Author Archives: Tammy Rosbeck

  1. Harness the Power of Superior Spindle Repair: Take Your Manufacturing to New Heights

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    Spindle malfunctions and breakdowns can significantly disrupt manufacturing schedules, causing delays, missed deadlines, and lost revenue. These issues can occur even with superior spindles. Fortunately, reliable spindle repair services proactively address potential problems by offering preventive maintenance that can mitigate the risk of breakdowns.

    Well-maintained superior spindles ensure that machining processes run accurately, producing top-notch output and minimal material wastage. Here are the benefits of investing in reliable spindle repair services.

    Advantages of High-Quality Spindle Repair Services

    High-quality services offer the following benefits that can impact the efficiency and productivity of manufacturing operations:

    Enhanced Precision and Performance

    Precision is critical in industries requiring exact tolerances, such as aerospace, automotive, and medical. Superior spindles perform best when they are well-maintained and repaired to a high standard. This improved spindle performance allows manufacturers to consistently deliver high-quality items, helping them meet customer specifications and gain a competitive edge in the market.

    Reduced Downtime and Increased Productivity

    Downtime caused by spindle malfunctions can have far-reaching consequences, causing financial losses and disrupting production. However, manufacturers can mitigate the risks associated with these breakdowns by investing in top-notch spindle repair services. They can then count on consistent performance and precise results with superior components at the core of their operations.

    Cost Savings

    Cost savings are paramount in any manufacturing environment, and investing in high-quality spindle repair services is a strategic choice. Such services offer advantages that extend well into the long term, ultimately bolstering a business’ bottom line and financial stability.

    One of the primary ways these services contribute to cost savings is their proactive approach to repair and maintenance. Skilled technicians conduct regular spindle inspections, carefully scrutinizing for any indications of wear or potential issues. This preventive method avoids costly downtime and boosts the system’s overall health, maintaining efficiency and longevity.

    Extended Equipment Lifespan

    A longer equipment lifespan means a reduced capital expenditure for replacements. Businesses can allocate their resources to other areas such as employee training and technology upgrades rather than paying for frequent spindle replacements. This enhances the company’s financial health and enables it to make strategic investments that promote growth and innovation.

    Tailored Solutions

    Each facility operates with specific machinery, processes, and operational requirements. Service providers recognize this diversity and go beyond a one-size-fits-all approach. They have the expertise and flexibility to cater to the individual needs of manufacturers.

    Safety and Compliance

    Aside from operational efficiency, ensuring that spindles adhere to safety standards and regulations is also a legal and ethical responsibility. Companies providing reliable repair services guarantee that the spindles meet all requirements. This provides manufacturers with peace of mind and shields them from potential legal or operational complications.

    Furthermore, a thorough safety check is a key component of these services. Each spindle is rigorously tested, assessing essential safety features such as emergency stop features, safety interlocks, and protective covers. Any flaws or potential hazards are addressed and resolved to ensure the components safe operation during operations.

    Experience Cutting-Edge Solutions with RMR Spindle Repair!

    At RMR Spindle Repair, our commitment to prompt and dependable service ensures you experience minimal downtime, swiftly resuming your operations! We offer diverse solutions tailored to restore your spindles to peak performance, from minor adjustments to comprehensive rebuilds.

    Get in touch today for the best spindle repair services in the industry!

  2. From Worn-Out to World Class: Elevate Your Machinery With a Spindle Rebuild

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    Machinery forms the backbone of modern industries, driving efficiency and productivity. Within most machines, spindles act as the engine making things spin, move, and create. For instance, spindle bearing in metal-cutting equipment provides system stability, ensuring precision and surface quality.

    Unfortunately, the repetitive actions can cause even the most robust spindles to succumb to wear and tear over time, leading to decreased performance and functionality. This is where spindle rebuilds enter the spotlight, transforming worn-out machinery into world-class components.

    Understanding Spindle Rebuilds

    A spindle rebuild involves the comprehensive refurbishment of a machine’s spindle, restoring it to like-new condition. It involves a multi-step process that requires expertise, precision, and a deep understanding of machinery mechanics. Let’s break down each phase:

    1. Disassembly and Inspection

    First, technicians carefully take apart the spindle. Every part from bearings and seals to housing components is examined closely to identify signs of wear, corrosion, and other issues affecting the spindle’s performance.

