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Home > Ordnance Documents and other related manuals > > Outside Calipers.
Calipers and Dividers
Inside Calipers.

Use And Care Of Handtools And Measuring Tools
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USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
FIGURE 175.
DIVIDERS.
(2) Outside Calipers.  Outside calipers (figure 176 on the following
page) are used to measure distances over and around adjacent surfaces, and
to transfer the measurements to a rule.  Several types are made in several
sizes to accommodate a wide range in measurement.  The size of the caliper
is expressed in terms of the maximum dimension it is capable of measuring.
A  3  inch  caliper,  for  example,  will  measure  a  distance  of  3  inches.
Actually, the maximum capacity of the caliper will be greater, often as much
as one third.  This means that a 3 inch caliper will actually measure up to
4 inches.  It is not recommended that you use a 3 inch caliper to measure 4
inches,  since  you  may  spring  the  legs,  resulting  in  an  inaccurate
measurement.
NOTE
Never set a caliper on work that is revolving in a
machine.
The contact of one leg of a caliper on a
revolving surface will tend to draw the other leg over
the work because of the friction between the moving
surfaces.  Only a slight force is necessary to spring
the legs of a caliper so that measurements made on
moving surfaces are never exact.
225






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