Working Principle
A screw gauge uses the precise motion of a calibrated screw and interactions between the main scale and a circular scale to work. Here’s a step-by-step explanation of the working principle:
Structure of Screw Gauge
- A screw gauge comprises a frame in the shape “U” that contains fixed end-flat anvil and moveable end-pointed spindle.
- It has a fine-threaded screw in the spindle.
Rotation of Screw
- Turning of the circular head or thimble rotates the screw, thereby causing movement of the spindle toward or away from a stationary anvil.
Measurement Principle
- The pitch is defined as the distance advanced by the screw when it undergoes one full turn of rotation.
- The screw’s movement transfers over onto the spindle and therefore causes its axial motion.
Interaction with Scales
- The main scale, which can be found on the frame, represents a linear scale that has been designed for measuring the total turns of the screw.
- A circular scale is used for measuring the fractions of rotation with a circular head or thimble.
Reading Measurement
- To measure an object, one turns the screw until it becomes the tight position with which it will be clamped in between the anvil and then spindle.
- The main scale reading shows the number of full turns, while the circular scale reading provides the fraction.
Calculating Measured Value
- The measured value is determined as a combination of the main scale reading, and multiplication of least count and the quantity of circular scale divisions.
Screw Gauge: Definition, Working Principle, Formula
Screw Gauge is an amazing device used for measuring small objects precisely. It is defined as an instrument that is used for measuring very small lengths, i.e. diameter of thin wires, the thickness of small sheets, papers, etc.
In this article, we will learn about Screw Gauge, Its structure, Diagram, Working Principle, errors in screw gauge, its applications, and others in detail.
Table of Content
- What is Screw Gauge?
- Screw Gauge Formula
- Screw Gauge Diagram
- Working Principle
- Errors in Screw Gauge
- Uses of Screw Gauge