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EXTERNAL MICROMETERRef Document: IS: 2967 - 1983( First Revision)

1

2A is the lower limit ( that is zero setting) of the measuring range in millimeters.

345

Permissible Flexture of Frame Subject to a force of 10 N and Tolerances on the Zero setting on Parallelism Faces and Error of Measurement

mm0 to 25 2 ±2 2 4

25 to 50 2 ±2 2 450 to 75 3 ±3 3 5

75 to 100 3 ±3 3 5100 to 125 4 ±4 4 6125 to 150 5 ±4 4 6

VERNIER CALIPERRef Document : IS: 3651 ( Part I ) - 1982 for Least Count 0.1mm and 0.05 mm

IS :3651 ( Part 2 ) -1985 for Least count 0.02Type A: With Jaws on both sides for external and internal measurements and with a blade for depth measurement(optional).Type B With Jaws on one side for external and internal measurements.As per IS 3651 - 1985 Part 2

1 Parallelism of Internal Measuring Faces = 0.01mm2 Parallelism of External Measuring Faces( t ) = e/33

This Standard applies to micrometer fitted with a screw of pitch 0.5 or 1 mm having a maximum range of 25 mm of least count 0.01 mm covering capacities up 500mm , and having non-removable anvil with measuring faces.

This standard does not apply to digital reading micrometers but may be used for indicating desirable requirements for such micrometers where appropriate.

The deviation of traverse of the micrometer spindle over a range of 25mm shall not exceed 3 µm.The deviation of traverse of micrometer is usually checked by taking reading on a series of slip gauges.

Tolerance on Zero Setting (f) =±(2+ A/50) µm

The maximum Permissible error of measurement F max = ( 4+ A/50)µmTolerance on Parallelism of Measuring Faces(f p) =±( 2 + A/50)µmThe measuring faces shall be lapped and each face shall be flat to within 1µm

Measuring Range of Micrometer

Permissible Flexture of Frame

Tolerance on Zero Setting (f)

Tolerance on Parallelism of Measuring Faces(f p)

Error of Measurement ( F max)

µm µm µm µm

Error in reading ( e ) =±(20+0.05L ) µm

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mm0 ±20 10

100 ±30 10200 ±30 10300 ±40 15400 ±40 15500 ±50 20

Measuring Uncertainty The Permissible measuring uncertainty in micrometers at ±2s, 95 % confident level = ±(50±0.1l)l = measured length.

DIAL HEIGHT GAUGE AND VERNIER HEIGHT GAUGESRef Document IS : 2921- 1988 ( First Revision)

1 The base shall be ground and lapped to with in flatness error 0.005 mm as measured over the total span of the surface considered.2 Permissible errors on the beam in below Table

mm mm mm250 0.025 0.040300 0.030 0.045500 0.050 0.075750 0.075 0.100

1000 0.100 0.1503 The measuring faces of the scriber shall be flat and parallel to within 0.005mm4

Measured Length (L)

Maximum Permissible Error in Reading ( e )

Maximum Tolerance on Parallelism of External Measuring Faces ( t )

µm µm

Measuring Range

Permissible Error in Flatness of Guiding Edge

Permissible Error in Flatness of Beam Face

Measuring Error ( e ) = ± (20 + 0.05 L) µm

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mm0 ±20

100 ±30200 ±30300 ±40400 ±40500 ±50600 ±50700 ±60800 ±60900 ±70

1000 ±70MECHANICAL BEVEL PROTRACTORS

Ref Document IS : 4239 - 1970 ( First Revision)

Type A

Type B

Type C

Type D Bevel Protector graduated in degrees and is not provided with either vernier or fine adjustment device or acute angle attachment

1 Blade

Size of Blade

mm150 150 10 15 ±5200 200 15 20 ±5300 300 20 30 ±5

Measured Length ,( L )

Permissible Measuring Error, e ,at ±2s ( 95 %)

µm

Bevel Protector provided with a vernier graduated to read to 5 minutes of arc and also with a fine adjustment device and acute angle attachment.

Bevel Protector provided with a vernier graduated to read to 5 minutes of arc and an acute angle attachment but without fine adjustment device.

Bevel Protector provided with a vernier graduated to read to 5 minutes of arc but without fine adjustment device or acute angle attachment.

Flatness of Blade

Straightness of working Edges

Parallelism of working Edges

Angular Tolerance for Bevelled Ends in Minutes of Arc

µm µm µm µm

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2 Acute angle Attachment

3 Error of Readings

3a

3bThe total error of indication in any position of the blade of Type D mechanical bevel protractors shall not exceed ± 12 minutes of arc.

