Before using any sine bar for angular measurement work, for accuracy and precision, it is better to ensure whether the following accuracy requirements and tolerances as specified by I.S. 5359—1969 for 100 mm sine bar are met with :
Characteristics Permissible Tolerance
Flatness of upper and lower surfaces 0.001 mm
Parallelism of upper and lower surfaces w.r.t. datum
surface when resting on it 0.001 mm
Flatness of side faces 0.005 mm
Squareness of side faces to upper surface 0.003/25 mm
Parallelism of side faces to the axes of rollers 0.01/25 mm
Flatness of end faces 0.003 mm
Squareness of end faces to the upper surface 0.003/25 mm
Parallelism of end faces to the axes of the rollers 0.01/25 mm
Straightness of individual rollers and freedom from lobing and uniformity in diameter 0.002 mm
Mean diameter of rollers 0.002 mm
Distance between the roller axes ± 0.003 mm