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In this case study, learn how Steinmeyer used its full capabilities to meet this challenge. We designed and assembled an innovative, multi-axis system, driven by ground, stainless steel ball screws.
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You will learn how mechanical engineers at a major OEM increase system speed and flexibility to satisfy the demands of high-throughput customers.
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Ball screws classified as “double nut” appear to be aptly named. However, what seems to be a simple distinction varies from one vendor to another. Let’s clarify the true definition of a double nut and the unique features of Steinmeyer designs.
Taken literally, a double nut is composed of two separate nuts that are more or less identical. The purpose of this design is to preload the two nuts against each other and achieve two-point contact on the balls. Preload eliminates play and helps build additional stiffness, keeping the nut centered on the shaft. While there are many ways to achieve preload, Steinmeyer defines double nuts as those that have two-point contact. This makes sense as it describes the double nut from a performance point-of-view, regardless of the design details.
The main design challenge involving double nuts is how to join them. Various solutions have been developed around the industry to solve this issue, but most require complex joining with spacers, shims, fitting keys, pins, and setscrews. We believe in a simpler approach.
Steinmeyer’s patented UNILOCK coupling system avoids complicated hardware by using a special epoxy. It is proven to deliver a robust connection of the two nut halves, making our double nut nearly as compact and stiff as a single-piece design. It also prevents radial slippage of the two halves, so that the UNILOCK double nut cannot be misaligned. The coupling is rugged and absolutely tight to prevent the loss of lubricant.
Contact our motion control engineers to learn the benefits of UNILOCK for your application.
In recent years, ball screws have been looked at more and more favorably as replacements for hydraulics. They offer higher efficiency and speed, and can be controlled more precisely with servo loops. And who wants to deal with the unavoidable maintenance and disposal hassle of hydraulics?
Steinmeyer has been supporting this market shift with its line of Ultra Thrust ball screws. These screws utilize larger balls to support much greater load capacities. More recently, we have introduced innovations in through-the-nut return systems to push performance even higher.
The Ultra Thrust line began with our 50×20 mm nut using 15 mm balls. Our standard nut of that size, with 9.5 mm balls, was rated at a dynamic capacity of about 120 kN (12 tons). But the Ultra Thrust version exceeded twice the capacity, reaching 262 kN. We then expanded the line to include larger nuts. Most of our Ultra Thrust screws in the field are sized at 80×20 or 63×20.
More recently we extended the line with a 100×25 mm nut, using 19 mm balls. These screws have proved themselves in the most demanding applications of injection molding.
Beyond increasing the ball diameter, Steinmeyer has designed new return systems to optimize the load capacity. Our latest innovation uses multiple through-the-nut return paths, shown in the schematic below. With this system, the screw exceeds 1,400 kN of dynamic capacity!
Steinmeyer is recognized worldwide as an elite supplier of premium engineered products. The company enjoys a century of designing and manufacturing precision tools and components in Germany. Throughout its long history, Steinmeyer has been family owned, operating under the leadership of the Beck family since 1940.
Ball screws have been the company’s primary product line for decades, and the Steinmeyer brand embodies precision and quality. It also reflects a strong dedication to helping customers achieve engineering excellence.
Steinmeyer’s leadership is personally engaged in each customer’s success, and is uniquely qualified to deliver a product that meets exacting standards without compromise on quality, durability, and precision.
Steinmeyer has continually invested in manufacturing capacity and technology, maintaining the most advanced facilities in the world. Global service and support provides customers with access to the technical resources to guide their requirements.
Steinmeyer’s commitment to financial stability ensures that the company has the proper resources to invest in its facility and personnel without passing along costs to the customer.
All of these qualities have allowed Steinmeyer to successfully serve the most prominent customers in our target industries.
Learn more: http://www.steinmeyer.com/en/company/philosophy/