Sine
bars are always used along with slip gauges
Sine
bars are used to
1) Measure
angles very accurately.
2) Locate
the work piece to a given angle with very high precision.
- Generally, sine bars are made from high carbon, high chromium, and corrosion resistant steel.
- These materials are highly hardened, ground and stabilized.
- In sine bars, two cylinders of equal diameter are attached at lie ends with its axes are mutually parallel to each other.
- They are also at equal distance from the upper surface of the sine bar.
- Mostly the distance between the axis of two cylinders is 100mm, 200mm or 300mm.
- Cylindrical holes are provided to reduce the weight of the sine bar.
Working of sine bar
The
working of sine bar is based on trigonometry principle.
To measure the angle of a given
specimen, one roller of the sine bar is placed on the surface plate and another
one roller is placed over the surface of slip gauges.
Now, “h” be the height of slip
gauges and “L” be length of sine bar centers, then the angle is calculated
using the formula
