| 摘要 |
Apparatus for checking the dimensional accuracy and/or measuring the dimensions of large objects (1), provided with checking points which serve as or carry suspended measuring scales (2-7) comprises at least one beam-projection unit 12, 20 movable along a guide 8, 9 to emit a narrow beam of light at an angle to the guide. The position of the projector unit is optically or magnetically readable automatically and is stored in the memory of a calculating unit into which measurement data of an undistorted object can also be entered. The projection units 12, 20 also comprise devices for determining beam angle. From measurements on one checking point the apparatus calculates the spatial location of that point and the correct apparatus setting for other points. When the apparatus is set on other points, the correctness of the position of the point is indicated optically or accoustically. <IMAGE>
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