Six Basic Principles Of Ball Screw Repair You Need To Understand

There are six important concepts when trying to repair a ball screw

. They are lubrication, examination of the ball screw's initial condition, extensive cleaning, rebuilding the ball screw assembly, extended testing, and refurbishing.

Ball screws are used generally in highly-specialized industries like aircraft, missiles, machinery, precision assembly equipment and robotics industries. Because of the technical nature of these industries, ball screw components need to be regularly maintained and subjected to ball screw repair to ensure optimum performance and to troubleshoot failures. Follow these basic steps to repair ball screws. It is important to understand these principles to better know how ball screw repair is undertaken.

Lubrication

One of the most common factors that contribute to ball screw failure is routine wear or poor surface finish. This occurs when the re-circulating ball screw surface is in constant contact with the hard surface of the ball screw shaft. As time goes by, the surface of the ball screw becomes rusty and worn out. Lubrication will max-out the life and operation of ball-screws. However, it is important to select the lubricant that best suits the component's conditions. It is vital to avoid over-lubricating, as it can add up to pressure on the ball nut return system and, ultimately, cause the tube to burst from too much grease.

Consider the condition of ball screw before beginning to repair

It is vital to scrutinize the initial condition of the ball screw before any changes are made. Checking the ball screw's drag torque and free running condition is included in this principle. Checking the main points that make a ball screw achieve its optimum performance is essential. This must be done in order to find out if the ball screw can be repaired.

Thorough cleansing

Before any subsequent repairs are conducted, the ball screw component has to be cleaned. First the extent of the ball screw track is polished, and then ultrasonic cleaning and high-pressure washing are used to remove built-up grease and grime.

Rebuilding the ball screw assembly

Micro-graded precision ball bearings which are above the accurate size have to be rebuilt with the use of the ball screw assembly. This will help in getting an acceptable pre-load level, which also fits the DIN requirements.

Multiple examinations

Ball screw units are tested frequently. The actual functioning and efficiency of ball screws are checked on motorized inspection rigs. To determine whether a ball screw meets the required standards and criteria extended testing is found to be helpful. An extensive test report is complied and logged when the bail screw completes the testing and passes. Drag torque graphs and other information from the report, details the criteria employed.

Giving it an overhaul

The refurbishing of bearing end journals uses methods such as hard-chrome plating and metal spraying. After this, they undergo regrinding using a precision universal grinder. If it is necessary, fixing thread forms are also refurbished after comprehensive checking and cleaning. Components like fixing key ways, wiper seals and other smaller details may also be cleaned and refurbished if needed.

Proper ball screw repair and maintenance helps make sure that the machinery and operations that use ball screws are successful and efficient.

by: danica

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