This article focuses on the key parameters associated with a waterjet, and the necessary adjustments needed to enhance accuracy and efficiency. 

So, whether you are a beginner or professional, you’ll find this guide very helpful.

What is Waterjet Cutting?

Waterjet cutting is a cold cutting machining process utilizing very high pressure of water, or a mix of water and abrasive particles, to cut or shape a variety of materials.

Waterjet technology is popular due to its ability to cut through hard and soft materials without generating heat, which can affect the material’s properties.

The water, propelled through a narrow nozzle at pressures of up to 90,000 psi (620 MPa), creates a cutting stream that slices through metals, ceramics, composites, and more.

What are Waterjet Cutting Parameters?

To achieve optimal results with waterjet cutting, several parameters must be adjusted according to the material and application. The three most important parameters in waterjet cutting are water pressure, nozzle diameter, and feed rate. These factors directly influence the cutting speed, edge quality, and overall efficiency of the process.

Understanding and controlling these parameters ensures consistent, high-quality cuts, minimizing material waste and maximizing productivity.

Water Pressure

Water pressure is one of the most significant factors in waterjet cutting. It determines the force with which water, or a mixture of water and abrasive particles, is propelled through the cutting head. The higher the pressure, the greater the cutting power.

For most industrial waterjet cutting systems, pressure starts at 30,000 psi (210 MPa) and can go as high as 90,000 psi (620 MPa). This range allows the cutting of various materials, from soft plastics to hard metals like stainless steel.

The pressure must be adjusted based on the thickness and hardness of the material to ensure an efficient cutting process without damaging the material or the equipment.

How To Calculate Water Pressure in Waterjet Cutting?

To calculate the ideal water pressure for a waterjet cutting machine, you need to consider both the material type and thickness. For example, cutting soft materials such as rubber or foam requires significantly lower pressure—around 30,000 psi (210 MPa).

In contrast, cutting through hard metals like titanium may require pressure levels close to 90,000 psi (620 MPa). Operators often use software-based tools to determine the optimal pressure for the specific material, ensuring an efficient cutting process while maintaining high edge quality and minimizing wear on the cutting head and nozzle.

Nozzle Diameter

The nozzle diameter in a waterjet cutting machine is a fundamental parameter affecting both the cutting precision and efficiency. It refers to the size of the opening through which the high-pressure water or abrasive waterjet is expelled.

Nozzle diameter directly influences the concentration of the cutting stream. A smaller nozzle creates a more focused stream, ideal for making precise cuts in materials like metals and ceramics. However, this also means slower cutting speeds, as the concentrated stream takes longer to pass through the material.

For thicker materials or when faster cutting speeds are required, a larger nozzle diameter is typically used. The wider stream allows more water and abrasive to flow through, increasing the cutting rate.

However, this can result in a wider kerf width, meaning the material loss during cutting is greater. This tradeoff between speed and precision must be carefully considered when selecting the nozzle diameter for each specific application.

Abrasive Type

The abrasive type is another crucial parameter in waterjet cutting, especially when dealing with hard materials. Abrasive waterjet cutting involves adding fine particles to the high-pressure water stream to enhance the cutting power.

This process is particularly useful for cutting metals, ceramics, and other hard materials that would be difficult to cut with pure water.

One of the most commonly used abrasives in waterjet cutting is garnet. Garnet is a hard, natural mineral that provides excellent cutting performance across a range of materials.

The size of the garnet particles, typically measured in mesh size, affects the cutting process. Finer particles are used for smoother cuts and more intricate shapes, while coarser particles enable faster cutting but may result in a rougher surface finish.

Feed Rate

Feed rate refers to the speed at which the cutting head moves across the material during the waterjet cutting process. It plays a crucial role in determining the quality of the cut, cutting speed, and overall productivity of the waterjet system.

A faster feed rate increases the cutting speed but can reduce the quality of the cut by causing rough edges or stream lag, which is the delay between the high-pressure water stream and the actual cut on the material. On the other hand, a slower feed rate improves edge quality, but it reduces the overall cutting speed and productivity.

How To Calculate Feed Rate in Waterjet Cutting?

The feed rate in waterjet cutting is typically calculated by considering the material type, thickness, and the cutting parameters such as water pressure and abrasive flow rate.

For example, cutting through a thick sheet of metal may require a lower feed rate, around 5-10 inches per minute, to achieve a high-quality finish. In contrast, cutting thinner materials like glass or composites can be done at a higher rate of 50-100 inches per minute.

Software tools are often used to determine the ideal feed rate based on the material’s characteristics and the required cut quality.

Cutting Speed

Cutting speed refers to the rate at which the waterjet cutter moves through the material. This speed is determined by various factors, including material thickness, hardness, and the type of abrasive used. The average cutting speed for a waterjet cutter is around 12 inches per minute.

However, machines like those from Techni Waterjet can reach cutting speeds of up to 700 inches per minute, making them suitable for high-volume production environments. Adjusting the cutting speed is essential to balance efficiency and cut quality.

