| 摘要 |
PURPOSE:To make a work part machinable from both sides in setting the work only once, by positioning the work part of a wheel disc to a rotary tool, and making it retreat from an axis of the tool at the time of machining. CONSTITUTION:To clamp a work for positioning by a jig, a positioning pin 144 is fitted in either of the hole parts of a stepped hole part of a work. After the work is positioned and clamped to a mount, a cylinder 154 is driven, and when a piston rod 156 is displaced in an arrow direction, a moving plate 162 is guided by a guide bar 160 and displaced in the arrow direction. Therefore, a positioning pin holder 134 is pressed in the arrow direction via an engaged part 164, whereby this positioning pin holder 134 is guided by a guide pin 146 and a guide groove 132, and retreated from the work as far as the specified distance for displacement, while a key 150 is separated from an interval between guide plates 148a and 148b. Accordingly, a setting part 138 and the positioning pin 144 both come to retreat from on either axis of a stepped part of the work in consequence.
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