45884805 metrology lab manual dimension

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Metrology Lab Manual

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  • Metrology lab manual.

    Ravi.K, Dept. of I&P Engg., PESCE, Mandya, Karnataka

    1

    Metrology Laboratory

    Subject code: Duration of Exam: 3Hours

    1. Calibration of micrometer using slip gauge or height master.

    2. Calibration of Vernier caliper using slip gauge or height master.

    3. Calibration of height gauge using slip gauge or height master.

    4. Calibration of straight edge by Wedge method.

    5. Measurement of dovetail angle and checking the taper angle of taper plug.

    6. Angle measurement using Combination sets, Universal bevel protector, Optical bevel protector,

    Sine bar and Since Center.

    7. Screw thread measurement using Two wire method, three wire method, Pitch gauge and Profile

    projector.

    8. Auto Collimator

    9. Gear tooth measurement using Gear tooth Vernier Caliper, Constant chord method

    10. Calibration of Height gauge

    11. Profile Projector andTool Maker Microscope

    12. Study and measurement of surface finish by surface finish tester,

    13. Roundness or Circularity testing.

  • Metrology lab manual.

    Ravi.K, Dept. of I&P Engg., PESCE, Mandya, Karnataka

    2

    Expt. No 01

    CALIBRATION OF MICROMETER

    Theory:

    Write brief theory about slip gauges; classification, specification, uses and care to be taken before and

    after using.

    A micrometer is used to measure the external diameter of small cylinders, sphere etc.

    It has a V shaped structure to which a handle is attached. Two anvils are fixed to the inner

    surface of the block. The job to be measured is placed between the anvils and held in position by

    rotating the handle. The end of the screw forms one measuring tip and the other measuring tip is

    constituted by a stationary anvil in the base of the frame. The screw is threaded for certain distance and

    plain for the remaining distance. The screws plain portion is called sleeve and its end is the

    measuring surface.

    Procedure:-

    1. Find out the least count of the given instrument.

    2. Clean the micrometer stand so that there are no burrs on the anvils. Clean the measuring faces

    of micrometer with a cleaning cloth.

    3. Fix the micrometer to the stand horizontally, to avoid manual errors during handling.

    4. Check for zero errors of micrometer by closing the micrometer to 0 and note down the zero

    error, if any (ex.: -0.01mm or + 0.01mm)

    5. The selected (values) standard step gauges are taken and cleaned with a cloth and arranged in

    such a way that there would be no gap (wringing phenomenon) and placed between the anvils.

    6. The readings shown by the micrometer are noted and compared with the actual reading of slip

    gauges.

    7. Error and percentage error are calculated results and calculations are tabulated in the tabular

    column.

    8. The experiment is repeated for different readings of slip gauges (minimum 10 readings).

    Note: Always complete the entire range of the instrument by selecting appropriate values unless

    specified

  • Metrology lab manual.

    Ravi.K, Dept. of I&P Engg., PESCE, Mandya, Karnataka

    3

    Aim: To calibrate the given Micrometer using slip gauges.

    Apparatus Used:

    thimbleondivisionsofNo.Total thimbleoftion moved/rota Distance

    Slip gauge set, Micrometer, Micrometer stand, cleaning cloth

    Least count =

    =

    LC = ______mm

    Zero Error = ______mm

    Tabulation

    Sl.No Actual Reading Micrometer Reading Error Percentage Error

    Specimen calculation: -

    Actual reading of slip gauge (x)

    Micrometer reading

    Error = Micrometer reading - Actual reading

    Percentage error = readingActual

    Error

  • Metrology lab manual.

    Ravi.K, Dept. of I&P Engg., PESCE, Mandya, Karnataka

    4

    Expt. No 02

    CALIBRATION OF VERNIER CALIPER

    Aim: To calibrate the given Vernier calipers using given slip gauges.

    Theory: Vernier calipers are used to measure the outside diameter as well as inside diameter of

    cylinders. All parts of the instrument are made of good quality steel. It is commonly used in machine

    shop to measure the diameters of work piece.

    Apparatus: Vernier Caliper, Slip gauges, cleaning cloth

    Procedure:-

    9. Find out the least count of the given instrument.

    10. Clean measuring faces of Vernier caliper with a cleaning cloth.

    11. Check for zero errors of Vernier caliper by closing the micrometer to 0 and note down the

    zero error, if any (ex.: -0.02mm or + 0.02mm)

    12. The selected (values) standard step gauges are taken and cleaned with a cloth and arranged in

    such a way that there would be no gap (wringing phenomenon) and placed between the jaws.

