Exp.4: Angle Measurements Eng. Reem Mohanna Exp.4 : Angle Measurements 29/12/1439

Objectives 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 Exp.4 : Angle Measurements 29/12/1439

Block Gauges 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. Exp.4 : Angle Measurements 29/12/1439

Block Gauges 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. Exp.4 : Angle Measurements 29/12/1439

Gauge blocks groups Numbers of blocks Blocks Lengths Increasing of each block (mm) 1 0.5 10 1.000- 1.009 0.001 49 1.01- 1.049 0.01 17 1.5- 9.5 10 - 100 Exp.4 : Angle Measurements 29/12/1439

How to select gauge blocks for an application 5.324 -1.004 = 4.320 -1.32= 3.000 - 3.000 = 0.000 Exp.4 : Angle Measurements 29/12/1439

Sine bars 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) Exp.4 : Angle Measurements 29/12/1439

Sine bars Exp.4 : Angle Measurements 29/12/1439

Combination Set It is used as a rule, a square, a miter, a depth gage, a height gage, and a level. Exp.4 : Angle Measurements 29/12/1439

Combination Set Applications 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. Exp.4 : Angle Measurements 29/12/1439

Combination square 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. Exp.4 : Angle Measurements 29/12/1439

Protractors 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 Exp.4 : Angle Measurements 29/12/1439

Examples The reading is 46° - 20' Exp.4 : Angle Measurements 29/12/1439