1. The transmission efficiency is different. The transmission efficiency of the ball screw is as high as 90~96%, while the transmission efficiency of the ordinary screw is about 26~46%. That is to say, under the same size of complexity, the ball screw can use a smaller driving power, which can effectively reduce production costs, reduce losses, and increase more benefits for the enterprise. 2. The transmission speed is different. The ball screw is rolling friction, and the ordinary screw is sliding friction. When the transmission is running, the temperature rise of the former is much lower than that of the latter. The ball screw can undertake high-speed transmission tasks. 3. The precision is different. The friction coefficient of the ball screw can be 0, but the ordinary screw directly increases the force at both ends of the sample through linear motion, so it has a certain sliding friction coefficient. Compared with the ball screw, the precision and efficiency are relatively low. 4. The service life is different. The surface friction of the ball rolling friction is small. Under the premise of reasonable operation of various cleaning and maintenance, the service life of the ball screw is longer than that of the ordinary screw. 5. Difference in self-locking property. Ball screws have almost no self-locking property and have reversibility of transmission; while ordinary screws have self-locking property. 6. Difference in economic efficiency. Ball screws are more complicated than ordinary screws, but they are also better, so the price of ball screws is a little higher than that of ordinary screws. In general, ball screws and ordinary screws have their own advantages and disadvantages, but ball screws are better than ordinary screws in terms of transmission efficiency, transmission speed, accuracy, load, life, etc., so they are more suitable for use in linear slide modules.

Preload adjustment of ball screws is a key step to ensure their high precision, high rigidity and long life. The role of preload is to eliminate the gap between the ball and the raceway, reduce the reverse clearance (backlash), and improve the axial rigidity and vibration resistance of the system. However, excessive preload may cause heating, increased wear and even jamming, so the adjustment must strictly follow the technical specifications. The following are the detailed methods and precautions for preload adjustment: 1. Purpose of preload adjustment Eliminate axial clearance: Ensure that the screw has no empty stroke when moving forward and backward. Improve rigidity: Enhance the system's ability to resist deformation due to load changes. Extend life: Reasonable preload can evenly load the ball and avoid local wear. Reduce vibration and noise: Reduce impact and abnormal noise caused by clearance. 2. Main methods of preload adjustment a. Double nut preload method (most common) Principle: Apply opposite axial forces through two nuts to squeeze the ball into contact with the raceway. Steps: Install double nuts: Install two ball nuts in reverse on the same screw shaft. Apply preload: rotate the two nuts to bring them closer together, compress the elastic element in the middle (such as a disc spring) or directly lock them through the thread. Adjustment method: Torque control method: tighten the nut to the specified torque value with a torque wrench (refer to the manufacturer's data). Displacement control method: measure the distance between the two nuts and adjust to the preset compression amount (usually 1%~3% of the lead). Lock the nut: use a locking washer or thread glue to fix the adjusted position. b. Shim adjustment method Applicable scenarios: single nut structure or occasions where the preload needs to be accurately adjusted. Steps: Add a shim between the nut end face and the mounting seat. Change the axial relative position of the nut and the screw by increasing or decreasing the thickness of the shim, and compress the ball and raceway. The preload needs to be tested repeatedly until the target value is reached. c. Spacer adjustment method Principle: add a spacer (sleeve) of a specific length between the double nuts, and control the preload by changing the length of the spacer. Advantages: High preload accuracy, suitable for equipment with high rigidity requirements (such as CNC machine tools). Steps: Measure the original spacing between the two nuts. Calculate the required spacer length based on the preload amount (usually the required compression amount = spacer length - original spacing). Install the spacer and lock the nut. d. Variable lead method (preload type ball screw) Principle: The manufacturer changes the lead of the ball circulation path to make the ball preload in the nut. Features: Users do not need to adjust, and can obtain standard preload by direct installation (need to select according to the load). 3. Key parameters for preload adjustment Preload level: usually divided into light preload (C0/C1), medium preload (C2/C3), heavy preload (C5), which needs to be selected according to the load and accuracy requirements. Preload amount calculation: Preload amount ≈ 0.05~0.1 times the elastic deformation corresponding to the rated dynamic load. Empirical formula: preload = (5%~10%) × lead (refer to the manufacturer's manual). Preload detection indicators: Axial rigidity: The displacement after applying external force must be less than the allowable value (such as 1μm/N). Reverse clearance: measured with a micrometer, the target value is usually ≤5μm. IV. Detection and verification after adjustment Torque test: Manually rotate the screw to feel whether the resistance is uniform and avoid local jamming. Use a torque meter to measure the driving torque and compare it with the manufacturer's recommended range (re-adjustment is required if it exceeds the limit). Reverse clearance detection: Fix the micrometer contact to the nut, move the screw in the forward and reverse directions, and record the displacement difference. Temperature monitoring: Run without load for 30 minutes to check whether the temperature rise is normal (generally ≤40℃). V. Precautions Avoid over-preloading: Excessive preloading will cause a sharp increase in friction heat, accelerated wear and even sintering. Lubrication management: After preload adjustment, it is necessary to add an appropriate amount of grease. It is recommended to use high-speed and high-load lubricants. Environmental adaptability: The preload amount needs to be re-checked in high or low temperature environments (affected by the thermal expansion coefficient of the material). Regular maintenance: Check the preload status every 300-500 hours of operation and readjust it if necessary. VI. Common problems and solutions Problem 1: Large running resistance after preload adjustment Cause: Excessive preload or insufficient lubrication. Solution: Reduce the thickness of the gasket or the length of the spacer sleeve and increase lubrication. Problem 2: The reverse clearance still exceeds the standard Cause: The nut is worn or the screw shaft is bent. Solution: Replace the nut, straighten the screw or replace a new screw. Problem 3: Abnormal noise and vibration Cause: Uneven preload or broken balls. Solution: Readjust the preload and check the ball circulation system. Through the above understanding of ball screw preload, if you want to learn more, please contact us, we are online 24 hours a day to serve you.

