| 摘要 |
A method for, without contact and with the aid of a measuring device, measuring in connection to an envelope surface of a measured object with respect to its cylindricity and/or its straightness relative to a straightness reference arranged parallel with the axis of rotation of the measured object, which measuring device besides said straightness reference comprises a measuring stand and a measuring carriage at which at least one measuring means is arranged, which measuring carriage is traversed along a support member parallel to said axis of rotation. According to the invention the measurement commences with a starting position for the measuring means relative the straightness reference and the measured object being determined, whereby a first measurement is performed for this starting position, after which the measuring means is moved to a further position along the support member while these new positions are continuously determined relative each other or said starting position, whereupon a measurement occurs. A laser beam is used as straightness reference, said laser beam being protected from external influence along at least a part of its length by a protective device. The invention also relates to a measuring device of the type described.
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