Satellite roller screws claim superior linear motion

For those seeking enhanced linear performance within their applications, through trusted engineering support, then the satellite roller screw program is worth considering, states ABSSAC. “With a proven pedigree in application placement, the satellite roller screw program offers a unique precision linear device that accurately transforms rotary movement into a linear motion.”

Utilising internally captivated threaded rollers that sit between the screw and the nut dramatically increases the high number of points of contact within the load bearing system. “This mechanical advantage enables satellite roller screws to support very heavy loads with precise and reliable motion. Meticulous attention to detail during manufacture, backed up with hard earned application experience, delivers a formidable linear package.”

Accuracy under stress

Satellite roller screw designs deliver accurate linear position at speed, even under considerable loads. The lead of roller screws (axial travel per revolution of the screw) can be manufactured with finite tolerances and achieve outstanding lead accuracy. Typically, leads are limited to 1mm for small diameters of the standard RV satellite series, as this is primarily due to the fact that they are multi start thread forms.

Since the thread pitch is dened as a function of the lead, divided by the number of starts. RVR recirculating screws are single or double starts, which give a pitch equal to or at least half the designated lead.

“However, the RVD differential screw series can be supplied with a lead a few hundredths or tenths of mm, if required, something that is not available in ball screw designs. Interestingly with satellite roller screws, the lead can be chosen without any geometrical changes to both the screw shaft and the nut body, which allows design iterations whilst having no effect on performance or load capacity.”

Limitation factors

Within a ball screw design, however, the minimum lead will be limited by the size of the ball that can t in the thread form, adds ABSSAC. “Adversely, the smaller the lead for ball screws, the smaller the capacity rating. Reliability, longevity and precision are the pillars of strength for the product, where ball and lead screw products cannot compete.”

Where the Rollvis roller screw product really excels is in the tailored linear solutions, where incredibly tight tolerances need to be achieved. Using state of the art CAD and manufacturing techniques has enabled the product to be placed in many critical operation applications where confidence is taken in the products quality and capability.

All parts are manufactured in a temperature-controlled machining environment, and both screws and the internal rollers within the nut housing are manufactured by a grinding process. Having the capability to design both the screw and nut to suit a particular application often brings enhanced strategic performance, adds the company.

Key roller screw facts

• Full bespoke design capability
• High rotation speed (RV types)
• High acceleration capacity
• Accuracy 23µm/300 mm as standard (6µm/300 mm or better on request)
• Small leads (from 0.25 mm) with large diameters (RVR types)
• Fine leads (to 0.02 mm) with medium diameters (RVD types)
• High axial load capacity
• Long lifespan
• High efciency
• Zero backlash designs
• Extremely high rigidity.