Chapter 1638： Forged drilled choke tube

The cottage version of the Watt steam engine produced by Da Vinci has good body parts and similar functions, but the boiler is a bit large and the efficiency is not high. This is also Marin's pot, because Marlin has only seen the model of the Watt steam engine in his previous life, but not the boiler.

In this way, under the command of Marin, the half-hanger, even though Leonardo was extremely clever, he did not have such a brain hole to improve the boiler. Moreover, he was busy teaching again, and had no time to improve the boiler.

However, although the boiler is crude benzene and the efficiency is low, the effect is basically achieved. It may not work in trains and ships, but it can be used in industry, but it is enough.

Right now, the Da Vinci version of the Watt steam engine has a speed of 50 revolutions per minute. This rotation speed may be far inferior to the small desk fans of later generations (at least 500 revolutions or more), but it can also be used for industrial production. At least, it is faster than manual, and it is durable enough.

The only problem is that the stability is relatively poor, always shut down and need to be repaired. Obviously, this is the reason for the imperfect design, and there are also reasons for the backward processing technology.

Therefore, the current Da Vinci version of the Watt steam engine, each machine must be equipped with 10 craftsmen, specifically looking at the machine, ready to repair at any time.

It's a bit like a Chinese driver after the founding of the People's Republic of China. Why was the driver a senior professional in China before the 1990s? Because people not only have to drive, but also have to repair the car. At that time, the quality of domestic cars was poor, and it was common to break down halfway. If a car does not repair the car, it is easy to be left on the road. Therefore, at that time, the drivers were all car maintenance experts, and they had to deal with the problems themselves. Fortunately, there were few cars at that time, and the car broke down halfway and was not easy to hit. Otherwise, it is very easy to die when you break down on the high speed ... Of course, there was no high speed at that time, only the ordinary roads were rugged.

A master who can drive and repair cars was naturally a senior talent and a high-paying talent in that era. It was a profession where grandma was very popular.

The same is true of the steam engine just made by Marin. It is a common occurrence for a few hours of operation. Therefore, he equipped each steam engine with 10 craftsmen.

Speaking of which, a full set of tools such as wrenches, vise, screwdriver, etc., have been given to the cottage by the king of the cottage. Now, every artisan in Beihai basically has a toolbox that can be used to repair various machines at any time.

However, there were not many types of machines this year, only a cottage version of the Watt steam engine, which is very crude. Therefore, there are not too many wrenches and screwdrivers of various sizes and sizes in the toolbox of Beihai engineers. Because there is only one type of steam engine, it is enough for everyone to prepare one type of tool.

Although such machines often lie, Marin can do many things with the machine. For example, Ma Lin's unforgettable drill barrel and drill barrel!

As long as the guide rails are set and the drill bit of good quality is found, you can start drilling the barrel. Although the speed of the steam engine is so slow, it can't be compared with the impact drills of later generations. However, as long as you have patience, it is not a problem to drill a few barrels a day.

As for the barrel, Marin was a little uncertain. Because the drill barrel needs a very thick bit, this is difficult to get. The barrel diameter is small, and the drill bit is also easy to get. It is really impossible. Go to Africa and get some diamonds to use as a drill bit. And the barrel ... where is such a big diamond ...

However, it is not impossible, Marin can use wear-resistant high manganese steel to make extra large drill bits. Then, drill the low carbon steel steel column. However, the pre-heating of high-manganese steel will become soft. Therefore, after using it for a while, you have to stop and cool it, so as to prevent it from being used after softening at high temperature. As a result, the speed of the drill barrel may be slow. However, the quality of the artillery produced in this way is absolutely uneven.

Marin remembered that during the Franco-Prussian War, the Krupp artillery was a steel column repeatedly forged with a hydraulic press with great pressure, which made the internal structure of the steel column very tight. Then, he drilled again, and finally got a Krupp steel cannon of good quality, beating the French army to take care of himself.

However, at present, it seems not very useful. It is enough to get a bronze gun by iron casting. You can also waste a good forged gun. Because, there is no high-power cannonball of the later generation with a high pressure. With the need of black gunpowder and iron ball shells now, casting guns are enough.

It's the barrel of the gun, you can consider drilling a batch. After all, the forged and rolled barrels are of average quality. In order to ensure safety, it is often necessary to make the wall of the forged and rolled barrel thick. In this way, the weight is increased invisibly. Soldiers carrying heavy rifles were also physically exhausted. If you use a forged steel rod to drill the barrel, you don't need to make such a thick barrel, you can save a lot of weight.

For example, the Musquette musket, weighing up to about 10 kg, which is 20 kg! And the 0.76-inch caliber imitation brown bass rifle made by Marin weighs more than 5 kg, which is more than ten pounds.

Later generations of modern rifles with drilled barrels, such as those made by Hanyang, had a total weight of 3.16 kilograms because of the use of drilled barrels, which is about two kilograms lighter than the current imitation brown bass used in the North Sea.

Of course, the caliber made by Hanyang is also much smaller. After all, it was smokeless gunpowder. However, if a drilled barrel is used, it can certainly be achieved by reducing the body weight by more than one kilogram.

Moreover, Marin can now produce a single-base smokeless gunpowder-B gunpowder. Although the output is not large, it can also be used to drill a few small-caliber barrels. For example, it can be used as a Minnie rifle ...

In the era of black gunpowder, the biggest trouble with the rifle gun is that the gunpowder residue is too much to clean up. If it is a smoothbore gun, it doesn't matter. After hitting a pound of lead, the bullets were stabbed with a sliver, or even washed with water. With the rifle gun, many gunpowder residues are directly stuck into the rifle, which is difficult to clean. Moreover, there is a danger of hanging lead.

Marin remembers that during the Civil War between the United States and the United States, the US military's rifle guns had to be cleaned up after firing an average of 100 shots. Otherwise, the rifling is blocked, which can easily cause rifling. Even if black gunpowder with the least impurities in the mid-19th century was used as a gunshot propellant, the barrel must be cleaned up after every 250 rounds. Otherwise, if you blow the rifle, you may be blown up ... and the medical level during the Civil War ... Hey, if you are shot in the leg, you will see the leg, and if you are shot in the arm, you will be cut off the arm ... And, it ’s the barber ...

The early Makqin machine gun ~ www.novelhall.com ~ also had this problem, so it has not been promoted. The Makqin machine gun can shoot 600 bullets per minute on average. In the gunpowder era, the barrel must be cleaned every 250 bullets. In other words, the Makqin machine gun can only be fired for 25 seconds, so you need to stop shooting and perform a major cleanup of the barrel ... isn't it nonsense?

Therefore, although Mark Qin designed the machine gun in 1883, it was not until the smokeless gunpowder was popularized that it was really practical.

what? You said that the Gatling machine gun appeared during the Civil War? Please, it is a multi-barreled machine gun. A machine gun has seven or eight barrels, and at the beginning the rate of fire was only 200 rounds per minute. Even after shooting for 1 minute, an average of 20 to 30 rounds of bullets were fired per barrel, and there was no time to clean the barrel.

Therefore, high-speed machine guns have no practical value until the promotion of smokeless gunpowder. But the smoke pressure of gunpowder is much larger than that of black gunpowder, so a more forged drilled barrel is needed.

Therefore, Marin planned to use a steam engine that was not yet stable, and drilled a batch of forged drill barrels for him, specifically for the marksman troops using smokeless gunpowder. As for ordinary musketeers, let's use ordinary heavy barrels forged and rolled first. Anyway, the pressure of the black gunpowder is low, and the forged and rolled barrel is also enough ...