engineering metrology lab manual

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CALIBRATION OF DIAL GAUGE AIM: To calculate the dial gauge. APPARATUS REQUIERD: Surface plate Slip gauge set Cotton Oil Dial gauge indicator. PROCEDURE: The corresponding slip gauge is taken and it is placed on the surface of the table. Dial gauge indicator is placed on the surface of the table. Dial gauge is set zero position. Now the dial gauge tip is placed over the slip gauge. The reading are noted and tabulated using dial gauge indicator. GRAPH: The graph is plotted between nominal value(X- axis) and actual value(Y-axis) Nominal value vs Actual value

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Page 1: Engineering Metrology Lab Manual

CALIBRATION OF DIAL GAUGE

AIM:

To calculate the dial gauge.

APPARATUS REQUIERD:

Surface plate Slip gauge set Cotton Oil Dial gauge indicator.

PROCEDURE:

The corresponding slip gauge is taken and it is placed on the surface of the table. Dial gauge indicator is placed on the surface of the table. Dial gauge is set zero position. Now the dial gauge tip is placed over the slip gauge. The reading are noted and tabulated using dial gauge indicator.

GRAPH:

The graph is plotted between nominal value(X-axis) and actual value(Y-axis) Nominal value vs Actual value

RESULT:

The calibration of dial gauge indicator was done with the slip gauge.

Page 2: Engineering Metrology Lab Manual

TABULATON:

S.no Nominal value (mm) Main scale reading (mm)

Dial gauge reading (mm)

Total reading(mm)

Page 3: Engineering Metrology Lab Manual

MEASURING ANGLE AND TAPER USING SINE BAR

AIM: To find the angle of a taper using sine bar.

APPARATUS REQUIERD: Sine bar Steel rule Slip gauge

MATERIAL REQUIRED:

Taper component Cloth for cleaning

FORMULA: θ=sin-¹ (h/L) (degree) where h= Height of slip gauge(mm) L=Distance between roller center length (mm)

PROCEDURE:

The tapered component is placed on the surface plate. The sine bar is decently aligned on the work piece along with tapered force and care should be taken that there should not be any air gap between the sine bar surface of tapered force of the work piece. Note down height of slip gauge and length of two center of rollers. Now slip gauge are taken and they are built as blocks vertically to the plugs of the sine bar from the surface plate. The slip gauge are removed or added as necessary until the sine bar surface of the work piece. The value θ is calculated by measuring (h1-h2).:d ; using the formula.

RESULT:

The angle of taper of the given work piece was calculated using the sine bar and

slip gauge.

Page 4: Engineering Metrology Lab Manual

TABULATION:S.no Height of slip gauge(h) mm Distance b/w roller center

length (mm)θ=sin¹(h/L)

Page 5: Engineering Metrology Lab Manual

CALIBRATION OF MIICROMETER

AIM: TO calibrate the given micrometer using the standard slip gauge.APPARATUS REQUIRED:

Slip gauge Micrometer Anvil

PROCEDURE: Check the micrometer for smooth running over its hole

range. Clear the anvil carefully. Set and clamp the micrometer horizontally in the stand. Close the anvil and note the zero error. Also note the

leastcound. Determine the progressive error of the micrometer by

choosing standard slip gauge for the whole range. Plot the graph between nominal value VS progressive

error.GRAPH: Nominal value (y-axis) VS progressive value ( x-axis)OBSERVATION: 0.5 mm = 50div Least count = .5/50 L.C = .01mm

RESULT: The given micrometer is calibrated by using the standard instrument slip gauge.

Page 6: Engineering Metrology Lab Manual

TABULATION:s.no Nominal

Value(mm)

ZeroError(c)mm

Micrometerreading

M.R=B.R+(T.r*L.C)

Total reading=M.R+_zeroerror

PitchscaleReading(mm)

ThimblescaleReading(mm)

Page 7: Engineering Metrology Lab Manual

CALIBRATION OF MIICROMETER

AIM: TO calibrate the given micrometer using the standard slip gauge.APPARATUS REQUIRED:

Slip gauge Micrometer Anvil

PROCEDURE: Check the micrometer for smooth running over its hole

range. Clear the anvil carefully. Set and clamp the micrometer horizontally in the stand. Close the anvil and note the zero error. Also note the

leastcound. Determine the progressive error of the micrometer by

choosing standard slip gauge for the whole range. Plot the graph between nominal value VS progressive

error.GRAPH: Nominal value (y-axis) VS progressive value ( x-axis)OBSERVATION: 0.5 mm = 50div Least count = .5/50 L.C = .01mm

RESULT: The given micrometer is calibrated by using the standard instrument slip gauge. TABULATION:

Page 8: Engineering Metrology Lab Manual

s.no NominalValue(mm)

ZeroError(c)mm

Micrometerreading

M.R=B.R+(T.r*L.C)

Total reading=M.R+_zeroerror

PitchscaleReading(mm)

ThimblescaleReading(mm)

CALIBRATION OF VERNIER CALIPER

Page 9: Engineering Metrology Lab Manual

AIM: To calibrate the vernier caliper

APPARATUS REQUIRED: Vernier caliper Slip gauge ( 83Nos.)

