= 29☄0' Where ° indicates degrees and ' indicates minutesĬorresponding to Theta (θ)Approx., built the angle gauges and keep it below the optical head and switch on the optical head because of an incident ray of light and reflected ray of light, the scales are observed to be distributed completely which is shown in the figure.īy using the knobs, adjust the scales in such a way that both the scales will be coming to the center of each other. and calculate approximately the angle of the given component. It is not the direct angle measuring equipment but it is an angle comparator that compares the angle of the given component with a standard set of masterpieces which can also be taken as Angle gauges.īy using any linear measuring equipment, measure the linear dimension of a component like h1, h2, L.etc. This can measure the accuracy of the angles up to 0.5 degrees and any unknown projections present in the component will also create errors in the angle measured. It is a piece of simple angular measuring equipment used for measuring an approximate angle of the component. Therefore by combining protractor and spirit levels, it is possible to measure the angle of the component which is called a Clinometer. Individually, Protractor and Spirit Level cannot be used for the measurement of angles of a component. If the sensitivity of the spirit level is indicated in terms of mm/m, it is called a gradient of a spirit level. The sensitivity of the spirit level can be increased by increasing the radius of the glass vial. The air bubble is always set at the topmost point of the curvature so that when the spirit level is placed on the perfectly flat surface, the air bubble is setting at the Zero location.To ensure that only one division must be present within the air bubble. The length of one scale division must be greater than the diameter of the air bubble.Spirit is used as a liquid because it has low density or viscosity and the wettability of spirit with a glass surface is zero. The body of the spirit level is made by using very low-density material because the weight of the spirit level must be as minimum as possible to avoid the disturbance taking place on the angular deviations. In general, the spirit level will not be used for measurement of the angles, but it will be used for the measurement of angular deviations or angular errors only. When 2 slip gauges are given, it is possible to build only 1 dimension whereas when 2 angle gauges are given, it is possible to build 2 different angles.Īngle gauges are used as a reference gauge or masterpieces for calibrating the angular measuring equipment.
Do not repeat the same Angle gauge in one setting.Every single gauge used must be available in the standard set.There are 13 Angle Gauges from 0 degree to 81 degrees.ĭuring the building of a given angle by using an angle gauge set, the following points must be ensured. This is generally used for measurement and setting of angles in drawings only.įor more info Principle, Formula, Construction, Limitations & Factors of Sine bar, Click here.
It is a piece of simple angular measuring equipment used for measurement of angles from zero degrees to 180 degrees with an accuracy of + or -0.5 degree. The basic difference between them is, the protractor is used to measure the angle of the flat surfaces whereas the bevel protractor is used to measure the angles of inclined surfaces. The explanation of Protractor and Bevel Protractor is as follows. The explanation of the above Angular Measurements is as follows.
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