| 摘要 |
A centering arrangement for a drilling machine or the like mounted on a boom or jib on a truck or the like for drilling rock, for example, and in which, for centering the drilling machine, the machine is moved from a reference point on a drilling pattern plane to a reference point on a working plane, and the amount of shifting for achieving the centering is supplied to a unit for adjusting the working distance and direction values for the desired drilling point in the drilling pattern plane to achieve the working distance and direction values of the actual drilling point on the working plane. These are used for moving the boom structure of the drilling machine to the actual drilling point for quick and accurate.
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