What is the axis?
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The shaft is one of the very important elements used in the machine. They are used to support rotating parts such as pulleys and gears, which are supported by bearings located in rigid machine housings. Gears and pulleys on the shaft help transmit motion. Many other rotating elements are keyed to the shaft. They are subjected to bending moments and torsional moments due to the reaction forces of the members supported by the shafts and the torque generated by the power transmission. Shafts always have a circular cross-section and can be hollow or solid.
Features of shaft parts
1. Shaft parts are characterized by rotating body parts, whose length is greater than the diameter, and are generally composed of the outer cylindrical surface, conical surface, inner hole, thread and corresponding end surface of the concentric shaft.
2. According to different structural shapes, shaft parts can be divided into optical shaft, stepped shaft, hollow shaft and crankshaft. When processing, attention should be paid to the surface roughness of the parts, mutual position accuracy, geometric shape accuracy, ruler accuracy, etc.
Basic machining route of shaft parts
The main machining surfaces of shaft parts are the outer circular surface and the common special-shaped surface, so the most suitable machining method should be selected for various accuracy grades and surface roughness requirements. Its basic processing routes can be summarized into four.
1. The processing route from rough turning to semi-finishing turning to finishing turning is also the most important process route selected for the needle outer circle machining of shaft parts of commonly used materials.
2. From rough turning to semi-finishing, to rough grinding, and finally to fine grinding, the processing route requires high precision for ferrous materials, small surface roughness requirements and parts that need to be hardened. is the best choice because grinding is its most ideal follow-up process.
3. From rough turning to semi-finishing turning to fine turning and diamond turning, this processing route is specially used to process non-ferrous metal materials. Because non-ferrous metals have low hardness, it is easy to block the gaps between sand grains. It is easy to obtain the required surface roughness, and the finishing and diamond turning processes must be used; the last processing route is from rough turning to semi-finishing, and then to rough grinding and fine grinding.
4. Finishing processing. This route is a processing route that is often used for parts that have been hardened for ferrous metal materials, and have high requirements on precision and low surface roughness values.
Turning Technology of Shaft Parts
1. Lathe tool post shaft machining
When the processed parts are batch or single-piece production, the process route is: forging, normalizing, rough turning, large end diameter and end face, drilling center hole, rough turning, small end diameter and end face, drilling center hole, fine turning, and outer surface. Circular and end face all grooves - threading - turning plane craft groove - acceptance - pliers drilling - acceptance - cylindrical grinding - acceptance - blackening - storage.
2. Analysis of turning process program
(1) The blanks used in mass production are die forgings, and their advantages are mainly high forging accuracy. The machining allowance is small, but the uneven structure and the appearance are produced.
A hard layer appears on the surface. In order to improve the cutting performance, normalizing is invited. If it is a single piece production, the raw material is directly used as bar material, but the machining allowance is relatively small.
Large, it will affect production efficiency and material utilization.
(2) The third process is to turn the end face first, then drill the center hole, and then use the top support to wait for turning the outer circle, which is conducive to the firm installation and improved performance.
The amount of cutting can ensure the coaxiality of one end.
(3) The seventh process is that the precision and roughness requirements are guaranteed by grinding for the positioning of the measuring center.
3. Processing of steering knuckle shaft
(1) Processing route
Forging, normalizing, scribing, drilling center hole, rough turning, outer circle, threading, fine turning, outer circle, acceptance, scribing, planing, gear opening, rough and fine turning, coarse and fine turning, tapered hole, plug-in slot, and drilling One tapping, one acceptance, one storage.
(2) Step analysis of scribing method
First, according to the blank allowance of each processing part, mark the position of the center hole at both ends of the shaft end, and drill the center hole, and use the two-center clamping method to rough and finish the outer circle of each gear of the shaft end. Then use this journal as the benchmark to draw the line with the auxiliary speed.
A custom-made shaft is a rod-shaped or cylindrical component that generates linear motion in different applications. Shafts are basic components of various machines where linear motion is crucial and precision is key. There are different types of precision shafts, each with unique features and capabilities. Each of these rod-shaped devices must be manufactured with ultra-fine tolerances and can withstand unique loads, survive harsh environments, and operate at preferred speeds. Consequently, it ensures that your machines or equipment moves smoothly and accurately.
