MEASURING METHOD FOR OUT-OF-ROUNDNESS OF PRECISE MASS-RPODUCED PARTS

摘要

PURPOSE:To easily measure the out-of-roundness of every workpiece by measuring the time from when the difference between a measured value and a reference value becomes zero to the end of polishing. CONSTITUTION:When a workpiece 11 is inferior in work precision or not round, a potential difference Vc detected by a constant size controller 10 varies to the minus side continuously even after the potential difference Vc becomes zero, and when its minus-side variation reaches a quantity corresponding to an error in out-of-roundess, a polishing end signal is generated. Therefore, the large minus-side variation in potential difference accompanying the end of polishing appears after the potential difference Vc becomes zero. The delay time is measured by a counter circuit 22 and when an output signal corresponding to the delay time is larger than the output signal of a constant value generation signal 26, a relay 28 is excited to select defectives by an air cylinder 30 accurately.