Abstract
The measurement of generating accuracy is considerably difficult because of the very low rotational speed of the worktable. So, results of the actual measurement have scarcely been known so far. By employing the rotational speed meter which was newly developed the author has succeeded in recording simultaneously the rotational error of both the worktable and the hobb shaft not only during an idling time but also during machining. The results were analyzed with a real time frequency analyzer and the cause of both rotational errors was inferred by examining their power spectra. As a result, the variational component caused by the working V-belt was recognized in the rotational error of both the worktable and the hobb shaft under the idling condition. While, in the machining condition, the intermittent cutting force caused by hobb's cutting edges causes the rotational error of the worktable. That of the hobb shaft consists of numerous variational components caused by the fiappering of driving gears in the vicinity of the contact frequency of gears. Also, it was newly ascertained that a qualitative coincidence existed between the tooth profile estimated by the measured relative rotational error and the test result of the tooth profile generated by the machine.
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