Automatic drilled holes position correction for a ship window

The article presents how to measure and correct the position of the holes on the example of the ship window frame. Ship window frame is manufactured from welded blank and then bent on the bending machine and welded. In order to minimize shape deformation the frame is straightened by hand. Linear dimensions of the frame are about three times larger than the dimension of the location of the holes relative to the edge of the frame. The quality criterion for ship window requires all drilled holes to be located in a straight line. To reach this goal a special procedure was developed to distribute holes in the frame on the base of the window frame shape deviations measured first before drilling. In the following section design of a special machine tool– coordinate drill equipped with a measuring head, as a unit being able to measure and drill automatically. It allows to shuttle processing of frames and to simplify their identification. Construction of the drive and control machining is also presented. The machine has been implemented in a local company, which is a global leader in the production of ship windows.