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A Practical Guide for Precision Spindle Assembly   Angular contact ball bearings are essential for high-speed, high-precision machine tool spindles. When used in matched pairs — such as back-to-back, face-to-face, or tandem configurations — they provide excellent rigidity and load-carrying capacity. However, their performance depends on one critical factor: correct preload.   And the key to setting preload? The spacer between the bearings.   This guide walks you through the step-by-step process of adjusting spacers to ensure optimal bearing performance, longer spindle life, and superior machining accuracy.   Why Spacer Adjustment Matters   The spacer, also known as a distance ring or gap ring, controls how tightly the two bearings are pressed together. This directly affects internal preload:   Correct Preload: Removes internal clearance, increases stiffness, reduces vibration, and ensures smooth, quiet rotation. Too Much Preload: Causes high friction, rapid temperature rise, and can lead to early bearing failure. Too Little Preload: Results in axial play, noise, vibration, and poor machining quality. Pro Tip: Never assume the spacer is ready to use out of the box. Most require fine grinding to match your specific application and achieve the ideal preload.   Step-by-Step: How to Adjust Spacers   Step 1: Choose Your Bearing Arrangement   The configuration determines which spacer controls the preload:   Back-to-Back (DB): Best for handling moment loads. Preload is set by the outer ring spacer. Face-to-Face (DF): Better at accommodating minor misalignment. Preload is controlled by the inner ring spacer. Tandem (DT): Used when high axial load capacity in one direction is required. Both bearings share a common spacer. Choose the right setup based on your machine’s load and precision needs.   Step 2: Measure All Components   Use a precision micrometer to measure:   The width of each bearing’s inner and outer rings The initial thickness of the spacers Even tiny differences — as small as 0.001 to 0.005 mm — can significantly impact preload. Accuracy is crucial.   Step 3: Adjust the Spacer Width   This is the most important step:   To increase preload, make the spacer slightly thinner. To decrease preload, make the spacer slightly thicker (or replace it with a larger one). Note: Spacer grinding requires precision equipment and experience. If you don’t have the tools, consider working with a bearing service center or using factory-preloaded matched sets.   Step 4: Clean Everything Thoroughly   Contamination is a major cause of incorrect preload and premature failure. Before assembly, clean:   The spindle shaft and housing The bearings The spacers Use a lint-free cloth and a pure solvent like isopropyl alcohol. Handle all parts with gloves to avoid fingerprints and oil transfer.   Step 5: Assemble Carefully   Follow these best practices:   Place the spacer between the bearings, ensuring full and flat contact. Use a proper press tool — never use a hammer, as impact can damage raceways. Apply even, steady pressure during installation. Misalignment or uneven force can ruin the adjustment and damage components.   Step 6: Test the Setup   After assembly, run a short test:   Operate the spindle at low speed (20–30% of maximum RPM) for 10–15 minutes. Monitor bearing temperature — a quick temperature rise means preload is too high. Check for unusual noise or vibration — smooth operation is ideal. Use a dial indicator to measure axial play — any movement indicates insufficient preload. If any issues arise, disassemble and re-adjust the spacer until the results are within specification.   Pro Tip: Save Time with Pre-Adjusted Bearing Sets   For consistent, reliable results, consider using factory-matched, preloaded bearing pairs. These sets come with precisely ground spacers and are tested for specific preload levels — eliminating trial and error and reducing setup time.   Conclusion: Precision Makes the Difference   Adjusting spacers is not just a mechanical step — it’s a precision process that directly affects spindle performance, accuracy, and bearing lifespan.   By measuring carefully, adjusting accurately, cleaning thoroughly, and testing before full operation, you can achieve maximum rigidity, stability, and reliability in your high-performance applications.   About Beining Technology   Beining Technology specializes in high-precision angular contact ball bearings for CNC spindles, grinding machines, electric motors, and industrial automation systems.   We offer: Matched bearing pairs in DB, DF, and DT configurations Custom preload options (light, medium, heavy) Technical support for installation, maintenance, and optimization Contact us today for product specifications, free samples, or expert advice on selecting the right bearing solution for your machine.

