Drilling holes on a spherical workpiece

The workpiece shown in the figure is the ball end shaft on the universal joint mechanism of a product. The material is hard aluminum LY12. Because the product is produced in small batches, it is uneconomical to design and manufacture special drilling molds. According to the principle of the cone surface positioning of the spherical workpiece, we use a steel plate with a thickness of about 8mm (the two sides are flattened) as a spacer, press it on the table of the bench drill, adjust the distance of the spindle from the workpiece, and then fasten it. After drilling the hole of φ3.5mm, change the taper surface of the drill bit (108°±1°, φ6.7_0~(+0.22)mm), then change the drill bit to φ2.9mm, and then position the workpiece ball on the tapered surface. and

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