    2. Component Replacement

    Worn-out or damaged components are replaced with high-quality, precision-engineered parts. In this step, choosing components that meet the original specs is crucial, directly impacting the spindle’s overall performance and longevity.

    3. Reassembly

    With new components in hand, the spindle is reassembled. This phase demands an expert understanding of tolerances and alignments to ensure optimum performance.

    4. Balancing and Calibration

    Next, technicians use specialized equipment for balancing and recalibration. These processes help eliminate vibrations that can affect performance and ensure precise rotations and speed.

    5. Rigorous Testing

    The rebuilt spindle undergoes rigorous testing before it is considered ready for deployment. This testing phase simulates real-world conditions and performance demands, allowing technicians to validate that the spindle functions flawlessly and meets or surpasses original specifications.

    The Benefits of a Spindle Rebuild

    Spindle rebuilds have some real advantages that can help your business. Here are some of them:

    1. Reduced Expenses

    Spindle rebuilds offer a smart way for business owners to save money on worn-out machinery. Instead of investing in entirely new spindles or machines, a spindle rebuild focuses on refurbishing the worn-out component. This provides restored performance and extended equipment lifespan without the hefty price tag of full replacements, maximizing value while minimizing expenses. The savings gained can then be allocated more strategically within your business.

    2. Extended Lifespan

    A rebuilt spindle isnt a short-term fix; a proper spindle rebuild can work well for a long time, so you don’t have to replace it often. This keeps your machines running and your business going.

    3. Minimized Downtime

    Machinery downtime due to spindle failure can be a major setback for any operation. Rebuilding a spindle is often quicker than sourcing and installing a brand-new machine. This means less interruption to your workflow and a faster return to optimal productivity.

    4. Improved Performance

    One of the most rewarding benefits of a spindle rebuild is the immediate boost in performance. Over time, spindles can lose their precision and efficiency, affecting the quality of your products. A rebuild restores the spindle’s performance to its original condition. This translates to smoother operations, reduced errors, and higher-quality output from your machinery.

    5. Enhanced Sustainability

    Choosing to rebuild rather than replace is an environmentally conscious choice. Rebuilding reduces waste by utilizing existing components. It also reduces the demand for new manufacturing, promoting a greener approach to equipment maintenance.

    RMR Spindle Repair for Expert and Precise Spindle Rebuilds

    When it comes to spindle rebuilds, expertise matters. Technicians skilled in spindle mechanics and engineering possess the knowledge and experience to identify underlying issues and execute a rebuild with precision. Thus, when considering a spindle rebuild, it’s vital to choose an experienced partner who understands the nuances of this intricate process.

    RMR Spindle Repair has a track record of delivering exceptional results for spindle repair! Our technicians possess the technical know-how to ensure a seamless and effective rebuild tailored to your specific machinery needs. Contact us today and witness the remarkable transformation a spindle rebuild can bring your business!

  3. Discover the Art of Spindle Repair To Boost Your Productivity

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    Spindles drive the precision, speed, and reliability needed to meet manufacturing requirements. Thus, every industrial facility heavily relies on the performance of its spindles; when a spindle falters, so does productivity. Downtime can cause scheduling disruptions, missed deadlines, and financial losses. They can also impact the manufacturing process, influencing downstream operations and jeopardizing overall efficiency.

    Spindle repair encompasses a range of specialized techniques and expertise. It involves diagnosing the causes of failure, disassembling the components, identifying and repairing damaged parts, and ensuring proper reassembly and calibration. With the right approach, it is possible to address immediate issues and rectify factors that may have contributed to the problem.

    This article will delve into the common spindle issues and their potential causes. It will also explore a few repair techniques to ensure the components remain in optimal condition.

    Top Spindle Issues and Their Causes

    Understanding the common spindle issues and their primary causes is key to rapidly addressing and resolving them. Below are some of the most prevalent problems encountered:

    Excessive Vibration

    Extreme spindle vibration refers to an abnormal level of oscillation or shaking during operation. This problem typically results in poor surface finishes on machined parts, heightened mechanical stress on different components, and decreased tool lifespan. Possible causes include unbalanced rotating parts, worn bearings, or improper tool holder installation.

    High Temperature

    When the operating temperature exceeds the recommended or normal range, excessive heat can harm the component’s performance, accuracy, and longevity. Factors that can contribute to this issue include improper cooling systems, inadequate lubrication, excessive cutting speeds, or incorrect tool selection.

