Personal Study Notes (Engineering Metrology - 22342)-with-numbers

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determine composite errors in vibrations, noise variations in action of gear.
- If a pair of gears works together at the designed speed and designed load with little
noise, the gears are considered to be satisfactory.
- If the drive is noisy, then analytical inspection is carried out to check individual
elements,
- The various functional tests are rolling gear test, Parkinson gear test etc.
Q. Explain measurement of Gear elements.
Q. Write short note on Run out Checking.

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Q. Write short note on Measurement of Pitch / Pitch Measuring Instrument / Pitch
checking Instrument.

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Q. Write short note on Measurement of lead and Backlash.

Q. Explain the method of gear tooth thickness measurement by Gear Tooth
Vernier Caliper with neat sketch.

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Q. Write short note on Parkinson’s gear Tester?

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Q. Explain construction, working, advantages and disadvantages of Parkinson’s
gear Tester?
Principle:-

Construction:-
Working:-

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Limitations:-

Advantages:-

Q. Write short on Composite Method of Gear Inspection?

Q. Explain rolling gear test.
1. Composite errors such as errors in tooth form, pitch, concentricity of pitch line etc.
can be checked by rolling gear test. This method is used to distinguish the gears
manufactured in two categories. (i) Acceptable, (ii) Rejectionable, before sending them
to assembly section.
2. The system consists of two carriages (one fixed and other movable) mounted on a
base.

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3. The fixed carriage is locked at one position. Master gear is mounted on the spindle of
fixed carriage.
4. The movable carriage is spring loaded and it is held towards the fixed carriage, with
the help of spring pressure.
5. Gear under test is mounted on the spindle of movable carriage, such that, master
gear and gear under test, both are in close mesh with each other. A dial gauge indicator
is made to rest against movable carriage.
6. Now, the master gear and gear under test, in mesh, are rotated by hand and dial
gauge readings are observed. If there are no variations observed in readings of dial
gauge indicator then the gear under test is to be perfect.
7. But if variations in dial gauge readings are found and variations fall outside the
permissible limits, then the gear is rejected.
8. Only acceptable gear are sent for assembly due to which unnecessary expenses in
assembly section can be saved.
Q. Explain constant cord method.

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Q. Explain any four types of errors in gears.
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Engineering Metrology (22342) Class – ME3I

Linear and Angular Measurement

Q. Write short note Linear Measurement & Its instruments.
Linear Measurement

Linear Measurement Instruments

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Q. Classify Measuring tools and instruments.

Q. Explain surface plates and V-Block.
Surface Plate

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V Blocck

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Q. Write short note on calipers.

Types
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Q. Explain combination set.

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Q. Explain depth gauge.

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Q. Expalin vernier caliper with construction and working.

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Q. Draw vernier caliper and explain function of each part.
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Q List the errors in vernier caliper

.

Q Write the precautions to be taken in use of vernier caliper.

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Q Explain the vernier height gauge and micrometer used in linear measurements.

Micrometer

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Types

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Q Explain the different instruments used in angular measurements.

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Bevel Protractor

Sine Bar
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Angle Gauges

Adding and Subtracting Angle Gauge Blocks

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Spirit Level

Clinometer

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Optical Instruments
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Autocollimator

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Angle Dekkor

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Q. Differentiate between angel gauges and slip gauges.
Q. Important question.

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Engineering Metrology (22342)
Other Measurements

Q. Explain Importance of Surface Finish in engineering applications.

Introduction Functioning of machine parts, load carrying capacity, tool life, fatigue life,
bearing corrosion, and wear qualities of any component of a machine have direct
bearing with its surface texture. Therefore, these effects made the control of surface
texture very important.

The root of any surface irregularity acts as sharp corner and such part fails earlier.

Thus in order to increase the life of any part which is subjected to repeated reversals
of stress, the working and non-working surfaces of that surface must be given very good
finish.

Good bearing properties in any part are obtained when the surface has large number
of irregularities, i.e. a large number of hills and valleys. The rate of wear is proportional
to the surface areas in contact and the load per unit area.

Thus it is seen that different requirements demand different types of surfaces.
Therefore, it became essential to measure the surface texture quantitatively and
methods were devised for this purpose.

The departure from a truly smooth surface may arise from a variety, of causes and
may be of several kinds. The texture or roughness {succession of minute irregularities}
on surface is influenced by the machining process employed.

Complete roughness is the resultant of irregularities of various kinds.

If the hills and valleys on a surface are very close, then surface appears as rough.
This is due to action of the cutting tool and is referred to as primary texture.

If the hills and valleys on a surface are far apart, it is due to imperfection in the
machine tool and is referred to as secondary texture or waviness.

This distinction between primary and secondary texture is due to difference in
wavelength.

A surface actually is quite complex and consists of many different wavelengths
caused due to feed of the tool, cutting action, vibrations, imperfections in machine tools,
etc.

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Q. Explain the Surface Metrology Concepts. Also explain Terminology. Term
Primary texture, Secondary texture, Sampling length, Lay.

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Q. Write short note on Analysis of Surface Traces.
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