Doomsday rat

Chapter 28 Steel Crossbow

Even if you really want to use a gun, you can't go to the police station to find it. It's better to find an automatic rifle.That thing Hong Tao knows where there is, but it's a little 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, can slingshots be made?Hong Tao tried this weapon for three days in a row, and the conclusion was that it worked and it didn't work.The destructive ability of steel balls to skulls is definitely good, but it is not enough to penetrate easily, especially the front.

It is said that this kind of power is enough to deal with living people, and it will definitely make the other party lie down.But it doesn't seem to be very effective when used on zombies. Just cracking or even breaking the bones, as long as the brain inside is not obviously damaged, they are just like nothing, what to do, not annoying!
If we increase the number of pimps, Hong Tao claims that his arms have no supernatural power. Reluctantly pulling away a few times is not only too laborious, but also affects the aiming. His hands are shaking. .

"Let's be self-reliant..." Thinking of having dinner, he couldn't come up with a good source of weapons, so Hong Tao had to choose the most time-consuming, labor-intensive, and not necessarily easy-to-use method, and make it himself!
What are you doing, bows and guns are definitely not good.Although the former has the technology and materials, but basically no one can use it except himself, and it is meaningless to create it.The latter really has no equipment, no materials, and no drawings. Even if it is barely built, it is useless without bullets.

"I've been around for several lifetimes, but it's still easy for you to use!" But there is one thing that Hong Tao can build and use, and it's easy to popularize, that is the crossbow!

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

Compared with the previous generations, Hong Tao's method of making crossbows can be said to be a shotgun and a cannon.In fact, there is no condition to make do. At present, there is only one kind of crossbow arm material, leaf spring!

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

Previous car suspension systems used leaf springs, known as hard axles.Later, independent suspension, cross-arm, multi-link, etc. were developed, which increased comfort and reduced load capacity.However, trucks and some vehicles that require heavy loads still use hard axles and leaf springs for the rear load wheels.

Since ordinary passenger cars no longer need leaf springs, Hong Tao's house is in 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 man Le, the suspension system still uses leaf springs.There is no other reason, this thing is simple in structure, cheap in cost and low in failure rate.

"I dismantle, I dismantle, I dismantle and dismantle!" When it comes to car building, Hong Tao can only be a trafficker, but when it comes to car dismantling, he is the commander-in-chief, chief engineer and minor worker.No one needed, he went out alone with tools, dismantled a tricycle and two Old Man Les in two hours, and returned with a load of spring steel plates.

"Grandpa Hong, are you going to make bows and arrows?" Zhang Ke saw the long steel sheet with natural curvature. Although he didn't know what it was, the first thought in his mind was weapons!
"Hey, hey, you guessed half right! Today I'm going to fight at night, and go get the wire spool!" Smart children like everyone, and Hong Tao is willing to teach anyone what he knows if he doesn't want to learn. .So Zhang Ke became a temporary laborer, specializing in serving tea and water delivery tools.

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

Which one is best for crossbow arms?Hong Tao didn't know either, so he had to do the same to try it out.The specific method is very simple. First, tie the bow plate to the steel wire to test the tension. If it is too hard, try to make it soft. If it is too soft, add a short bow plate to make it hard.

The actual result was too hard, and Hong Tao was dissatisfied.At this time, it was time for the angle grinder to come into play. After a spark and lightning, the two ends of the 6 cm wide tricycle bow plate became 4 cm wide.

Try again, if it doesn't fit, cut it finer.This work continued until more than 8 o'clock in the evening, and the crossbow arm was finally shaped successfully.One is a little longer with a tricycle bow, and the other is a little shorter with an old man's bow.

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

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

The crossbow machine is made with the scraps of the cut bow plate, and it is ground with an angle grinder. It doesn't look like it. As long as you have made match guns, steel ball guns, and spray guns when you are a child, you know how to make a crossbow machine.Wear two thin bolts on the crossbow to fix it on the side, just enough to hang the bowstring, no spring is needed.

First try the effect of the crossbow arm and then discuss details, light weight and ergonomics.

"Bang... 嘡... hum..." The crossbow arrow is the easiest. Hong Tao directly took a stainless steel chopstick and put it on it. Standing five meters away, he pulled the crossbow machine against the courtyard door.

"...wash and sleep, we'll talk about it tomorrow morning!" The chopsticks were nailed to the gate of the courtyard accurately. As for aiming, those are details. What Hong Tao mainly wanted to see was whether the crossbow arms had enough tension.

When he grabbed the end of the chopsticks and stomped on the courtyard gate, he changed from one hand to two hands, and he still didn't pull out the slightest bit, then he basically passed the crossbow arm pulling test.The chopsticks pierced at least two inches in, and penetrated the pine board covered with tinplate. There was no problem in piercing the skull with this strength.

God seems to know that Hong Tao has to work, so it started to rain in the second half of the night, and it not only did not stop but also became heavier in the early morning.Since God didn't want to let him go out, Hong Tao simply followed the will of God and continued to perfect the steel crossbow under the ceiling.

After last night's test firing, the crossbow arm had enough pulling force, but there was a small problem. This pulling force can only be pulled by stepping on the crossbow arm with both hands. What should Chu Qiu and Zhang Ke use, they must not have enough strength.

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

A pulley is welded on both ends of the crossbow arm, and a pulley is also installed on one side at 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 of the crossbow arm pulleys toward the fixed pulleys.

The pulleys at both ends of the crossbow arm are the moving pulleys. The junior high school physics teacher said that the moving pulleys cannot change the direction of the force, but it can save effort.How much do you save?A moving pulley saves half!
Knowledge is a wonderful thing, right? Just four small pulleys and a few dollars can turn a strong crossbow that can shoot through a two-inch plank into a toy that even a teenage child can pull away!
Zhang Ke can indeed pull it apart and lift it up to launch.However, this thing is still too rough, and it is not easy to master the shooting distance without Wangshan, which seriously affects the accuracy.

The following is all the fine work. Find the magnet strip in the door curtain and set it in the groove of the crossbow body to absorb the arrow and prevent it from falling due to movement.Slotting on the crossbow body adds a return spring to further improve the crossbow machine.

Round and polish the wood of the crossbow body, and do several hollowing treatments without affecting the tension of the crossbow arms, so as to reduce the overall weight and adjust the center of gravity as much as possible.After many test shots, I probably found the landing point for a walk, and made a simple mountain look...

The rain had stopped, and lunch was over, and Hong Tao was still busy under the canopy.It is not enough to have a crossbow, you have to have a suitable crossbow arrow.There are only two pairs of stainless steel chopsticks, and they can't be attracted by magnets, so they are useless.

The ground nails used to set up tents in the wild before fishing were good. Of course, the original ones didn’t work. Those ground nails were just make-believe, short and soft, and they couldn’t fix the tent at all when it hit gravel and soil.

The ground nails used by Hong Tao are all custom-made by small processing factories. The half-meter-long structural steel is slightly thicker than chopsticks. As long as it is divided into two parts, and then the round head is ground into a triangular pyramid, the armor-piercing ability has to be improved. times!
(End of this chapter)