Comparators
COMPARATORS
Comparators
are one form of linear measurement device which is quick and more convenient for
checking large number of identical dimensions. Comparators normally will not show
the actual dimensions of the workpiece. They will be shown only the deviation in
size. i.e. During the measurement a comparator is able to give the deviation of
the dimension from the set dimension. This cannot be used as an absolute measuring
device but can only compare two dimensions. Comparators are designed in several
types to meet various conditions. Comparators of every type incorporate some
kind of magnifying device. The magnifying device magnifies how much dimension
deviates, plus or minus, from the standard size. The comparators are classified
according to the principles used for obtaining magnification.
The
common types are:
1)
Mechanical comparators
2)
Electrical comparators
3)
Optical comparators
4)
Pneumatic comparators
