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Metrology - exercises

Commented solution of the exercises of reading and interpretation of micrometer in thousandth and tenths of thousandth inch

MicrometerResults of the list of exercises:

micrometer - Exercises of reading and interpretation in thousandth and tenths of thousandth inch - Metrology

Results of the exercises of micrometer in inch

From website: www.stefanelli.eng.br - prof.: Eduardo Stefanelli

exercise readings interpretation
sleeve thimble
+
vernier
 
x
0.1in
+
x
0.025in
x
0.001in
+
x
0.0001in
sleeve
+
thimble
+
vernier
+
arch
0
+
0
0
+
0
    0.0   +
(0) 0.000 +
    0.000 +
    0.0   =
    0.000in 
this instrument is calibrated and ready for use. The vertical mark is partially revealed by the edge of the thimble, this condition varies depending on the setting and the condition of the micrometer. It is good practice to analyze how this mark is presented before starting the measurement.
0
+
1
0
+
0
    0.0   +
(1) 0.025 +
    0.000 +
    0.0   =
    0.025in 
see it revealed the first vertical mark, remember that the inch was divided by ten (tenth) and each of these divisions was divided by 4 (0.1/4). The 'zero' thimble is aligned. This indicates that the thimble has a full rotation (360°). Also note that the perimeter of the thimble for 25 divisions. This means that each division comprises 0.001in (0.025/25).
0
+
2
0
+
0
    0.0   +
(2) 0.050 +
    0.000 +
    0.0   =
    0.050in 
see it revealed the second vertical mark, indicating that the thimble has two turns. The thimble has 25 divisions
2x25 = 50 thousandths of an inch or half-tenth inch.
0
+
3
0
+
0
    0.0   +
(3) 0.075 +
    0.000 +
    0.0   =
    0.075in 
see it revealed the third vertical mark, indicating that the thimble has three turns. The thimble has 25 divisions
3x25 = 75 mils.
1
+
0
0
+
0
    0.1   +
(0) 0.000 +
    0.000 +
    0.0   =
    0.100in 
see it revealed the fourth vertical mark (the first numbered tenth of inch, this reference helps you unconcerned with intermediate traits), indicating that the thimble has four turns.
Note that the first number indicates tenths of an inch is visible as well: 1x0.1in = 1 tenth of an inch or one hundred thousandths of an inch.
1
+
0
12
+
0
    0.1   +
(0) 0.000 +
    0.012 +
    0.0   =
    0.112in 
the tenth of an inch follows the logic of the previous exercise, the 12 mils are read in the thimble, see who is the 12th division of the thimble is aligned with the zero mark of the sleeve scale.
1
+
0
7
+
0
    0.1   +
(0) 0.000 +
    0.007 +
    0.0   =
    0.107in 
the tenth of an inch follows the logic of the previous exercise, the 7 mils are read in the thimble, see who is the 7th division of the thimble is aligned with the zero mark of the sleeve scale.
6
+
0
10
+
0
    0.6   +
(0) 0.000 +
    0.010 +
    2.0   =
    2.610in 
the six-tenths of an inch follows the logic of the previous exercises, the ten thousandths of an inch are read in the thimble, see who is the 10th division of the thimble is aligned with the zero mark of the sleeve scale. The two inches can be read both in the sleeve scale (2 instead of 0) and labeling of the 'range' of the instrument has the range 2 to 3 inches.
8
+
3
20
+
0
    0.8   +
(3) 0.075 +
    0.020 +
    1.0   =
    1.895in 
The eight-tenths of an inch follows the logic of previous exercises after eight sleeve scale displays three vertical marks 3x25 = 75 thousandths of an inch, is added to these 75 to 20 mils indicated in the thimble.
The whole inch is inferred by the 'range' of the micrometer.
3
+
2
12
+
0
    0.3   +
(2) 0.050 +
    0.012 +
    3.0   =
    3.362in 
the three-tenths of an inch follows the logic of the previous exercises, after three to sleeve scale displays two vertical marks: 2x25 = 50 thousandths of an inch, sum up these 50 to 12 mils indicated on the thimble.
