Exp.4: Angle Measurements Eng. Ibrahim Kuhail Exp.4 : Angle Measurements 26/08/1440

Objectives To be familiar with the tools used for angle measurement. Exp.4 : Angle Measurements 26/08/1440 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 26/08/1440 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.

Block Gauges The requirements of gauge blocks are, Exp.4 : Angle Measurements 26/08/1440 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.

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 26/08/1440

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 26/08/1440

Sine bars A sine bar is a tool used to measure angles in metalworking. Exp.4 : Angle Measurements 26/08/1440 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)

Sine bars Exp.4 : Angle Measurements 26/08/1440

Exp.4 : Angle Measurements 26/08/1440 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 26/08/1440 Combination Set cont. 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.

Combination Set Applications Exp.4 : Angle Measurements 26/08/1440 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.

Protractors Plate Protractor: capable of measuring to within 1-degree Exp.4 : Angle Measurements 26/08/1440 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 The reading is 46° - 20' Exp.4 : Angle Measurements 26/08/1440 The reading is 46° - 20'