| 摘要 |
PROBLEM TO BE SOLVED: To obtain a dynamic balancing machine by which an imbalance can be measured by a method wherein two or more kinds of test pieces whose hub inside diameter is different are used so as to be mixed and a collect chuck is replaced automatically. SOLUTION: In a dynamic balancing machine, a collet chuck 21 which is inserted into a taper part 14A at the tip of a spindle 9 is moved relatively to the taper part 14A by using a draw bar 22, its diameter is expanded, and a test piece T is gripped. The vibration of the spindle 9 at a time when the test piece T is turned by the spindle 9 is detected, and the imbalance of the test piece T is measured. A collect presser foot 212 which is moved to either a coupling position in which the collect chuck 21 is coupled to the draw bar 22 or a release position in which the collect chuck 21 is released from the draw bar 22 is placed on the collect chuck 21, The collect presser foot 212 is set to the release position, and the collect chuck 21 is inserted and removed with reference to the spindle 9.
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