ClipArt ETC
A milling ball bearing to create a small circular hole, as shown in (A). The milling ball bearing has a spherical tip with groves creating holes.

Milling Ball Bearings

A milling ball bearing to create a small circular hole, as shown in (A). The milling ball bearing has…

"Where pins or studs that are in place are to be milled on their ends as well as on their circumference, and where great accuracy in diameter and length are required, the best tool to use is that here shown." —Grimshaw, 1902

Hollow Mill for Pins

"Where pins or studs that are in place are to be milled on their ends as well as on their circumference,…