Precision, speed, and reliability—these are the demands of modern CNC machining. At the heart of every high-performance spindle are precision bearings, and their performance depends heavily on one critical factor: the right lubricating grease.   Using the wrong grease can lead to overheating, premature wear, vibration, and even spindle failure. At Beining Technology, we specialize in precision spindle bearings—and we know that proper lubrication is just as important as the bearing itself. Here’s what you need to know to choose the best grease for your CNC spindle bearings.   Best Types of Grease for Spindle Bearings   Not all greases are suitable for high-speed, high-temperature spindle applications. The top-performing options include:   1.Synthetic Greases (PAO or Ester-based)   Why it works: Synthetic base oils offer superior thermal stability and oxidation resistance.   Benefits: Maintains consistent viscosity at high speeds, reduces friction, and extends re-lubrication intervals.   Ideal for: High-speed spindles (30,000+ RPM) and continuous operation. 2.Anti-Wear (AW) & Extreme Pressure (EP) Greases   Why it works: Contains additives like Molybdenum Disulfide (MoS2) or graphite that form a protective layer under heavy loads.   Benefits: Prevents metal-to-metal contact during shock loads, rapid acceleration, or start-stop cycles.   Ideal for: Heavy cutting, milling, and applications with frequent load changes. 3.Lithium Complex Greases   Why it works: Lithium complex thickeners provide excellent high-temperature performance, water resistance, and mechanical stability.   Benefits: Multi-purpose, long-lasting, and resistant to softening or bleeding.   Ideal for: General-purpose spindles operating under variable loads and temperatures. Key Factors When Choosing Spindle Grease   Temperature Performance   Spindle bearings can reach 80–120°C or higher. Choose grease with a dropping point above 180°C and a continuous operating range that matches your spindle’s conditions.   Oxidation Resistance   Prevents grease from hardening, forming sludge, or losing lubricity during long runs. Synthetic greases perform best in this area.   Rust and Corrosion Protection   Moisture and contaminants can damage precision raceways. Look for greases with anti-rust additives to protect bearing surfaces.   Consistency (NLGI Grade)   Most spindle bearings use NLGI Grade 2 or 3. Grease that is too soft may leak; too stiff may not distribute evenly.   Brand and Quality   Low-quality grease may contain impurities that accelerate wear. Always choose reliable brands or OEM-recommended products to protect your investment.   Why Grease Choice Matters for Your Spindle   Extends bearing life by reducing wear and heat buildup Improves machining accuracy by minimizing vibration and thermal growth Reduces downtime with longer service intervals Protects your CNC equipment investment The Beining Technology Advantage   At Beining, we don’t just manufacture precision spindle bearings—we understand the full ecosystem of performance. Our engineering team can help you:   Select the optimal grease for your spindle type and application Recommend re-lubrication intervals Provide technical support for maintenance best practices Protect your productivity. Maximize spindle life.   Contact Beining Technology today for expert guidance tailored to your machinery and operating conditions.    

  Spindellagers zijn cruciale onderdelen in precisie-machines zoals CNC-molen, slijpmachines en hogesnelheidsmotoren.en dure reparaties. Om u te helpen deze problemen te vermijden, zijn hier de 5 belangrijkste oorzaken van spindellagerafbreken en hoe u deze kunt voorkomen. Slechte smeermethodeEen onvoldoende, onjuiste of slecht gesmeerde smeermiddel leidt tot meer wrijving, oververhitting en snelle slijtage.of het niet op tijd opnieuw smeren kan allemaal leiden tot vroegtijdig falen. Voorkoming: Volg de door de fabrikant aanbevolen smeerintervallen en gebruik het juiste soort en de juiste hoeveelheid smeermiddel. Onjuiste installatieDoor lagers op hun plaats te dwingen, deze verkeerd uit te richten, onjuist te bevestigen (te strak of te los), of verkeerde gereedschappen te gebruiken, kunnen races en rollende elementen vanaf de eerste dag beschadigd raken. Voorkoming: Installeer altijd met de juiste gereedschappen en technieken. VerontreinigingStof, metaalsplinter, vuil of vocht dat het lager binnendringt, werkt als schuurmiddel en slijt langzaam de binnenste oppervlakken af en versnelt de slijtage. Voorkoming: Gebruik effectieve afdichtingen (bijv. 2RS, ZR), houd de montageomgeving schoon en behandel lagers zorgvuldig. OverbelastingMachines die verder gaan dan de ontwerplimieten, leggen overmatige belasting op de lagers, wat leidt tot scheuren en vermoeidheid. Voorkoming: werken binnen de nominale belasting- en snelheidsspecificaties. Corrosie en vochtDoor het binnendringen van water of blootstelling aan corrosieve chemicaliën ontstaat roest, vooral als de afdichtingen beschadigd zijn of in vochtige omgevingen. Voorziening: Gebruik corrosiebestendige materialen (zoals roestvrij staal) of gesloten lagers. Pro tips voor een langere levensduur: Houd u aan regelmatige onderhoudsprogramma's Temperatuur- en trillingscontrole Houd werkplekken schoon en droog Opleiding van technici op het juiste gebruik Kies lagers van hoge kwaliteit die zijn ontworpen voor precisie en duurzaamheid Tip: Als je een upgrade doet naar premium lagers, zoals die van Beining Technology, kun je de levensduur aanzienlijk verlengen, de stilstandstijden verminderen en de prestaties van de machine verbeteren. Laatste gedachte:Met de juiste selectie, installatie en onderhoud kunnen spindellagers jarenlang betrouwbaar en nauwkeurig werken. Kies verstandig, onderhoud het regelmatig, werk beter. Beining Intelligent Technology (Zhejiang) Co., Ltd.Precisielagers voor motoren, robotica en automatiseringWhatsApp: +86 180 5823 8053Website:Voor de toepassing van deze richtlijn geldt dat de in artikel 5 bedoelde voorwaarden worden nageleefd.