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Ball screws are available in all matter of diameters and pitches and for 99.9% of applications a slight adaptation to a standard program can satisfy that demand. However, with well over three decades of supplying ball screws, occasionally a new design is required. This demand can be driven by application parameters such as a unique speed, a high duty cycle or even an unusual loading characteristic. Perhaps a special fixing of the nut design or even a different material requirement can require an out of the box solution.
Here are a few examples of where we have assited in machine design and the placement of bespoke ball screw designs. Some applications have required the reverse engineering of a provided sample, some aplications have required unique design to suit specific application requirement. Let our engineers work with you to find a cost effective solution.
Recently a customer wanted the ball screws and nuts finished in electro-deposited black chromium finish. The 1 to 2 micron surface treatment does not affect the accuracy of the ball screw but enhances its long term corrosion resistance. When supplying this surface finish, both the screw and nut body would be black chromium and then used in conjunction with stainless steel ball bearings.
During a recent design brief with one of our packaging machinery customers, a new range of machines were being designed with exceptionally long MTBS. (mean time between service). In fact, the machines unique selling point was to be its reliability and long service intervals. The ball screw to be used would also provide the primary linear movement required within the design, so was a critical part of the design guarantee. Typically our ball screws are rated for millions of mm’s of travel at the rated dynamic load. This is the load at which 90% of a group of identical ball screws will run without flaking for their lifetime. However, they will travel farther than this at lower limits. These load-life relationships are analogous to the B10 rating common in the ball bearing industry. The relationship of load to life is an inverse cube relation. For example, by reducing the customers load by half would increase the life by eight times. (Conversely doubling the load would decrease life by 1/8). An adaptation of an existing ball screw design, quickly satisfied this customers requirements.
Abssac has just added the new M-Thread, 15mm diameter end deflector ball screw, which can accept higher speeds and greater dynamic and static loads than its competition. Available in both ground and rolled formats standard leads of 2.5mm, 5mm, 10mm and 20mm can be supplied. The new product is offering an accuracy grade of C3, C5 in the ground format C7 and C10 in the rolled format.
The worlds smallest ball screw, with 1.8mm outside diameter screw