| 摘要 |
A tool for simultaneously machining two opposing edges of the end face of a horizontal plate is disclosed. The tool comprises two machining means, rotatable about a vertical axis; the lower machining means is at a fixed vertical position, while the vertical position of the upper machining means varies in conformance with the top surface of the plate, by being part of a vertically sliding subassembly that comprises one or more rollers and means to press the subassembly downward so that the rollers continuously touch the top surface of the plate. |