Higher cutting speeds result in faster production, but this may lead to reduced edge quality, especially in thicker or harder materials. Conversely, slower speeds provide better edge precision and edge quality, as the waterjet stream has more time to cut through the material without causing defects like stream lag. Choosing the correct cutting speed ensures that you achieve a clean and accurate cut while maximizing the efficiency of the waterjet cutting machine.

Cutting Tolerance

Cutting tolerance refers to the level of precision the waterjet cutter can maintain during the cutting process. This is especially important when working with materials that require exact dimensions, such as in aerospace or medical device manufacturing.

Typically, waterjet machines offer a cutting tolerance from ±0.004” (0.1 mm) to ± 0.002 inches (0.05 mm). For even more demanding applications, some advanced waterjet cutters can achieve a tolerance of ± 0.001 inches (0.025 mm).

This level of precision is possible because waterjet cutting is a cold process, meaning no heat is involved that might distort the material.

The ability to maintain tight tolerances ensures high accuracy, which is critical when working on projects where material thickness and dimensional accuracy are of utmost importance. Fine-tuning the tolerance settings on your waterjet system helps to achieve consistently high-quality results across a range of materials, from metals to ceramics.

Standoff Distance

Standoff distance is a key parameter in waterjet cutting that affects the accuracy, cut quality, and the overall efficiency of the process.

It refers to the distance between the waterjet nozzle and the material being cut. The ideal standoff distance allows the water stream to remain focused and powerful, resulting in precise cuts.

If the standoff distance is too great, the cutting power decreases, leading to rough edges and possible stream lag. On the other hand, if the distance is too small, the waterjet cutters may cause excessive wear on the nozzle, affecting the consistency of the cutting process.

Typically, the standoff distance for most waterjet cutting machines ranges between 0.04 to 0.08 inches.

This range ensures that the cutting stream maintains its intensity without damaging the nozzle or compromising the material’s edge quality. Adjusting the standoff distance properly is critical for achieving smooth cuts, especially when working with different materials like stainless steel, aluminum, or ceramics.

How To Measure the Standoff Distance in Waterjet Cutting?

To measure standoff distance, precision tools such as height gauges, probes, or laser alignment systems are used. These tools ensure that the nozzle is positioned at the optimal height above the material, typically within the range of 0.04 to 0.08 inches. Maintaining this distance ensures that the waterjet stream is neither too weak nor too concentrated, resulting in efficient and accurate cuts.

What is the Maximum Standoff Distance?

The maximum standoff distance in waterjet cutting typically ranges from 0.1 to 0.2 inches. This distance allows for effective cuts on thicker or softer materials, but any larger distance could lead to a loss of cutting accuracy and edge control, particularly on denser materials. However, we do not recommend using maximum standoff distance as it is not ideal for most applications.

What is the Minimum Standoff Distance?

The minimum standoff distance is generally around 0.03 inches. Operating at this lower distance ensures that the water jet maintains maximum cutting power and precision, but operators must monitor wear on the cutting head to prevent excessive damage to the waterjet nozzle. Similar to maximum standoff distance, minimum standoff distance is not ideal nor recommended for most applications.

Cutting Thickness

Cutting thickness refers to the maximum depth a waterjet cutting machine can achieve in a single pass. This parameter significantly impacts the cutting process, as different materials and thicknesses require different settings.

Waterjet cutters are known for their ability to cut through a wide range of materials, from metals to composites.

In hard materials, such as stainless steel or titanium, waterjet cutters can typically make cuts between 25 and 30 cm (10-12 inches) deep. Waterjet machines like those from Techni Waterjet are capable of cutting parts up to 12 inches thick in almost any material, offering flexibility for diverse applications.

Pump Power

Pump power is another critical parameter that affects the performance of waterjet cutting machines. The pump is responsible for generating the high-pressure water stream used in the cutting process. The power of the pump determines the pressure level of the water, which can range from 30,000 psi to as high as 90,000 psi.

Higher pump power enables the machine to cut through tougher materials more quickly by maintaining a strong, focused water stream.

Quality of Cut (Q Factor)

The Quality of Cut, often referred to as the Q Factor, is a measure of the smoothness, accuracy, and overall finish of the cut produced by a waterjet cutting machine.

This parameter is influenced by several factors, including cutting speed, material thickness, nozzle condition, and abrasive flow. A higher Q Factor represents a smoother and more precise cut, while a lower Q Factor may result in a rougher surface and less accuracy.

How To Check Q Factor in Waterjet Cutting?

To check the Q Factor, you can visually inspect the cut edges for smoothness and consistency. The surface should have minimal stream lag, with no visible striations or unevenness. Alternatively, specialized measurement tools can be used to quantify the surface roughness, providing a precise value for the Q Factor. Ensuring proper nozzle maintenance and optimal cutting speeds can improve the Q Factor over time.

Water Quality

Water quality in waterjet cutting is a critical parameter because it affects both the machine’s performance and the quality of the cut. The water used in the process must be clean and free from impurities such as minerals and debris that can clog or damage the nozzles and other system components.

