Author(s)

M. Fish and R.G. Munro

Abstract

This paper describes the measurement of error sources in a worm gear set and assesses their effects when developing a computer model to synthesise behaviour. To do this several test gears have been made and the process monitored by controlled measurement at several stages using some of the most sensitive and accurate equipment available. A computer program has been written to model the characteristics of these worm and wheel gear pairs under a range of conditions. The predictions have been validated using a test rig measuring rotary accuracy of the input and output shafts under a torque load. 1 Introduction Precision worm gears are widely used in machine tools, rotary tables and robots. Normal positioning accuracy is around 7-15 arc sees, but this may be influenced by design, production and operating conditions. The geometr

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