Ball Screws/

Precision Ball Screws

Precision ball screws are devices that use a nut that rotates up and down a screw by use of ball bearings that spin in the matching helical grooves. The radial motion, or torque, is converted into linear motion called thrust.

Universal Thread Grinding Company
Fairfield, CT
203-336-1849
Providing the highest lead accuracies in the industry since 1946, Universal Thread Grinding Company specializes in manufacturing lead screw and nut assemblies for the most demanding of applications. If you require acme screws, precision ball screws, metric, linear or rolled ball screws, or a ball screw assembly - Universal Thread can provide precise and cost-effective custom or standard products.
Barnes Industries, Inc.
Madison Heights, MI
248-541-2333
Barnes Industries is the world leader in ball screw reconditioning, retrofitting and new ball screws. We were founded in 1969 and continue to be the first and only ball screw manufacturing plant devoted to reconditioning ball-bearing lead screws, and producing new ball screws with a warranty for all services. Please visit our website or give us a call today.
Service Industrial Rebuilders
Houston, TX
888-777-2658
Service Industrial Rebuilders is your one stop repair shop for ball screws, chuck repair, spindle repair, ball spline repair and manufacturing. We make new or replacement parts from your drawing or sample part. Rely on over 100 combined years of experience to recognize your problem and solve it efficiently. With 24/7, quick turnaround response, we make sure the customer is always satisfied.
Motion Systems Corporation
Eatontown, NJ
732-222-1800
Motion Systems is a manufacturer of highly efficient Epicyclic/Planetary Ball Screws for medical equipment, dental chairs, handicap equipment, material handling equipment, valve operators, ergonomic systems and many other applications. We also supply a wide variety of electromechanical linear actuators. You will find our technical support and service unparalleled.
Wedin International, Inc.
Cadillac, MI
800-759-3346
Wedin International specializes in ball screws, acme screws, lead screws, metric ball screws and ball screw assemblies. We also offer 24-hour ball screw repair. Wedin International provides several industries and applications with high-quality ball screw products and services. Wedin covers all types of motion control parts for any application. Call us today!
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Industry Information

Precision Ball Screws

Precision ball screws are often combined with linear slides and linear actuators to provide smooth motion in one direction when moving devices, parts or equipment. The threading of the screw and the threading of the nut match one another. Ball bearings roll in the grooves of the threads to provide a rolling friction and precise controllable motion. The screw is made from a strong metal such as steel; the ball bearings are usually made of chrome steel while the nut itself can be either plastic or metal. Precision ball screws have a number of benefits. When powered by a motor they are up to 90% efficient and require only low levels of energy. Precision ball screws perform critical functions in the manufacturing industry because of the level of control they allow operators to exert while transporting heavy loads. Precision and miniature ball screws are used in medical equipment, material handling equipment, conveyors and machine tools, robotic lines, precision assembly equipment, semiconductor manufacturing and fly by wire aircraft and missile control among many other product applications. Numerous industries, including aerospace, computer, electronic, automotive and medical industries, utilize precision ball screws in product applications.

Ball screws in general are manufactured by rolling, milling or grinding. Rolled screws are relatively inexpensive but are the least accurate of the three. Milled ball screws are cut by milling tools and are moderately precise. Ground ball screws are machined to their gross shape then case hardened and ground on machines with abrasive materials that spin at rapid speeds. This process allows the resulting ball screws to withstand high temperatures that would otherwise distort the shape and efficiency of the screw. Once the screw is manufactured, a nut is added. The nut is a cylindrical casing that contains threading that corresponds to the screw. The two parts do not make direct contact because of ball bearings that travel in the helical grooves, rotating inside the nut and allowing the spinning nut to smoothly glide along the screw. They circulate through the nut by use of deflectors and return. Precision ball screws generally have a 0.0005 inch per foot lead accuracy or up to ten microinches per turn. To achieve greater control, precision ball screws can be preloaded with extra weight, eliminating any axial clearance and increasing stiffness. Backlash can be minimized by using oversized ball bearings or by preloading.