Poor water quality can lead to increased wear on parts like the mixing tube, nozzle, and cutting head, and may also result in inconsistent cuts and rough edges.

Water quality is typically measured by the presence of minerals and contaminants that might affect the cutting stream. High-quality water ensures that the abrasive particles used in the cutting process remain effective, providing a consistent cutting speed and ensuring the jet stream maintains its sharpness. 

How to Analyze Water Quality?

To analyze water quality for waterjet cutting, follow these steps:

1. Test for Hardness: Measure the concentration of minerals like calcium and magnesium, as hard water can lead to scaling in the machine.
2. Check for Particulates: Use a water filtration system to check for particles or debris that could clog the nozzle.
3. Measure Total Dissolved Solids (TDS): High levels of dissolved solids can affect the precision of the cut and the longevity of the machine.
4. Use a Water Softener or Purification System: If the water is too hard or contaminated, installing a water softener or reverse osmosis system can help improve water quality.

Kerf Width

Kerf width in waterjet cutting describes the width of the cut created by the high-pressure water jet or the abrasive waterjet. This width can vary based on several factors, such as the type of material, the nozzle size, and the cutting speed. Typically, kerf widths range between 0.03 inches to 0.04 inches.

A smaller kerf width offers higher precision, particularly in intricate cutting tasks, whereas a larger kerf width may be more efficient for rougher cuts or thicker materials.

Kerf width affects the final accuracy of the cut and the amount of material wasted during the process. Keeping the kerf as narrow as possible helps maintain material integrity, improves cut quality, and reduces the chances of deformation at the edges.

How To Calculate Kerf Width in Waterjet Cutting?

To calculate kerf width, you can use the following formula:

Kerf width = Nozzle diameter + 2 × Abrasive particle size

For example, if the nozzle diameter is 0.03 inches and the abrasive particle size is 0.002 inches, the kerf width would be approximately 0.034 inches. The actual kerf width can vary based on water pressure, cutting speed, and material type.

Abrasive Flow Rate

The abrasive flow rate is a key factor in waterjet cutting, as it directly impacts the speed and precision of the cut. Abrasive particles, typically garnet, are mixed with the high-pressure water stream, increasing the cutting power.

An optimal abrasive flow rate ensures a smooth cutting process by balancing material removal and stream lag. If the flow rate is too low, the cutting speed decreases, and the edges of the cut may not be clean.

On the other hand, an excessive flow rate can increase wear on the waterjet nozzle and other components, reducing efficiency. The ideal abrasive flow rate depends on the material being cut, the thickness of the material, and the type of waterjet machine used.

Nozzle Wear Rate

Nozzle wear rate is another important parameter, as the nozzle is subject to constant wear from the abrasive particles passing through it at high speeds. Over time, nozzle wear can affect the accuracy of the cut, causing a wider kerf width and reduced cut quality.

A nozzle that is too worn will result in a slower cutting process and may lead to uneven edges or rough surface finishes.

The nozzle wear rate is influenced by the type of abrasive used, the cutting speed, and the pressure of the water stream. Regularly monitoring and replacing worn nozzles ensures consistent performance and maintains the accuracy of the waterjet system. Techni Waterjet software is able to compensate for nozzle wear.

How to Check Nozzle Wear?

To check for nozzle wear, you can measure the kerf width of a cut or observe any changes in the cutting process. An increase in the kerf width or a noticeable decline in cut quality indicates nozzle wear. It’s also helpful to regularly inspect the nozzle visually for any signs of wear or damage, as well as monitoring cutting speeds and the flow of abrasive materials. Regular maintenance checks will help prevent excessive wear from going unnoticed.

How to Tell if a Nozzle is Bad?

Here are a few common signs that your nozzle may be damaged:

• Inconsistent cut quality: Uneven or rough edges on the material.
• Wider kerf width: An increase in the width of the cut, beyond normal tolerance levels.
• Reduced cutting speed: A noticeable slowdown in the cutting process, even with normal pressure settings.
• Stream misalignment: If the water or abrasive jet stream appears misaligned or erratic.
• Increased abrasive use: More abrasives being consumed without improvement in cut quality.

Orifice Size

The orifice size is a crucial factor in waterjet cutting because it determines the pressure and focus of the water stream. The smaller the orifice, the higher the pressure of the water as it passes through the nozzle.

This results in a more concentrated jet stream, which can achieve finer and more precise cuts. On the other hand, larger orifice sizes allow for more water flow, which may be useful for thicker materials but can lead to a wider kerf and reduced cut quality. Orifice wear over time also affects cutting speed, requiring periodic replacement to maintain consistent performance.

Mixing Chamber Length

The mixing chamber is where the water and abrasive materials combine before being directed at the workpiece. The length of the mixing chamber affects the quality of the abrasive mixture and the stability of the jet stream.

A longer mixing chamber allows more time for the abrasive particles to mix with the water, producing a more even and powerful cutting stream.