    Spindle Bearing Failure

    Bearings are critical components that support and facilitate smooth rotation within the spindle assembly. A malfunction or breakdown in bearings can lead to compromised performance. This issue often happens due to inadequate lubrication, contamination, excessive loads, or improper handling during installation.

    Spindle Runout

    Runout is the extent of deviation or wobbling in the rotational axis of an operating spindle. It is a critical measurement that affects the precision and accuracy of machining processes. When a spindle exhibits runout, it can result in inaccuracies and inconsistencies in the machined workpieces. Causes of this issue include worn bearings, misalignment, damaged tool holders, or insufficient clamping force.

    Spindle Repair Techniques

    When a spindle encounters issues or malfunctions, it is essential to employ effective repair techniques to restore its functionality and avoid costly replacements. The following are some common methods utilized by professionals:


    Balancing is a repair technique that addresses excessive vibration. It begins with the identification of imbalances in the rotating components of the spindle. Then, precise adjustments are made to redistribute the weight within the assembly. This can involve adding or removing material from specific locations or using counterweights to offset the imbalances.

    Bearing Replacement

    Skilled technicians can diagnose bearing problems through careful inspection and analysis. They assess the condition of the bearings, checking for signs of wear, abnormal noise, excessive play, or any other indications of component failure. Bearing replacement involves removing faulty or worn bearings and installing new ones properly sized for the assembly.

    Alignment Adjustment

    Misalignment between the spindle and other components can result in runouts and inaccuracies in machining operations. Spindle repair professionals can adjust alignment using precision measurement tools to align the spindle with the machine axis. This technique restores the spindle’s concentricity and enhances accuracy.

    Spindle Rebuild

    A rebuild is a comprehensive repair technique employed when a spindle has experienced severe damage that cannot be addressed through simpler repair methods. This technique involves disassembling the spindle, replacing damaged components, and reassembling it to restore its original functionality. It also includes inspecting the parts, such as bearings, shafts, gears, and housings.

    RMR Spindle Repair: Your Trusted Partner for Superior Spindle Solutions

    With over 65 years of experience, RMR Spindle Repair leverages industry-leading knowledge and cutting-edge tools to ensure accurate diagnoses and precise repairs! We are also committed to providing prompt and reliable services to get you back up and running in no time. From minor repairs to complete rebuilds, we offer various solutions to restore your spindles to their optimal condition.

    Contact us now for more information!

  4. 10 Common Problems With CNC Machine Tools

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    Click to Expand10 Common Problems with CNC Machine Tools

    The CNC machining process produces complex machined parts with ease and precision. The entire operation relies on successfully integrating machine tools and equipment; therefore, you must maintain them in excellent condition. However, there is always the possibility that the machine tools will malfunction, particularly in continuous production.

    The most commonly used tools and equipment for CNC machining are drills, lathes, and milling machines. There are also other modern technologies like laser, plasma, and waterjet cutters — all of which are susceptible to issues and malfunctions.

    Here are some of the most common problems and issues with CNC machining tools and the basic solution for each:

    1.  Incorrect Tools or Configurations

    Using incorrect machining tools often produces substandard material manufacturing and finishes, including rough edges and burn marks. Consequently, this inaccuracy may deteriorate the equipment over time. Moreover, using a tool with the wrong dimensions in terms of size, quality, or compatibility with the material might result in equipment failure.

    Understanding the applications and differences between different tools is the first step in resolving this issue. This will help you choose the right machines and equipment for your CNC machining task.

    2.  Programming Errors

    Specialized computers operate every CNC machine, and inaccurate programming may reduce the machining process’ quality and efficiency. Typically, this issue is caused by the operator’s misunderstanding of the implemented codes. A solution for this problem is properly training operators in all aspects of the tools.

    3.  Poor Equipment Maintenance

    Failure to maintain a regular maintenance schedule for the machinery may result in inaccuracies and problems that build up over time. Therefore, operators must adhere to strict maintenance routines for in-service tools and equipment to avoid this issue. Additionally, they should regularly inspect airflow or coolant levels to ensure that operations continue to run smoothly.

    4.  Power Supply Issues

    Power supply issues could impair the performance of CNC machine tools. For instance, low power or voltage readings and blown fuses may lead to the complete failure of a machine. To prevent this, check the power supply’s input and ensure they have the correct voltage and capacity.

