Reconstruction of Z100 radial arm drilling machining turret bearing seat plane

During the training at the Mechanical Equipment Repair Factory of the Port Authority, I had the opportunity to take part in the technical upgrade of the Z100 radial drilling machine. The objective was to use this machine to mill the rotating surface of a door machine, which is a key component of large-scale port lifting equipment. Due to its massive size and weight, the door machine cannot be transported into a regular workshop or processed by standard machine tools, making the task significantly more challenging. Specifically, the turret bearing seat on the turntable and the cylinder have a diameter of 4,200 mm and a flatness requirement of 0.3 mm. These parts are critical components that must align precisely with the slewing bearing, requiring high accuracy. After working closely with the factory’s technicians, we successfully modified the Z100 radial drill and completed the milling of the rotating plane. By implementing improved testing and correction techniques, we achieved a flatness of less than 0.2 mm, which not only met the design specifications but also saved a significant amount of time and cost, resulting in substantial economic and social benefits. **1. Technical Parameters and Sketch of the Door Turntable Assembly** The dimensions of the 4043 door machine turntable assembly (see Figure 1) are 13,220 mm (length) × 10,146 mm (width) × 4,024 mm (height), with a weight of 124,512.1 kg. The surface dimensions of the cylinder bracket to be machined (see Figure 2) include an outer diameter of 4,040 mm, an inner diameter of 3,600 mm, and a height of 1,506 mm. The end of the cylinder to be processed (see Figure 3) has an outer diameter of 4,282 mm, an inner diameter of 3,600 mm, and a height of 1,800 mm. **2. Analysis of the Pre-Improvement Situation** Due to the large size and weight of the door turntable assembly and the cylinder end, there was no prior experience or suitable equipment available for machining. As a result, external processing would risk delaying the qualification of the door machine, so it was necessary to modify the existing equipment. The goal was to ensure that the flatness remained within the required 0.3 mm tolerance. After careful consideration, the Z100 radial drilling machine was adapted according to the workpiece dimensions. The Radial Drilling Machine (see Figure 4) has dimensions of 4,390 mm (length) × 50 mm (width) × 4,130 mm (height). Its spindle can span between a minimum of 540 mm and a maximum of 3,000 mm, with a working height ranging from 440 mm to 2,100 mm. For more detailed information, please download the attachment or refer to *Metalworking (Cold Processing)*, Issue 19, 2013.

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