Abstract
A new method for measuring the dynamic transmission error between a hob and worktable in large gear hobbing machines is described in which a pair of small, highly sensitive servo-accelerometers are mounted tangentially, 180° (arc degree) apart, on the periphery of a large worktable, in order to detect rotational fluctuations of the worktable. Two acceleration signals from the servo-accelerometers mounted on the worktable are summed in order to determine the circumferential acceleration. The resulting sum will nullify the rectilinear acceleration of the worktable. After the circumferential acceleration signal transmitted by a telemeter is processed by a pulse signal from a rotary encoder attached to the hob shaft in this apparatus, the dynamic transmission error can be obtained. In tests using a large gear hobbing machine (3.3 m worktable diameter), the dynamic transmission error has been measured and recorded. By processing the recorded analogue signal with an FFT (Fast Fourier Transformation) analyser and by consulting the schematic drawing of the rotational transmission mechanism, specific parts in the mechanism causing the transmission error can be identified. Also, by processing the circumferential acceleration signal of the worktable from a standing start with an FFT analyser, the rotational natural frequency of the worktable can be easily obtained.
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