Angle Measurements

Exp.4

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Objectives

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To be familiar with the tools used for angle measurement.

To know how to use the block gauges to measure angles and to calibrate measuring tools.

To learn how to measure angles using different methods

Block Gauges

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Gauge blocks are a necessity in any testing environment that requires linear dimensional accuracy and/or calibration of measuring tools, such as micrometers and calipers.

Each block is engraved with an individual serial number and the size of the gauge for calibration purposes.

The purpose of gauge blocks is to provide linear dimensions known to within a given tolerance.

Block Gauges

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The requirements of gauge blocks are, The actual size must be known The faces must be parallel The surface must have a smooth finish The surfaces must be flat

The materials gauge blocks are made from are selected for, hardness, temperature stability, corrosion resistance, and high quality finish.

Gauge blocks groups

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Increasing of each block (mm( Blocks Lengths Numbers of blocks

0 .5 1

0.001 1.000- 1.009 10

0.01 1.01- 1.049 49

0.5 1.5- 9.5 17

10 10 - 100 10

How to select gauge blocks for an application

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5.324

-1.004 = 4.320

-1.32= 3.000

- 3.000 = 0.000

Sine bars

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A sine bar is a tool used to measure angles in metalworking.

It consists of a hardened, precision ground body with two precision ground cylinders fixed at each end, the rollers are positioned at a precise distance and the top of the bar is parallel to the center line of the rollers.

The dimension between the two rollers is chosen to be a whole number (for ease of later calculations)

Sine bars

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Combination Set

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It is used as a rule, a square, a miter, a depth gage, a height gage, and a level.

Combination Set Applications

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Measuring angles 90° and 45° angles. Determining flatness Measuring the center of a circular bar. Protractor head allows angles to be set and measured

between the base and ruler. A rudimentary level for approximating level surfaces is

incorporated in the protractor and also the 45° holder.

USING A COMBINATION SQUARE

USING A COMBINATION SQUARE

Using   as   a   center   head   to   find   the   diameter   of   a

cylinder

Using as a protractor head to determine an angle 1. 3.

2. 4.

Combination square

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A Combination Square consisting of the ruler, 45° holder, protractor and center square.

Marking the work surface; with the included Scribe Point stored in a drilled hole in the Square Base.

Protractors

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Plate Protractor: capable of measuring to within 1-degree

Protractor heads: have revolving turrets with direct-reading double

graduations, 0-180 degrees in opposite directions. Bevel protractor :Made to high quality standards it’s an angle

measurement tool reads to 5 minutes

Square Head: 45 and 90 degree

Center Head : V- shape for centering

Examples

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The reading is 46° - 20‘

Your Report

Your report should have a lot of details about angle measurement tools (List the parts and the function of each part).