    5.  Overheating

    Continuously operating CNC machines frequently results in overheating, with temperatures exceeding 150 ℉. To prevent this, ensure that all lines are periodically cleaned and that the machine is free of dirt, soil, and debris.

    6.  Automatic Tool Changer Issues

    A CNC machine tool utilizes an automated tool changer (ATC) to increase production and tool-carrying capacity. Unfortunately, ATC errors are common, leading to complications throughout the machining process.

    A crucial step to resolving this issue is to inspect the base, tool holder, and support arm. ATC troubleshooting is also frequently coupled with a generic tool changer alarm. Lastly, determine the machine’s diagnostics and switches so that you can replace or repair them appropriately.

    7.  Machine Chatter or Vibration Issues

    It is normal for machines to produce vibrations when in use, but if they begin to make unwanted sounds that grow louder over time, there is a complication. You can solve this by knowing whether or not your tool chatters. In that case, consider adjusting the RPM such that its frequencies do not resonate with the material frequency.

    8.  Clamping or Unclamping of Chucks and Fixtures

    Chucks and fixtures become loose with time, causing the spindle to lose its grip on the fittings. This can cause the machine tool to vibrate during the machining operation. This clamping and unclamping may result in poor construction of the machined product and even operator injuries. To address this, verify that all parts are properly positioned to ensure adequate clamping.

    9.  Insufficient Worker Skills and Training

    Machining errors may be related to the personnel’s lack of training and expertise. Their skill sets may be outdated, posing a challenge for new and creative CNC machines and processes. To resolve this problem, all workers must undergo updated and comprehensive training to develop management and technical skills.

    10.  Burnt Traces on the Relay Board

    Relay boards are computer circuit boards containing an assortment of switches; they are equipped with input and output terminals to regulate the voltage supply. If you detect that one of the traces on a relay board has been burned, you must de-solder the burnt tracing wire and replace it with a new one.

    Choose RMR Spindle Repair for Superior CNC Spindle Repair Services!

    Spindles are essential components of machine tools and considerably impact the precision and quality of machined parts. This necessitates adequate spindle maintenance for optimal tool performance.

    RMR Spindle Repair has over 65 years of experience in CNC spindle repair! We have the knowledge, skills, and expertise to assist you in optimizing your spindles’ performance and minimizing downtime.

    Contact us now for any spindle repair service you need!

  5. What Causes Spindle Failure?

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    Click to ExpandWhat Causes Spindle Failure

    Spindles are standard components of any turning operation. Unfortunately, even the highest-quality rotating machines can experience spindle failure, particularly when high-speed parts can rotate at capacities of up to 65,000 RPM.

    There are different causes of spindle failure — each necessitating a unique approach to spindle repair — but the most common are collisions with workpiece materials or bearing malfunctions. This article will examine the reasons for a spindle breakdown and how to fix or avoid them.

    Possible Causes of Spindle Failure and How To Avoid Them

    Some factors not associated with a spindle’s expected lifespan may cause it to fail prematurely. However, you must know the indications that your component is failing before requesting a repair or replacement. For example, wear and tear are common when the tool holder slips within the spindle. Other signs include external noises, loose connections, or spindles that become significantly hotter during operations.

    The following are some of the most common reasons why a spindle fails before a total part collapse:

    Poor Lubrication Application

    Poor lubrication is one of the most frequent causes of spindle failure. Bearings are prone to overheating when subjected to extreme operation and can completely collapse if not adequately lubricated.

    Moreover, improper application of lubricants — either too much or too little — can cause component malfunction. For example, bearings can seize if there is insufficient lubrication, while they might overheat and fail if there is too much. The subsequent bearing damage can include tapered roller deterioration, raceway breakdown, and cage fragmentation.

    Here are three things to remember about lubrication to ensure longer bearing life:

    • Always use the proper lubricant type. Since there are different types of bearing grease and oil, it is critical to find which has the right consistency and viscosity for your components.
    • Always apply the right amount of lubricant. Inadequate lubrication can damage your bearings, but too many fluids can also pose complications. Make sure to follow your machine’s lubricant specifications to extend the life of your bearings.
    • Always use lubricant at the proper time. Even if you use the correct type and amount, applying it too frequently or rarely can cause bearing failure. Following a lubrication routine will ensure peak performance.

