Home / News & Blog / Abrasive Blog / Tips for Choosing the Right Grit Size for Your Grinding Wheels
Grinding wheels are indispensable tools in modern manufacturing and construction, used for shaping, cutting, and polishing a vast range of materials. Composed of abrasive particles bonded by materials like resin, vitrified ceramic, or metal, these versatile tools serve applications requiring precision, durability, and adaptability. Whether for heavy material removal or fine surface finishing, grinding wheels enable efficiency and accuracy in industries such as automotive, aerospace, construction, and beyond. As a professional abrasive manufacturer with more than 30 years of experience, DOMILL can provide different abrasive grit sizes for different grinding wheel types, as detailed below.
Types Based on Abrasive Materials
1. Ceramic Grinding Wheels
Ceramic grinding wheels use ceramic binders, which are inorganic substances with stable chemical properties, good heat resistance, corrosion resistance, and high porosity. They are mainly used for grinding materials with higher hardness, such as hard alloys, diamonds, and other high-hardness and brittle materials. They are loaded on cylindrical grinders, surface grinders, etc., and coolant is added when they rotate at high speed. They are suitable for rough grinding, semi-finishing grinding, and fine grinding of various metals, as well as grooving and cutting operations.
They are used on occasions that require a lot of heat treatment. In addition to the 200mm-350mm grinding wheel of the grinding machine, which is more common in the circulation market, ceramic grinding wheels are mainly sold to end users, including trapezoidal grinding wheels, forming grinding wheels, slow-feed strong grinding wheels, tool grinding wheels, gear grinding wheels, crankshaft grinding wheels, steel ball grinding wheels, rubber roller grinding wheels, threaded grinding wheels, centerless grinding wheels, slot cleaning wheels, internal grinding wheels, grinding heads, etc. The following is a brief introduction to several types of ceramic grinding wheels:
● Creep Feed Grinding Wheels
Creep Feed Grinding Wheels are a special grinding wheel for high-precision grinding. It is usually used in places with high grinding efficiency and strict precision requirements, such as molds, aircraft engine parts, precision gears, etc. Creep Feed Grinding is a slow, high-feed grinding method that achieves efficient and high-precision processing effects through slow feeding and gradual removal of a large amount of material. Creep Feed Power Grinding Wheel has a very soft hardness and loose structure, generally 10-12. Creep Feed Power Grinding Wheel is conducive to the removal of grinding chips during grinding, avoiding clogging of the grinding wheel surface, making it easier to cut, and reducing the risk of burns. It is often used in the grinding of tenon teeth of aircraft engine blades and turbine blades, the shaping grinding of corrugated roller grooves, and the large feed grinding of machine tool guide rails. The common outer diameter is 280-600mm, and the common particle size is F46-F80.
● Tool Grinding Wheels
Tool grinding wheels are specially used for grinding precision tools such as knives, drills, and milling cutters. They are mainly used in tool grinders. To meet the needs of precision machining, this type of grinding wheel usually uses materials with high abrasive hardness, good wear resistance, and moderate particle size. Tool grinding wheels are used in large quantities, mainly including parallel grinding wheels (1 or 1-C), cup grinding wheels (6), bowl grinding wheels (11), and disc-shaped No. 1 grinding wheels (12a). They are usually used for grinding milling cutters, reamer reamers, broaches, paper cutters, tobacco cutters, gear shaping cutters, sharpening milling cutters, and other tools. Common outer diameters: parallel grinding wheels 100-350mm, cup type 40-500mm, bowl type 50-300mm, and disc type 75-800mm. Common particle sizes are F46-F180.
● Crankshaft Grinding Wheels
Crankshaft grinding wheels are special grinding wheels used for grinding engine crankshafts. As a key component of the engine, the crankshaft has multiple journals and complex geometric shapes, which require high-precision processing and high surface finish. Therefore, the crankshaft grinding wheel needs to have high grinding efficiency, good heat dissipation, and wear resistance to avoid overheating and deformation and ensure processing accuracy. Crankshaft grinding wheels include parallel grinding wheels, single-sided empty knife grooves, double-sided empty knife grooves, grinding wheels with heat dissipation grooves, and sandwich grinding wheels (sandwich grinding wheels). The grinding wheels can maintain the shaft strength R angle accuracy and roughness requirements during the grinding process. Common outer diameters are 600-1600mm, and particle sizes are F46-F60.
● Grinding Ball Wheels
The steel ball grinding wheels are grinding wheels specially used for grinding steel balls (such as bearing steel balls).
The steel balls need to achieve very high precision and surface finish, so the grinding wheel for grinding steel balls must have high hardness, good grinding sharpness, and wear resistance. In addition, during the grinding of steel balls, the grinding wheel must maintain a stable shape to avoid deformation caused by the grinding force affecting the accuracy of the workpiece.