Various industries rely on custom-made shafts since most machines used in these industries possess these components (shafts). Hence manufacturing these customized shafts with the highest degree of accuracy, concentricity, hardness, and surface finish is critical to their fit and function, ensuring the optimal linear motion performance and overall operating conditions. It is crucial to machine a custom shaft accurately because machined shafts that are not within the required tolerance will experience complications like runouts, which will adversely affect the quality of the machinery.
Custom shaft machining involves a series of steps that help to fabricate precise shafts with the desired dimensions, tolerances, and surface finishes. However, identifying the intended application, operating conditions, and project requirements to produce precise and functional machined shafts is advisable. We’ll discuss basic steps on how to process custom machined shafts in this section:
The first step of the custom shaft manufacturing process is to make a detailed design program considering the alignment, torque, and environmental conditions. It is essential to define the shaft material, length, and diameter specifications. Then, create a CAD (computer-aided design) file for your precision shaft with CAD software.
Using computer-aided manufacturing (CAM) software, you can then create tool paths for the CNC machine based on the machined shaft parts requirements. Create a CNC program (G-code) with CAM software and load it into the CNC machine controller to govern the machining process.
you must choose the best material for the precision shafts machining based on the requirements of the application. Steel, aluminum, titanium, and brass are common materials engineers use to manufacture shafts depending on variables such as cost, tensile strength, and corrosion resistance.
CNC machine setup comes next in the custom shaft manufacturing process. You have to choose the right machine type including a lathe or milling machine when setting up a CNC machine to fabricate custom shafts. Then, prepare the workpiece raw material and pick the appropriate CNC tool. Also, ensure the workpiece is fastened firmly with the appropriate fixtures and ensure the edges of the cutting tools are sharp.
There are various surface finish treatments compatible with custom machined shafts. These finishing treatments help enhance the physical aesthetics and functionality of these machined shafts, ensuring they fulfill the requirements of the intended applications. Typical surface finish treatments suitable for enhancing custom shafts include polishing, bead blasting, electroplating, and anodizing.
Measure the custom shafts’ dimensions with precision measuring tools like micrometers, gauges, or calipers to confirm the shaft meets the required tolerance range.
Different custom shafts are available for various industrial machinery and large equipment. Each shaft has varying load capacity, rotational speed, and application. Here are some of the commonly used machined shafts:
Solid Shaft: A single, continuous cylindrical piece of material, such as steel or aluminum, the solid shaft is the simplest and most basic type of shaft. It is commonly used in low-power and low-speed applications like hand tools, home appliances, and small machinery, where its straightforward design and durability make it a reliable choice.
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Hollow Shaft: Also known as a tubular shaft, this type features a hollow, cylindrical design with a central bore running through its length. The hollow construction makes hollow shafts lighter in weight compared to solid shafts, making them suitable for applications where weight reduction is crucial, such as in the automotive and aerospace industries.
Stepped ShaftStepped Shaft: This shaft design incorporates two or more diameters along its length, allowing it to accommodate various components like bearings, gears, or pulleys that need to be mounted on the shaft. The stepped configuration provides a way to transition between different component sizes, making it a common feature in mechanical power transmission systems.
Tapered Shaft with KnurlingTapered Shaft: The tapered shaft has a gradually decreasing or increasing diameter along its length, enabling a secure fit for components like pulleys or gears that need to be mounted on the shaft. The taper allows these components to be easily slid onto the shaft and then locked in place, often using a keyway or a tapered fit.
Splined Shaft: Splined shafts feature a series of parallel grooves or ridges, called splines, running along its length. These splines allow the shaft to transmit torque and power to connected components, such as gears or couplings, making splined shafts a popular choice in automotive, industrial, and aerospace applications.
Keyed ShaftKeyed Shaft: Keyed shafts often have a flat surface or groove, known as a keyway, running along its length. This keyway provides a secure mounting point for components like pulleys, sprockets, or gears, preventing them from slipping on the shaft. The component is typically held in place by a separate key that fits into both the keyway on the shaft and a corresponding slot in the component.