    Improper Installation or Removal

    This cause of failure can occur if the spindle is not properly installed or removed. Improper installation or removal can also cause bearings, shafts, and other components to be damaged. Moreover, any shock load to the spindle can cause brinelling or the permanent indentation of a bearing surface.

    Using the right tools in a clean work environment is critical to ensure proper installation. It is also important to take time installing the parts because estimating or eyeballing their locations may cause significant damage to the components. Lastly, hire a professional if necessary; someone you trust with expert knowledge and experience can assist in properly installing or removing your spindles.


    Contamination encompasses foreign substances and water, infiltration through seals, improperly stored or poor-quality lubricants, and inadequate assembly.

    To combat this problem, you should use clean and dry compressed air for air-oil lubrication systems. An annual air system inspection is also recommended because preventing debris accumulation on seals extends their useful life and reduces bearing contamination. Moreover, install seals according to manufacturer instructions.

    Mishandling and Storage Mistakes

    Mishandling may include dropping the spindle or exposing it to excessive shock loads. In addition, improper storage can cause failure because temperature fluctuations and high relative humidity can cause the spindle to rust or corrode.

    To prevent condensation from accumulating, you should maintain a low-humidity storage area for spindles. It is also best to keep spindles dry in areas where the temperature does not fluctuate between 65 ℉ and 120 ℉.

    Choose RMR Spindle Repair for Guaranteed Services

    RMR Spindle Repair’s expert team performs professional spindle testing, guaranteeing the shortest turnaround times possible! We also offer chrome plating and grinding services for spindle housings, shafts, and tapers. Moreover, we can cater to your motor cleaning, repair, baking, and other testing needs.

    Get in touch with us today if you require spindle repair services!

  6. Maximizing The Life Of Different Types Of Spindles

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    Click to ExpandMaximizing The Life Of Different Types Of Spindles

    The spindle is considered the machine’s heart and is usually designed with its application and precise specifications in mind. However, whether used for grinding, turning, or milling, different types of spindles experience various failures or breakdowns. These necessitate varying repair procedures, frequently resulting in unnecessary spindle repair costs.

    Nonetheless, it is possible to avoid spindle failure, extend your spindle’s life, and optimize efficiency and output by following simple guidelines. While all spindles have a finite lifespan, proper maintenance prolongs their usability, making them more cost-effective in the long run.

    This article will cover essential tips for maximizing the life of different spindle types — grinding, milling, and lathe.

    What Are the Different Spindle Types?

    Different types of spindles are used for various applications. Hence, you must first understand the type of spindle used for each application to fully understand how to extend their life.

    Grinding Spindles

    Grinding spindles are used for applications ranging from rough shop bench grinding to precise CNC machining. They are also used to work with materials such as metal, plastic, stone, wood, glass, and polymer blends. You can use several kinds of spindles as grinding spindles, including the following:

    • Motorized spindles that equip traditional grinding wheels for grinding tasks
    • Traditional grinders for CBN grinding wheels
    • CNC-controlled motorized spindles

    Milling Spindles

    Milling spindles are often used to cut a workpiece. The milling tool is usually accommodated by other devices, such as hollow shaft tapers (HSK) or quick-release tapers (SK). The most common types of spindles for milling include belt-driven spindles, direct-drive spindles, and motorized spindles.

    Lathe Spindles

    The lathe spindle connects the headstock to the axle of the lathe engine. Like the other types, these spindles are used for machine-cutting parts and components.

    Lathe spindles are available in several kinds. Belt-driven spindles are standard on older lathes; they take longer to spin up and slow down. On modern lathes, however, direct-drive spindles are standard. They can achieve top spindle speeds up to twice as fast as belt-drive models, making them ideal for high-volume manufacturing.

    How Do You Extend Your Spindle’s Life?

    Whether you have a grinding spindle, milling spindle, or lathe spindle, improving the spindle’s life requires a careful combination of proper care and a thorough understanding of the component. In addition to professional-level preventative maintenance and inspection, the following basic guidelines can help reduce downtime and save money on CNC spindle repair or replacement:

    1. Always Check for Spindle Taper Wear or “Bell Mouth”

    It is critical to perform regular checks on the spindle taper, which is the part that wears the quickest. It is exposed to the elements and the most easily damaged by metal shavings and debris.

    You can check for defects in the taper by measuring total indicated runout (TIR) in the taper and also measuring TIR over a precision test bar. The TIR or the Total Indicated Runout means the distance measured between the biggest plus measurement and the smallest minus measurement for the total amount indicated. If the measurement differs significantly, you may have a problem at hand.