The steel ball grinding wheel has a fine grain size, high hardness, and high density. It is mainly used for the hard grinding of steel balls. It is suitable for grinding various types of bearing steel balls, carbon steel balls, and stainless steel balls. It has high compressive strength, high durability, and good grinding performance. The common outer diameter is 400-1000mm, and the common grain size is F180-F400.
● Centerless Grinding Wheels
Centerless grinding wheels are a special grinding wheel for centerless grinding machines, suitable for outer diameter grinding of cylindrical workpieces. Centerless grinding is an efficient and highly automated grinding method. Through the joint action of the grinding wheel, guide wheel, and support plate, the workpiece can be quickly and precisely processed. It is particularly suitable for grinding precision parts produced in large quantities, such as bearings, auto parts, cylinders, etc. It is suitable for products such as inner and outer rings of bearings, bearing cylinders, piston pins, shock absorber outer tubes, valve wires, etc. It has uniform organization and good balance performance, and the maximum thickness can reach 400mm. The common outer diameter is 300-750mm, and the common particle size is F60 and F80.
2. Resin Grinding Wheels
Grinding wheels made of resins such as phenolic, epoxy, polyurethane, polyvinyl alcohol, etc. are resin grinding wheels. They have high strength and can be reinforced with fiber mesh and steel bars, such as cutting discs and grinding discs (mostly resin sheets). Most resin grinding wheels are not waterproof and cannot be ground with grinding fluid. Of course, there are some resin grinding wheels that need to be ground with grinding fluid, such as epoxy. The grinding finish of resin grinding wheels is good and the workpiece is not easy to burn. In addition to some rough grinding wheels that can be seen in the circulation market, most resin grinding wheels are also used by end users. The main products include large-diameter cutting grinding wheels, roller grinding wheels, heavy-duty grinding wheels, precision grinding wheels, rail grinding wheels, etc.
● Large Diameter High-Speed Resin Cutting Wheels
A large-diameter high-speed resin cutting wheel is a wheel designed for cutting large pieces of high-hardness metals. The maximum diameter can be produced to 1600mm and the maximum speed can reach 100m/s. Steel mills usually use large automatic cutting equipment with large-diameter resin grinding wheels to cut round steel. These cutting wheels are widely used in the segmentation, blanking preparation, and length adjustment of square steel, angle steel, and large pipes, and can be used for hot cutting and cold cutting.
● Roller Grinding Wheels
Roller grinding wheels are special grinding wheels used for grinding rollers. Roller is a key component used in steel and metal processing. It is used to press and shape steel through its precise surface finish and high hardness. Roller grinding wheels are used to regularly process the surface of the roller to remove wear and defects and maintain the precise size and surface quality of the roller. It is suitable for roller dressing, polishing, and restoring the ideal shape of the roller. It can be used for rough and precision grinding of hot rollers, cold rollers, and support rollers. It is suitable for grinding rollers of different materials such as stainless steel sheets and aluminum foil. Common outer diameters are 400-1060mm, and common particle sizes are F46-F400.
● Heavy-Duty Grinding Wheels
Heavy-duty grinding wheels are designed for processing high-strength, thick, or hard materials. This type of grinding wheel is suitable for long-term and high-pressure grinding environments and is widely used in heavy industrial fields such as metallurgy, machining, and metal casting. Heavy-duty grinding wheels are designed to withstand large loads and friction, ensuring good grinding performance and service life under high loads. Resin-bonded high-speed heavy-duty grinding wheels are made of calcined brown corundum and zirconium corundum. They are mainly used in the steel industry to grind steel ingots, billets, steel plates, etc., and remove surface oxide scales. They can adapt to heavy-duty grinding of stainless steel, alloy steel, high-speed steel, bearing steel, and other steels. Common outer diameters are 610mm, 760mm, and 915mm, and common particle sizes are F8-F36.
● Precision Grinding Wheels
Precision grinding wheels are mainly used for fine grinding, super fine grinding, and mirror grinding of rollers, shock absorber outer tubes, piston pins, bearing cylinders, etc. The grinding finish is required to be high. The particle size of the grinding wheel is generally F400 or finer, and the uniformity of the grinding wheel must be good. Common outer diameters are 500mm, 600mm, and 910mm, and common particle sizes are F400-F600.
● Rail Grinding Wheels
Rail grinding wheels, also called cup grinding wheels for a profile grinder, are usually bolt-fastened grinding wheels. They are used in internal combustion or electric rail-cutting machines as rail-cutting or grinding wheels. They are required to have high strength, good grinding effect, low consumption, durability, and no damage to the rails. Common outer diameters are 125mm, 150mm, 180mm, 250mm, and 260mm, etc. Common particle sizes are as follows:
Coarse grain size: F16, F24, F30, suitable for grinding severely worn rail surfaces or welded parts, capable of quickly removing material.
