The earliest known drill bits were made from stone or bone and were used by ancient civilizations for drilling holes in wood, stone, and other materials. These early bits were typically made by chipping away at the material until a sharp point was formed. While effective, these primitive drills were slow and labor-intensive, limiting their use to small-scale projects.
...
2025-08-15 07:42
648
As the drill operates, lubricant travels through these channels, reducing friction and wear on the rod and bit As the drill operates, lubricant travels through these channels, reducing friction and wear on the rod and bit