Measurement of timing belt angle transfer accuracy in angle metrology applications

The use and characteristics of timing belts are well-known for power transmission, but data regarding their suitability for use in dimensional metrology is far less available. In specific applications, e.g., when comparative measurements are wanted, a mechanical system capable of accurate angle transmission is needed. While belt drives offer excellent flexibility and low cost, their absolute accuracy of angle transfer is not widely researched which makes them difficult to use in precision engineering applications. To improve this lack of information, a comparative measurement system with integrated belt transmission was designed and built. The system comprises of two rotary axes, belt tensioning force adjustment mechanism and force measurement stage. Using this system, a standard timing belt was characterized with respect to the angle transfer error, and the relationship between angle transfer error and belt tensioning force was determined. These measurements provide a detailed insight into the key metrological characteristics of a belt drive system.