However, an overly long mixing chamber can introduce more wear and reduce the cutting efficiency. The optimal mixing chamber length depends on the type of material being cut and the desired precision, balancing wear rate and cutting speed to achieve the best results

Cutting Angle

The cutting angle in waterjet cutting refers to the angle at which the jet stream makes contact with the material being cut.

This parameter plays a critical role in the accuracy of the cut. For most applications, the waterjet operates perpendicular to the material, maintaining a 90-degree angle. However, depending on the material type, thickness, and specific design requirements, an angled cut may be necessary.

Adjusting the cutting angle impacts edge quality and can reduce stream lag. When cutting thicker materials, modifying the angle helps improve the flow of the abrasive stream, ensuring a cleaner separation cut and reducing kerf width.

Piercing Time

Piercing time is the duration it takes for the waterjet to initially penetrate the material before beginning the cut. This parameter is especially crucial for harder materials like stainless steel, stone, and titanium.

A longer piercing time is necessary for dense or thick materials to prevent damage or misalignment. Shorter piercing times are suited for softer materials or thinner workpieces.

The speed at which the piercing happens is a balance between the waterjet’s pressure, the orifice size, and the material thickness. Proper control of the piercing time prevents unwanted material fracturing and ensures a clean, precise cut from start to finish.

Ambient Temperature

The ambient temperature in which waterjet cutting takes place can affect the machine’s performance. Waterjet machines operate best within specific temperature ranges, as extreme cold or heat can impact the water flow rate and the integrity of the materials being cut.

For instance, low temperatures may lead to a thicker water stream, reducing the machine’s overall cutting speed. In contrast, high temperatures can cause fluctuations in water pressure, potentially affecting cut quality.

Properly managing the ambient temperature around the waterjet machine ensures consistency in the cutting process, helping maintain edge quality and reducing the chance of stream lag or material deformation.

Humidity Level

Humidity level is an environmental factor that can affect the performance of waterjet cutting machines. High humidity in the air can lead to condensation within the waterjet system, potentially causing inconsistencies in the water stream.

This can result in variations in cutting speed and stream lag, leading to less precise cuts. On the other hand, low humidity may contribute to static electricity buildup, which could affect the components of the cutting system.

Maintaining an optimal humidity level ensures that the water stream remains stable, allowing for consistent cutting results and reducing the likelihood of damage to the machine or material.

Edge Quality

Edge quality in waterjets refers to the smoothness and accuracy of the cut edge produced by the waterjet cutting process. This parameter is influenced by several factors, including the waterjet stream’s speed, the material being cut, and the cutting method used.

The goal is to achieve clean and precise edge qualities without burrs or rough surfaces.

Properly managing parameters like cutting speed and waterjet system settings helps produce high-quality edges, which are crucial for applications requiring exact tolerances and superior finish, such as in aerospace and automotive industries.

How to Optimize Waterjet Cutting Parameters?

Optimizing waterjet cutting parameters depends on understanding how different materials and applications require specific settings to achieve the best results. Adjusting factors such as cutting speed, abrasive flow rate, and nozzle size can significantly impact the quality and efficiency of the cutting process.

Here are key considerations for optimization:

• Material Type and Thickness: Softer materials like foam require less abrasive flow and faster cutting speeds, whereas harder materials such as stainless steel or titanium benefit from a slower cutting process to achieve cleaner edges. For example, cutting stainless steel might require adjusting the waterjet machine’s abrasive flow and reducing speed to maintain precision.
• Edge Quality: For applications requiring smooth edges, such as glass cutting, reducing the cutting speed and adjusting the abrasive mesh size can minimize roughness and stream lag. This improves cut quality and reduces post-processing time. 
• Abrasive Mesh Size: Fine abrasives are ideal for achieving tight tolerances, while coarser abrasives work better for rapid material removal in thicker materials. In cutting ceramics, using a finer abrasive mesh can prevent chipping, improving both productivity and quality.
• Nozzle Wear: The wear on the waterjet nozzle affects cutting performance over time. Regular maintenance ensures the nozzle remains in good condition, avoiding the loss of cutting precision due to stream misalignment.
• Real-World Example: A manufacturer cutting marble for architectural projects discovered that by reducing cutting speed and using a specific abrasive size, they reduced edge roughness and material waste, leading to better overall efficiency and reduced costs.

Conclusion

Waterjet cutting process is here to stay and knowing how best to incorporate it into your operations will help you improve performance and even reduce work hours – considering how slow other cutting processes can be. 

So, following the tips listed above can significantly improve the end results of your applications. Fine-tuning variables like cutting speed, abrasive flow and nozzle condition will further help you prevent unnecessary repairs and maintenance. 

The post Waterjet Cutting Parameters: 21 Types and Optimizing Them appeared first on TechniWaterjet.

This article will explain the various water jet machine sizes. Based on the information presented here, you can determine which size will suit your requirements.

What is Waterjet Cutting?

Waterjet cutting is a process that uses the force of a high-pressure water supply to erode material from a workpiece. Waterjet cutting does not require physical contact of the workpiece with traditional tools. Instead, cutting occurs from a distance, and only the waterjet stream makes contact with the workpiece material. Abrasive materials are added to the water to facilitate quickly cutting harder materials. The process is then called abrasive waterjet cutting.

