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Servobelt belt-drive improves dynamic performance

A McLennan Servo Supplies product story
Edited by the Engineeringtalk editorial team May 27, 2009

McLennan Servo Supplies has released a long travel belt-drive system that offers higher dynamic performance, increased accuracy capability and improved repeatability.

The Servobelt, from Bell-Everman, uses a design based on two steel-reinforced polyurethane timing belts that are meshed and guided through a servo-driven toothed roller and idler system.

This idler system is held within a carriage supported on linear-motion guide bearings and a Bosch 45 series T-slot extruded profile.

As the active belting under tension is effectively restricted to less than 75mm, regardless of the travel range, an increased and uniform stiffness is possible when compared with conventional belt-drive systems.

This means servo tuning can have higher gain factors and superior settling times, significantly increasing dynamic performance throughout the travel range and allowing smaller power motors to achieve the same results.

The design also improves positional accuracy and repeatability specifications for belt-driven systems, particularly for longer travel applications.

The standard Servobelt covers travel ranges from 340 to 6040mm in 60mm increments and has an out-of-the-box bi-directional accuracy to +/-60 microns, unidirectional repeatability of +/-10 microns, acceleration to 4g and speeds to 5m/sec.

The adaptable Servobelt can be configured for single axes or for multi-axis Cartesian robot systems complete with energy-chain cable management if required.

The carriage has NEMA 23 and 34 frame-sized servo-motor mountings with a choice of five motor power-ratings available with 16000 and 20000 line rotary encoders.

A range of standard and wrap-around rail options are available with single or dual linear-motion guide bearings.

Servobelt technical data, available from McLennan, includes motor sizing for peak axial thrust up to 889N and load ratings for pitch, yaw, roll and shear-type offset loads; and for normal loads with moving mass up to 5.35kg.

The design can also accommodate multiple moving carriages on the same axis for increased versatility.

It can also fit multiple motors to the same carriage for increased thrust.

Carriages can move or be held fixed with moving rails - allowing a host of design possibilities for large-format handling and assembly systems in packaging, processing and manufacturing equipment.

The low-maintenance Servobelt system is lubricated for life with stainless-steel hardware for maximum durability.

Options include adjustable limit sensors.

Performance enhancement can yield an axial repeatability of just two microns with a one-micron linear-encoder option; higher speeds are available on request.

McLennan can also help design and commission complete systems and can supply ancilliary equipment to complement the installation of the Servobelt system.

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