The three-inch is inferred by the 'range' of the micrometer.
5
+
2
9
+
0
    0.5   +
(2) 0.050 +
    0.009 +
    0.0   =
    0.559in 
The five tenths of an inch follows the logic of previous exercises after five sleeve scale exhibits two vertical marks: 2x25 = 50 thousandths of an inch, is added to these 50 mils 9 mils indicated in the thimble.
2
+
1
12
+
(5)
    0.2      +
(1) 0.025    +
    0.012    +
    0.000(5) +
    2.0      =
    2.237(5)in 
two tenths of inch after him the sleeve scale displays a vertical mark 1x25 = 25 mils, sum up these 25 12 mils indicated in the thimble, but it is clear that the 12 'pass' mark and the 13 'not arrived' the zero mark, which was played halfway, hence the (5) ten-thousandths.
The whole two inches come by 'range' of the micrometer and the second at the beginning of the scale of the sleeve scale.
4
+
0
23
+
(3)
    0.4      +
(0) 0.000    +
    0.023    +
    0.000(3) +
    0.0      =
    0.423(3)in 
four-tenths of inch after him the sleeve scale does not display vertical marks: 0x25 = 0.000, sum up 23 mils indicated in the thimble, but it is clear that the 23 'went' a bit mark and the 24 'did not come' to zero mark, which was played before halfway, hence the (3) ten-thousandths.
7
+
3
11
+
(7)
    0.7      +
(3) 0.075    +
    0.011    +
    0.000(7) +
    1.0      =
    1.786(7)in 
seven tenths of inch after him the sleeve scale displays three vertical marks: 3x25 = 75 000, sum up these 75 11 mils indicated in the thimble, but it is clear that the 11 'pass' mark and the 12' has not arrived 'the zero mark, interpreted that went half way, then the (7) ten-thousandths.
The whole inch is the 'range' in the 1-2 micrometer.
2
+
0
12
+
6
    0.2    +
(0) 0.000  +
    0.012  +
    0.0006 +
    0.0    =
    0.2126in 
two tenths of inch after him the sleeve scale does not display vertical marks: 0x25 = 0.000, sum up the 12 mils indicated in thimble and six-tenths of a thousandth of an inch markd the sixth mark of the sleeve vernier for the thimble.
3
+
0
0
+
2
    0.3    +
(0) 0.000  +
    0.000  +
    0.0002 +
    0.0    =
    0.3002in 
three tenths of inch after him the sleeve scale does not display vertical marks: 0x25 = 0.000, sum up the 0 mils indicated in thimble and two-tenths of a thousandth of an inch markd the second mark of the sleeve vernier for the thimble.
9
+
0
24
+
4
    0.9    +
(0) 0.000  +
    0.024  +
    0.0004 +
    0.0    =
    0.9244in 
nine-tenths of inch after him the sleeve scale does not display vertical marks: 0x25 = 0.000, sum up the 24 mils indicated on the thimble and the four ten-thousandths of an inch in the room markd sleeve scale mark the thimble.
7
+
0
3
+
8
    0.7    +
(0) 0.000  +
    0.003  +
    0.0008 +
    0.0    =
    0.7038in 
seven tenths of inch after him the sleeve scale does not display vertical marks: 0x25 = 0.000, sum up the 3mils listed in the thimble and eight-tenths of a thousandth of an inch markd the eighth feature of the sleeve vernier by the thimble.
4
+
2
11
+
3
    0.4    +
(2) 0.050  +
    0.011  +
    0.0003 +
    0.0    =
    0.4613in 
the four-tenths of an inch follows the logic of the previous exercises, after four to sleeve scale displays two vertical marks 2x25 = 50 thousandths of an inch, sum up these 50 to 11 mils indicated on the thimble and the three ten-thousandths of an inch markd the third feature of the vernier by the thimble.
9
+
3
8
+
7
    0.9    +
(3) 0.075  +
    0.008  +
    0.0007 +
    0.0    =
    0.9837in 
nine-tenths of inch after him the sleeve scale displays three vertical marks: 3x25 = 75 mils, is added to these 75 listed in the 8 mils thimble and seven-tenths of a thousandth of an inch on the seventh mark dash sleeve vernier by the thimble
obs. x
0.1in
+
x
0.025in
x
0.001in
+
x
0.0001in
sleeve
+
thimble
+
vernier
+
arch
 
Eduardo J. Stefanelli - www.stefanelli.eng.br