What are the Different Sizes of Waterjet Cutting Machines?

Waterjet cutting machines do not have a formal size classification. However, these machines can be divided into four informal categories. These categories are based on the table size of the machine. Let us go through these categories one by one.

Small Waterjet Machines

Small waterjet machines have a table size of up to 1.2 m x 1.2 m (4 x 4 feet). Small workshops install these machines for short projects. Many worships use these machines to test the technology or save the initial investment.

Advantages of Small Waterjet Machines

• Initial Investment: Small waterjet machines require little initial investment. These are enticing options for manufacturers who cannot afford the high cost of big machines.
• Multiple Machines: Workshops can install two small waterjet cutters at the cost of a single large machine. This leads to a doubling of the production rate.
• Learning Waterjet: Small waterjet machines are a great way for newcomers in the industry to learn this technology. They can experiment with ways to use the machine and its settings for the best possible operation.
• Movable: Small waterjet machines can easily move around the shop if the layout plan changes. This makes it preferable for workshops looking at a growing or changing landscape.
• Precision: These machines provide a higher precision since they work on a smaller scale than their larger counterparts.
• Less Pressure Loss: Small waterjet machines reduce the travel area for the water. This reduces the pressure loss of the machine.
• Faster Cutting: Small waterjet machines can cut faster due to reduced pressure loss.

Disadvantages of Small Waterjet Machines

• Cutting Area: The disadvantage of small waterjet machines is the limitation on the area of workpiece materials. Many small waterjet machines overcome this limitation by providing a feeding mechanism for larger workpiece materials.

Applications of Small Waterjet Machines

Small waterjet machines can be a great fit for industries that create parts of a lower geometric scale. Some examples are:

• Medical devices
• Glass industry
• Ceramic products
• Printed Circuit Boards (PCBs)
• Smaller electronics products

How Much Does a Small Waterjet Cutter Cost?

Small waterjet cutters can be acquired for around $30,000 to $50,000. Some models with added features can even go up to $100,000.

Medium Waterjet Machines

Medium waterjet machines have a size between small waterjet machines (4 x 4 feet) going up to 4 x 8 feet (1.2 x 2.4 m). These machines are design to cut a workpiece material with a large area. They sometimes come with multiple cutting heads to facilitate faster cutting. However, for optimal use of multiple cutting heads, it is better to go with larger options.

Advantages of Medium Waterjet Machines

• Larger Workpiece: Workshops can cut a larger area of material directly. This is the main reason they opt for medium waterjet machines.
• Higher Number of Pieces: Due to larger workpieces, more number of pieces can be obtained in a single setup. This can reduce the lead time for the operation.
• Easy Setup: Their setup, installation, and uninstallation is relatively easier compared to the goliaths that larger waterjets are.
• Movable: These machines are not as portable as small waterjet machines. However, they can still be moved around the workshop with some effort required.

Disadvantages of Medium Waterjet Machines

• Cost: Medium waterjets can cost a lot more than small waterjets. Very often, two small waterjets can come in the place of a single medium waterjet.
• Large Workpiece: The large workpiece is an advantage and a disadvantage. Loading of a large workpiece can be difficult. In many cases, the loading and unloading time negates the time saved in cutting more pieces.

Applications of Medium Waterjet Machines

Medium waterjet machines are used by niche industries that require fitting a particular size workpiece. Glass cutting is one of the main industries that utilize these machines. For instance, medium waterjets are used to make glass panels, partitions, and mirrors due to the particular size of the workpiece.

Cost of Medium Waterjet Machines

Medium waterjet machines can fall between $60,000 to $100,000. Going too high over it isn’t recommended, as multiple smaller waterjets or one large waterjet can be a better fit.

Large Waterjet Machines

Large waterjet machines can accommodate workpiece materials up to 8 x 16 feet (2 x 4 m). In many cases, this limit can be even more. Usually, these machines work with multiple machine heads. Large waterjets are common in industries that require high production numbers or very large structures.

Advantages of Large Waterjet Machines

• Workpiece Size: Large waterjets can load large sheets of material on the table. This provides the ability to create large frames for various industries.
• Production Rate: After a single setup, multiple heads can produce a large number of parts without unloading and reloading the material over and over.
• Cutting Speed: Multiple cutting heads exponentially increase the speed of the entire operation.

Disadvantages of Large Waterjet Machines

• Cost: Cost is the primary factor prohibiting people from buying a large waterjet machine. This is especially a deterrent for people new to this technology.
• Workpiece Setup: Large waterjet machines are designed to load a large workpiece. However, loading and unloading material of that size of workpiece is a herculean task. For instance, take the case of an 8 feet x 16 feet steel sheet just 0.1 inches thick. This sheet would weigh around 237 kg (522 lbs). This weight increases linearly as thickness increases.
• Secondary Operations: Waterjet machines are used for secondary finishing in many cases. However, large machines eliminate such usage. The proportions and setup requirements are unsuitable for secondary finishing applications.
• Tolerances: Large waterjets don’t provide as good tolerances as small waterjet machines. Therefore, for tolerance-specific applications, large sheets of material are cut down with a large waterjet and then machined with small waterjet cutters or laser shops.

