Omar Khalid
Grinding wheels are abrasive wheels that are typically used for the fast removal of materials and cleaning up welds. They are available in various styles and are used for different grinding tools. The type of grinding wheel to be used depends on the specifications of the project, such as the size and hardness of the contact area, the material being ground, and the wheel speed. When it comes to grinding ABS plastic, it is essential to consider the unique characteristics of this material and choose a grinding wheel that can effectively shape and refine it without causing any damage.
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Grinding wheel grit size
Grinding wheels are tools used in a variety of grinding and machining operations. They are composed of abrasive grains, fiberglass, and bonding chemicals. The abrasive grains are the functional components of the wheel, removing material from the workpiece. The grit size of the wheel is a critical factor in determining its performance.
Grit size measurements generally range from coarse to fine. Coarse grits, typically rated between 12 and 24, are used for rapid stock removal and are suitable for large areas of contact and soft materials. They are commonly used in rough grinding operations, such as those found in steel mills. Coarse grits are also preferred when the neatness of the surface finish is not a priority.
Finer grit sizes, rated above 24, are used for precision grinding and when a superior final finish is required. These grit sizes are commonly employed in operations requiring tight limits on the finished workpiece geometry. Finer grits also require less pressure during application, allowing for a more delicate touch when needed.
The choice between coarse and fine grit sizes depends on the specific application and the material being worked on. For example, when grinding hard materials, finer grit sizes are necessary to achieve the desired results. Conversely, soft materials are best paired with medium to coarse grit sizes.
Additionally, the grit size affects the wheel's performance and longevity. A finer grit size will generally produce a better surface finish but may increase the frequency of dressing, as observed in studies by Rowe (2009) and others. On the other hand, coarser grit sizes offer longer wheel life and faster cutting rates but may result in increased specific energy and thermal-damage risk.
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Wheel shape
Grinding wheels are abrasive wheels capable of taking off material, shaping workpieces, and cutting through metal and stone. They are typically used for angle grinders and power saws.
There are three main types of grinding wheels, each with specific properties and uses: Type 1 Snagging Wheels, Type 27 Grinding Wheels, and Type 28 Grinding Wheels.
Type 1 snagging wheels are straight and have a small diameter of about 2 to 4 inches. They are ideal for removing excess metal with high-speed die grinders. Type 27 grinding wheels are the most common type and have a flat profile with a depressed center. The depression allows for a range of grinding angles, typically from 0 to 45 degrees. Type 28 grinding wheels, also known as saucer wheels, are similar to Type 27 but are optimized for lower grinding angles, typically from 0 to 15 degrees. Their concave design allows for better access to tighter areas and increased aggression at smaller working angles.
The shape of the grinding wheel is determined by the type of abrasive grains used, the bond, and the wheel's construction. The abrasive grains can be made of materials such as aluminum oxide, silicon carbide, or diamond. The bond is the substance that holds the abrasive grains together, and it can be made of materials like shellac, resinoids, rubber, or glass. The construction of the wheel includes the number and arrangement of abrasive grains and the type of bond used.
The choice between a coarse, medium, or fine grit size depends on the material being ground and the desired finish. Coarser grits are suitable for soft materials and rapid stock removal, while finer grits are needed for hard materials and a smoother finish.
The wheel's shape also affects its performance and longevity. A harder bond will extend the wheel's lifespan, while a softer bond allows for smoother grinding and quicker exposure of new grains. The correct bond choice balances performance and durability.
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Abrasive grains
Grinding wheels are composed of abrasive grains and layers of fibreglass bonded into a wheel shape by another substance. The abrasive grains act as the grinding tools, removing material from a workpiece to shape and refine it.
There are four main types of abrasive grains available for grinding wheels:
- Silicon Carbide: This abrasive is the top-performing option for plastic. It removes material without excessive friction, preventing heat buildup. It also maintains a consistent cutting surface, reducing the risk of uneven sanding. Silicon carbide grains are sharper than alternatives, requiring less pressure to achieve the desired effect. This is particularly important when working with softer plastics like ABS, as applying too much pressure can cause deformation. Silicon carbide also resists clogging, as the plastic dust and debris that quickly accumulate on traditional sandpaper, making it less effective over time.
- Aluminum Oxide: While this abrasive is widely used for sanding wood and metal, it is too aggressive for plastic. It cuts too deeply into the surface and creates scratches that are difficult to remove, making it unsuitable for projects requiring a smooth, even finish.
- Emery Cloth: This abrasive is commonly used for sanding metal but is too coarse for plastic, often causing more harm than good.
- Alumina: Alumina-type abrasives are suitable for grinding high-tensile materials such as steel and ferritic cast irons. The more friable types of alumina are preferred for harder steels and applications with large arcs of contact.
