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ball screws
- Posted: June 22, 2016
In many devices lead screw assemblies are used to convert motion from rotary to linear and vice versa. Historically these assemblies have had poor efficiencies and relied on grease for improved performance.
Over the past few decades the advent of engineered polymers and new manufacturing capabilities have changed the game for the conventional lead screw assembly making it a powerful solution for motion based design challenges.
At first glance lead screw assemblies seem rudimentary, but they are designed to perform a very specific function, and even with the latest developments in materials and manufacturing processes having a basic understanding of how lead screws operate can be the difference between a successful design and catastrophic failure.
...Categories: Technical Support - Posted: May 14, 2015
A compression load is a force that tends to compress, or buckle a ball screw shaft. If a compressive force is applied to a screw that exceeds its column strength, the ball screw will bend and cause premature or permanent failure. This can happen in either horizontal or vertical applications. In some cases, you may have to select a more rigid end support housing arrangement, and/or a larger diameter screw in order for the ball screw assembly to withstand your compression load.
If a sufficiently heavy load is applied to a nut with a long ball screw in a horizontal application, the ball screw could buckle. In a vertical application, if a fixed or rigid motor driven housing is mounted below the ball screw...Categories: Technical Support - Posted: October 16, 2013
The main function of Ball and Acme (Lead) Screw Assemblies is to provide a drive mechanism, usually within a positioning table, to move a load. The drive mechanism is an element that contributes to position accuracy, repeatability, speed, and mechanical system resolution.
Ball Screws are the screw of choice for high duty cycle, high speed, and long life applications. The ball screw nut uses one or more circuits of recirculating steel balls which roll between the nut and ball screw grooves, providing an efficient low friction mechanical drive system. The nut, which is attached to the table carriage, moves back and forth in parallel with the linear bearing system as the ball screw rotates. Using a higher lead ball screw (for example a 0.500 inch lead instead of a 0.200 inch lead) will offer greater carriage speed for applications requiring rapid traverse, or fast, short incremental moves. Key features of a ball screw system are low wear and long...Categories: Technical Support