If you’re running a CNC machine, you know the ball screw is the heart of its motion system. It directly impacts precision, speed, and long-term reliability. For years, Hiwin ball screws have been a go-to choice—but today, there’s a high-quality, cost-effective alternative that delivers the same level of performance: Shuntai C3/C5 precision ball screws. In this post, we’ll break down why these ball screws are the ideal replacement for your CNC machine, their key features, and how they can boost your operational efficiency. Why Your CNC Machine Needs a High-Quality Ball Screw A ball screw converts rotational motion into linear motion with minimal friction, making it critical for CNC machines that demand tight tolerances and consistent performance. Over time, wear and tear on your existing ball screw can lead to: • Lost positioning accuracy, ruining workpieces • Slow or unstable motion that slows down production • Increased maintenance costs and downtime That’s where a reliable replacement like Shuntai’s C3/C5 ball screws comes in. Introducing Shuntai C3/C5 Precision Ball Screws: Built to Match Hiwin’s Standards Designed as a drop-in replacement for Hiwin C3 and C5 grade ball screws, Shuntai’s precision ball screws deliver the same high performance you expect—with added benefits tailored for industrial CNC applications. Feature Details Brand Shuntai Material GCr15 bearing steel (high-strength, wear-resistant) Manufacturing Process Both rolled and ground screw options available Precision Grades C3 / C5 (ideal for high-precision CNC machining) Nut Design Double-nut structure (eliminates backlash, improves rigidity) Lead Time 7-day fast delivery Shipping Port Shanghai (worldwide shipping available) The Advantages of Double-Nut Ball Screws One standout feature of Shuntai’s ball screws is their double-nut design, which solves a common pain point in CNC operations: backlash. Here’s how it works: • Zero Backlash: The two nuts are preloaded to eliminate play, ensuring precise bidirectional motion control. • High Rigidity: The double-nut structure distributes loads evenly, boosting the system’s ability to handle heavy workloads without deflection. • Longer Service Life: With reduced wear on individual components, these ball screws maintain their performance far longer than standard single-nut designs. 5 Core Benefits for Your CNC Machine 1.Micron-Level Precision Built to C3/C5 accuracy standards, these ball screws deliver consistent positioning accuracy, even in high-volume production runs. You’ll see fewer scrapped parts and tighter tolerances across every job. 2.Smooth High-Speed Motion Thanks to rolling ball bearings (instead of sliding friction), Shuntai ball screws operate with minimal resistance. This means faster traverse speeds, smoother cuts, and reduced motor load. 3.Heavy Load Capacity The robust GCr15 steel construction and optimized load distribution let these screws handle the high forces of milling, drilling, and tapping operations—without sacrificing stability. 4.Exceptional Durability Heat-treated and surface-finished for maximum wear resistance, these ball screws stand up to years of continuous use. They resist corrosion and fatigue, reducing the need for frequent replacements. 5.Cost-Effective Performance As a direct replacement for Hiwin ball screws, Shuntai models offer the same reliability and precision at a more competitive price point. You get industrial-grade quality without overspending. Who Is This Ball Screw For? Shuntai C3/C5 precision ball screws are perfect for: • CNC milling machines, lathes, and routers • Industrial automation equipment requiring linear motion control • Workshops and factories looking to upgrade aging machinery • Businesses seeking a reliable, cost-effective alternative to premium brands Ready to Upgrade Your CNC Machine? If you’re tired of inconsistent performance, frequent maintenance, or overpaying for replacement ball screws, Shuntai’s C3/C5 precision ball screws are the solution you’ve been looking for. ✅ Drop-in replacement for Hiwin C3/C5 models ✅ 7-day fast delivery to keep your production on track ✅ Expert support to help you find the right fit for your machine Let’s Talk About Your CNC Needs Ready to learn more about how Shuntai ball screws can improve your CNC machine’s performance? Get in touch with our team today to discuss your requirements, get a custom quote, or ask about our full range of linear motion solutions.