Room-Temperature Imprint Lithography

Dividing attachments for angular indexing in which the attachment is provided with two coaxial plates, in one of which spherical indentations extend along a circumference, while in the other balls are fixed for entering the indentations of the first plate. The indentations are made by compacting the material of the plate to a depth which is less, than their radius, and the balls are pressed into the plate to a depth which exceeds their radius, and are embedded in the plate.