| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw hole forming method and its method capable of forming a screw hole by attaching a rasp-cut nut at a regular position even if a hole is a low finishing accuracy hole formed on stone material or glass material. SOLUTION: An adjustment screw 10 is attached in a tip of the rasp-cut nut 8. If the adjustment screw 10 is attached on a tip of the rasp-cut nut 8 in such manner, total length of the rasp-cut nut 8 can be changed by adjusting screwing quantity of the adjusting screw 10 and insertion length thereof can be adjusted. Consequently, the rasp-cut nut 8 is attached at the regular position and the screw hole can be formed, even finishing accuracy of the attachment hole 2b is low. COPYRIGHT: (C)2009,JPO&INPIT
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