    You can also blue up a known good toolholder and use it to check in the spindle. Setting aside a toolholder for this testing is recommended to ensure that it is a valuable and pertinent reference. If you get less than 75% contact with the taper, there is a problem.

    2. Examine the Toolholder for Fretting and Taper Wear

    Excessive and potentially serious wear occurs when a toolholder slips within the spindle. A good spindle taper does not always imply a good toolholder taper. If your spindle taper is more rigid than your toolholder tapers, they should bear the brunt of the wear. Begin by carefully inspecting your toolholders for minor scratches and discoloration, especially near the big end. Moreover, keep an eye out for fretting wear, which occurs when two steel parts rub against each other.

    3. Regularly Check Pull Studs for Signs of Wear or Damage

    Pull studs, also known as retention knobs, are consumable parts that are screwed into the top of a toolholder. It is held in place by either a finger or a ball-bearing gripper. The drawbar then grips the pull stud to tighten the toolholder into the spindle taper.

    A pull stud has an average lifespan of two to three years. However, this can considerably shorten, depending on the damage it endures. Thus, it is vital to regularly check your pull studs for wear, cracks, or other damage and replace those in poor condition. When replacing a pull stud, clean and degrease the thread, then apply thread locking compound (low or medium force, not high force) and torque to specifications.

    4. Keep Everything Clean

    Cleanliness is crucial for spindle and toolholder durability. Contaminants can cause poor TIR and influence the premature wear of several parts, so you must maintain the cleanliness of all toolholders, collets, collet nuts, and cutter shanks.

    5. Check the Drawbar Force

    Low drawbar force puts the spindle at risk. You could damage a toolholder by spinning it in the taper, or if the force is strong enough, the drawbar could lose grip and send the toolholder flying. On average, you should check the drawbar force every six months to ensure it will last one million cycles.

    6. Ensure Adequate Lubrication and Vibration

    Be on the lookout for excessive vibration. Any unusual vibration is a warning sign that something is wrong and should be investigated. If you have an air/oil lubricator, ensure the lubricants are clean and the air-intake filters are in good working order.

    The Best CNC Spindle Repair by RMR

    RMR Spindle Repair, Inc. is a global repairer of machine tools. We ensure the use of the highest quality testing equipment, lubrication systems, motors, acoustic control systems, balance and process control systems, and other spindle machine parts when sourcing our spindle repair parts and accessories.

    We are also proud of our facility and equipment, which give us unrivaled capabilities for completing the best spindle repair and other spindle-related work. By partnering with us, you can avoid downtime and save money. Contact us today for a consultation, and we will discuss the best possible repair solutions for your needs.

  7. Where To Find Spindle Parts

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    Click to ExpandWhere To Find Spindle Parts

    Spindle unit performance is critical to the quality of the machined parts and machine maintainability. It includes belt-driven, motor-integrated, and tool-driven spindles and is used in various machines ranging from high-speed milling to high-capacity turning processes. In essence, the spindle parts’ performance and the overall spindle unit determine the machine operation quality and equipment efficiency.

    On the other hand, spindle failure is a common problem in any manufacturing or industrial setting, resulting in unprecedented downtime. There are several causes of spindle failure, and each requires a different approach to repair. Collisions with workpieces or bearing failures are the most common causes of spindle failure.

    In this article, we will guide you through the different spindle parts and their common fixes and repairs in the event of a failure or breakdown.


    A spindle is a rotating axis of a machine with a shaft at its center. However, the term “spindle” is also used to refer to the entire rotating unit — including the shaft, bearings, and anything else attached to it. The spindle parts, as well as their standard fixes and repairs, are as follows:


    A housing must hold the spindle shaft and motor in place. It could be built into a machine tool or a cartridge housing and mounted with a block, foot, or flange. Many high-speed spindle models use cartridge-type housings because they are the easiest to support and because high-speed tolerances are easier to achieve when the housing is manufactured as a cylinder.

    This spindle part’s core purpose is to enclose the bearings. Therefore, it must precisely sustain and pinpoint the bearings while providing utilities to the spindle system. It is also necessary for the housing to be solid and stiff because it transfers all forces from the spindle to the machine tool.

