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Metrology / Measure

Instrument Recognition

TermDefinition
Vernier Calliper Measures diameter, thickness, internal diameters and dept of a hole. It reads to an accuracy of 0.02mm.
Micrometer Measures diameter of round bar. It reads to an accuracy of 0.01mm.
Height Gauge Used to scribe parallel horizontal lines onto a work-piece. It reads to an accuracy of 0.02mm.
Surface plate Used as a working surface for measuring instruments such as the height gauge. It is a flat surface
Angle Block Used on a surface plate to hold a work-piece vertical so it may be marked out accurately.
Feeler Gauge Used to measure a very small gap or space such as a spark plug in an engine.
V Block It will clamp round bar and tube for marking out and drilling
Radius gauge It will measure the size of a curve on the edge of a machined workpiece.
Gap Gauge Used to measure an external diameter or material thickness. It has a 'GO' and a 'NOT GO' measurement system
Plug Gauge Used to measure the diameter of a hole. It has a 'GO' and a 'NOT GO' measurement system
Telescopic gauge It is spring loaded to adjust and match a gap or an internal diameter, and then can then be locked. The size of the gap in the work is calculated by measuring the gauge with a vernier.
Dial Gauge It has a spring loaded 'Stylus' which will follow a surface. It may be used with a Sine bar to level a work-piece, or to center a work-piece in a four Jaw Chuck.
Precision Spheres They look like ball bearings. They are used to calculate the angle of an internal taper by using trigonometry
Slip Gauges They are blocks of precision ground steel which are joined by a process called 'Wringing'. They can be used with a sine bar and precision rollers to calculate angles
Precision Rollers These can be used with a sine bar to measure an angle or just with slip gauges to measure the angle on an external taper
Sine Bar Used to measure an angle with trigonometry. It will measure an angle to the nearest 'minute'. It can also be used to accurately set up a work-piece on a milling machine to machine an angle.
Scribing Block Used to scribe parallel horizontal lines onto a work-piece. Its height has to be set with a ruler. It is used on the surface plate.
Key Seat Rule A length of angle used to position a line on the circumference of a round bar, 90 degrees to the end of a bar.
Centre Square Is used with a scriber to locate the centre of a round bar. Two lines are marked on, where they intersect will be the centre of the bar.
Created by: Engineeringmcs
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