sine bar | why Sine bar is not preferred for angles greater than 45 degree? | How to use sine bar

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In this video easy explanation about why sine bar is not preferred to measure angle greater than 45 degree.
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 of the bar is parallel to a line through the centers of the two rollers. ... The angle is calculated by using the sine rule.
A sine bar is used either to measure an angle very accurately or face locate any work to a given angle. Sine bars are made from a high chromium corrosion resistant steel, and is hardened, precision ground, and stabilized. Two cylinders of equal diameter are placed at the ends of the bar.
Construction of Sine Bar
The sine bar is made of high carbon steel, high chromium (corrosion resistance) and hardened. It consists of two rollers with steel bars. The two rollers are very precise and highly accurate and are equal in diameter.
When the sine bar placed on a flat surface, the axes of the two rollers are parallel to each other and also parallel to the above face of the sine bar. The steel bar has the appearance of relief holes. (To easily handle the sine bar and also to reduce overall weight.
The distance between two rollers is usually available in 100 mm, 200 mm or 300 mm. There are two grades in the sine bar. A grade and B grade. A grade sine bar has an accuracy of 0.01mm /m length, B grade sine bar has an accuracy of 0.02mm /m length.
The one roller is placed on a surface plate and the other is placed at height h by a slip gauge. The distance between the two setting rollers of the Sine Bar is given by L.
The above trigonometric formula Sine above = opposite/diagonal = h / L
From this we can write θ = sin^-1 (h / L).
This is the formula for sine bar for calculating the angle or setting the workpiece to the required angle. This device is called “Sine Bar”.
Following are the applications of sine bar:
The sine-bar is used to set or determine the workpiece at a given angle.
For checking the measurement of unknown angles in the workpiece.
Some specially designed sine bars are used to mount the workpiece to perform conical-shaped machining for the workpiece.
To check for unknown angles on heavy components.
For checking the angles of taper key.
To check the flatness of the surface.
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[@athuldas44]

thank you sir

[@modimechanicalengineeringt8780]

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[@drugbaba]

What about less than 15 degree ? Explain with reasons

[@mysecondclass4405]

Very nice

[@modimechanicalengineeringt8780]

Thanks for appreciation
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[@lokeshpatel9350]

thank you sir for this

[@modimechanicalengineeringt8780]

Thanks dear

[@atharvnigudkar8223]

Aatechi ga