    The most common problem with spindle housings is a lack of bearing-housing clearance at the rear of the unit, which can lead to excessive bearing preload and seizure. Housing bores or other defects on diameters can be corrected with chrome plating and grinding, which are offered by RMR Spindle Repair.


    Any spindle design would be incomplete without a bearing system. The spindle must transfer torque and power to the cutting tool and have a reasonable loading and life. The bearing type must meet these specifications, or the spindle will not operate effectively.

    There are various bearing types used with machine tool spindles. Some of them include the following:

    • Angular contact bearings
    • Ceramic hybrid bearings
    • Air bearings
    • Roller bearings
    • Tapered roller bearings
    • Hydrostatic bearings
    • Magnetic bearings

    Bearing failures are caused mainly by excessive preload (negative radial clearance), which may result in a high-bearing running temperature and seizure. Another failure is the angular contact bearings tolerance mismatch in which angular contact bearings with standard outer diameter (OD) tolerance may fail.

    These can be repaired by replacing the bearings. It would also be beneficial if the spindles were reassembled with precision bearings identical to the original bearings installed.


    Spindle designers use seals to prevent external contamination from entering the spindle unit. These seals are necessary because high-precision bearings are highly susceptible to contamination — from chips, dirt, dust, coolant, and other foreign material on the surfaces – usually causing premature failures.

    When a seal fails, the most common solution is to replace it with another. Furthermore, protecting spindles in high-contamination areas necessitates a thorough examination of the spindle’s existing seals, with the ultimate goal of preventing contaminants from entering and destroying the bearings.


    A standard belt-driven spindle setup consists of the spindle shaft, which is supported by the spindle housing and is held in place by a bearing system. In addition, the tooling system — tool taper, drawbar mechanism, and tool release system — is integrated into the spindle shaft.

    The most common failure is shaft misalignment, usually caused by premature bearing, seal or coupling failure, excessive vibration, high housing temperature near the bearings, and excess oil leakage in the bearing seals. You can avoid these by regularly checking the shaft straightness or alignment relative to the tool side and avoiding excessive belt tension on belt-driven spindles.

    If a total shaft failure occurs, RMR Spindle Repair is more than capable of cleaning, repairing, and — if necessary — chrome-plating your spindle shaft.


    The spindle motor is mounted independently of the shaft. As a result, it is frequently possible to use a huge motor. A motor, especially one with a large diameter, can provide extremely high torque and power for spindle use. However, this is more difficult because available space is always limited in an integral motor spindle design. Typically, the rotor is attached to the spindle shaft via adhesive or thermal clamping, whereas the stator is the winding around which the rotor revolves.

    Too high winding temperature is a common stator fault caused by too high voltage, a broken rotor cage bar, or water leakage from the water jacket. In the occurrence of a stator fault, RMR Spindle Repair provides stator cleaning, baking, testing, and rewinding.


    As a machining operation, taper turning is the gradual reduction in diameter from one part of a cylindrical workpiece to another. A workpiece has an external taper if tapered on the outside; an internal taper if tapered on the inside.

    A damaged taper, frequently resulting from simple wear and tear, can lead to complex mechanical problems. Straight marks on the taper indicating fretting are common signs of deterioration. Natural deterioration can lead to many more significant machining issues that you must address as soon as possible because the taper is subjected to high-speed conditions and frequent tool changes. Chrome plating is the most common solution for any taper fault.


    Manufacturing and production downtime caused by spindle failure is frustrating, costly, and detrimental to any project. However, you can prevent this by partnering with a reputable and reliable repair and service provider.

    RMR Spindle Repair has over 45 years of experience in spindle repair, including work for the United States Navy and one of the world’s leading machine tool and automation component suppliers. As a result, we have the knowledge, expertise, and background necessary to help you optimize the performance of your spindles and minimize downtime for better project results.

    Moreover, our facility and equipment provide us with unmatched capabilities to perform the best spindle repair and other spindle-related work and conduct professional spindle testing to ensure consistent, high-quality service for our clients.

    Contact us today for any spindle repair service you need!

  8. A Comprehensive Guide To The Parts Of A Spindle

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    Click to ExpandA Comprehensive Guide To The Parts Of A Spindle

    The control is the brain, the motor is the muscle, but the spindle is the beating heart of any CNC machine tool. Machining centers, just like the human body, need a reliable heart to avoid mishaps and tragedies. For machine shops, these tragedies can manifest in unforeseen repair costs and downtime that can drag on for days and weeks.

