Explain different types of dial indicators and their applications.
The correct answer and explanation is:
Correct Answer:
Dial indicators are precision instruments used to measure small linear distances or displacements. Different types include plunger-type (standard), lever-type (test indicators), and digital dial indicators. Their applications span across alignment, runout measurement, and flatness inspection.
300-Word Explanation:
Dial indicators are widely used in mechanical and manufacturing fields for measuring small deflections or deviations in a part or setup. These instruments amplify small movements of a spindle or lever into readable values on a dial face or digital screen.
One of the main types is the plunger-type dial indicator, also called the standard dial indicator. It features a spring-loaded spindle that moves in and out of the body. This type is commonly used to measure parallelism, flatness, and shaft runout. It is often mounted on a stand and placed against a surface to detect variations as the part moves or rotates.
Another type is the lever-type dial indicator, also known as a test indicator. Instead of a plunger, it uses a small lever or arm that pivots. This design allows for easier measurement of surfaces that are not parallel to the indicator’s axis. It is ideal for checking alignment, tool setups, or surface profiles, especially in tighter spaces.
Digital dial indicators are modern versions of the traditional dial indicator. They display readings on an electronic screen, often with metric and inch conversion and zeroing options. These are beneficial where high accuracy and easier readability are required. They are used in CNC machine setups, calibration labs, and quality control inspections.
Each type is selected based on the specific requirement of the task. Whether measuring the accuracy of a machine tool or inspecting a manufactured part for tolerance, dial indicators provide reliable and precise results. Regular calibration and proper usage ensure their accuracy and longevity in industrial applications.