To provide a hole working method of a large part and a working device short in working mandays and favourable in precision of a drilling position by applying hole working or tapped hole working on the large part by the working device which is the working device to be used at the time of working a hole on the circumference of a through hole of the large part, having a bush to support an axis of rotation on the large part or at the time of reproducing a tapped hole of a new female screw at the time of exchanging it with a new bush after periodical inspection.
This is a device to work a hole formed on the circumference of the through hole of the large part having the through hole. The device to work the hole has a fixing jig free to press fit and connect flanges onto both opening surfaces of the through hole by a fastening means free to adjust a pair of the flanges and their interval. It is constituted to be furnished with a drilling means to be supported by a magnet pedestal free to be magnetically attached and directed to the hole on the flanges of the fixing jig.
KANEDA MASAO
SUZUKI ICHIJI
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