Ball screw repair services refurbish worn or damaged ball screws to their original condition. Ball screws are used to convert rotary motion or torque into thrust or linear motion. They have a nut that contains balls which roll along formed threads on a screw. Typically, the nut is kept stationary while the screw rotates. This causes the nut to move linearly along the screw. Repairing, refurbishing or rebuilding ball screws is significantly less expensive than replacing these mechanical components with new units. Ball screw repair services often offer quick turn-around times, especially in emergency situations.
Ball screw repair services evaluate damaged ball screws to assess the extent of the damage and then disassemble the ball screw and nut. Services may include cleaning, regrinding, and machining the threads; ball replacement and seal replacement; product reassembly and re-lubrication; and testing, inspection, and recertification. Some ball screw repair services provide reverse engineering. These companies can machine needed parts a print or a sample part. On-site or in-field ball screw repair services may also be available in some locations.
Thread repair capabilities are an important consideration when selecting ball screw repair services. Ball screws can have rolled threads, milled threads, or ground threads. Rolled screws are cold-rolled from a blank. Typically, this produces a screw with a .004 inch per foot accuracy. Milled screws are made on a milling machine using a cutter with an Acme form. Typically, this produces a screw with a .002 inch per foot accuracy. Ground screws are made on a grinding wheel with an ACME form. ACME threads are square-topped and have a very specific geometry. Typically, ball screw repair services that specialize in ACME threads can repair a screw with .0005 inch per foot lead accuracy.
Ball screw repair services account for both physical specifications and design features. Physical specifications for ball screws include unit type (English or metric), length, outer diameter (OC), lead or axial distance traveled, lead accuracy, dynamic load rating, and maximum static load capacity. Design features for ball screws include backlash, the use of a lubrication port, right-hand or left-hand threads, and twin leads. Ball screw repair services may also specialize in working with a specific nut material such as plastic or bronze.