Portfolios

High Load Capacity Ball Screw

Barnes Industries can design and manufacture very high load capacity ball screw assemblies with short deliveries. Hess Industries of Niles, MI one of the world’s leading suppliers of metal forming machines, contracted Barnes to design and build a ball screw assembly for their heavy duty wheel industrial equipment. The machine would require a working load on the ball screw assembly up to 1023kN (230,000 LBf). This can only be accomplished by closely controlling the accuracy of the helical raceway of the ball nut and screw, with matching thread pitch, radii and root diameters. The heavy load is then evenly distributed over all the balls in the assembly. Proper raceway hardness and case depth are also critical.

Once a design is agreed upon with the customer, Barnes begins processing the large ball screw immediately from our extensive stock of hardened and ground material. The screw thread is roughed-in on our large capacity whirling machine which facilitates the shortest possible delivery.

By whirling the thread close to the finish size, less heat is generated during final thread grinding giving a very accurate thread very quickly. The ball nut is manufactured to the exact size to match the screw and the finished components are assembled and thoroughly tested to meet the criteria of a high load application.

Barnes has made some of the highest load capacity ball screw assemblies in the world. Send us your high load application information and see what Barnes can do for you.

Product Description	New high load capacity ball screw assembly with short delivery
Capabilities applied, processes	Large capacity thread whirling of hardened steel bars High precision tolerances maintained
Tightest Tolerances	Close control of thread pitch, radius and root diameter of screw and nut Matching thread leads between nut and screw to give even load distribution
Material Used	High alloy hardened and ground bars in 40 foot lengths –on the shelf, ready for processing
Thread Cutting and Grinding	Screw roughed in a large capacity thread whirling machine CBN tooling used for rapid material removal Matrix 70 thread grinding machine used for finishing ball threads. Extensive steady rest support required Accurate hook-ups between thread ground sections Continuous thermal control during grind to insure that tight tolerances are met
Application Assistance	Engineering assistance available Dependable ball screw load and life calculations Designing accuracy into the processing of the ball screw components to insure all tolerance requirements are met Design assistance with other related machine components Designing for high loads in excess of 250,000 lbs.
Delivery Time	8 weeks or less (depending on size) Expedited service available
Delivery Location	Michigan
Project Scope	Design and build a large ball screw assembly with high load capacity and short delivery