What is a machinist sine bar?

The sine bar or sine plate is used for accurately setting up work for machining or for inspection. Gage blocks are usually used for establishing the height. Rule for determining the height of the sine bar setting for a given angle: multiply the sine of the angle by the length of the sine bar.

Why is sine bar called so?

The sine bar is based on trigonometry. The distance between the two setting rollers of the Sine Bar is given by 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”.

How accurate are sine bars?

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.

What is used for making sine bars?

Sine bars are made from high chromium, high carbon, corrosion resistant steel, ground, hardened and stabilised.

How many types of sine bar are there?

The normal distance between the two rollers usually available in 100mm, 200mm or 300mm. There are two grades in sine bars. A grade, B grade. A grade sine bar is having the accuracy of 0.01mm/m length, B grade sine bar is having the accuracy of 0.02mm/m length.

Where is sine bar used?

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.

What is the limitations of sine bar?

Limitations of the Sine Bar: Any unknown projections present in the component will cause to induce errors in the angle measured. For the building of the slip gauges, there is no scientific approach available and it is to be built on the trial and error basis and it is a time-consuming process.

Where is a sine bar used?

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.

What is the difference between CMM and Umm?

1. What is the difference between CMM and UMM? Explanation: Co-ordinate measuring machine doesn’t inspect the geometric features of the part but universal measuring machine does it. Co-ordinate measuring machine is less accurate than a universal measuring machine.

What is sine bar in engineering?

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.

What is the difference between CMM and UMMY?

Which is not true for CMM?

Which of the following is not related to the geometrical accuracy of CMM? Explanation: Geometrical accuracy concerned with the straightness of axes, position accuracy and squareness of axes while total measuring accuracy concerns volumetric length measuring accuracy and axial length measuring accuracy. 9.