DMT 630MA, Руководство пользователя

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APPENDIX 3 - READING A MILLIMETRE MICROMETER
Figure A3.1 Overview of the micrometer parts (actual reading 20000 µm = 20 mm)
Sleeve scale Thimble scale
Sleeve scale
The micrometer sleeve scale has a total length of 25
mm divided into 50 equal parts. Each part of a division
above the horizontal line represents 1 mm, where
each 5
th
line is marked by a longer line and a number
designating the length in mm. Each division below the
horizontal line is placed between each 1 mm mark
(scale above the horizontal line) and represents 0.5
mm.
Thimble scale
The thimble is divided into 50 equal parts, and
one complete rotation of the thimble is indicated
by the smallest division on the sleeve, which
equals 0.5 mm. Each division on the thimble scale
is 10 µm. If the thimble scale falls between two
lines, then a number between 0 and 10 µm must
be approximated.