News - Beining Intelligent Technology (Zhejiang) Co., Ltd

The Ultimate Guide to Bearing Preload: Types, Benefits, and Selection

Learn what bearing preload is, why it's critical for angular contact bearings, and the difference between factory and spring preload. Discover how to select the right preload for optimal rigidity and performance. What is Bearing Preload? Bearing preload is a predetermined axial or radial force applied to eliminate internal clearance, creating a state of controlled "negative clearance." This intentional stress elastically deforms the raceways and rolling elements, locking them together to enhance performance. While standard radial bearings often operate with clearance, angular contact bearings require preload to maintain constant contact between the balls and raceway. Why Use Preload? Key Benefits Applying the correct preload optimizes bearing performance by: 1.Increasing Rigidity: Eliminates play, making assemblies stiffer for machine tool spindles. 2.Improving Accuracy: Ensures high running precision, even with changing loads. 3.Reducing Noise & Vibration: Prevents axial resonance, especially in small electric motors. 4.Preventing Skidding: Optimizes ball spin to reduce sliding friction and wear. Types of Bearing Preload: Factory vs. SpringChoosing the right preload method depends on your application's need for stiffness versus thermal stability. 1. Factory Preload (Built-in)Applied during manufacturing via a calculated axial offset between rings, labeled as Light, Medium, or Heavy. Pros: Extremely high rigidity; ideal for stable operating conditions.Cons: Sensitive to thermal expansion; requires precise mounting.Example: A GMN S6005 C bearing requires 130 N of force to achieve its Medium preload. 2. Spring Preload (External)Uses components like wavy washers or Belleville springs to apply continuous force. Pros: Excellent thermal compensation (force stays constant during shaft elongation); allows for looser housing tolerances.Cons: Less rigid than factory preload.Best For: Applications with significant temperature changes or where cost-effective housing machining is a priority. Feature Factory Preload Spring Preload Rigidity Very High Moderate / Flexible Thermal Compensation Poor Excellent Mounting Complexity High Precision Required More Forgiving How to Select the Right PreloadFollow these steps to choose the optimal preload for your application: 1.Define Requirements: Do you need maximum stiffness (e.g., grinding spindles) or precise positioning under light/variable loads? If yes, preload is necessary.2.Analyze Conditions: Temperature: If the shaft runs hotter than the housing, a back-to-back (DB) arrangement is less sensitive to thermal growth than a face-to-face (DF) setup.Speed: Spring preload is common for high speeds but verify it meets stiffness needs.3.Calculate Force (for Springs): Use the empirical formula to estimate the required preload force: F = k × d Where: F = Force (kN), d = Bore Diameter (mm), k = Factor (0.005–0.01 for motors; 0.02 for anti-vibration). Conclusion Proper bearing preload is essential for high-precision performance. Use Factory Preload for maximum rigidity and Spring Preload for superior thermal stability. Always validate your selection through testing to account for real-world operating conditions.

2026

05/06

Optimizing Machine Tools: A Guide to Angular Contact Bearing Arrangements

2026

04/20

How to Install Cross Roller Bearings: A Comprehensive Guide

Cross roller bearings are precision components where cylindrical rollers are arranged perpendicularly in 90-degree V-shaped grooves. This unique design not only reduces bearing size but also enables them to withstand loads from multiple directions—radial, axial, and moment loads—offering high rigidity and accuracy. As a common transmission element in robotics and other high-precision equipment, proper installation of cross roller bearings is critical. Incorrect installation can directly impact machine performance. So, how should cross roller bearings be installed correctly? Step-by-Step Installation Guide for Cross Roller Bearings 1.Prepare the Mounting Surface: Thoroughly clean the bearing housing or mounting seat. Ensure all burrs, sharp edges, and contaminants are removed, as these can affect the fit and alignment of the bearing. 2.Press the Bearing In Place: Cross roller bearings typically have a thin-wall structure and are prone to tilting during installation. To prevent this, keep the bearing level and use a plastic mallet to tap it evenly around its circumference. Gently press the bearing into the housing until it sits flush against the reference surface. 3.Position the Fixed Flange: Place the fixed flange onto the bearing's outer ring. Gently adjust the flange until its bolt holes align perfectly with the threaded holes in the housing. 4.Insert the Fastening Bolts: Insert the bolts into the holes, taking care not to cross-thread them. When turned by hand, the bolts should rotate smoothly without noticeable resistance. 5.Tighten the Bolts in Sequence: This is a crucial step. Tighten the bolts gradually and in a diagonal pattern, not in a circle. Follow a star sequence over 3 to 4 stages, increasing torque incrementally. This method prevents bearing distortion and ensures even pressure distribution. During tightening, slightly rotate the integrated ring (if applicable) to help align the two halves of a split-type ring. Consequences of Improper Installation Failing to follow the correct installation procedure can lead to several operational issues: 1.Reduced Rotational Accuracy: Errors in mounting surface flatness or coaxiality can cause poor repeatability and diminished machining accuracy of the equipment. 2.Abnormal Heat Generation: The rollers in cross roller bearings are separated by spacers. Improper installation affects load distribution, increases friction, and causes operational temperatures to rise. In severe cases, this can lead to excessive heat and seizure. 3.Vibration and Noise: The line contact design of these bearings makes them sensitive to alignment. Improper installation often results in periodic vibration and noticeable noise during speed changes. Over time, this accelerates fatigue failure and significantly shortens bearing service life. Conclusion Cross roller bearings are compact, high-precision components. Their installation must adhere strictly to standard procedures, paying close attention to detail. After installation, a test run is essential to verify that temperature, noise, and vibration levels are within acceptable limits before putting the equipment into full service. When in doubt, always seek assistance from qualified technical personnel. Beining Technology specializes in manufacturing precision machine tool spindle bearings.

