| 摘要 |
Disclosed are an apparatus and method for making a sheave by forming an external annular radial groove in the periphery of a circular workpiece. The apparatus includes a support for supporting the workpiece for rotation about its own axis. At least one groove-forming tool having a working surface for extending radially into the periphery of the workpiece is carried by a tool guide adjacent the support for movement past the workpiece in a path such that the outer extremity of the working surface passes generally tangentially to the locus of the bottom of the groove to be formed. A tool drive assembly is provided for moving the tool in such path. A pair of drive rollers are mounted on the support for rotation about respective axes disposed angularly with respect to the axis of the workpiece and having respective opposed drive surfaces for engagement with opposite sides of the workpiece distal its axis. Drive mechanisms are provided for rotating the rollers about their respective axes and also moving them generally radially outwardly with respect to the workpiece toward the working surface of the tool.
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