Outside Micrometer-parts-measurement using micrometer-errors in reading micrometer-measurement using vernier micrometer.

1. Outside Micrometer
Presented by
K.LAKSHMINARAYANAN
Asst.Trg Officer

2. Parts of Outside
Micrometer
1. Anvil
2. Spindle face
3. Spindle
4. Barrel
5. Thimble
6. Ratchet stop
7. Spindle lock
8. Frame

3. Outside Micrometer
a) Reading on the Sleeve
in 1 mm divisions
12.00 mm
b) Reading on the Sleeve
in 0.5 mm division
0.50 mm
c) Thimble has passed 16
divisions line on the Sleeve
(16 X 0.01 mm) 0.16 mm
TOTAL READING 12.66 mm

4. Measurement errors in
Micrometer

5. Reading of dimensions
measured using
Vernier Micrometer
(1) Reading on the Sleeve
(5 Main divisions x 1 mm)
5.000 mm
(2) No. of lines between
0.5 mm and the edge of
the thimble
(1 sub division x 0.5 mm)
0.500 mm
(3) Thimble has passed 28
divisions on line of the Sleeve
(28 Thimble divisions x 0.01 mm)
0. 280mm
(4) Vernier line that coincides
exactly with a Thimble Line
(3 Vernier divisions x 0.001 mm)
0.003 mm
TOTAL READING 5.783mm
(2)
(3)
(4)
(1)

6. Reading of dimensions
measured using
Vernier Micrometer
(1) Reading on the Sleeve
(5 Main divisions x 1 mm)
5.000 mm
(2) No. of lines between
0.5 mm and the edge of
the thimble
(1 sub division x 0.5 mm)
0.500 mm
(3) Thimble has passed 28
divisions on line of the Sleeve
(28 Thimble divisions x 0.01 mm)
0. 280mm
(4) Vernier line that coincides
exactly with a Thimble Line
(3 Vernier divisions x 0.001 mm)
0.003 mm
TOTAL READING 5.783mm
(2)
(3)
(4)
(1)