10-10-2012, 01:36 PM
Linear and Angular Measurement
Linear and Angular.ppt (Size: 3.8 MB / Downloads: 92)
Definition
Metrology is the name given to the science of pure measurement.
Engineering Metrology is restricted to measurements of length & angle
Linear and Angular Measurement
The Linear Measurement includes measurements of length, diameters, heights and thickness
The Angular measurement includes the measurement of angles or tapers
Measurements
Measurement systems are mainly used in industries for quality control.
Often widely using measurements are
Linear Measurement
Angular measurement
Dimensions
A very common measurement is that of dimensions, i.e., length, width, height of an object
Dimensions of the measuring instruments are classified as follows
Low resolution devices (up to 0.25mm)
Medium resolution devices (up to 0.0025mm)
High resolution devices (less than microns)
VERNIER CALIPER
Vernier calipers are available in size of 150 mm, 225 mm, 900 mm and 1200 mm.
The selection of the size depends on the measurements to be taken.
Vernier calipers are precision instruments, and extreme care should be taken while handing them.