Question
Download Solution PDFWhich of the following instrument is NOT used to measure angles?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
There are several methods of measuring angles and tapers.
Angular measurement involves the measurement of angles of tapers and similar surfaces. Examples:
- Bevel protector
- Sine Bar
- Spirit level
- Clinometer
- Autocollimators
- Protector's head
Clinometer:
- It is an instrument for measuring angles of slope, elevation, or depression of an object with respect to the ground.
- A clinometer is a special case of a spirit level.
- While the spirit level is restricted to relatively small angles, clinometers can be used for much larger angles.
- These have an accuracy of one minute.
- Clinometers are used to determine the straightness and flatness of surfaces.
Bevel protector:
- Bevel protector is used for measuring the angles between two faces of components.
- It has a base plate or stock whose surface has a high degree of flatness and surface finish. The stock is placed on the workpiece whose angle is to be measured. It is normally used as a reference base for measuring angles.
- An adjustable blade attached to a circular dial is made to coincide with the angular surface. It can be swiveled to the required angle and can be locked.
- An optical flat is used in conjunction with a monochromatic light to measure the difference between two surfaces.
- A vertical beam of light of known wavelength is arranged to fall on the flat.
- An optical flat is a disk of high-quality glass or quartz. The surface of the disk is ground and lapped to a high degree of flatness.
- This is basically to measure very small deviations in the object in terms of the wavelength of light.
- The top surface and the bottom surface are completely made flat. And this is predominantly used for generating fringe patterns.
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