Make a sketch of outside micrometer and name the parts on the instrument.
The correct answer and explanation is :
Here is a technical sketch of an outside micrometer with labeled parts.
Explanation (300 Words)
An outside micrometer is a precision measuring instrument used to measure external dimensions such as the thickness of objects or the diameter of cylindrical parts. It operates on the principle of a precision screw mechanism.
Main Parts of an Outside Micrometer:
- Frame – The C-shaped structure that provides support and stability.
- Anvil – A fixed measuring surface against which the object rests.
- Spindle – A movable measuring surface that moves towards or away from the anvil.
- Sleeve (Main Scale) – A stationary cylindrical part with a graduated scale for reading measurements.
- Thimble (Rotating Scale) – A rotating part marked with a secondary scale, allowing precise measurement.
- Ratchet Stop – Ensures uniform pressure for accurate readings.
- Lock Nut – Locks the spindle in place to hold a measurement.
How it Works:
To use an outside micrometer, the object is placed between the anvil and spindle. The thimble is rotated, moving the spindle toward the object. The ratchet stop ensures consistent pressure. The reading is taken from the sleeve and thimble scales.
Micrometers provide high accuracy, usually up to 0.01mm or 0.001 inches, making them essential in engineering and machining for quality control.