When selecting the appropriate abrasive grain for grinding ABS plastic, it is important to consider the specific application and the desired finish. ABS plastic is a common thermoplastic polymer used for both mechanical and electrical purposes. It is strong, stable, and can be processed in various ways, including sanding, painting, gluing, and chemical smoothing. However, ABS plastic is sensitive to heat and UV light, which can cause yellowing and brittleness. Therefore, when choosing an abrasive grain for grinding ABS plastic, it is crucial to consider the heat generation and the potential for surface damage.
Additionally, the grit size of the abrasive grain is a critical factor. For ABS plastic, starting with a coarser grit is recommended if there are heavy imperfections or deep scratches that need to be removed. Progressively finer grits can then be used to achieve a smooth and polished finish. It is important to progress through the grit sizes gradually to avoid visible scratches and imperfections in the final product.
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Wheel bond
The bond of a grinding wheel is the substance that holds the abrasive grains together, acting as a "glue". It must wear away as the grains wear away, exposing new grains over time. There are three principal types of bonds used in conventional grinding wheels: organic or resin, vitrified, and metal. Each bond type has its own unique benefits and is suited to different applications.
Resin bonds are the most widely used bond type in superabrasive grinding wheels. They are made from synthetic resins, such as phenolic or epoxy, which hold the abrasive grains in place. Resin-bonded grinding wheels are used for general metal grinding, deburring, auto body work, removing rust, surface preparation, and rapid stock removal. They offer more compliance than other bond types and can withstand harsh grinding conditions such as vibration and large side forces.
Vitrified bonds are made from a mixture of carefully selected clays. At high temperatures, the clays and abrasive grains fuse into a molten glass condition. During cooling, the glass forms a span that attaches each grain to its neighbour, supporting the grains while they grind. Vitrified bonds provide excellent dressability and free-cutting behaviour when precision grinding ferrous materials such as hardened steel or nickel-based alloys. They are also ideal for high-volume production grinding applications of hard materials.
Metal bonds are the hardest of the bond types and are usually made with diamond, the hardest superabrasive. They offer excellent wear resistance and form-holding ability. Metal bond wheels are used on especially hard materials such as glass, ceramics, and carbides, and they generate the highest grinding forces.
Other less common bond types include shellac, rubber, glass or glass-ceramic, and hybrid bonds. Hybrid bonds are custom-formulated to possess unique characteristics that will better support specific needs. A grinding wheel expert can help you select the right bond type for your application.
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Wheel speed
When selecting a grinding wheel, it is important to consider the wheel speed, which will determine the bond type required. The bond is the substance that causes the abrasive grains to adhere to the wheel. Common materials used for bonds include shellac, resinoids, rubber, glass, and glass-ceramic.
The speed of a grinding wheel is marked on every large wheel (above 80mm in diameter) in two ways: the peripheral surface speed, given in metres per second, and the rotational speed, given in revolutions per minute. For smaller grinding wheels (below 80mm in diameter), the maximum operating speed is provided separately and must be stored alongside the wheel.
For surface speeds of 8500 SFPM (43 M/s) and below, either a vitrified or an organic bond can be used. Most common vitrified wheels are designed for 6500 SFPM (33 M/s) and lower. For surface speeds over 8500 SFPM (43 M/s), an organic bond is usually recommended for safety reasons. However, some newer vitrified bonds can run at speeds above 8500 SFPM, but they typically require a special rating.
The wheel's speed will also affect its performance. At higher speeds, there is lower force per abrasive particle, making the grain and bond more durable and resistant to breakdown. Conversely, at slower speeds, there is a higher force per particle, causing the grain and bond to break down quicker. This can be influenced by the use of coolants, which affect vitrified and organic (resin) bonded wheels differently. Vitrified wheels will act softer with coolant due to reduced friction, while organic (resin) wheels will act harder as the coolant reduces heat.
When using a grinding wheel on plastic, it is important to consider the material's properties. Plastic can melt at high RPM, so it is recommended to start at low RPM and not exceed the recommended maximum RPM for the specific wheel. For example, the DREMEL® EZ SpeedClic plastic cutting wheel has a maximum RPM of 15,000.
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Frequently asked questions
Grinding wheels are abrasive wheels that are used to quickly remove material, shape workpieces, sharpen blades, and cut through metal and stone. They are formed into a wheel shape by bonding abrasive grains with substances like shellac, resinoids, rubber, glass, or fiberglass.
When choosing a grinding wheel for ABS plastic, consider the hardness of the plastic, the grit size, and the type of abrasive material. Softer plastics are typically ground with medium to coarse grit size wheels, while harder plastics may require finer grit sizes.
Common abrasive materials used in grinding wheels for plastics include silicon carbide and blends of aluminum oxide with silicon carbide. These abrasive grains are designed to grind soft metals and plastics effectively without causing damage due to heat or pressure.
Yes, there are various types of grinding wheels available, such as Type 1 straight wheels, Type 27 depressed-center wheels, and Type 28 saucer wheels. The choice of wheel type depends on the specific application and the angles at which you need to work.
