LINEAR MEASUREMENT. Prof.H M Prajapati & Prof. A R Sankhla
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1 LINEAR MEASUREMENT
2 Introduction Classification Based on the type of standard Line measurement End measurement Based on precision Precise Direct: Vernier caliper, Micrometer Indirect: Telescopic gauge, bore gauge Non-precise Direct: Steel rule Indirect: Caliper
3 Engineer s Steel rule Material: Hardened steel L. C. = 0.5 or 1 mm Length = 150, 300, 600, 1000 mm Types: Shrink rule, folded form Parallax
4 CALIPERS Material Leg: Carbon steel or alloy steel Hardness: 650 ±50 HV Spring: Carbon spring steel Classification Spring and Firm joint caliper Outside, Inside, Transfer, Hermophrodite Nominal size Firm joint caliper: 100, 150, 200, 300 mm Spring caliper: 75, 100, 150, 200, 250, 300 mm
5 Outside CALIPERS How to get numeric value?
6 Inside CALIPERS How to get numeric value?
7 CALIPERS Inside caliper (Firm joint & Spring) Outside caliper (Firm joint & Spring)
8 Transfer CALIPERS
9 Hermophrodite CALIPER
10 Divider
11 Vernier caliper When two scales or divisions slightly different in size are used, then difference between them can be utilized to enhance the accuracy of measurement.
12 Vernier Caliper Parts of vernier caliper
13 Vernier Caliper (cont.) All values are in cm Different L.C in vernier caliper
14 Vernier Caliper (cont.) Reading vernier caliper
15 Vernier Caliper (cont.) Type A vernier caliper
16 Vernier Caliper (cont.) Type B vernier caliper
17 Vernier Caliper (cont.) Type C vernier caliper
18 Vernier Caliper (cont.) Material Steel Hardness: 650 HV min. Range: 0-125, 0-200, 0-250, 0-300, 0-500, 0-750, , , 750, 2000 mm Flatness 0.05 mm for nominal lengths upto 300 mm Straightness 0.01 mm for measuring range of 200 mm Precautions in use Errors
19 Vernier Height Gauge
20 Vernier Height Gauge Base Flatness: mm Beam Parallelism of measuring jaw by mm/ 10 mm projection of scriber when 1 kg is applied at maximum height of scriber Straightness of guiding edge 0.02 (250), 0.04(500), 0.06(750), 0.08(1000) Flatness of beam face 0.04 (250), 0.06(500), 0.10(750), 0.12(1000) Perpendicularity 0.04 mm /100 mm
21 Vernier Height Gauge Measuring jaw and scriber Parallelism of jaw face with base: mm Graduation Thickness of graduation: 0.05 to 0.1 mm Length of graduation: 2 to 3 times the width of interval between adjacent lines Measure of height Slider Good sliding fit
22 Vernier Depth Gauge
23 Dial Caliper (cont.)
24 Digital Caliper
25 Micrometer Principal of Micrometer Micrometers work on the principle of screw and nut When a screw is turned through nut by one revolution, it advances by one pitch distance If circumference of the screw is divided into number of equal parts say n, its rotation through one division will cause the screw to advance through (pitch/n) length Thus the minimum length that can be measured by such arrangement will be ( pitch/n)
26 Least count of Micrometer L.C = (Pitch of the thread / total numbers of divisions on the thimble) = ( Pitch / n) = ( 0.5 / 50) L.C = 0.01
27 Micrometer
28
29 Micrometer Frame Material Cast steel, steel or malleable cast iron, light alloy Stiffness: 1 kg force should not change distance by 1.5µm for 0-25 range, 2µm for range Anvil and spindle About 3mm protrusion from frame Tungsten carbide tip Ratchet driver 0.5 to 1 kgf Thimble and barrel Adjusting nut
30 How to read Micrometer? Zero error Reading a micrometer
31 VERNIER MICROMETER Vernier micrometer
32 Use of Ratchet Mechanism To maintain uniform contact pressure less than 1 kgf. It completely remove the error because of lack of sense of feel.
33
34 Precaution used for micrometer The micrometer should be wiped clean and free from oil, dirt, dust etc. Start with zero setting on micrometer. Use spanner to correct the error with slight rotation of barrel. Micrometer dimension is set slightly larger than the size of Part whose dimensions to be measured and part is slid over the contact surfaces of micrometer. After this thimble is turned till the measuring tip just touches the part and the final movement should be done by ratchet. The micrometers are available is various sizes and ranges, select appropriate micrometer.
35 Errors Anvil and spindle tips should be parallel and flat to each other. Axis of both should be coincide to each other. Zero error. Wear of threads.
