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Ball Screws


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Ball screws that have been formed by a grinding process are used where acute linear accuracy is paramount within an application. We offer a quality program of metric threaded screws, with a variety of standard and bespoke ball nut designs. Diameters from 1.8mm to 16mm and leads of 0.5mm to 30mm are available with accuracies of C0 to C5. All ground ball screws can be supplied cut to length, with end journals machined ready to fit into an application.

Cold rolled formed ball screws 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 a high degree of repeatable accuracy. Utilising a wide range of ball nut designs, diameters from 4mm to 80mm and leads of 1mm to 50mm are available with accuracies of C7 to C10. All rolled ball screws can be supplied cut to length, with end journals machined ready to fit into an application.

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 with C7 accuracy. Leads of 1mm to 50mm are available through a large range of ball nut designs which in many any cases utilise multiple ball circuits to achieve greater load capacities.

HAVE YOU HEARD?

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....

Ball Screws

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.


Life Expectancy


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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