Uses of vernier bevel protractor

 Parts of a universal bevel protractor

. parts of a universal bevel protractor

. the function of each  part

.the uses of a vernier bevel  protractor

The vernier bevel protractor is a precision instrument meant for measuring angles precisely to an accuracy of 5 minutes(5').

Parts of vernier bevel protractor

Stock

This is one of the contacting surfaces during the measurement of an angle. Preferably it should be kept in contact with the surface from which the inclination is measured.

Disc

The disc is an intergrated part of the stock. It is circular in shape, and the edge is graduted in degrees.

Dial

It is pivoted to the disc and can be rotated through 360 drgree. The vernier scale of the instrument is attached to the dial. The dial is locked to the disc during reading the measurement.

Blade

This is  the other contacting surface of the instrument that contact the work during measurement, preferably the inclined surfaces. It is fixed to the dial with the help  of the clamping lever. A parallel groove is provided in the centre of the blade to enable it to be longitudinally positioned whenever necessary.

Locking screws

Two knurled locking screw are provided, one to lock the dial to the disc,and the other to lock the blade to the dial.

All parts are made of good quality alloy steel, properly heat-treated and highly finished. A magnifying glass is sometimes fitted for clear reading of the graduations.

Uses of vernier bevel protractor

The vernier bevel protractor is used to measure acute angels, i. e. Less than 90degree obtuse angles i.e more than 90 degree for setting Work-holding devices to angles on machine tools, work table etc.