PROCEDURE Check the vernier caliper for zero error. Note down the whether

error is positive or negative. If the error is positive then we have to subtract it from the final reading. If the error is negative then we have to add to the final reading.

To take a standard slip gauge place place it between the fixed and movable jaw on the vernier caliper and note the corresponding main scale division and also consider the zero error

Tabulate the readings as showv in the table and calculate the total vernier reading.

Report the above steps for different slip gauge of various size and tabulate the error .

A graph is ploptted between nominal value and obtained value.GRAPH

Nominal reading (y-axis)VS actual reating (x-axis)

OSERVATION

1 mm = 50 div Leastcount = (1/50) L.C = 0.02 mm

RESULT: The given vernier caliper is calibrated to comparing it with a standard instrument the slip gauge

TABULATION:

Page 10: Engineering Metrology Lab Manual

S.NO NominalValue(mm)

ZeroError(c) (mm)

Verier reading Total reading TR=VR+C (mm)Main

Scale(mm)

VernierScale(mm)

V.R=M.S.R+(V.S.R *L.C)(mm)

1

2 3 4 5

Model calculation:

V.R=M.S.R ± (V.S.R x L.C)

TR = VR ± C

CHECKING DIMENSIONS OF PART USING SLIP GAUGE

Page 11: Engineering Metrology Lab Manual

AIM: To check the dimension of part using slip gauge.APPARATUS REQUIRED:

Surface plate Slip gauge set Work piece Cotton Oil

Dial gauge indicator.PROCETURE:

The corresponding work piece is taken and placed on the surface of table.

The slip gauges are lined by wringing process and added over the other until we reach the approximate dimensions of the workpiece.

The surface of the work piece is and it added on slip gauges are compared manually by using the dial gauge indicator. The adding process is continued until both surface of the work piece and slip gauges are in same level.

Similarly different dimensions are measured.

RESULT: The required dimensions of the work piece is measure d by the adding the values of the slip gauges that were used in the experimend.

TABULATION:

Page 12: Engineering Metrology Lab Manual

BLOCK Workpiece dimension(mm)

Total Distanceobtained by slip gauge (mm)

TEMPERATURE MEASUREMENT AND COOLING SYSTEM

AIM

Page 13: Engineering Metrology Lab Manual

To measure the temperature of given liquid and to calculate it with RTD and thermo couple

APPARATUS REQUIRED:

1.Water bath2.Thermo start3.RTD Sensor4.Thermo couple and power supply

PROCEDURE:

1.Using thermostat couple controlled temperature source select any temperature of water2.Dip thermomerer and RTD sensor in water3.Note the temperature output and RTD output in mirovoltTerminal the ohm terminal4.For taking the digital output reading switch on the instrument5.select the toggle switch either thermocouple or RTD made and get respective output

GRAPH:

1. Temperature 2. temperature VS Resistance

RESULT: The temperature of the given liquid is measured and calibrated with RTD and thermocouple.

TABULATION

Page 14: Engineering Metrology Lab Manual

Sno. Thermometer reading in degree

Thermocouple output in mv

RTD O/P IN ohm

Page 15: Engineering Metrology Lab Manual

VIBRATION MEASUREMENT

AIM

To study the vibration measurement techniques using given vibration measurement device and also to observe behaviour of result.

Apparatus required

1.vibration generator2.Electronic display unit 3.Accelerometer

Procedure:

1. Switch on the set up after giving if proper connection with power supply2. keep frequency in the display unit at constant3. Increasing voltage and take the resulting displacement velocity acceleration

reaching4. With the obtained reading plot a graph with voltage in X axis is and displacement5. Studu behaviour of those two charactrestics

RESULT:

Thus the vibration measurement technique using given measurement device has been determined.

Page 16: Engineering Metrology Lab Manual

TABULATION 1

Constant voltage

READING FROM DISPLAY UNITD V A HZ

TABULATION 2:

Constant voltage

READING FROM DISPLAY UNITD V A HZ

Page 17: Engineering Metrology Lab Manual

LINEAR VARIABLE DIFFERENTIAL TRANSFORMER WITH CLAIBRATION TEST RIG

AIM: To calibrate the LVDT

APPARATUS REQUIRED:

LVDT kit Micrometer

THEORY:

MEASUREMENT OF DISPLACEMENT: Differential transformer based on a variable inductance principle are also used to measure displacement. The most popular variable inductance transducer for linear displacement measurement for the linear variable differential transformer (LVDT). The LVDT illustrated consist of three symmetrically spaced coils wound into on insulated bobbin. A magnetic cores which moves through the bobbin with out contact provides a path for magnetic flux linkage between coils the position of the magnetic core controls the mutual between the center or priming coil and with the tow outside or secondary coils.

PROCEDURE: Connect the power supply chord at the rear panel to the 230V, 50HZ

supply. Switch on the instrument by pressing down the toggle switch. The display glows to indicates the instrument is ON.

Allow the instrument is ON position for 10 min for intial warmup. Rotate the micrometer till it reads“20.0” adjust the cal potentiometer

at the front panel so that display reads “10.0” and adjust the zero potentiometer till the display used “0.00”.

