handling. Sine centre A special type of sine bar is sine center which is used for conical objects having male and female parts. It cannot measure the angle more than 60 degrees. Sine table A sine table (or sine plate) is a large and wide sine bar, typically equipped with a mechanism for locking it in place after positioning, which is used to hold workpieces during operations. Compound sine table It is used to measure compound angles of large workpiece. In this case, two sine tables are mounted one over the other at right angles. The tables can be twisted to get the required alignment. References Metalworking measuring instruments