Biconical drilling

From WebRef.org
Jump to navigationJump to search

a means of perforating beads or pendants for suspension. Accomplished by drilling in from both sides with a tapered drill resulting in an hour-glass-shaped hole.

Retrieved from "http://www.webref.org/wiki/index.php?title=Biconical_drilling&oldid=163938"


Sponsor: Recover any lost or forgotten password from ZIP/WinZIP/7Zip archives.

Engagement rings and fine jewelry.