A Measuring Device for temperature,humidity and distance from any object
Full description
Description complète
Calibration of Bourdon Gauge
Calibration
Descripción completa
Descripción: this is a report from a practice in my school, it describes types, class and uses for this tool, usefull for all who works design, modelling; etc.
Vernier CaliperDescripción completa
Parts of vernier calliperFull description
para proyectosDescripción completa
this is a report from a practice in my school, it describes types, class and uses for this tool, usefull for all who works design, modelling; etc.
Descripción: NOMENCLATURA DEL VERNIER
Descripción: En este documento se muestran los tipos de vernier, sus partes, la metodología para medir con ellos y los cuidados al realizar mediciones con ellos.
Vernier caliper is a precision instrument that can be used to measure internal and external distances extremely accurately.
Here, readings are interpreted from the scale by the user.
Vernier caliper has two scales – main scale and vernier scale as shown in figure below.
Here, Least count of vernier caliper = one main scale division - one vernier scale division. In our given caliper, Least count = 0.02 mm
Length of given species = Main scale division + ( No. of vernier scale division * Least count)
PROCEDURE:
Adjust zero-zero of the vernier caliper.
Set up a standard length using slip gauges. First use individual gauges, and then in combinations of two or more.
To join two blocks press the shiny surfaces of the two blocks against such that the clocks are perpendicular to each other. Then, turn the blocks, while pressing them against each other, such that the profile of one covers the profile of the other.
Measure the same dimension with vernier caliper.
The dimension with slip gauge minus reading on the vernier caliper is the error. 3
Repeat the same over a number of parts in the whole range.
OBSERVATIONS: Here, reading given on gauge block as true value and vernier reading as measured value. ( )
Percentage error =
Table 1: Sr.No
Gauge Reading( mm)
Vernier reading(mm)
% error
1
1.04
1.06
1.92
2
1.1
1.1
0
3
1.3
1.3
0
4
1.38
1.43
5
1.4 1.5
1.5
0
6
4
4.02
0.5
7
5
5
0
8
8
8.02
0.25
9
10
10.02
0.2
10
12.5
12.46
0.32
11
15
14.98
0.13
12
17
16.98
0.12
13
20
19.98
0.1
14
22
22
0
15
25
25
0
16
50
50
0
17
75
75
0
Sr.No
Combination of gauges(mm)
Gauge reading(mm)
Vernier reading(mm)
% error
1
1.46+3.50
4.96
4.98
0.40
2
3.00+5.50
8.5
8.5
0
3
6.50+1.14
7.64
7.62
0.26
4
7.50+12
19.5
19.5
0
5
13+13.5+14
40.5
40.5
0
6
6.5+16+24.5
47
47.04
0.08
7
22.5+23.5+13.5+11
70.5
70.5
0
Table 2:
4
GRAPHS: Graph 1:
Error Vs Gauge reading 2.5 2 1.5
r o r 1 r e %0.5
0 -0.5
0
20
40
60
80
Gauge readings(in mm) Graph 2:
Error Vs Gauge reading 0.5 0.4 0.3
r o r r 0.2 e %
0.1 0
-0.1
0
20
40
60
80
Gauge reading( mm)
CONCLUSIONS:
The error in the actual gauge values and the vernier readings is less than 2% that may or may not be negligible; it would depend on the application.
The maximum value of error that occurs is 0.04 mm.
Combinations of gauge blocks may lead to error because of imperfections in the joint surfaces.
The method adopted is time consuming.
The measurements need to be conducted in a controlled environment to avoid thermal expansion in the blocks.
The gauge blocks need to be held with care as they have highly finished surfaces, which may get damaged if the blocks are dropped.