2026

04/13

How to Install Angular Contact Ball Bearings: Importance of Preload for Optimal Performance

2026

04/06

Fixing a Bearing That Won't Fit on a Shaft: Causes & Solutions

Common Causes 1.Overly Tight Fit: Shaft is too large or bearing bore is too small. 2.Poor Installation: Force applied unevenly or at an angle. 3.Damaged Parts: Shaft or bearing is dented, burred, or out-of-round. 4.No Lubrication: High friction from dry surfaces. Proven Solutions (In Order) 1.Use the Right Tools. Press the bearing on using a proper sleeve or adapter that contacts only the inner ring. Never hammer the bearing directly or press on the outer ring. 2.Apply Heat to the Bearing. Heat the bearing to 80–120°C (e.g., in an oil bath) to expand its inner ring. This is the most effective method for tight fits. 3.Lubricate the Shaft. Apply a thin film of assembly paste or light oil to the shaft to reduce friction during the final push. 4.Check Your Measurements. Use a micrometer to verify the actual shaft diameter and bearing bore match the required tolerance. If the Bearing Gets Stuck: Stop immediately. Do not force it. Remove it carefully with a puller. Inspect both parts for scratches or debris, clean them, and restart with the correct method. Prevention Tips Always clean the shaft and bearing before installation. Remove any burrs with a fine file or stone. Have the correct tools and a plan (like heating) ready before you start.

2026

03/31

How to Fix Inner Race Creep in Spherical Roller Bearings: A Complete Guide

Inner race creep (or “slippage”) is a common issue in spherical roller bearing applications, where the inner ring rotates relative to the shaft it’s mounted on. This not only accelerates wear but can also lead to equipment failure, increased downtime, and higher maintenance costs. Understanding the root causes is the first step toward an effective solution. Main Causes of Inner Race Creep Improper Fit: Excessive clearance between the bearing bore and the shaft. Undersized Bearing: Incorrect bearing selection or a bore dimension that does not meet specifications. Shaft Wear or Damage: Worn, corroded, or out-of-tolerance shaft journals. Installation Error: Improper mounting techniques leading to insufficient interference fit. Recommended Repair & Prevention Methods For a reliable, long-term solution, the following methods are recommended: 1. Re-select or Replace the Bearing Replace the inner ring with one of the correct size. Select a new, standard-specification bearing with the proper bore diameter for your application. 2. Repair the Shaft Journal Thermal Spray Coating: Build up the shaft diameter with a metal coating for restoration. Hard Chrome Plating: Increase surface hardness and diameter slightly for better wear resistance and fit. Machining: Re-machine the shaft to a standard, slightly larger size and pair with a correctly sized bearing. 3. Optimize the Fit and Installation Ensure Proper Interference Fit: Follow manufacturer specifications for the correct fit based on load and operating conditions. Use the Thermal Mounting Method: Heat the bearing inner ring to expand it before sliding it onto the shaft. This ensures a tight, uniform fit upon cooling. Use the Cold Mounting Method: Cool the shaft with dry ice or liquid nitrogen to contract it before inserting the bearing. 4. Implement Mechanical Locking Features Locknuts & Adapter Sleeves: Use adapter sleeves with locknuts for shafts with tapered seats, or install locknuts against the inner ring face. Keys & Keyways: Machine a keyway into the shaft and use a key to positively lock the bearing inner ring against rotation. Lock Washers: Utilize standard lock washers (e.g., eccentric locking washers) to secure the bearing position on the shaft. Temporary or Field Expedient Fixes (When Bearing Replacement is Not Immediate) If immediate bearing replacement is not possible, these methods can provide a temporary fix. Note: These are not best practices for long-term reliability. Locknut Fix: Install a locknut against the inner ring face to prevent axial and rotational movement. Lock Plate: Fabricate or use a standard lock plate that bears against the inner ring and is secured to the shaft. Retaining Compound: Clean mating surfaces thoroughly and apply a high-strength, service-temperature-rated anaerobic retaining compound. Important: This can make future disassembly very difficult. Snap Ring: Machine a groove on the shaft and install a snap ring adjacent to the inner ring to prevent axial movement, often used with other methods. Thicker Spacer: Add a precisely machined spacer to increase axial preload within the bearing arrangement, reducing clearance. Key Takeaway Persistent inner race creep indicates a fundamental issue with the fit between the bearing and shaft. The most reliable solution is to correct the root cause: restore the shaft to specification and ensure a proper interference fit using professional mounting techniques. Temporary fixes should only be used to minimize downtime until a proper, permanent repair can be scheduled. Proactive maintenance—including correct bearing selection, proper installation, and routine inspection—is the most effective strategy to prevent inner race creep and ensure maximum bearing service life.

