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A screw gauge is a measuring tool composed of a calibrated screw that is used to measure the size of small objects.
- A screw gauge is a meteorological instrument that is commonly used in machining and mechanical engineering.
- Screw gauges are used to precisely measure thin wires and sheets.
It is divided into two scales: the Pitch Scale and the Circular Scale.
- Pitch scale: The main scale that measures the distance traveled by the spindle on each turn (in millimeters) is known as the pitch scale. The instrument's barrel has been shaped with vertical lines.
- Circular scale: The circular scale is horizontally engraved on the thimble. One revolution of the circular scale is equal to about half a millimeter of displacement of the screw.
The least count of a screw gauge is the distance traveled by the tip of the screw when a division of the head scale is rotated.
Least count of a screw gauge = Pitch / No. of divisions on a circular scale
Screw gauge
Ques. What is a screw gauge?
Ans. A screw gauge is a device used to precisely measure a cylindrical or spherical object.
Ques. What is the least count of a screw gauge?
Ans. The least count of micrometers is 0.01 mm.
Ques. What is the purpose of the ratchet in a screw gauge?
Ans. The purpose of the ratchet in a screw gauge is to prevent the spindle from moving further.
Ques. What are measuring tools?
Ans. They are tools used in the measurement of physical quantities of a body such as height, breadth, length, temperature, and so on.
Ques. What is the name of the C-shaped body that holds the anvil and barrel in a screw gauge?
Ans. The C-shaped body that holds the anvil and barrel in a screw gauge is known as the Frame.
Ques. Name the five types of screw gauges.
Ans. The five different types of screw gauges are
- Tube micrometers
- Universal micrometer sets
- Ball micrometers
- Blade micrometers
- Bench micrometers
Ques. What is the other name of the screw gauge?
Ans. A screw gauge, sometimes known as a micrometer, is a measuring device composed of a calibrated screw used to take the measurement of small objects.
Ques. What is the pitch of a screw?
Ans. The pitch of a screw is the distance between the two closest threads along the screw's axis.
Ques. Explain the zero error of screw gauges?
Ans. When connecting the two studs, if the zero point of the circular scale does not meet the zero point of the main scale, then the error that arises is known as zero error.
Ques. Does the screw diameter depend on the temperature?
Ans. Yes, the screw diameter is temperature dependent. When the temperature increases, the diameter of the screw increases.
Ques. When does the positive zero error occur?
Ans. A positive zero error occurs when the zero division on the scale appears above the reference line.
Ques. Which are the main stationary screw gauge parts?
Ans. The anvil, sleeve, spindle, thimble, and frame are the primary stationary screw gauge parts.
Ques. What is the purpose of a vernier caliper?
Ans. A Vernier caliper is a measurement instrument. It is used for measurement purposes when a component must be calculated to the second decimal place.
Ques. What is the minimum value that can be calculated using a micrometer and vernier caliper?
Ans. The smallest value that can be measured using a micrometer or vernier caliper scale is known as the least count.
It can be given by
Least Count = (Smallest division on the main scale) / (Total number of divisions on vernier or micrometer scale)
Ques. How many divisions are graduated on thimble?
Ans. Lines for graduation should be precisely etched. On the thimble are 50 graded divisions, each one measuring 0.01mm.
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