mcq: in a micrometer screw gauge, circular scale is marked on: thimble, ratchet, stud or sleeve?
Answers
Answer :
In a micrometer screw gauge, the circular scale is marked on the sleeve.
Explanation :
In a micrometer screw gauge, the circular scale is marked on the sleeve. The micrometer screw gauge is an instrument used to measure small distances or thicknesses with high accuracy. It consists of a spindle that rotates within a fixed outer casing (the sleeve) with a screw thread cut into its surface. The spindle is attached to a thimble, which is a cylindrical piece that is marked with a scale in millimeters or thousandths of an inch.
When the thimble is rotated, the screw thread causes the spindle to move along the axis of the sleeve, either towards or away from the object being measured. The circular scale marked on the sleeve is used to read the distance that the spindle has moved. By counting the number of full rotations of the thimble and the fractional rotation indicated by the position of a line on the circular scale, the total displacement of the spindle can be determined to a high degree of precision.
In conclusion, the circular scale in a micrometer screw gauge is marked on the sleeve and provides a means of measuring the distance that the spindle has moved with high accuracy.
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Answer:
A screw gauge is also known as a micrometer screw gauge. Let us know about the screw gauge measurement using a micrometer. A screw gauge is an instrument used to measure a cylindrical or spherical object precisely. A screw gauge is a mechanical tool mainly used for accurately calculating the radius or diameter of a wire or the thickness of a thin metal sheet. It is primarily used in the mechanical field for measuring very small dimensions. It is used for calculating the thickness of small sheets like glass or plastics and the diameter of thin wires.
The main parts of the screw gauge are:
Ratchet
Sleeve
Thimble
Main scale
Circular scale
Ratchet: It aids in moving the screw by turning it until the object is held between the stud and spindle of the screw.
Sleeve: It aids in marking the baseline and main scale
Thimble: Circular scale is marked using the thimble.
Main scale: It helps to read the length correctly up to 1mm.
Circular scale: It helps to read the length correctly up to 0.01mm.
Every rotation of the screw can correspond to an equivalent axial movement, known as the lead or pitch of the screw. When threads of the screw feature constant pitch, with known pitch value, the produced amount of axial movement can be traced on a scale easily. This is the principle used in measuring dimensions.
Steps to measure the reading:
Clean the spindle and anvil.
Place the object in between the spindle and anvil.
Rotate the ratchet counter-clockwise to tighten.
Tighten the spindle with the object in the midst.
Lock the thimble while the object is in between.
Take the object out cautiously.
Before you unlock the spindle, note the reading.
The distance moved by the spindle per revolution gives the pitch of the screw gauge. It is calculated by moving the head scale over the pitch scale. Pitch is given by the formula:
Pitch of the screw gauge = (distance moved by a screw)/(no. of rotations given)
The distance moved by the tip of the screw when turned through one division of the head scale is known as the least count of the screw. The least count is given by the formula:
Least count (LC) of the screw gauge = (pitch)/(total no. of divisions on the circular scale)
Least count of micrometer screw gauge = (1 mm)/(100) = 0.01 mm
Explanation:
A screw gauge is also known as a micrometer screw gauge. Let us know about the screw gauge measurement using a micrometer. A screw gauge is an instrument used to measure a cylindrical or spherical object precisely. A screw gauge is a mechanical tool mainly used for accurately calculating the radius or diameter of a wire or the thickness of a thin metal sheet. It is primarily used in the mechanical field for measuring very small dimensions. It is used for calculating the thickness of small sheets like glass or plastics and the diameter of thin wires.
The main parts of the screw gauge are:
Ratchet
Sleeve
Thimble
Main scale
Circular scale
Ratchet: It aids in moving the screw by turning it until the object is held between the stud and spindle of the screw.
Sleeve: It aids in marking the baseline and main scale
Thimble: Circular scale is marked using the thimble.
Main scale: It helps to read the length correctly up to 1mm.
Circular scale: It helps to read the length correctly up to 0.01mm.
Every rotation of the screw can correspond to an equivalent axial movement, known as the lead or pitch of the screw. When threads of the screw feature constant pitch, with known pitch value, the produced amount of axial movement can be traced on a scale easily. This is the principle used in measuring dimensions.
Steps to measure the reading:
Clean the spindle and anvil.
Place the object in between the spindle and anvil.
Rotate the ratchet counter-clockwise to tighten.
Tighten the spindle with the object in the midst.
Lock the thimble while the object is in between.
Take the object out cautiously.
Before you unlock the spindle, note the reading.
The distance moved by the spindle per revolution gives the pitch of the screw gauge. It is calculated by moving the head scale over the pitch scale. Pitch is given by the formula:
Pitch of the screw gauge = (distance moved by a screw)/(no. of rotations given)
The distance moved by the tip of the screw when turned through one division of the head scale is known as the least count of the screw. The least count is given by the formula:
Least count (LC) of the screw gauge = (pitch)/(total no. of divisions on the circular scale)
Least count of micrometer screw gauge = (1 mm)/(100) = 0.01 mm.
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