Sine bar
Videos
A sine bar consists of a hardened, precision ground body with two precision ground cylinders fixed at the ends. The distance between the centers of the cylinders is precisely controlled, and the top o
Sine bar set up with one end raised on a stack of gauge blocks
254 mm (10") and 100 (3.93") sine bars. In the U.S., 127 mm (5") sine bars are the most common size.
Lapping
Videos
Lapping is a machining process in which two surfaces are rubbed together with an abrasive between them, by hand movement or using a machine.
Sine bar
…the wedge is the ratio of the height of the gauge blocks used and the distance between the centers of the cylinders. The simplest type consists of a lapped steel bar, at each end of which is attached an accurate cylinder, the axes of the cylinders being mutually parallel and parallel to the upper surface…
Small lapping plate made of cast iron
Small lapping machine
Logitech lapping machine and retention jig
Optical flats in a wooden case