PDU2M Added To Belt-Driven Linear Motion System

Hepcomotion has introduced the PDU2M to its Profile Driven Unit (PDU2) belt-driven linear motion system. The company said the PDU2M delivers a 200 per cent increase in moment load capacity and 1000 per cent uplift in moment load stiffness compared to a standard PDU2. Direct load capacity is also 50 per cent greater. In practice this means, for example, that designers can use a single PDU2M unit as a horizontal axis in an X-Z system, where previously two PDU2 units working in parallel would have been required to provide the necessary rigidity and strength.

Key to this capability is the high-performance Hepcomotion Herculane wheels that are mounted on adjustable eccentric studs. These wheels run virtually friction-free on the inside of the profile, providing stable support for the carriage plate. Felt wipers sweep debris from their path. The unit is available with a number of carriage designs to allow the quick and easy construction of multi-axis systems with a minimal requirement for brackets and other hardware.

In common with its forerunner, PDU2M comprises a rigid but lightweight aluminium slotted profile into which fits the toothed belt drive and carriage, an arrangement that effectively encloses the unit. It is rated for operating at speeds of up to 6m/s and available with a choice of motors providing driving forces up to 280N. The options include a Smart Drive Taranis stepper-motor drive and control package for multi-axis applications.

Left, right or double drive shafts can be specified together with a range of options such as brakes, positioning encoders and mechanical or inductive limit switches. End-of-stroke protection is provided as standard at both ends by internal buffers. PDU2M is fully compatible with the company's MCS aluminium machine-construction system and is expected to find its niche as a replacement for failing ball-based systems.

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