Zero Error in Screw Gauge: Formula and Checking Guide with Micrometer

Study Notes

Micrometer Screw Gauge

A micrometer screw gauge measures the diameter of an object with an accuracy of 0.01 mm.
The formula to calculate the reading is: 𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 = 𝑛𝑛 × 𝐿𝐿.𝐶𝐶.
Zero error must be checked before taking readings by closing the studs without placing anything in between.
If the zeros collide, there is no zero error, and no correction is required.

Types of Zero Error

Positive Zero Error: When the zero of the circular scale is lower than the zero of the main scale or index line, the error is positive.
Negative Zero Error: When the zero of the circular scale is above the zero of the main scale or index line, the error is negative.

Correcting Zero Error

To correct positive zero error, subtract the amount of zero error from the reading.
To correct negative zero error, add the amount of zero error to the reading.

Vernier Caliper

The formula to calculate the reading is: 𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 = 𝑀𝑀.𝑆𝑆.𝑅𝑅.+ 𝑛𝑛 × 𝐿𝐿.𝐶𝐶.
Zero error must be checked before taking readings by closing the jaws without placing anything in between.
If the zeros collide, there is no zero error, and no correction is required.

Converting Units

To convert a reading from centimeters to millimeters, multiply by 10. For example, a reading of 12.3 cm is equivalent to 123 mm.

Description

This quiz is about understanding the concept of zero error in a micrometer screw gauge, how to check for it, and how to apply corrections. It covers the basics of micrometer readings and measurements. Test your knowledge of this fundamental concept in physics and engineering.