Bevel Protractor Definition | Parts | Working, application, Uses |

what is bevel protractor ?

A bevel protractor is a precision measuring instrument used for measuring and marking angles. It consists of a circular protractor dial with a graduated scale ranging from 0 to 360 degrees. The dial is attached to a base plate that can be swiveled and locked at any desired angle.

The bevel protractor is primarily used in engineering, metalworking, and woodworking applications. It is commonly employed for tasks such as setting and measuring angles for machining operations, layout work, inspection, and quality control.

To use a bevel-protractor, the base plate is positioned on the surface to be measured, and the dial is rotated to align with the reference angle. The locking mechanism is then engaged to secure the protractor in place, allowing for accurate angle measurements.

Some bevel-protractors also feature a vernier scale, which provides additional precision by allowing readings to be taken to a fraction of a degree.

Overall, It is a versatile tool that enables accurate angle measurements and helps ensure precise and consistent results in various industries.

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parts of bevel protractor

It consists of several parts that work together to accurately measure angles. Here are the key components of a bevel protractor based on the information provided in the article:

working of bevel protractor

Firstly, the workpiece, whose angles are to be determined, is positioned between the blade and the stock of the bevel protractor. One side of the surface, which measures the angle, is placed in direct contact with the blade, while the other sides make contact with the stock.

Once the workpiece is properly aligned with the blade and the blade is correctly positioned on the workpiece, it is secured by tightening the blade locking screw. Subsequently, when the measured surface fully aligns with the stock and blade, the angle is fixed by tightening the angle locking screws.

Now, let’s observe the values on the main scales that align with the zero point on the Vernier scale. The value we read from the main scale provides the angle in degrees. More precisely, the angle on the main scale appears just before the zero points on the Vernier scale.

To achieve a more accurate measurement of the angle, we will now determine the remaining angle in minutes. To accomplish this, we examine the Vernier scale and locate the line that perfectly aligns with the line on the main scale.

Once we have identified that line, we note its position on the Vernier scale. The measurement in minutes for the angle is calculated by multiplying the position of the corresponding line on the Vernier scale by five.

Finally, we record the measured angle in degrees and minutes, using the bevel protractor. In this manner, we are able to obtain a highly precise measurement of the angle using a bevel protractor.

how to use bevel protractor step by step

The working of a bevel protractor involves a simple and straightforward process. Here are the steps involved:

It’s important to handle the bevel protractor with care, ensuring that it is positioned correctly and that the blade or arm is aligned accurately. Any misalignment or errors in reading or locking the angle can affect the measurement accuracy. Regular calibration and maintenance of the bevel protractor can help maintain its accuracy over time.

vernier bevel protractor least count

The least count of a Vernier bevel protractor refers to the smallest angle that can be accurately measured using the instrument. It represents the degree of precision or resolution of the protractor’s measuring scale.

In the case of a Vernier bevel protractor, the least count is determined by the division on the Vernier scale that aligns with a division on the main scale or dial scale. The Vernier scale typically has divisions that are smaller than those on the main scale, allowing for more precise angle measurements.

To calculate the least count of a Vernier bevel protractor, you need to consider the division size on both the Vernier scale and the main scale. Let’s assume that on the Vernier scale, each division represents 5 minutes (1/12th of a degree), and on the main scale, each division represents 1 degree.

To find the least count, you divide the smallest division on the main scale by the total number of divisions on the Vernier scale. In this case, since the Vernier scale has 12 divisions, the least count would be:

Least Count = Smallest Division on Main Scale / Total Divisions on Vernier Scale
= 1 degree / 12 divisions
= 1/12 degree or 5 minutes

Therefore, the least count of this particular Vernier bevel protractor would be 1/12th of a degree or 5 minutes. This means that the instrument can measure angles with a precision of 5 minutes, allowing for more accurate angle measurements compared to a protractor without a Vernier scale.

How to read bevel protractor by example

Sure! Here’s a simplified version:

In the figure, we can see that the main scale aligns with the 0 line on the vernier scale, and it shows 80 degrees.


Main Scale Reading = 80 degrees

Now, if we look closely, we can see that the 7th line on the vernier scale matches with a line on the main scale.

Each line on the vernier scale represents 5 minutes.


Vernier Scale Reading = 7 lines × 5 minutes = 35 minutes

To get the final reading, we add both values together.

Vernier Bevel-Protractor Reading = 80 degrees + 35 minutes

Vernier Bevel-Protractor Reading = 80 degrees + (35/60) degrees

Vernier Bevel-Protractor Reading = 80.58 degrees

To take care of the Vernier bevel-protractor:

In summary, we discussed the parts of a vernier bevel protractor, how to calculate its least count, and how to read the measurements. We also covered some care and maintenance tips.

I hope you found this topic enjoyable and informative!

bevel protractor is used for

A bevel protractor is primarily used for measuring and setting angles accurately. It is commonly used in various industries, including metalworking, woodworking, engineering, and construction.

Overall, It is a versatile tool that enables accurate angle measurement and facilitates various tasks that require precise angular positioning or alignment.

applications of bevel protractor

Bevel protractors find applications in various industries and fields. Some common applications of bevel protractors include:

These are just a few examples of the applications of bevel protractors. Their versatility, accuracy, and ease of use make them essential tools in many industries that require precise angle measurements and markings.

advantages of bevel protractor

Bevel protractors offer several advantages that make them valuable tools for various applications. Here are some of the advantages of using a bevel protractor:

Overall, the advantages of bevel protractors include their accuracy, versatility, ease of use, portability, durability, and educational value. These factors contribute to their widespread use in various industries and their effectiveness in achieving precise angle measurements.

disadvantages of bevel protractor

While bevel protractors offer several advantages, there are also some limitations or disadvantages associated with their use. Here are a few disadvantages of bevel protractors:

It’s important to consider these limitations and factors specific to bevel protractors when choosing the appropriate measuring tool for a particular task or application. In some cases, alternative measuring instruments may be more suitable for achieving specific requirements or higher levels of precision.

Source : Wikipedia

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