Applications of Large Waterjet Machines

Large waterjet caters to two types of situations. The first situation involves high-volume manufacturing. Manufacturers cut a single part into many different pieces simultaneously by using a waterjet. The second situation involves areas where large-sized parts are required. A common example is the frames used in the aerospace and aircraft industries. Therefore, some common applications of large waterjets are:

• Aerospace Industry
• Packaging Industry
• Signage
• Oil fields
• Marine industry
• Transportation

Cost of Large Waterjet Machines

Large waterjet machines usually start at $100,000. The prices have a wide range and no upper ceiling. The main driving points are the pressure pump

Custom Waterjet Sizes

Custom waterjet sizes are those which are specifically designed for a particular application. These sizes generally apply when manufacturers want to incorporate waterjet cutting in their assembly line. The material moves through an automatic feeder mechanism to these machines and they process it as required. These machines usually don’t use standard material sizes.

Applications of Custom Waterjet Machines

Custom waterjets are mainly used where manufacturers want to speed their operation. These machines provide a seamless workflow without the need for loading or unloading material. These machines are also used in niche industries where standard sizes cannot fulfil the requirements. Common examples are:

• Food Cutting
• Carpet Industry
• Diaper cutting
• Eye Surgery
• Mining Applications
• Cardboard Box
• Paper Industry

How Much Does a Custom Waterjet Cost?

Custom waterjet machines can easily cost over $100,000. These machines cost more than standard machine sizes of comparable areas. This is because custom machines require a dedicated build and installation based on the requirements.

Does Machine Size Matter in Waterjet Cutting?

Yes, machine size indeed matters in waterjet cutting. You cannot just buy any machine and fit it into your workshop. The workshop should be able to accommodate the waterjet machine. Additionally, the size also affects other parameters like accuracy and cutting speed. Last but not the least, the size of the machine restricts the size of the workpiece that you can cut.

Are Big Waterjets Faster Than Small Waterjets?

Big waterjets with multiple cutting heads have a faster cutting speed than small waterjets. Additionally, they have fewer loading and unloading cycles. Therefore, the overall operation is exponentially faster. However, loading and unloading the large workpiece material can require some effort.

What Waterjet Size is Right For You?

Waterjet machines are not ‘one size fits all’. You need to buy the machine size that suits your requirements. Here are some factors that typical buyers should consider in this regard:

Production Environments

The first thing to consider is how much size your workshop can accommodate. You cannot fit a 4×8 feet machine in a workshop area of 4×6. Additionally, some clearing is required around the machine for the operator to move around during setup and unloading. Therefore, measure the space in your workshop that you can freely allocate to the waterjet machine.

Application

The next thing to consider is the industry in which you will use the waterjet cutter. Every industry has a particular size that is suitable. For instance, large or even medium waterjet machines are useless in the jewelry industry. Similarly, small waterjet machines cannot make large aircraft turbine blades.

Budget

Determine the budget that you can allocate to the machine. If the cost is restricted, buying a smaller waterjet cutter is a good idea. You can buy another small waterjet cutter after a period of time when the capital is available. You can opt for a large machine if you have the capital and want a high-production operation.

Where to Find a Waterjet Cutting Machine?

Techni Waterjet is the most reliable supplier of waterjet cutters worldwide. These machines are the industry standard when it comes to waterjet technology. Workshops in every sector use Techni Waterjet cutters in their assembly line.

There are many different models and size options in the catalog. You can choose the product fit for you. Additionally, every machine comes with integrated software, 24×7 customer support, and prompt availability of spare parts.

Endnotes

The size customization of waterjet technology is an attractive factor of this technology. Whether you have a small job shop or a large workshop for automobile modification, a waterjet machine is available for your requirements.

Get in touch with Techni Waterjet to learn more about these machines and find the ideal fit for your needs.

The post Water Jet Cutter Sizes – 3 Tips How to Choose the Right One appeared first on TechniWaterjet.

This article will answer this question and explore the environmental impact of waterjet cutting:

Overview of Water Jet Cutting

The Waterjet cutting process uses a water stream at extremely high pressure to pierce materials. The width of the water jet is smaller than human hair. The resulting force is enough to cut even the hardest metals and alloys. Fine abrasive particles are also added to the water stream to aid in the cutting action and speed up the process.

Waterjet cutting is a widely adopted industrial technology. It has no limits to the thickness that can be cut. Additionally, it is versatile and can cut through any material. These reasons have made it the preferred cutting tool for professionals across multiple sectors like medical, agriculture, defense, architecture, fabrication, automotive, etc.

Is Water Jet Cutting Technology Environmentally Friendly?

