Why it is not preferred to use the sine bar for the angle measurement above 450?

The effect of error in spacing of roller centres (dL) or errors in combination of slip gauges (dh) on angular setting accuracy can be obtained by partial differentiation of the above equation. Hence it is not preferred to use sine bar for measuring angles greater than 45°.

What is limitation of sine bar?

Following are the limitations of sine bar: Any unknown projections present in the component will cause errors in the measured angle to be induced. For the construction of slip gauges, there is no scientific approach available and it has to be built on trial and error basis and it is a time-consuming process.

In which case sine bar is not used?

Which of the following is incorrect regarding sine bars? Explanation: The sine bar is itself not a complete instrument or complete measuring instrument. Another datum like surface plates are needed. Some holes are drilled in the bar body.

What is the accuracy of a sine bar?

Accuracy up to 0.01mm/m of length of the sine bar can be obtained. A sine bar is generally used with slip gauge blocks. The sine bar forms the hypotenuse of a right triangle, while the slip gauge blocks form the opposite side.

How sine bar is used for angle measurement?

Angles are measured using a sine bar with the help of gauge blocks and a dial gauge or a spirit level. The aim of a measurement is to measure the surface on which the dial gauge or spirit level is placed horizontally. At this position, the top surface of the sine bar is inclined the same amount as the wedge.

What are the purpose of using sine bar?

A sine bar is used in conjunction with slip gauge blocks for precise angular measurement. A sine bar is used either to measure an angle very accurately or face locate any work to a given angle offering a high degree of accuracy in measuring angles for milling, grinding and inspection applications.

Why sine bar is used?

Why sine bar are used?

What is sine bar and why it is used?

The sine bar is an exact angle measuring instrument. It is used to measures angles very accurately or to align the workpiece at a given angle. The sine bar is the most accurate tool for measuring angles. The sine bar is made of high carbon, high chromium corrosion resistance steel.

Can we use angle gauge with sine bar to measure angle?

Only a sine bar cannot be used for the measurement of angles of a component alone. The sine bar is always used for the measurement of angles with slip gauges and elevation gauges. Surface Plate: A surface plate is used as a base for arranging the sine bar and other components such as slip gauges and height gauges.

What is principle of sine bar?

Working Principle of Sine Bar: The principle of operation of the sine bar is based on the law of trigonometry. If one roller of sine bar is placed on the surface plate and the other roller is placed on the height of slip gauges, then the structure formed by the sine bar, surface plate, and slip gauges forms a triangle.

What are the different uses of sine bar and angle gauges why the sine bar is not preferred for measuring the angle larger than 45?

Now sec θ increases very rapidly for an angle greater than 45°. Therefore, it is not recommended to use sine bars for angles greater than 45° because any error in the sine bar or height of slip gauges gets accentuated.

How accurate is the angle set by a sine bar?

The accuracy of the angle set by a sine bar depends on the the errors in its important dimensions such as error in distance between roller centres, error in combination of the slip gauges used for setting, error in parallelism between gauging surface and plane of roller axes etc.

When to use a sine bar instead of a height gauge?

If the length of the inspected component is too long, there is no sine bar available that is longer than the component. In these cases, the sine bar will be used together with the height gauge for measurement. The sine-bar is used to set or determine the workpiece at a given angle.

What is the use of sine bar in machining?

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.

What is the accuracy of the sine principle?

The accuracy with which the sine principle can be put to use is dependent in practice, on some from linear measurement. The sine bar itself is not complete measuring instrument. The sine principle uses the ratio of the length of two sides of a right triangle in deriving a given angle.