PLUNGER TYPE DIAL GAUGERef Document IS :2092 - 1983 ( First Revision )TYPE 1 0.01 Dial GaugeTYPE 2 0.002 Dial Gauge

1 Measuring small movements, of the order of 0.025 mm for 0.01 and 0.004mm for 0.002 mm dial gauges2 Sensitivity , Accuracy, Repeatability. All are in millimeters

Requirements

Limits of Error

0.025 0.003 _

0.005 _ 0.001Repeatability 0.002 0.0005

Accuracy Any 1/10 th rev. 0.005 0.001Any 1 rev. 0.01 0.004Any 2 revs. 0.015 0.006

0.02 0.018For 0.01 mm Reading dial GaugeDivision of Dial 0 10 20 30 40 50 60 70 80 90TURN I Set + 1 + 3 + 2 0 -1 + 1 + 3 + 2 +4TURN II + 1 0 -2 + 1 -1 0 + 2 -4 -1 + 2TURN III +4 + 1 _ _ _ _ _ _ _ -3TURN IV -4 _ _ _ _ _ _ _ _ _TURN V +5 +4 _ _ _ _ _ _ _ + 1TURN VI -2 _ _ _ _ _ _ _ _TURN VII + 2 +4 _ _ _ _ _ _ _ -2TURN VIII -5 _ _ _ _ _ _ _ _

Working edge shall be straight to within 0.005mm and according to the type of the attachment, shall be parallel with, or square to ,the working edge of the stock to within 0.015 mm over the length of the attachment in all its position.

The total error of indication in any position of the blade of Types A, B and C mechanical bevel protractors shall not exceed ± 5 minutes of arc.

0.01 Dial Gauge

0.002 Dial Gauge

Sensitivity( including

hysteresis) for Change of

Any larger up to 10 revs

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TURN IX -4 + 2 _ _ _ _ _ _ _ + 2TURN X + 1 _ _ _ _ _ _ _ _ _

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LEVER TYPE DIAL GAUGERef Document IS :11498 - 1985

1 Tolerances of Error of Reading For 0.01 mm reading Lever Type Dial Gauges

Limits of Error

mmAny 0.1 mm 0.005Any half rev. 0.01

Total 0.0152 Sensitivity 0.002 mm

FEELER GAUGESRef Document IS :3179:1990 ( Second Revision

1 Tolerance on Thickness of Blades

mm mm mm

±0.004 0.004

±0.005 0.005

±0.008 0.008

±0.010 0.010V- BLOCKS

Ref Document IS :2949:1992Types of V- Block

1 Type A1 with single Vee and side and end faces as contact surfaces.2 Type A2 with two Vees and side and end faces as contact surfaces.3 Type B1 with Single Vee and side and end faces not intended as contact surfaces.4 Type B1 with two Vees and side and end faces not intended as contact surfaces.

Requirement Over an Interval of

Nominal Thickness of Blade

Permissible Departure from Nominal Thickness

Permissible Variation in Thickness of Blade

0.03 up to and 0.04

Above 0.04 up to and including

0.35

Above 0.35 up to and including

0.65

Above 0.65 up to and including

1.00

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V - AngleGrade V- Blocks shall be of three grades, namely Grade 0,1 and 2.

α = 90° or 108°

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V- BLOCKS DESIGNATIONIS :2949 -- 50X 150 --A1 -- 1--P

Pair ( Omitted incase of single block)

Accuracy Grade

Width ,Length Type

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t1 t2,t3,t4,t5 t6,t7 t80 ±1' 2 + l/500 3+ l/250 2+ h1/100 2001 ±2' 4 + l/250 6+ l/100 4+ h1/50 4002 ±2' 10 + l/100 12+ l/50 10+ h1/25 400

Values of 'l' and 'h1' are in mmt1 Flatness tolerance of base surfaces and mounting Faces

t2

Grade of V- Block

Vee angle Tolerance

Form and Positional Tolerance in µm

Parallelism tolerance of the lines of contact of a geometrically ideal cylinder with mounting surfaces to the reference surface.

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t3

t4

t5 Parallelism tolerance of lateral surface to each other.

t6 Perpendicularity tolerance of the front surface to the Reference Surface.

t7Perpendicularity tolerance of the front surface to the Reference Surface.

t8 Symmetry tolerance of the groove to the mid plane of a mounting surfaces.

ANGLE PLATERef Document IS :2554 - 1971

Grade

mm mm mm1 0.008 0.015 0.018 0.0182 0.038 0.075 0.088 0.088

SURFACE PLATERef Document IS :12937:1990

Flatness

Identify the Best Area in the Plate.HARDNESS TESTER

Ref Document IS :1586 :2000Permissible Error on Testing Machine

Parallelism tolerance of the lines of contact of a geometrically ideal cylinder with mounting surfaces to the mid plane of a parallel lateral surfaces.

Symmetry tolerance of the mounting surface to the mid plane of a parallel lateral surfaces.

Flatness of working Faces

Squareness of Exterior Faces

Parallelism of Opposite Faces and Edges

Squareness of End Face w.r. to Exterior Face

µm

Add the Extreme Values in µmPermissible Flatness = 6.7 µm (1000 X 1000 mm Surface Plate)

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PLUG GAUGES , RING GAUGES,SNAP GAUGESRef Document IS :3455 - 1971For Plug Gauges( Inside Measurements)NO GO SIZE = G ± H/2

GO SIZE NEW = ( K+ z)±H/2G = higher limit for work piece.

GO SIZE WEAR LIMIT = K-y K = lower limit for work piece.

For Ring, Snap Gauges( Outside Measurements)

GO SIZE NEW = ( G - z1)±H1/2

NO GO SIZE = ( K + α1) ± H1/2

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GO SIZE WEAR LIMIT = G + y1 - α1 H/2,y,z, H1/2,y1,z1,α1 from Tables.

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