SUPER-STAR 5-point star shaped drill holes with inward curved walls are of ultrasonic machining. (Below) In 2017, I saw this image of a star-shaped drill hole in granite from Massachusetts having inward curved sides that could not be recreated by any natural means nor any conventional lapidary method, so I engineered how to recreate them […]
Supersized star-shaped drill hole in Rockport, Indiana. Read More »