36 Depth micrometer
37 Inside micrometer spacing Collar Extension rods
38 Inside Micrometer Main Parts Measuring Head
39
40 Possible ranges with extension bar
41 SLIP GAUGE Johannsen gauges Cross-section:30 mm 09 mm Classification As per accuracy Master slip gauge AA: ±2µ/m Reference slip gauge A: ±4µ/m Working slip gauge B: ±8µ/m As per grade Grade 2: Workshop grade Grade 1: Tool room work (setting up sine bar & Dual Gauge, checking gap gauges) Grade 0: Inspection grade (Inspection Dept.) Grade 00: Calibration of Grade 2
42 SLIP GAUGE
43 SLIP GAUGE Size Upt0 10 mm: 30 mm 9 mm Above 10 mm:35 mm 9 mm Grades Grade 0, Grade I, Grade II Material High grade steel with coefficient of thermal expansion (11.5±1.5) 10-6 per degree Celsius between 10 C and 30 C Hardness: 800HV Indian standard on slip gauges
44 SLIP GAUGE microns Wringing of slip gauges
45 Slip Gauge set as per Indian Standard M45/1 & M86/1
46 Selection of slip gauges for required Make a stake of dimension Always start with the last decimal place and deduct this from the required dimension. For example, let s the dimension is to be built up is Here for last decimal place of 0.009, select mm slip gauge. Now dimension left = = mm Select next smallest figure in the same way, find the remainder and continue this until the required dimension is completed
47 In our example second decimal place is 1.08,select 1.08 mm slip gauge Now remainder = = 53.2mm Now select 1.2 mm and 52 mm is the remaining dimension. Now select 2 mm slip gauge so remainder 50 mm. 50 mm slip gauge is available directly. Thus we have = mm
48 Care & Use of slip Gauges. Surfaces should be covered with petroleum jelly or other corrosive resistance coatings. When the gauges are not in use they should be kept in their case with size. The gauges should be used in air conditioner rooms free from dust and dirt. The fingering/handling of lapped faces should be avoided as far as possible that may corrode surfaces due to natural acid in the skin. The working surfaces should never be placed on surface plate. Use standard wringing process to make stake of gauges. The gauges should never be left wrung together for an unnecessary length of time. This may lead to micro cold welding which may cause pitting of surface when they are separated.
49 SURFACE PLATE Purpose Datum simulator for linear and angular measurement Test degree of flatness of other surfaces Material Properties Rigidity Wear resistance Hardness Corrosion resistance Capable to take high surface finish Material Cast Iron Granite Glass Manufacturing of plate Straightness 0.08 mm per meter Flatness ± to ±0.005 (150 mm diagonal) ± 0.02 to ±0.04 (2000 mm diagonal)
50 Care & Use of Surface Plate Before and after use of surface plate, it should be wiped clean from dust and other particles. Surface plate should be placed in stirred atmosphere under constant temperature control. Keep it away from direct sunlight. Load should be distributed over working surface. Full area of plate should be utilized. Do not concentrate on particular area. The excess metal due to burrs on the surface of CI surface plate should be removed. Flatness should be checked occasionally. Protect it against damage by direct falling of heavy objects. When not in use, it should always be kept oil lubricated in cover.
51 ANGLE PLATE Material Cast Iron Purpose Accessory to surface plate
52
53 V-BLOCK Purpose To hold the object Checking roundness Marking centers Material Cast Iron Angle 90, 120
54 FEELER GAUGE Purpose To measure the gap/clearance between two flat parallel surfaces. Thickness 0.03 to 1 mm Width 10 mm at heel side 6 mm at tip Set Eight blades 0.03 to 0.1 in steps of 0.01
55 Sr No No. of blades Thickness of blades in mm to 0.1 in steps of , 0.03, 0.04, 0.04, 0.05, 0.05, 0.06, 0.07, , 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, , 0.04, 0.05, 0.06, 0.07, 0.1, 0.15, 0.2, 0.4, , 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.75, , 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.4, 0.75, , 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0
56 RADIUS GAUGE
57 THREAD PITCH GAUGE
58 STRAIGHT EDGE Purpose Checking straightness and flatness Material Steel (2 m) Cast Iron (3 m) Grade Grade A Scraping mm/100 mm Grade B Milling mm/100 mm Working length and total length
59 STRAIGHT EDGE (CONTD.)
60 Combination Set
61 COMBINATION SET
62 COMBINATION SET
63 SMALL BORE GAUGE
64
65 TELESCOPIC GAUGE
66 PIN GAUGE METHOD TO MEASURE BORE DIAMETER
67 PIN GAUGE METHOD TO MEASURE BORE DIAMETER
68 Four Ball Method
69
70 Parallax error numerical Chapter 1 Introduction Worked Examples Q 1.8 Book: Engineering Metrology by R K Jain
71 Transfer from line standard to end standard Chapter 3: Topic Book: Engineering Metrology by R K Jain Solved Examples: Q. 3.3 and 3.4
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