2026

03/27

Water Pump Bearing Failure: Complete Guide

What Happens When a Water Pump Bearing Fails? The water pump bearing is a key part that helps the pump shaft spin smoothly. When it gets damaged, your cooling system can fail. Most problems come from too much pressure, bad lubrication, or dirt getting inside. Main Signs of Bearing Damage: 1.Strange Noises: You may hear grinding, whining, or rumbling sounds from the front of the engine. The sound gets louder when you accelerate. 2.Coolant Leak: Look for green, pink, or orange liquid under your car or near the water pump. A small "weep hole" under the pump will leak when the bearing seal is broken. 3.Engine Overheats: The temperature gauge goes into the red. Steam may come from under the hood. This happens because the broken bearing stops the pump from moving coolant. 4.Loose Pulley: With the engine off, try to wiggle the water pump pulley. If it moves or feels loose, the bearing is likely worn out. Why Do Bearings Fail? 1.Wear and Tear: Bearings naturally wear out over time (usually after 60,000-100,000 miles). 2.Bad Belt Tension: A belt that's too tight puts extra pressure on the bearing. 3.Coolant Leak: Coolant leaking into the bearing washes away its lubricant, causing rust and quick damage. 4.Old Age: The seals and grease inside the bearing dry out and crack over the years. What to Do if You Have a Problem: 1.Stop Driving Immediately. A failed water pump bearing can cause the engine to overheat and lead to very expensive repairs (like a damaged cylinder head). 2.Do Not Ignore Small Leaks or Noises. These are early warnings. Fixing it early is cheaper than replacing an engine. 3.Replace the Entire Pump. Mechanics usually replace the whole water pump assembly, not just the bearing. It's more reliable and often costs about the same in labor. How to Prevent Problems: 1.Change your coolant at the intervals recommended in your car's owner's manual.2.Have your belts checked and adjusted during regular service.3.Listen for new sounds and watch your temperature gauge.4.When replacing a timing belt, it's often a good idea to replace the water pump at the same time since it's already accessible. Need Help? If you notice any of these warning signs, it's time for a check-up. Our technicians can quickly diagnose water pump issues and get your cooling system working safely again. Contact us to schedule an inspection.

