Slim makes dynamic

Lift-and-turn modules

16.04.2018, 18:29

Slim makes dynamic

Philipp Hafner in Fellbach, a manufacturer of production measurement technology, uses new linear rotary modules from Dr. Tretter. They perform linear and rotary movements as well as positioning movements in one compact unit.

The new linear rotary modules implement linear and rotary movements as well as positioning movements in one compact unit. (Image: Dr. Tretter)

Because the designers can build extremely slim machines, the machine works very dynamically. Users achieve fast cycle rates and high energy efficiency. The special feature of these elements: Together with the torque shaft, the spindle forms a single unit. This allows them to implement both separate and combined motion sequences such as positioning, linear and rotary movements. Designers can thus implement dynamic applications, particularly in automation technology, and at the same time achieve positionally accurate motion sequences. These units transmit torques with simultaneous translation and can support them. A ball screw drive is combined with a torque bushing for this purpose.

As with the ball screw drive, a helical groove is ground into a solid shaft, plus four longitudinal grooves as with the torque shaft. Two rotatably mounted flange nuts are arranged on this shaft. One nut acts as a ball screw nut, the other as a torque bushing. Both are driven by a servomotor using a toothed belt. If only the spindle nut is driven, a pure stroke movement of the shaft takes place and the piston is lifted. If both nuts are driven synchronously, this results in a pure rotary movement of the spindle. To implement the different movement profiles, only one shaft is required for the linear rotary modules. If this is designed as a hollow shaft, the energy supply line can simply be routed through it. pb

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