsticks. As long as it is divided into two, and the round head is ground into a triangular pyramid, the armor-piercing ability has to be doubled.  times
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