    When a spindle stops working, cutters break, and parts are injured. As a result, customer deliveries and cash flow are heavily affected. Additionally, operators may be injured while working with a dysfunctional spindle. Fortunately, a machine spindle preventive maintenance plan helps avoid all this unpleasantness. Curious to find out how to prolong your spindle life? Read on.

    Parts & Characteristics Of Spindles On A Machining Center

    Spindles are instrument-grade, high-precision machine tools. They are rotating components that hold and drive cutting tools or workpieces on lathes, milling machines, and other machine tools. They utilize belts, gear, and motorized, hydraulic or pneumatic drives and are available in various configurations depending on the application.

    Most machine tool spindles that go in the heads of cutting tools feature a Morse taper or other standardized machine tool taper or portion of a tool holder that fits inside the opening of the spindle.

    Spindle heads are used for speed machining operations and repetitive precision work such as close-tolerance center holes. There are various bearing types used with machine tool spindles. Some of them include:

    • Air bearings
    • Angular contact bearings
    • Ceramic hybrid bearings
    • Hydrostatic bearings
    • Magnetic bearings
    • Roller bearings
    • Tapered roller bearings
    • Specifications

    Selecting machine tool spindles requires analyzing specifications, tool mounting, and spindle features directly affecting the overall function. Performance specifications include:

    • Operating speed
    • Spindle power
    • Maximum torque
    • Input voltage

    Tips For Proper Spindle Care & Maintenance

    Periodic predictive maintenance and inspection performed by professionals will help you reduce scrap, decrease downtime and save money on spindle repairs. Here are some tips to help you find and correct spindle problems before catastrophic failure and machine tool crashes.

    Monitor lubrication.

    It is crucial to a spindle’s longevity and overall performance to keep your lubricating fluids clean and at safe operating levels. Service the air-intake filters regularly if you have an air/oil spindle. Additionally, maintain spindle-bearing lubrication. It’s essential to keep the proper oil levels in these baths.

    Gauge and test.

    Assess your spindle’s runout every six months or after any crash via ground and calibrated spindle test bar. You can monitor your spindle’s spring force with a drawbar pull test.

    Monitor spindle vibration levels.

    If your machine has a built-in vibration sensing technology, pay attention to any alarms. Damaged spindle bearings usually cause more vibration, so replace them when necessary.

    Check the cooling system.

    If your spindle is high-speed and has a cooling system, ensure the chiller unit runs appropriately. A rise in the chiller system output temperature usually indicates a spindle problem. If this occurs, have a certified technician thoroughly check the system.

    Keep the machine covers on.

    Always re-install any machine covers that have been removed due to routine maintenance or any other reason. These covers protect the spindle area, keeping contaminants from infiltrating the spindle, its motor, and other components.

    Get professional help for your spindle repair.

    When your spindle requires a repair or rebuild, it’s best to have the machine tool professionals perform the services to ensure the use of factory-certified parts and that all repairs reflect the equipment’s original specifications.

    Your experts at RMR aim to reduce your downtime, get your spindle back in production and return your machine tool running like it is brand new!

    At RMR, we offer the following spindle repair services:

    • Adjust to tight tolerances (.00005)
    • Perform spindle vibration analysis
    • Test motorized spindles up to 95 Amps 460 Volts, 3200 Hertz, 50 H.P., and 2 tons in weight
    • Balance belt-driven spindles with a dedicated pulley, thereby increasing spindle life by as much as 50%
    • Document evaluation and final readings for superior quality control
    • Repair, rebuild, and store spindles in climate controlled environment
    • Extend the warranty of your spindles past the standard 6 months
    • Emergency repair 24/7, 365 days a year
    • Newly expanded to 8,750 square feet

    Nationwide Spindle Service & Repair by RMR

    RMR Spindle Repair, Inc. is one of the world’s leading machine tools and automation components suppliers. We source our spindle repair parts and accessories only from the top manufacturers in the industry, using the highest quality selection of spindles, motors, lubrication systems, acoustic control systems, balance and process control systems, and other spindle machine parts.

    Aside from our spindle repair and other spindle-related services, we have a dedicated clean space to meet your repair needs. We also offer professional spindle testing capabilities. We can provide the fastest turnaround times you will need, and our technicians and experts are among the highest skilled in their fields. Contact us today to discuss your spindle repair needs.