Yes, waterjet cutting is a completely environmentally friendly process. This includes both pure and abrasive water jet cutting. In fact, waterjet technology is the greenest process when compared with alternatives. There are many reasons to support this, such as:

Recycled Water

Waterjet cutting is a closed-loop process. The water consumed during cutting is drained and reused over and over. There is no waste water in waterjet cutting. This is one of the most crucial environmental benefits of this technology. Other cutting processes use disposable tools you must throw away after a breakdown.

Reduced Waste

Waterjet cutting generates a lesser amount of waste as compared to traditional cutting methods. The material removed during cutting gets dissolved in the water. This material can be strained and recycled later. This makes waterjet cutting a highly efficient process.

No Coolants and Lubricants

Waterjet cutting does not require mineral oil or other environmentally harmful materials as lubricants or coolants. The lack of coolant is because the water used in the process is a coolant. The lack of lubricant is attributed to the fact that water is self-lubricating, unlike mechanical cutting systems.

Healthier Work Environment

There are no noxious fumes or material dust in the work environment using waterjet cutting.  This means that the workforce can operate in a safer space. It also eliminates the emission of toxic gases in the atmosphere.

No Hazardous Waste

Hot-cutting processes such as laser and EDM create molten material known as slag. This is an unusable and toxic material. However, waterjet cutting does not produce any hazardous leftovers. The leftover is the material dust dissolved in the water. It is hazardous only if the material you are cutting is hazardous. When cutting these hazardous materials, check in with the local environmental laws for compliance.

Reduction in Transportation Carbon Footprint

Large components require large-scale transportation, such as mega trucks, which release high carbon emissions into the atmosphere. Waterjet cutters can cut these large workpieces into smaller parts. The smaller parts can be easily transported together on a smaller transport.

Reduced Energy Consumption

Waterjet cutting machines consume less energy overall due to their automated nature and lack of physical heat loss. Additionally, components cut with waterjet cutting do not require secondary finishing. This further saves the energy consumption of the process.

Lower Part Rejections

Waterjet cutting has a lower part rejection rate than other cutting processes. This is due to the high precision of this technology and the lack of thermal processes involved. The lack of rejections decreases the amount of wastage caused.

Lesser Noise Pollution

Waterjet technology brings the option of underwater cutting, which significantly reduces the noise of the entire operation. Underwater cutting causes a noise level of 75 dB. For perspective, normal room conversations occur at around 60 dB, and vacuum cleaners create around 80 dB. Therefore, underwater cutting is considered a quiet operation by industrial standards.

Organic Abrasives

Waterjet cutting most commonly relies on garnet abrasive. Garnet is a naturally occurring mineral formation found in abundance in the earth’s surface. Therefore, using this abrasive does not harm the environment in any way.

Efficiency

There is a high degree of automation in waterjet technology. The equipment consumes energy only when it is involved in cutting. There is no requirement to warm up the apparatus. This further increases efficiency and helps in reducing energy requirements.

Mitigating the Environmental Impact of Waterjet Cutters

The abovementioned factors clearly depict how waterjet cutting is a great fit for an environmentally cautious setup. The environmental impact of waterjet cutting technology can be increased even further by adopting equipment like:

Waterjet Cutter Chiller

The waterjet cutter and the workpiece do not face any thermal effects during the cutting process. However, the pump that generates the high pressure is prone to heating. Using a waterjet chiller helps in keeping things in control at this end. With a waterjet chiller, the pump remains at a safe temperature. This reduces heat losses and prolongs the life of internal pump components like seals. It can be helpful if you want to go in the green direction.

Closed-Loop Filtration System

Closed-loop filtration systems collect the used water and treat it. The treated water is then fed back into the system. This reduces water wastage by a huge factor and reduces the water requirement for the operation. These systems do the job of filtering the water and fixing it for hardness.

Abrasive Removal System

An abrasive removal system automatically filters out the abrasive sludge from the water. The removed abrasive can be reused after proper treatment or disposed of properly. This leads to a waterjet system emitting zero pollutants into the environment.

Techni Waterjet- The Green Initiative

All Techni CNC waterjet machines are designed to be completely environmentally friendly options. Organizations that focus on green technologies prefer Techni Waterjet as their supplier for industrial cutters. These machines are sturdy and designed to last longer than any other alternative. This leads to less frequent breakdowns and lower waste generation.

Additionally, all Techni Waterjet cutters are fitted with automated control and compatible software. This keeps the machine’s operation efficient, saving energy costs. The machines include underwater cutting and multi-stage water filters to eliminate draining any polluted water.

Conclusion

Waterjet cutting is the best solution from an environmental perspective. In this regard, hardly any cutting method outperforms traditional water jet cutting. Waterjet cutting is the way to go if you are looking for green technology to fulfill your cutting requirements.

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What is kerf in waterjet cutting?

Kerf refers to the amount of material that is removed from the workpiece during waterjet stream cutting. To understand this better, think of a carpenter working on a wooden piece with a saw. When cutting the piece, some of the wood is removed from the point of impact and turned into sawdust. This is the kerf for the saw cutting process. Similar is the case in waterjet cutting. When high-pressure water hits a workpiece, the material of the workpiece is disintegrated at the point of impact, and the amount of material removed is proportional to the thickness of the water stream.

