Hight Gauge parts name &How to Read a Height Gauge

A Vernier height gauge is a precision instrument used to measure the depth of holes, the height of work, recesses, slots, and steps with an accuracy of 0.02 mm.
Parts of Vernier Height Gauge:
Following are the main parts of vernier height gauge:
Base
Beam
Measuring jaw and Scriber
Graduations
Slider
1. Base
The base is made to high propo
rtions to ensure rigidity and stability of the gauge. The underside of the base is relieved leaving a surface round the outside edge of at least 7mm width and an air gap is provided across the surface to connect the received part with the outside. It is lapped to an accuracy of 0.005mm as measured over the total span of the surface considered.
2. Beam
To ensure rigidity during use, the cross-section is chosen. The rigidity should be such that an upward force of 1kg applied at the tip of the scriber when the measuring jaw is in its highest position such that there is no change in the parallelism of the jaw with the base of more than 0.005mm / 10mm of projection of the working surface of the scriber.
Measuring Jaw and Scriber
The projection of the measuring jaw from the edge of the beam should be at least equal to the projection of the base from the beam.
For any position of the slider, the upper and lower gauging surfaces of the measuring jaw should be flat and parallel to the base within 0.008 mm.
The projection of a scriber beyond the jaw should be at least 25mm. Height gauges may have an offset scriber and the scale on the beam so positioned that when the scriber is coplanar with the base, the vernier is at zero position.
4. Graduations
All graduations on the scale and the vernier should be clearly engraved and the thickness of graduation both on scale and vernier should be identical and should be in between 0.05mm and 0.1mm.
Slider
It should have a good sliding fit along the full working length of the bema. A proper fitting is included to give a precise adjustment of the slider and suitable clamp fitted so that the slider can be effectively clamped to the beam after the final adjustment has been made.
Precautions in Using Height Gauge
The following are the most important precautions to be taken without fail:
Whenever the vernier height gauge is not used, it should be kept in their cases.
In long height gauges, to avoid its heating by warmth from the hands, care should be taken.
The springing of the measuring jaw should be always avoided.
Vernier Height Gauge Tests for Accuracy
For testing the accuracy of the vernier height gauge, the following conditions must be adopted:
The standard reference temperature of 20°C shall be maintained in the room, wherever the test is being conducted.
By resting the height gauge on precision surface plate various tests are being carried out.
At a distance of 25 mm from the end of the jaw, the test measurements are made.
Standard gauges are used for testing purpose.
The errors in any portion within the measuring range of height gauge should not exceed ±0.02mm for 250mm height gauge, I0.04 mm for above 250mm and up to 750mm, I0.05mm for large more than 750mm.
The major tests on vernier height gauge are straightness, squareness, the parallelism of the working faces of the beam, measuring jaw and scriber and the accuracy of the scale readings are done by following methods.
The hardness of working faces
Flatness of base
Rigidity of beam
Flatness and squareness of beam
The flatness of the working surface
The parallelism of the measuring jaw and scriber with the base
Thickness of graduation
Accuracy

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