2026

03/19

Bearing Seizure: Causes, Prevention and Maintenance Guide

Bearing seizure is a critical fault where bearings get stuck on the shaft during operation, caused by severe friction between rolling elements and raceways due to abnormal stress or wear. It disrupts equipment operation and may damage related components. Below is a simplified analysis of its main causes and practical prevention measures to help reduce downtime and extend bearing life. Main Causes of Bearing Seizure 1. Bearing Quality Defects and Wear Failure Poor bearing quality (material defects, substandard manufacturing) and overuse beyond service life are common causes. These issues lead to premature wear of internal components (e.g., scratches on rolling elements, broken cages), which accelerates overheating and seizure, especially in motor applications. 2. Abnormal Lubrication System Improper lubrication is a core cause of seizure, including insufficient/excessive lubrication, grease aging, and contamination. Excessive grease increases friction and temperature; insufficient lubrication causes dry friction and sintering. Improper oil seal installation also allows contaminants to enter, worsening wear and heat. 3. Installation and Assembly Errors Incorrect installation often leads to seizure, such as improper fit clearance (too loose or tight), overheating bearings during installation, misaligned shafts, or incorrect axial gap adjustment (too small causes jamming; too large increases vibration). 4. Abnormal Load and Operating Conditions Equipment overload, insufficient clearance for shaft thermal expansion, excessive vibration, or rotor-stator rubbing (in motors) all add extra stress to bearings, accelerating fatigue and seizure. Practical Prevention and Maintenance Measures 1. Strict Lubrication Management - Select lubricants suitable for the bearing model, speed, load and environment. - Lubricate regularly in the correct dosage, avoiding insufficient or excessive lubrication. - Keep lubricants clean and replace them regularly to prevent contamination. - Monitor oil quality and level, handling abnormalities promptly. 2. Improve Installation Quality - Follow installation procedures and use professional tools to avoid brute force. - Ensure proper fit clearance between the bearing, shaft and bearing housing. - Check and adjust shaft alignment to avoid misalignment and uneven wear. - Control preload correctly for bearings that require it. 3. Strengthen Operation Monitoring - Monitor bearing temperature; stop the machine if it exceeds 80℃ persistently. - Use vibration analyzers to detect abnormal wear or misalignment. - Pay attention to abnormal noises (squeaking, grinding) which indicate potential seizure. - Establish a regular inspection system to resolve problems early. 4. Optimize Environmental Control - Keep the bearing’s working environment clean. - Install high-quality seals to prevent dust, moisture and corrosion. - Avoid extreme temperatures and take heat dissipation/insulation measures if needed. - Use anti-corrosion measures in harsh environments (e.g., chemical plants). 5. Standardize Maintenance and Upkeep - Formulate and implement a regular maintenance plan. - Replace bearings timely when they reach service life or show defects. - Maintain complete maintenance records for traceability. - Train operators and maintenance staff on proper procedures. Conclusion Bearing seizure is often caused by poor lubrication, installation errors, quality defects or abnormal conditions. By following the above prevention and maintenance measures, enterprises can reduce seizure risks, improve equipment reliability and ensure stable production. For persistent bearing seizure issues or professional support, contact our engineering team for personalized solutions.

2026

03/10

Centrifugal Pump Bearing Failure: Causes, Signs and Fixes

Centrifugal pumps are used in many industries to move liquids. They are hardworking machines, but their bearings can break down over time. Bearings are small but important parts—they reduce friction and help the pump run smoothly. When bearings fail, the pump stops working, which costs time and money. This article explains why centrifugal pump bearings fail, how to spot the signs, and what to do to fix the problem. Why Do Centrifugal Pump Bearings Fail? Most bearing failures are not caused by poor quality. They happen because of simple mistakes in use or maintenance. Here are the most common reasons: 1. Poor Lubrication This is the top cause of bearing failure. Bearings need grease to work well. Grease creates a thin layer between moving parts, so they don’t rub against each other. If you use too little grease, too much grease, or the wrong type, the parts will rub. This makes heat build up, and the bearing wears out fast. 2. Wrong Installation Installing bearings the wrong way can damage them right away. For example, hitting the bearing with a hammer can make small cracks. These cracks get worse when the pump runs, and eventually the bearing breaks. Also, if the bearing is too tight or too loose on the shaft, it will wear out quickly. 3. Bad Working Conditions Dust, water, or dirt getting into the bearing can ruin it. Water causes rust, and dust acts like sandpaper, scratching the bearing parts. This breaks the grease layer and makes the bearing wear out faster. 4. Wrong Bearing Choice If you pick a bearing that’s not right for your pump, it will fail. Bearings have different speeds and load limits. If the bearing can’t handle how fast the pump runs or how much weight it carries, it will overwork and break. Signs Your Centrifugal Pump Bearing Is Failing You can spot a failing bearing before it stops the pump. Look for these signs: 1. Strange Noises A good bearing makes a quiet, steady sound. If you hear buzzing, scratching, or knocking noises, the bearing is probably worn. Many people say it sounds like shaking a can of marbles. 2. Overheating Bearings should stay cool—usually below 70°C. If the bearing gets hot to the touch, or if a thermometer shows it’s over 80°C, there’s a problem. Heat means the bearing is rubbing too much. 3. Too Much Vibration A failing bearing makes the pump vibrate more than usual. You might feel the vibration with your hand, or a tool can measure it. More vibration means the bearing is not working right. How to Fix a Failing Centrifugal Pump Bearing If you see any of these signs, take action fast to avoid bigger problems: 1. Check the grease first. Add the right type of grease, or replace old grease with new grease. 2. If the bearing is making loud noises or overheating, stop the pump right away. Continuing to run it will break other parts. 3. Have a professional check the bearing. They can tell if it needs to be replaced. 4. When replacing the bearing, choose one that matches your pump’s speed and load. A good quality bearing will last longer. How to Prevent Bearing Failure Preventing bearing failure is easier than fixing it. Here are simple steps: - Check the grease regularly and add or replace it as needed. - Install bearings carefully, without hitting them. - Keep dust and water away from the pump and bearings. - Choose the right bearing for your pump. By following these steps, you can keep your centrifugal pump’s bearings working well. This saves you time, money, and the trouble of unexpected pump stops.

