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For many years, the Company SCHERDEL has been supplying spiral spring weight balancers for machine tools and medical applications.
The system provides a counterforce to the moving mass at a vertical axis.  The force is transferred via a toothed belt which runs on the casing of a pre-tensioned spiral spring. The idea is to compensate the mass and to reduce the strain on the vertical moving drive.
The spiral spring weight balancers for machine tools are suitable for both the linear direct drive and the ball-screw drive.


The key aspects of quality, precision, cost effectiveness and environmental protection inspired SCHERDEL to develop spiral spring weight compensation.  It compensates the mass being moved at the axis, i.e. the linear motor is only responsible for the differential forces. With machine and system manufacturers attempting to capitalise on energy efficiency, sustainable environment protection (“hydraulic-free machine”) and cost optimisation while still improving the level of performance, the spotlight has been firmly put back on this solution.  The spiral spring weight compensation can be used for all kinds of machine tools, like milling, grinding, turning and special machines, as well as for machining centres and systems in general. Principally, it can be used wherever heavy loads or components need to be moved.


Maximum stroke: 540 mm
Maximum weight to be compensated: ≈ 100 kg per spring (4 springs max. per unit).
It is possible to combine several units (modular design principle).
Outer diameter: 220 mm
Maximum drum length: 334 mm
The length of the toothed belt (profile: AT10) can be adapted to the machine.


Advantages compared to hydraulic or pneumatic weight balancers:
No switching times for valves
No stick-slip effect
High energy efficiency
No inertia of mass and no internal friction
High lifetime and no maintenance
No connecting wires, valves and hydraulic oil necessary.
Improved NCG test

Advantages for the customer:
Less expensive to purchase
No maintenance costs
No energy costs during operation
Less energy costs for the drive
High level of dynamics, almost no hysteresis
Simple integration
for machine tools