Technical Terms in Linear and Angular Measurements

TECHNICAL TERMS

· Comparators

Comparators are one form of linear measurement device which is quick and more convenient for checking large number of identical dimensions.

· Least count

The least value that can be measured by using any measuring instrument known as least count. Least count of a mechanical comparator is 0.0 1 mm.

· Caliper

Caliper is an instrument used for measuring distance between or over surfaces comparing dimensions of work pieces with such standards as plug gauges, graduated rules etc.

· Interferometer

They are optical instruments used for measuring flatness and determining the length of the slip gauges by direct reference to the wavelength of light.

· Sine bar

Sine bars are always used along with slip gauges as a device for the measurement of angles very precisely.

· Auto-collimator

Auto-collimator is an optical instrument used for the measurement of small angular differences, changes or deflection, plane surface inspection etc.