Medium grain size: F36, F46, F60, suitable for general rail surface treatment and weld finishing, used to remove uneven surfaces and lighter wear.
Fine grain size: F80, F100, F120, suitable for fine finishing and polishing, providing a smoother surface effect.
3. Magnesium Oxide Grinding Wheels
Magnesium oxide grinding wheels (also known as magnesium oxide grinding wheels) are made of magnesia as a binder and white corundum, brown corundum, and other abrasives. This kind of grinding wheel is specially used for grinding tools. When grinding, it has good self-sharpening, high grinding efficiency, and a good anti-burn effect. It is especially suitable for grinding razor blades, scissors, paper cutters, woodworking knives, and other tools. Common diameters are 150mm, 175mm, 200mm, 250mm, and 300mm. Common shapes include flat, cylindrical, and cup-shaped. Common particle sizes are as follows:
Coarse Grit: F16-F30, for heavy-duty cutting and removal of large amounts of material, suitable for rough grinding.
Medium Grit: F36-F80, for general use, suitable for semi-fine and fine grinding, moderate cutting performance, and surface finish.
Fine grit: F100-F180, suitable for precision machining, the most common grit range for sharpening shears and knives, provides a higher surface finish.
Ultra-fine grit (F220-F400 and above): mainly used for ultra-fine grinding or polishing, where surface quality requirements.
4. Rubber Grinding Wheels
Rubber grinding wheels are a type of grinding wheel that uses rubber as a binder to bond abrasives. They are widely used for fine grinding and polishing of metals, glass, ceramics, and other materials. Compared with other types of grinding wheels, rubber grinding wheels have certain flexibility and elasticity, and are suitable for precision machining, especially in machining scenarios that require high surface finish.
The main applications of rubber grinding wheels include optical glass polishing, grinding of cemented carbide and high-hardness materials, precision machining of tools and cutters, precision bearing and component machining, dressing and deburring, etc. The particle size of rubber grinding wheels is generally finer, and the common particle size range includes:
Coarse grit: F36, F46, for medium-precision grinding.
Medium grit: F60, F80, F120, for general fine grinding and deburring.
Fine grit: F150, F180, F240, F320, for polishing or ultra-precision grinding.
5. PVA Grinding Wheels
PVA grinding wheels are flexible grinding wheels made of polyvinyl alcohol (PVA) as a binder and abrasive, with excellent elasticity and grinding performance. PVA grinding wheel is usually used in processes such as polishing, deburring, and surface treatment, especially in cases where high requirements are placed on the surface of the workpiece. Due to its unique material structure, the PVA grinding wheel is widely used in the surface finishing of materials such as metal, glass, ceramics, and plastics.
PVA grinding wheels have a variety of shapes, the most common ones are flat, bowl, cylindrical, grinding head, etc. The particle size of PVA grinding wheels is usually finer, and the common particle size range includes:
Coarse grit: F46, F60, for medium-precision grinding and surface treatment.
Medium grit: F80, F120, suitable for general fine grinding and deburring.
Fine grit: F150, F180, F240, F320, for polishing and ultra-precision grinding, especially in scenes requiring extremely high finish.
6. Superhard Grinding Wheels
Superhard grinding wheels refer to grinding wheels with diamond or CBN as the main abrasives. Due to their high hardness and wear resistance, they are widely used in grinding high-hardness materials. The application of ordinary abrasives in superhard grinding wheels is mainly reflected in the combination with superhard abrasives. On some occasions, the combination of superhard abrasives and ordinary abrasives can optimize grinding performance. This composite method can not only improve the grinding surface quality but also extend the life of the grinding wheel and reduce costs. In some specific processing scenarios, such as precision machining and surface polishing, the combination of ordinary abrasives and superhard abrasives is an ideal grinding solution.
When adding ordinary abrasives to diamond grinding wheels, the particle size range of the ordinary abrasives is usually related to the material of the workpiece to be processed, the grinding stage, and the surface finish requirements. Generally speaking:
Rough grinding stage: use ordinary abrasives of F60-F120;
Semi-fine grinding stage: use ordinary abrasives of F120-F240;
In the fine grinding and polishing stage, ordinary abrasives of F240-F400 or even finer are used.
Grinding wheels are vital tools for cutting, shaping, and polishing materials in industries like automotive and aerospace. The article outlines various types, such as ceramic, resin, and superhard wheels, each tailored for tasks ranging from precision tool grinding to heavy-duty steelwork, emphasizing their adaptability, durability, and industrial significance.
