Protractors measure the angle
between two surfaces of a part or assembly. Universal protractors,
combination sets, sine bars are used for angular measurement.
Protractors fall under the category of measuring tools.
Types of protractors available include universal or bevel
protractor. The protractor head slides onto the steel rule and
provides a tool for angular measurement or transfer. Universal
bevels, sliding bevels, combination bevels, or T-bevels are used to
transfer or duplicate angle measurements. Usually, bevels do not
have any graduations. Universal or bevel protractors have a base
arm and blade with a wide angular range. Bevel protractors have a
graduated, angular direct reading or Vernier scale located on a
large disc. Protractors can be level sensing or inclinometers.
Mechanical tools that indicate or measure the inclination of a
surface relative to the earth's surface usually in reference to
horizontal (level), vertical (plumb) or both axis.
Important specifications to consider when searching for protractors
include angular range and angular resolution. There are many
choices for scales or displays on protractors. These include none
or non-graduated, audible indicator or buzzer, column or bar graph,
dial, digital display, direct reading scale, remote display, and
Vernier scale. Features for protractors include machine or
instrument mounted, certificate of calibration, locking feature,
marking capability, and linear ruled protractor. |
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