Ball screws that have been formed by a grinding process are used where acute linear accuracy is paramount within the application. We offer a quality program of metric threaded screws, with a variety of ball nut combinations. The following series are available in the ground screw format.
SG Compact Flange Mount Nut - C3 or C5 accuracy - 3mm diameter up to 15mm diameter screws. Screw leads from 1mm up to 12mm. Using the flange on the nut for attachment
Ball screws that have been cold rolled formed are ideal for applications that do not require the finite accuracy of the ground ball screw equivalents, but are still required to reliably transmit a linear load with high degree of accuracy. The following series are available in the precision rolled screw format.
SR/SSR with Flanged Mount Nut - C7 accuracy - 4mm diameter up to 15mm diameter screws. Screw leads from 1mm up to 20mm. Using the flange on the nut for attachment
Abssac offers an Industrial ball screw range that effectively converts high torque rotary input into precise high load linear movement.
All industrial ball screws can be delivered cut to length and if required, machined ready to fit into the required support bearing mounts. Utilising the recirculating ball bearing nut technology as the base of the product, the Industrial class ball screws encompass screw diameters from 12mm up to 80mm as standard. In many cases multiple ball circuits, per ball nut, are employed to achieve greater load capacities making the product suitable for many types of application.
With all of our customers, Abssac strives to keep them happy. When it comes to Ball screws for miniature high accuracy to heavy duty industrial applications, Abssac is the place to come for fast delivery, keen prices and knowledgeable sales staff. Ground and Rolled ball screws are our speciality. So if you are a user of ball screws, give us a call to see how we can make your requirements heard....
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Published: Tuesday 19th April 2016
The low friction within ball screw designs means that a high mechanical efficiency is delivered compared to that of lead screw designs. A typical ball screw may be 90 percent efficient, versus 50 percent efficiency of a lead screw of equal size. Ball screw specification is often a result of an applications requirement to have smooth, accurate and repeatable linear movement. A recent application for Abssac specified a precision ball screw within an electronic microscope that placed a precision guillotine against test pharmaceutical materials. Extremely fine slithers of test material are then cut off the material in rapid succession for microscopic investigation. A small variance in the sliced materials overall thickness would have had a detrimental effect on the accuracy of the microscopes results. The application demanded a high degree of repeatable accuracy and a precision ball screw could also satisfy the other design prerequisites for it to be compact, quiet and cost effective. By using precision ground ball nuts and then pairing them with precision cold rolled ball screw threads, Abssac could provide a ball screw with lead accuracies of less than 52 microns of error for 300mm of linear travel. By utilizing both ground nuts and rolled screws formats enabled large cost savings, when compared against a completely ground ball screw equivalent. Abssac has well over 30 years of experience in supplying precision ball screws. Typically, ball screws with an outside diameters in the range from 1.8mm to 25mm for the precision ranges and up to 80mm on the transport ranges, each with a range of leads per diameter can be supplied. Abssac’s ball screw customers often request that the journal ends of the screws are supplied pre-machined, so that the parts are ready to fit. This eliminates potential scrap rates for the customer but also ensures that the assemblies are supplied and certified to the accuracy tolerances required.
Abssac is often asked about the life expectancy of the ball screw products it supplies within applications. Whilst this can sometimes be a difficult thing to accurately calculate, as parameters within an application can change during its life, it can nevertheless be achieved. 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).
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