VERNIER DEPTH GAUGE

Application of vernier depth gauge

Vernier depth gauge

A vernier depth gauge is a very commonly used precision instrument for the measuring of holes, recesses, slots and steps. Its construction and method of reading are similar to those of a vernier calipers. Parts of a vernier depth gauge 

Base(1),graduated beam(2),clamping screw(3),fine adjustment mechanism(4),vernier scale(5).The base is the fixed unit and serves as a datum for measurement. It also carries the vernier scale and the fine adjustment mechanism. The beam with the main scale gradutions is the sliding member or part. Fine adjustment for measurement are made after tightening the clamping screw and the fine adjustment mechanism while taking measurement the base should be firmly held against the reference surface. The relief  given at the end of the beam of some vernier height gauges is to  avoid the seating in the corners of slots and to ensure correct reading.Remove burrs, if any, before taking measurements. Excessive pressure on the beam, while taking measurements will lift the base from the reference surface and will show wrong measurements.