Rotate back the micrometer core upto “20.0” and adjust once again cal potentiometer till the display read 10.0.Now the instrument is calibrated for +/-10mm range. As the core of LVDT moves the display reads the displacement in mm.

RESULT: Thus the LVDT trainer kit by compailing displacement was calibrated.

Page 18: Engineering Metrology Lab Manual

TABULATION:

S.no Actual micrometer reading(mm) (B)

Indicater reading LVDT.(C) (mm)

Error(B-C)

123456

Page 19: Engineering Metrology Lab Manual

MEASUREMENT OF THREAD PARAMETERS USING3-WIRE METHOD

AIM: To determine the effective diameter of thread by three wire method.

APPARATUS REQUIRED:

Floating carriage micrometer Standard gauge Screw thread Three wire

PROCEDURE:

The effective diameter of a screw thread may be as certained by placing three wire on rods of identical diameter is placed between flank and thread

Measure the distance over the outside of wire. Then the micrometer readings are taken and the effective diameter is calculated

by using the formula

FORMULA:

M = E+d (1+cosec (α/2) p/ (cos(α/2))X = 63 (metric thread)P = 2mm (piston)Wire dia = 1.35 mm

RESULT:

Thus the effective diameter of thread by using three wire method using floating by using three wire method using floating carriage micrometer was determined

Page 20: Engineering Metrology Lab Manual

TABULATIO N

MASTER GAUGE READING

S.NO Main scale reading (mm)

Vernier to scale reading (mm)

Vernier to vernier reading (mm)

Micrometer reading (mm)

MASTER GAUGE READING WITH THREE WIRE METHOD

S.NO Main scale reading (mm)

Vernier to scale reading (mm)

Vernier to vernier reading (mm)

Micrometer reading (mm)

MEASUREMENT OF GEAR TOOTH THICKNESS USING GEAR TOOTH VERNIER

Page 21: Engineering Metrology Lab Manual

AIM: To determine the thickness of gear tooth using gear tooth vernier

APPARATUS REQUIRED:

Gear tooth vernier Gear Surface plate Outside caliper

FORMULA:

Blank diameter D1=(N+2)/P(mm)N=number of teeth

Pitch (P) = (N+2)/D1 (mm) Pitch circle diameter D = N/P (mm) Module m = (D/N) Height at which the thickness of the gear has to the measured Theoretical formula for thickness of the gear W = Nm sin

(90/N) (mm)H = Nm (1+(2/N)-cos (90/N) (mm)

PROCEDURE:

The surface plate is cleaned and the given gear is placed on the surfaceplate

The blank diameter (D1) of the gear is measured using the outside vernier caliper

The pitch of gear is formed by using formula (2) and (3) The pitch circle diameter the formula is found by using formula (4) The depth (h) is set in vertical scale and the thickness measured from the

horizontal scale Different set of readings are taken by placing the gear tooth vernier on the

different teeth and the average is taken.This value is compared with the theoretical value

RESULT :

Thus the thickness of the gear was measured using gear tooth vernier

TABULATION

BLANK DIAMETER:

Page 22: Engineering Metrology Lab Manual

L.C = 0.02mm

SNO. Main scale reading (mm)

Vernier scale reading (mm)

Correct reading = MSR ± (VSR*LC)(mm)

GEAR TOOTH VERNIER L.C = 0.02mmSNO. Main scale reading

(mm)Vernier scale reading (Div)

Correct reading CR=(MSR+VSR*LC)(mm)

MEASUREMENT OF THREAD PARAMETER

Page 23: Engineering Metrology Lab Manual

AIM: TO determine the major diameter and minor diameter of thread using floating carriage micrometer

APPARATUS REQUIRED:

Floating carriage micrometer Standard gauge Screw thread Cutting edged prism Work piece

PROCEDURE:

The dia of cylinder must be nearly same as the major dia. The cylinder is held and reading of the micrometer is noted down

Then replaced by thread is work piece again micrometer readings is noted. For the same reading fudicial indicator

Thus the size of cylinder is approaching throat of major dia then for a given reading the micrometer thread is used over a short length of travel and pitch error. It certain are vitually eliminated

MEASUREMENT OF MINOR DIAMETER:

Measurement of minor dia ate measured using knife edge which makes contact with root of the thread

The knife edge are available in several sizes having suitable radii at the edges The included angle of edge is less than the angle of the thread to be checked so

that it can easily prove to the root of the thread.

RESULT: Thus the major and minor diameter of thread using floating carriage micrometer can be determined

TABULATION:

Page 24: Engineering Metrology Lab Manual

S.NO Diameter of setting cylinder(mm)

Reading of micrometer an setting of cylinder (R1)(mm)

Micrometer reading in thread (R2)(mm)

Totoal major dia D1-(R1-R2)(mm)

S.NO Diameter of setting cylinder(mm)

Reading of micrometer an setting of cylinder (R1)(mm)

Micrometer reading in thread (R2)(mm)

Totoal minor dia D1-((R1-R2)*2)(mm)