Precision shaft manufacturers use different innovative techniques to fabricate shafts to preferred tolerances and surface finish. Below are some of the commonly used shaft manufacturing techniques:
CNC milling is a versatile subtractive process that uses a rotary multi-point tool to machine features like splines and keyways on a shaft. The technique involves delivering consistent and precise cuts on the stationary shaft material to shape it into desired shapes.
CNC turning is another common technique machinists use to manufacture shafts. This technique is best suited for machining cylindrical turned parts like custom shafts. Specialized tools cut material from the surface of the shaft as the chucks rotate it. CNC turning creates machined shafts with the required surface finish and diameter precisely to specifications. Most especially, the CNC turning technique is perfect for mass production jobs when you need to machine thousands of shafts as quickly as possible.
CNC drilling is suitable for machining holes and channels across custom shafts, allowing attachment of gears to the shaft. Machinists use this technique to machine grooves of different depths and diameters in these cylindrical components. Drilling is cost-effective and simpler than most machining processes.
The CNC grinding process involves the use of an abrasive spinning wheel to even out the rough surface of a machined shaft, giving it a fine and smoother surface finish. This process allows machinists to manufacture custom shafts that meet the specified tolerances and dimensions. Although this technique doesn’t use a cutting tool, it utilizes a grinding wheel that engages the shaft’s surface to smoothen it.
EDM is a versatile non-traditional machining technique that involves cutting unwanted material from a workpiece by vaporizing. The electric discharge machining technique can make tiny and intricate features on solid machined shafts.
Custom shafts for different applications are made from a wide range of materials, provided they exhibit remarkable strength and can withstand the load of the intended application. Here are some of the common materials used to machine shafts:
Aluminum is one of the widely used lightweight and corrosion-resistant metals. Its higher machinability makes it a suitable choice for different applications where low weight is critical without compromising strength. Aluminum is the perfect material choice for applications that require machined shafts with low weight.
Alloy steel exhibits enhanced material properties including high strength and toughness needed to make precise and durable machined shafts. Typical alloy steel suitable for heavy-duty applications like large industrial motors or machinery are alloy steels 4140 or 4340. Most notably, alloy steels can withstand high-temperature applications.
Carbon steel is an extremely durable metal used in manufacturing custom shafts. Manufacturers prefer it due to its exceptional machinability and tensile strength. Carbon steel alloys are compatible with various heat treatment procedures that enhance their mechanical properties.
Carbon steel is mostly durable even though it is not the best option for aesthetic applications. The 1045 grade is the perfect carbon steel alloy with the ideal strength for applications like pump shafts or motor shafts.
Titanium is a common material product engineers use to machine high-precision shafts. It exhibits a high strength-to-weight ratio and resistance to corrosion. Most notably, titanium is suitable for high-performance applications like custom shaft manufacturing for the aerospace sector due to its extreme strength.
Nickel alloys offer high-temperature strength and excellent resistance to corrosion. Due to their unique combination of properties, these alloys are well-suited for manufacturing shafts for the most exacting applications. Inconel 600 and 800 are common nickel alloy examples suitable for manufacturing custom shafts used in high-temperature applications like turbines.
Stainless steel is a highly adaptable material suitable for manufacturing custom shafts. Its corrosion resistance property makes it the perfect material for different applications. For example, 304 and 316 stainless steel provide high resistance to corrosion. As such, they find use in applications with high exposure to corrosive elements like seawater and chemical processing plants.
The surface finish compatible with a custom machined shaft depends on its intended application. Product engineers often use these surface finish options to enhance the performance of machined shafts and increase their corrosion and wear resistance. Here are common surface finish options suitable for custom shafts:
Bead blasting is a reliable surface finish option that involves the release of steel beads or fine glass at high pressure to smoothen the surface of machined shafts. The bead blast finish cleans the surface of the shafts giving it a dull or satin appearance.
This surface finish option is one of the most used options. It is mostly perfect for finishing aluminum machined shafts. It creates a hard, corrosion-resistant coating on the custom shaft’s surface, improving its aesthetic appeal and resistant to corrosive elements. Furthermore, anodized shafts allow the addition of vibrant colors.
