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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.    

  スピンドルベアリングは、CNCフライス盤、グラインダー、高速モーターなどの精密機械において重要なコンポーネントです。故障すると、高額なダウンタイム、精度の低下、高額な修理につながります。 これらの問題を回避するために、スピンドルベアリングの故障の主な5つの原因と、それらを防ぐ方法をご紹介します。 潤滑不良 潤滑剤の不足、不適切、または劣化は、摩擦の増加、過熱、および急速な摩耗につながります。間違ったオイルやグリースの使用、潤滑不足、または予定された再グリース化の失敗は、すべて早期故障の原因となります。 予防策：メーカー推奨の潤滑間隔に従い、適切な種類と量の潤滑剤を使用してください。 不適切な取り付け ベアリングを無理に押し込む、ミスアライメント、不適切なフィッティング（きつすぎるまたは緩すぎる）、または間違ったツールの使用は、最初からレースと転動体を損傷させる可能性があります。 予防策：常に適切な工具と技術で取り付けてください。ベアリングを直接ハンマーで叩かないでください。指定された熱的または機械的方法を使用してください。 汚染 ベアリングに侵入するほこり、金属片、汚れ、または水分は、研磨剤のように作用し、内部表面を徐々に削り、摩耗を加速させます。 予防策：効果的なシール（例：2RS、ZR）を使用し、クリーンな組み立て環境を維持し、ベアリングを慎重に取り扱ってください。 過負荷 設計限界を超えて機械を運転すると、ベアリングに過度のストレスがかかり、ブリネル、亀裂、疲労破壊につながります。 予防策：定格荷重と速度の仕様内で運転してください。ベアリング容量をアプリケーションの要求に合わせます。 腐食と水分 水の浸入または腐食性化学物質への暴露は、特にシールが損傷している場合や湿度の高い環境では、錆の原因となります。 予防策：耐腐食性材料（ステンレス鋼など）または密閉型ベアリングを使用してください。摩耗したシールを速やかに検査し、交換してください。 ベアリングの長寿命化のためのプロのヒント: 定期的なメンテナンススケジュールを守る 温度と振動を監視する 作業エリアを清潔で乾燥した状態に保つ 適切な取り扱いについて技術者を訓練する 精密性と耐久性のために設計された高品質のベアリングを選択する ヒント：Beining Technologyなどのプレミアムベアリングにアップグレードすると、耐用年数を大幅に延長し、ダウンタイムを削減し、機械の性能を向上させることができます。 最終的な考え: 予防は修理に勝ります。適切な選択、取り付け、およびメンテナンスにより、スピンドルベアリングは長年の信頼性の高い高精度な動作を提供できます。 賢く選びましょう。定期的にメンテナンスしましょう。より良いパフォーマンスを発揮しましょう。 Beining Intelligent Technology (Zhejiang) Co., Ltd. モーター、ロボット工学、自動化用の精密ベアリング WhatsApp: +86 180 5823 8053 ウェブサイト: www.precisionball-bearing.com