What is an ISO Test Rotor?

An ISO Test Rotor is a special reference part, manufactured in accordance with international standards, used to test the accuracy and performance of dynamic balancing machines. It is an indispensable tool for calibrating a balancing machine and verifying that it is making accurate measurements. This rotor has specific points where known weights can be precisely added and removed. This allows the balancing machine's measurement results to be compared with the known weight values added to or removed from the rotor. This test determines the machine's measurement precision and overall accuracy.

Conducting these tests in accordance with the ISO 2953 standard guarantees the reliability and consistency of the results obtained. The ISO Test Rotor is used not only during the initial setup of a newly purchased machine but also during periodic maintenance and whenever it is necessary to ensure the machine is functioning correctly. At MBS Balance, we ensure our machines are tested and calibrated to ISO standards before they leave the factory. This way, we aim to offer our customers the highest level of performance and reliability. The ISO test rotor is a performance benchmark that indicates how reliable a balancing machine is, not just physically, but also in terms of its measurement quality.

ISO 2953 defines both the geometry of the test rotors and the tests to be applied for the acceptance and verification testing of balancing machines. The main evaluations in this standard are the machine's minimum achievable residual unbalance (Umar), the unbalance reduction ratio (URR), plane separation (cross-effect), and the unbalance indication test. Known masses are added to the test rotor at specific radii and angles and compared with the values the machine reads.

This verification should be repeated not only at first installation but also during periodic maintenance, after an accident or transport, and before critical measurements; thus the machine's calibration, which changes over time, is safeguarded. MBS Balance verifies its machines with ISO 2953 test rotors before shipment and provides the customer with a periodic verification procedure and suitable test rotor support; this facilitates measurement traceability and quality certification.