Roller screws deliver four-times higher thrust

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A pharmaceutical tablet manufacturing machine is benefiting from a set of bespoke satellite roller screws from Abssac, which can handle four times higher axial thrusts than comparable ball screws.

Roller screws deliver four-times higher thrustAbssac has supplied a bespoke set of satellite roller screws to a pharmaceutical company to provide precision axial movement in the enhanced manufacture of tablets. Two features of the application that had to be overcome were a severe restriction on the space available and a requirement for a high axial thrust.

Using the standard RV series with a flanged mounting nut meant that the physical roller screw's nut diameter could be significantly smaller than if a traditional style of ball nut had been utilised. Additionally the roller screw enabled up to four times the axial thrust capacity to be delivered compared with the equivalent ball screw and nut design.

Satellite roller screws have precision rollers instead of ball bearings in the nut housing. The rollers transmit the load between the nut and the screw. Since the rollers are constantly engaged with the threads of the screw, this results in a high number of contact points - which allows the satellite roller screw to support heavier axial loads and have much greater longevity.

Interestingly, when the screw turns, the satellite rollers move as the lead on the screw and the rollers do not move axially relative to the nut and are not recycled.

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