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Home Improvement Technology

The Fundamentals of Yagi Antennas

The mere fact that you are showing some interest to read about what this article on Yagi antennas is all about only goes to show that you are indeed very keenly interested to know anything about it. It will help you effectively gain much-needed signal across various mobile electronic devices. So, with this article, we will touch on gaining cellular signal, but things you will eventually learn from here will indeed find their application in WiFi antennas, TV antennas, among others.

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What are Yagi Antennas?

We qualify this type of antenna as a directional antenna, they are significantly helpful in singly enhancing radiation. Radiation is either reception of energy or the transmission of the same, such as cell signal.

This type of antenna comes with a handful of different purposes. They can be taken advantage of in radars, at an industrial level, for movement detection or ham radio. At a consumer level, you can have them enhance the Over-the-Air TV reception. Nowadays, they can help in giving WiFi signals a much-needed boost as well as home and work cell signals where remote regions would be struggling in ensuring the highest quality of telecommunications. However, we are not going to in any way recommend that you use them in boosting your vehicle cell signal.

How Do They Work?

These 3 essential pieces interact together to make Yagi antenna system work, and thus deliver their expected functions:

1.   Director(s)

It provides the directional gain and power to the antenna.

2.  Line

 This serves as the spine of the antenna that holds the reflectors and directors so they would    remain connected to the driven element.

     3. Reflector

Aside from amplifying what is inside of it, it is also used to reject any signal that is out of its range — much like the way a mirror would be reflecting light.

These pieces are among the underlying reasons why this type of antenna can have a higher gain as opposed to omnidirectional antennas. We can’t describe their performance in a vehicle as something good since it is likely going to create an incessant change in direction. But a Yagi’s directional nature is what’s making it ideal for commercial and residential installations since they allow users to have greater gain and reach.

Yagi Antenna versus Omni Antenna

What makes omnidirectional antennas distinct from yagi antennas? They differ a lot when it comes to improving cell signal at the office, at home, even when on the move. Non Directional antennas or Yagi are capable of collecting signals radiated by cell towers within the range of 90°.

In the case of omnidirectional antennas, their signal is capable of reaching an even wider extent (360°).

In addition, the Yagi type of antenna can reach much farther as opposed to an Omni antenna. The rule of thumb here is, the more directional an antenna is, the farther it’s signal tends to go. An extremely directional antenna would be reaching around 10 miles. The standard Yagi type of antenna usually comes with a radius of 45⁰.

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Technology

Applying the Water Jet Cutting Process in the Food Industry

More and more businesses nowadays that are involved in the food manufacturing industry are showing keen interest in employing the water jet cutting process to become part of their production runs. While the technology itself is not considered as relatively new within the food production and manufacturing sector, the growing trend for this now seems to stem from the following 3 areas of concern:

  1. The need to have more level of control over a product. 
  2. The reduction of production costs. 
  3. Flexibility in cutting random food shapes. 

If you are not aware of what this system of cutting is all about, the working principle behind it is the use of a very high-pressure fine jet of water to create the “indestructible blade”. Water used for food cutting and processing applications should be purest and most clean whereas waterjet cutting used in the metal fabrication and machining industries may also involve the use of abrasive materials to help further intensify the waterjet machine’s cutting power and double its cutting speed.

A nozzle for a waterjet cutter can be installed on a servo drive. You can link this to a vision system to make way for accurate product cutting without the need for a human hand guide or touch. There is also a growing demand for various food product offerings to be presented in a variety of shapes, most often in seasonal shapes.

The same servo technology and vision can be taken advantage of to design a cut-out plan and carry out the same. Another advantage of waterjet technology of cutting over traditional blade cutting is the element of cost savings with respect to the change-over of the product. This will not necessarily involve the changing of the physical blade between products. The production runs for different market offerings can easily become seamless, saving your team cleaning costs and downtime.

Waterjet Cutting is very Promising for Produce Items

Even if the waterjet technology has been around for a couple of decades now, many people are still not aware of what it is or how it can work in the farm produce industry. Waterjet cutting in the farm produce industry is where the stainless steel water jet cutting used to be, some 25 years ago, but right this very moment this sector now is on its learning curve.

Research on waterjet technology is further increasing our knowledge base about it. This includes a very recent study headed by the University of California Davis. The project centered around the comparison of waterjet performance against traditional material cutting methods (stainless steel knives) in cutting lettuce. The study eventually showed some cosmetic defects on the cut surface, red discoloration and dehydration indicated by whitening of the affected cut area. 

Several major mechanical factors will help us determine the level of quality of a waterjet cut. This would include the conveyor speed, nozzle, and water pressure. This team of researchers from UC Davis took time to analyze these factors in two of their research tests comparing the traditional method of cutting with the use of reconditioned blade against a waterjet system.

Two different types of nozzles for waterjet are used in one of these tests and they were compared, food-grade nozzles which are extremely sharp and standard. The sharp nozzle comes with special characteristics designed for its continuous improvement on cutting produce. Now as for the fuzzy nozzle, it is the standard nozzle that everybody has, an off-the-shelf type.

The study only validated what everybody was expecting it to do. It proved that the sharp nozzle is the better alternative, the better choice to have for the food industry.

The test made use of very high-quality romaine lettuce. It was cut using four different treatments, sharp knives, sharp nozzles, fuzzy nozzles, and dull knives. The first set of cuts was stored inside a modified atmosphere packaging (MAP) at 4.4° C or 40° F . As for the second set, they packed it in air, then stored at 2.5° C or 36.5° F.  
After the lapse of 18 days, the use of sharp nozzle in the water jet cutting process stood out because it showed itself, proved that it is by far the best cutting treatment since the romaine lettuce it has cut displayed less red discoloration as opposed to what the new blade has cut.

