aims

Topics: Vernier scale, Caliper Pages: 2 (441 words) Published: June 16, 2014
O-30 (2003) full size

12/8/03

10:13 PM

Page 1

CALIPERS

How to Read Vernier Calipers
Fractional Reading Vernier Scale.
1/16" on the main beam is subdivided
into eight or to 1/128".

Because of .300" inside jaw thickness,
the vernier is placed .300" off from
zero point.
Position of the
vernier plate can
be readjusted.

1/16"

Graduations
on the main beam.

Decimal Reading Vernier
Scale. 1/40th of an inch is
subdivided into 25 by the
vernier to read to onethousandth. One inch is
first divided into ten, and
then 40 graduations.
Each smallest graduation
on the main beam represents .025".
Inch Fractional and Decimal Readings
This vernier caliper has two scales which enable readings to a fraction of an inch as in the case of 1/128" graduated vernier (upper scale), or in decimals as in the
case of 1/1000" graduated vernier (lower scale).
Each division on the fractional main scale represents
1/16th of an inch. The vernier further subdivides each
division on the main scale to read 1/128 of an inch.
Each division of the decimal main scale represents one
fortieth of an inch or .025". Each fourth line marked by 1
represents .100", the line marked 2 represents .200",
and so forth. The vernier consists of 25 equal divisions
which further subdivides each division on the main
scale to .001".
1. 1/128" graduated vernier (upper scale)
Readings on the main scale................................16/16" Vernier scale reading ...........................................3/128" Final reading...........................16/16 + 3/128 = 151/128" 2. 1/1000" graduated vernier (lower scale)

Main scale reading ............................................1.375" Vernier scale reading......................................... .023" Final reading ....................................................1.398"

O-30

.300"
Rounded inside
jaws. Thickness
.300" when closed.

Inch Decimal Reading Only (for Inside and
Outside Jaws)
The vernier reads...
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