摘要 |
PROBLEM TO BE SOLVED: To provide an inner diameter measuring device capable of exactly measuring the inner diameter of a work. SOLUTION: The inner diameter measuring device 10 supplies compressed air from one end of a work W formed in a cylinder shape and measures the inner diameter of the work W by detecting the back pressure. Before measuring the inner diameter of the work W at an inner diameter measuring part 16B, a pin 120 is inserted in the inner periphery of the work W at a foreign body removing part 16B to remove foreign body adhered on the inner periphery of the work W. With this method, an erroneous measurement due to the foreign body can be prevented and exact measurement can always be done.
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