Why is a kerf important?

Kerf is an important factor to consider when we are talking about any cutting process. If the kerf is higher than acceptable, there will be a lot of material going to waste.

As you can imagine, the smaller the Kerf width, the more efficient the cutting process.

Additionally, after cutting, the dimensions of the final piece might be different than what is intended. This can be a deal-breaker for applications that are sensitive to minute changes in dimensions. Therefore, considering the kerf is important for not only waterjet cutting but also any other cutting technology as well. When creating high accuracy parts isn’t a necessity and an inch here and there won’t matter, the kerf is not something you need to care about. You can even use guesswork to compensate for the kerf for low precision requirements. However, when it comes to precision manufacturing, calculating the Kerf is indispensable.

What is the average kerf width in waterjet cutting?

In general, the kerf in waterjet cutting turns out to be somewhere between 0.03 inches to 0.04 inches. This figure is significantly smaller than other cutting alternatives, mainly because waterjet cutting utilizes a very thin stream of pressurized water.

How to calculate kerf for your water jet machine?

Calculating the kerf for your waterjet machine is a very easy process:

1. To start with, all you need is a small sample piece of a known dimension, such as a one-inch square steel piece.
2. Them, cut this piece in half with your water jet cutter and measure the length of the final pieces added together. They will add up to something less than one inch, and the difference will be your kerf value.

For instance, if the length of the resultant pieces is 0.49 inches each, the total length becomes 0.98 inches. Therefore, the kerf value becomes 0.02 inches. Once you have calculated the kerf, you can adjust the length of the workpiece to create the desired final piece. If you want two pieces of one-inch length each, add 0.02 inches on the initial workpiece to compensate for the kerf. The good thing is that most waterjet controllers can compensate for the Kerf width automatically!

**Important Tip: Due to the Kerf you will also need to take into account the tool offset. The tool offset is the shift in the position of the cutter to create the cut in the intended place, taking into account the kerf of the cutting process.

Mathematical Expression

Mathematically, suppose the length of the initial workpiece is X. After cutting, the length of the final pieces is Y and Z. The Kerf (K) will be

K= X- (Y+Z)

I.e. the kerf is the initial length minus the total final length. Since the total final length is always less than the initial length as some material is wasted away in cutting, the Kerf will always be a positive value.

What factors influence kerf in waterjet cutting?

Several factors influence the kerf in waterjet cutting. These factors include:

1. Workpiece Material – The material that you are cutting will always influence the kerf since different materials have different mechanical strengths and properties. When cutting new material with your waterjet cutter, you should calculate the kerf for that material beforehand with the process mentioned in the previous section.
2. Nozzle Head – The nozzle head determines the width of the water jet that will create the cutting action. If you are using a thin nozzle, the kerf will be lower. Additionally, a worn-out nozzle head will lead to a higher kerf than a brand new nozzle.
3. Cut Design – When cutting in a straight line, the kerf is smaller as compared to cutting corners or creating circular cuts. This is because the machine slows down the cutting speed at corners, leading to a  higher kerf value there. In straight cuts, the cutting speed is high leading to lower kerf value.
4. Abrasive – Some people believe that by using pure waterjet cutting they can lower the Kerf value than abrasive waterjet cutting. However, abrasive waterjet cutting has a lower kerf than pure waterjet cutting since the former can provide more force with a thinner stream. Additionally, higher-quality abrasives provide lower kerf value.
5. Waterjet Pressure – By using higher water pressure, you can narrow down the thickness of the water stream required to create the cutting action. This will result in a smaller kerf value.

How does waterjet kerf compare to other cutting methods?

Water jet cutting is a mechanical cutting technology as opposed to thermal cutting methods such as laser cutting, plasma cutting, EDM cutting, and Oxy-fuel cutting. The thermal cutting methods rely on creating the cutting action by melting the material at the point of impact. The melting takes place not only on the point of impact but also on the adjacent areas due to the thermal conductivity of the material. However, since waterjet cutting is a cold cutting process, the kerf is limited only to the point of impact. This means that the kerf involved in water jet cutting will always be lower than these other methods. Here is a table of typical kerf width for various cutting processes:

Kerf Width (inches)

• Waterjet Cutting ~0.035
• Plasma Cutting ~0.150
• Oxy-fuel Cutting ~0.045
• Laser Cutting ~0.030

Conclusion

A waterjet cutter is an optimal choice for any manufacturer who wants to make precise cuts while preserving the integrity of the material. However, to ensure precision, you will always need to take the waterjet cutting kerf into account. By compensating for the Kerf, you can make the final pieces as per the intended dimensions.

One thing to remember is that some Kerf is involved regardless of which cutting method you choose. The advantage of waterjet cutting is that it involves a Kerf lower than other cutting processes. I

If you are considering waterjet cutters for your business, it is a good idea to browse our range of CNC water jet cutters. TechniWaterjet has very reliable, professional-grade waterjet cutters that can handle whatever you throw at them.

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