| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact tap machining device that allows high speed machining and can be built in a press by rotating a screw shaft and a nut shaft of a ball screw at different rotation speed by combination of different gears and by providing a tap tool with a predetermined rotation and feeding by the rotation difference. SOLUTION: A second screw shaft 35 and a second nut shaft 32 of the ball screw are rotated at the different rotation speed by the combination of different gears G4, G6, G5, and G7, and the predetermined rotation and feeding are provided for the tap tool T by the rotation difference. Therefore, speed of the tap machining can be increased and a compact unit constitution is allowed.
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