Screw-driven linear actuator with wide choice of screws

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HepcoMotion's versatile PSD80 screw-driven linear actuator is available wide range of screw options. A high lead model, for example, enables direct coupling of a stepper motor to create a cost-effective linear actuator. The unit can also be specified with opposing left- and right-hand carriages as a double-acting (biparting) version. As a result, the application scope of this product ranges from light pick-and-place and assembly operations involving XYZ movements, through to instrument positioning systems. And in double-acting format, it is suitable for use as a specialised door and shutter opening and closing mechanism, as well as for width adjustment and measurement systems.

The PSD80 was primarily developed by HepcoMotion around the need for a low-cost Z axis for applications in which loads are relatively light. It complements the company's established PSD120 ball screw actuator and PDU2/PDU2M belt-driven units. In comparison with many other products on the market, the PSD80 requires little or no maintenance, providing long and reliable service even without lubrication.

This addition to HepcoMotion's range incorporates a screw drive with a range of lead options from 4mm to 70mm, with the 25mm lead being particularly useful for Z axis applications; where higher-speed pick-and-place performance is required, the 70mm lead can satisfy this need. When directly coupled to a stepper motor, the 70mm lead screw option will enable speeds approaching 1m/s to be achieved. Its competitive price is said to make it a viable alternative to single-position pneumatic-driven Z axes. Indeed, for such an application the PSD80 is claimed to provide a better response time as well as greater consistency and positioning accuracy.

Choice of formats

The Herculane linear motion wheel technology introduced by the PDU2 belt driven family of actuators is also responsible for the fit-and-forget performance of the PSD80. As standard the PSD80 is supplied as a closed unit to prevent debris from compromising its reliability. However, for applications where dirt ingress is not a design consideration, an open format is also available. In both forms the unit can also be specified as a slave, where two units are used in parallel.

A typical multi-axis application for the PSD80 would involve fitting the screw-driven unit to a single PDU2M high moment load unit that is providing the Y-axis movement. This allows two standard PDU2 belt-driven actuators to be used in parallel in the X axis. The whole assembly can then be mounted onto a HepcoMotion MCS framework to provide a highly cost-effective XYZ system that would typically be driven by stepper motors.

The application flexibility of the PSD80 is also enhanced by its availability as a completely corrosion-resistant product. As standard the screw is stainless steel.

Furthermore, the PSD80 actuator can also be supplied with precision ball screws for applications requiring greater positioning accuracy.

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