Boring

Injection molding machine platens are large steel blocks that hold the mold halves. The moving platen slides on the tie bars through precision-drilled holes. The platens also need drilled cooling channels for temperature control. In my experience, the tie bar hole accuracy determines whether the injection molding machine produces consistent parts over millions of cycles. Platen Sizes and Material Specifications A platen for a large injection molding machine can be 1-3 meters wide and 30-60cm thick. The tie bar holes are 80-200mm diameter through the full platen thickness. The position tolerance between the four tie bar holes is typically within 0.1mm. ...

Railway wheel sets consist of two wheels pressed onto an axle. The wheel has a bore that is precision-machined to an interference fit with the axle. The bore tolerance determines whether the press fit holds the wheel securely in service. In my experience, the boring operation is the most quality-critical step in wheel set manufacturing because once the wheel is pressed onto the axle, an incorrect bore cannot be corrected without scrapping components. ...