Vernier Height Gauge | Construction | Advantages and Disadvantages

Vernier Height Gauge | Construction |  Least Count , Parts 

Vernier height gauge is similar to vernier caliper but in this instrument the graduated
bar is held in a vertical position and it is used in conjunction with a surface plate

Construction of Vernier height Gauge:
A vernier height gauge consists of
(i) a finely grow and lapped base. The base is massive and robust in construction to ensure rigidity and stability.
(ii) A vertical graduated beam or column supported on a massive base.
(iii) Attached to the beam is a sliding vernier head carrying the vernier scale and a clamping screw.
(iv) An auxiliary head which is also attached to the beam above sliding vernier head. It has fine adjusting and clamping screw.
(v) A measuring jaw or a scriber attached to the front of sliding vernier.

Diagram Of Vernier Height Gauge
Diagram Of Vernier Height Gauge
Use: The vernier height gauge is designed for accurate measurement and marking of vertical height above a surface plate datum. It can also be used to measure differences in heights by taking the vernier scale reading t each height and determining the difference by substraction. It can be used for number of applications in tool room and inspection department.

Specification Of Vernier Height Gauge:
Digital Height Gauge - Model xxxx/xxxx
Range :- 0 to 300mm 
0 to 600mm 
Least Count - 0.01mm/0.0005"

The important features of vernier height gauge are :
  • all the parts are made of good quality steel or stainless steel.
  • The beam should be sufficiently rigid and square with the base.
  • The measuring jaw should have a clear protection from the edge of the beam at least equal to the projection of the base from the beam.
  • The upper and lower ganging surfaces of the measuring jaw shall be flat and parallel to the base.
  • The scriber should also be of same nominal depth as measuring jaw so that it may be reversed.
  • The projection of the jaw should be at least 25 mm.
  • The slider should have a good sliding fit for all along the full worship length of the beam.
  • Height gauge can also be provided with dial gauge instead of vernier. This provides easy and exact reading of slider movement by dial gauge which is larger and clear.
Advantages of using a vernier caliper include:
  • It can be used in different ways: one set of jaws can be used to determine inner measurements, while the other set can be used to measure exterior measurements.
  • It is the simplest and quickest of the vernier instruments to use, and it is also quite cheap.
The disadvantages of using a vernier caliper include:
  • The main disadvantage is that the readings are highly dependent on the operators ability, and its accuracy is limited by the vernier scale.
  • It can only be used to measure small objects.

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