Polishing as a surface treatment helps to prevent the surface of machined shafts from contamination and oxidation. The process involves using an abrasive material to remove nicks from the surface of the shafts, improving the reflective properties and its corrosion resistance.
Chrome plating creates a thin chromium coating on the machined shaft, enhancing its hardness and resistance to corrosion. This tough and shiny layer of chromium can withstand harsh environments and continuous use without deforming.
Product manufacturers use the passivation finishing treatment to improve the surface of custom stainless steel shafts. The process includes cleaning the shaft with an acid solution, removing free iron compounds and other contaminants from its surface. Hence, a passive oxide coating forms on the surface, protecting it from corrosive substances.
Electroplating is a versatile surface finishing option manufacturers use to improve the surface of machined shafts. It often involves the deposition of a thin layer of metals like gold, zinc, or nickel on the shaft’s surface. This finishing treatment enhances the shaft’s resistance to corrosion and wear.
To prevent inaccuracies or performance errors such as extreme vibrations and deflections, it would be best to machine the shaft’s length and diameter and other features precisely to the requirements of the intended applications. Maintaining tight tolerances on the machined shaft’s diameter, length, and other critical dimensions ensures the proper fit and function of attached components. More importantly, it would be best to use precise machining techniques, such as CNC turning or grinding, and consult industry standards to determine the appropriate tolerance ranges for the shafts’ dimensions.
Ensure the shaft is properly aligned with the other components in the system to minimize vibrations, wear, and premature failure. Use precision alignment tools and techniques, such as laser alignment, and consider the effects of thermal expansion and other environmental factors that may influence shaft alignment over time.
When machining custom shafts for a particular application, it would be best to determine the expected load and torque these shafts will withstand to ensure they fit and perform properly. Determining the expected load and torque helps to ensure the shaft parts’ reliability and accuracy, preventing cases of failure during operation. Most importantly, it helps to predict the best material and right diameter required to make functional custom shafts.
Perform a thorough stress analysis to identify areas of high-stress concentration and potential failure points. Consider factors like bending, torsional, and axial loads, as well as any stress raisers, and use finite element analysis (FEA) or other engineering software to model the shaft’s performance and optimize the design.
Choose the appropriate manufacturing process based on the shaft’s complexity, material, and production volume. Common methods include turning, milling, grinding, and specialized processes like cold rolling or forging. Ensure the manufacturing process maintains the required dimensional accuracy, surface finish, and metallurgical properties.
Finishing your custom-machined shaft with compatible surface treatment helps to ensure its extended lifespan and improved look. You can choose from the various surface finishes compatible with the different shaft types. Custom shafts finished with the right processes offer better corrosion, friction and wear resistance.
It is important to implement effective quality control measures when manufacturing functional shafts. Consistent in-process inspections and testing help to ensure the shafts are machined precisely to the required material properties, dimensions, and surface finish. More importantly, it would be best to practice coordinate measuring, surface roughness, and hardness testing during quality control.
Furthermore, consistent quality checks allow effective internal error detection and rectification, ensuring the machined parts meet the desired specifications. Also, maintaining detailed records of the manufacturing process and test results helps to ensure traceability and strict compliance with strict industry standards.
AT-Machining is the right CNC machining expert to contact whenever you need help with your custom shaft manufacturing project. AT Machining is your one-stop CNC machine shop for quality and reliable precision machined shafts. We have machined several custom shafts from various CNC materials ranging from titanium and plastic to steel, with various machining processes.
Our elite team of machinists and engineers leverage our state-of-the-art CNC facility and years of experience in machining your custom shafts precisely to specific diameters and tolerances. We are ISO 9001:2015 AS9100D Certified, trust us to deliver superior quality, built-to-spec shafts that meet stringent quality standards. Submit your CAD file for instant quotes; we can turn your customized shaft design into reality!
Custom shaft manufacturing is an efficient process that involves manufacturing long and cylindrical mechanical engine components exactly to design specifications. There are various machined shafts, each with unique designs and features that match the requirements of respective applications. This guide has provided an in-depth discussion about the different types of shafts and expert tips to elevate your custom shaft manufacturing projects.
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