2026

03/05

Why Bearing Preload Matters for Machine Tool Performance

Precision, reliability, and long life in machine tool spindles don’t happen by accident. One of the most important—but often overlooked—factors is bearing preload. Preload is the controlled axial force applied to bearings during spindle assembly. It’s not just a step in installation—it’s a key design decision that directly affects how your spindle performs every day. What Does Proper Preload Do? When done right, bearing preload delivers real-world benefits: 1.Higher Rigidity = Better Accuracy Preload removes internal clearance, so the bearing resists deflection under cutting forces. This means your spindle stays stable during heavy cuts—resulting in tighter tolerances and smoother surface finishes. 2.Less Runout, Less Vibration With no play between components, rotational accuracy improves. Axial and radial runout drop, reducing chatter and vibration—critical for fine-detail machining. 3.Longer Bearing Life Even load distribution prevents stress hotspots. Plus, preload reduces skidding (micro-slippage) of rolling elements—especially at startup or high speeds—cutting down on wear and early failure. 4.Quieter, Smoother Operation A well-preloaded bearing runs smoothly without the clunk or noise caused by parts moving in and out of clearance zones. Quiet operation often signals a healthy spindle. 5.Stable Performance Under Heat During high-speed runs, metal parts expand. Proper preload compensates for thermal growth, keeping bearings securely seated and preventing loss of precision. How to Apply Preload the Right Way Getting preload right isn’t guesswork. Here’s what matters: Choose the Right Amount Too little? Your spindle lacks stiffness. Too much? Bearings overheat and fail fast. The ideal preload is usually 10–30% of the bearing’s original radial clearance, adjusted for your specific speed, load, and temperature conditions. When in doubt, consult a bearing specialist. Pick the Best Method for Your Application 1.Fixed (Position) Preload: Uses precision-ground spacers. Best for medium-speed, high-load spindles where maximum rigidity is needed. 2.Spring (Constant Pressure) Preload: Uses disc or coil springs. Ideal for high-speed spindles—it automatically adjusts for thermal expansion and wear, avoiding dangerous over-preload. Account for Heat in Real Operation In high-precision machines, temperature changes affect preload. Advanced spindles may include sensors and active systems to maintain optimal preload during operation—keeping accuracy consistent from first cut to last. Final Thought: Preload Is Part of the System Great spindle performance comes from more than just high-quality bearings—it comes from how they’re installed and tuned. For angular contact ball bearings (often used in matched pairs), preload is especially critical. At Beining Technology, we design and manufacture precision spindle bearings used in CNC machines worldwide. But we also share deep application knowledge—because the best bearing only delivers its full potential when paired with the right engineering support. Need help choosing the right preload strategy for your spindle? Contact our engineering team—we’ll help you get the accuracy, life, and reliability your machine deserves.

2026

01/26

China Beining Intelligent Technology (Zhejiang) Co., Ltd Company News

The Ultimate Guide to Bearing Preload: Types, Benefits, and Selection

Optimizing Machine Tools: A Guide to Angular Contact Bearing Arrangements

How to Install Cross Roller Bearings: A Comprehensive Guide

How to Install Angular Contact Ball Bearings: Importance of Preload for Optimal Performance

Fixing a Bearing That Won't Fit on a Shaft: Causes & Solutions

How to Fix Inner Race Creep in Spherical Roller Bearings: A Complete Guide

Water Pump Bearing Failure: Complete Guide

Bearing Seizure: Causes, Prevention and Maintenance Guide

Centrifugal Pump Bearing Failure: Causes, Signs and Fixes

Why Bearing Preload Matters for Machine Tool Performance

Precision Ball Bearings

Angular Contact Ball Bearings

Deep Groove Ball Bearings

Custom Bearings

Spindle Bearings

Motor Bearings

Planetary Gear Bearings