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Technology

Important Things to Know About CNC Plasmacam Router Machines

CNC cutting machines are among the most ubiquitous pieces of equipment in almost all major industries today, from small scale companies to major industry players. There is hardly any aspect of the manufacturing space that does not have any need for automated machining that utilizes CNC technology. 

When an individual chooses to involve himself with the manufacturing sphere, he must understand how significant the role is of CNC plasma kits Australia in obtaining the best market interests of their company. Should you have plans of acquiring a metal shape cutting equipment in the form of a plasmacam, then you must learn a great deal about it first. This is the only way you can veer away from any mistake or wrong decision that will have you waste your effort, money, and time.  

System Cost 

When you talk about the overall system costs, this will have to include all necessary construction, software, accessories, and installation. 

A plasmacam is a complete machine, ready to be used for cutting off parts. Basically, this will necessitate you to have on hand a computer and a handheld plasma torch. You will have no need to buy or build anything else. Also, there is no need for any additional purchases or the need to learn or acquaint yourself with additional software. 

The Use of Handheld Plasma Torch

The machine is making use of a handheld plasma torch so it can offer and deliver the best flexibility and performance. The plasma torch machine normally comes a bit more pricey, yet it does not have any kind of performance advantage to offer as opposed to a handheld torch. There are small plasma cutters that don’t come with a provision for machine torch. But by taking good advantage of a plasma cam machine, the odds of you saving significant amounts of money is high. You can even use it for projects that involve hand cutting work, too.  

Operating Cost

By far, this machine is qualified as the easiest and most convenient of all CNC systems that are currently available in the market. The setup time, training, maintenance, and operating costs are minimal. Another good thing about it is that it eliminates the need for programming. 

Machine Design

Types of Motors 

The machine is using precision servo motors that are equipped with optical encoder feedback. It is very useful not only for accuracy but also for higher speed capabilities, eventually, this translates to higher productivity. Without the speed of the machine and acceleration, it is impossible to achieve a fine cut output from medium to thin materials.

Control System Feedback

The majority of control systems are making use of open-loop feedback. What does this signify? It is telling us that the vibrations and load fluctuations are inducing its motors to jump or skip steps and this is due to the controller losing its position.  

The controllers can report the accurate machine position back to the controller, and this can be attributed to the fact that the servo controller is utilizing closed-loop feedback. With respect to this, the machine’s perfect position can be maintained regardless of the varying conditions.  

If there was a time that you are having doubts about going ahead and giving yourself a go signal to invest in this machine, then the points reiterated above will give you good enough reasons to have a change of heart.

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Technology

What Are The Most Persistent Myths About Water Jet Cutting?

Water jet cutting machines are state of the art cutting equipment that lets you cut through plastics, metal and even carbon fiber, sans any distortion or warping risks. While we see that there is an impressive growth in the wide-scale use and popularity of water jet cutting, there is a proliferation of incorrect belief system about it.

Most of these erroneous impressions and misleading beliefs about it became popular myths. Unfortunately, they are working to the disadvantage of many of us because they are keeping us from our way of seeing exactly what this material cutting method is capable of. Below are some of the most popular myths about water jet technology. While we can’t have an exhaustive list of all the myths surrounding it, it is high time that we debunk some of these myths now.

Abrasive Water Jet is Noisy and Slow Process

We can see and understand the reason why some people today tend to assume that the use of waterjet technology will take a significant amount of effort and time to produce. What this technology makes use of is an accelerated form of erosion. In doing so, it can slice through a material, usually in what can be best described as fast pacing. But even if it is accompanied by fast cutting speed, it is not known to produce mess or noise issues.  

By carrying out the cutting process under a small amount of water, the steam, the spray or the mist it will likely produce will be reduced. Aside from that, underwater cutting will also alleviate noise levels. Cutting just above the water surface is indeed likely to produce only 95-decibel sounds although the distance between the mixing tube and the material will have a role to play here, the cutting process done underwater will produce about 75-decibel noises.  

Water Jets Can’t Cut Complex Parts

Many of us have been misguided about water jet technology. This leads us to think that water jet cutting machines are not applicable for use in precision cutting for 3D components. 

The truth about this is that the recent technological advancements in the 3D printing space have taken the versatility of water jet cutting machine to the next level of perfection. It’s cutting head can now swerve in different directions with its motions being under the control of advanced software. This unique and outstanding feature of waterjet machines allows it to handle the cutting of 3D parts in just one single but fluid motion. Hence, it makes secondary cutting unnecessary.  

Water Jet Pumps Run the Risk of Imploding At any Given Time

For as long as you acquired your water jet pump from some of the accredited and reputable manufacturers, there is absolutely no reason for you to concern yourself about this. Ponder on this now: Compared to air, water is less compressible. This means to say that there is a lesser amount of energy contained in a water jet pump as opposed to a scuba tank. 

It is of paramount importance that water jet machine manufacturers adhere to the strict rules and implemented industry standards when it comes to designing their high-pressure pumps. One vital aspect from these standards will make sure that every high-pressure vessel is designed to make some leaks first before they would even break. This signifies a safety feature for it, there will be no pressure build-up in those regions that are likely to have a catastrophic failure.  

Garnet Mesh Size Don’t Have Any Adverse Effect on Speed

The truth here is, the garnet mesh will have affect cutting speed to a certain extent. Here is for better understanding of this: 

Larger abrasive mesh tends to cut at a faster pace, however, this runs the risk of leaving the surface finish rougher. The most preferred mesh type to use of water jet cutting is 80 mesh, even if a 50 or 60 mesh tends to cut faster. On a thin sheet of metal, will only leave behind a minimal impact.