    13. The readings of Vernier are noted and compared with the actual reading of slip gauges.

    14. Error and percentage error are calculated results and calculations are tabulated in the tabular

    column.

    15. The experiment is repeated for different readings of slip gauges (minimum 10 readings).

    Note: Always complete the entire range of the instrument by selecting appropriate values unless

    specified

    L.C. = 1 M.S.D 1 V.S.D. (consider the coinciding divisions of main and Vernier)

    = _______mm

    Zero Error = ______mm

    Tabulation

    Sl No Actual Reading Reading of Caliper Error Percentage Error

    Specimen Calculation:

    Error = Reading of caliper - Actual reading

  • Metrology lab manual.

    Ravi.K, Dept. of I&P Engg., PESCE, Mandya, Karnataka

    5

    Percentage error = readingActual

    Error

    Sl.

    No

    Actual

    (m)

    Instrument reading in (mm) Error % Error

    M.S.D V.S.D. T.R

    Given Calculated from Vernier Given

    cal

    Given cal given

    1

  • Metrology lab manual.

    Ravi.K, Dept. of I&P Engg., PESCE, Mandya, Karnataka

    6

    CALIBRATION OF CALIPERS

    Procedure:

    1. The least count of the instrument is calculated

    2. Standard slip gauges of known values are taken cleaned properly and arranged in such a way

    that these should be no air gap between them.

    3. The micrometer readings are noted and compared with actual results.

    4. Reading are tabulated in the tabular column

    5. Procedure is repeated for different values gauges.

    CALCULATIONS: -

    Least count of Dial Gauge = scaledialonmoveddivisionsofNo

    scalemainonmadedivisionsofNoorrotation )(1

    = 1/100 = 0.01mm

    Least count of calibration tester = rotationsdismicrometerondivisionsofNo

    scalemainonmovedceDis tan

    = 500

    5.0 = 0.001mm

    Actual Disc Reading = Dial Gauge Reading x L.C

    Correct disc reading (Instrumental Reading)= Micrometer disc reading Instrumented error given in

    chart

    Error = Actual Reading Instrumental Reading

    % Error = 100xreadingActual

    Error

    Sl.

    No

    Dial gauge

    Reading x LC

    mm

    Micrometer disc

    reading x LC

    (0.001) mm

    Instrumental

    Error from

    chart

    Instrumental

    reading

    Error % Error

  • Metrology lab manual.

    Ravi.K, Dept. of I&P Engg., PESCE, Mandya, Karnataka

    7

    Exp. No: 03

    CALIBRATION OF DIAL GAUGE

    AIM: - Calibration of dial gauge using dial indicator.

    Apparatus: - Dial gauge, dial calibration tester.

    Theory:- Dial indicators are instruments used for making and checking linear measurements. These

    require less skill than other precision instruments for their usage, like plug gauges, gap gauges,

    micrometers and Vernier scales etc. Dial indicators are smaller indicating devices containing a

    graduated dial lever magnification system. These are generally used as comparators is compare a part

    to a master setting. Some indicators known as dial micrometers or dial thickness gauge are however,

    also used for actual measurements when dial indicator is used as an essential part in the mechanism of

    any set up for compassion measurement purposes it is referred to as dial gauge.

    Most of the dial indicators take the form of a circular or semicircular scale upon which a pointer

    fives a direct indication of the movements of a contact arm or a spindle small changes of dimensions of

    the component in contact with the spindle are made to assume large proportions to scale by employing

    some mechanical reading to be obtained.

    A dial indicator by it self is not of much use unless it is properly mounted and set before using

    for inspection purpose. By mounting a dial Indicator on any suitable base and with various attachments

    it can be used on thousands of special gauges which manufacturers them selves design to meet the

    requirement of the job.

    Procedure: - 1. The L.C of the dial indicator is calculated

    2. The L.C of calibration tester is calculated.

    3. Rotate the dial tester circular disc to touch the points of contact of dial indicators & lock the

    spindle.

    4. Now loosen the 3 screws under the disc of dial tester and make the disc reading zero and again

    tighter the screws.

    5. Now make the reading of dial indicator zero.

    6. Fix the pointer to some specified reading and take the disc reading.

    7. Rotate the disc for 10mm displacement and take the disc reading.

    The instrument error is noted from the chart and total erro

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