Angle measurements
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This document discusses tools for measuring angles, including block gauges, sine bars, combination sets, and protractors. Block gauges are made of materials that are hard, stable with temperature changes, resistant to corrosion, and have a smooth finish. Their parallel faces and precise dimensions make them useful for calibrating measurement tools and providing known lengths. Sine bars contain two precisely placed rollers used to measure angles in metalworking. Combination sets can measure common angles and be used as a square, level, and rule. Protractors can precisely measure angles to within one degree or five minutes and have rotating heads for direct reading in both directions.
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Angle measurements
- 1. Angle Measurements Exp.4 ١٤٣٦/٠٦/٢٥Exp.4 : Angle Measurements1
- 2. Objectives ١٤٣٦/٠٦/٢٥Exp.4 : Angle Measurements2 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
- 3. Block Gauges ١٤٣٦/٠٦/٢٥Exp.4 : Angle Measurements3 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.
- 4. Block Gauges ١٤٣٦/٠٦/٢٥Exp.4 : Angle Measurements4 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.
- 5. Gauge blocks groups ١٤٣٦/٠٦/٢٥Exp.4 : Angle Measurements5 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
- 6. How to select gauge blocks for an application ١٤٣٦/٠٦/٢٥Exp.4 : Angle Measurements6 5.324 -1.004 = 4.320 -1.32= 3.000 - 3.000 = 0.000
- 7. Sine bars ١٤٣٦/٠٦/٢٥Exp.4 : Angle Measurements7 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)
- 8. Sine bars ١٤٣٦/٠٦/٢٥Exp.4 : Angle Measurements8
- 9. Combination Set ١٤٣٦/٠٦/٢٥Exp.4 : Angle Measurements9 It is used as a rule, a square, a miter, a depth gage, a height gage, and a level.
- 10. Combination Set Applications ١٤٣٦/٠٦/٢٥Exp.4 : Angle Measurements10 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.
- 11. USING A COMBINATION SQUARE
- 12. USING A COMBINATION SQUARE Using as a center head to find the diameter of a cylinder
- 13. Using as a protractor head to determine an angle 1. 3. 2. 4.
- 14. Combination square ١٤٣٦/٠٦/٢٥Exp.4 : Angle Measurements14 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.
- 15. Protractors ١٤٣٦/٠٦/٢٥Exp.4 : Angle Measurements15 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
- 16. Examples ١٤٣٦/٠٦/٢٥Exp.4 : Angle Measurements16 The reading is 46° - 20‘
- 17. Your Report Your report should have a lot of details about angle measurement tools (List the parts and the function of each part).
Editor's Notes
- #13: 1.Slide center head (1) on rule (2) and fasten by tightening setscrew (3). 2. Put the center head flush against the cylinder. 3. Mark the diameter on the cylinder using a pencil or marking crayon by drawing a straight line along the inside edge (4). Make sure the square does not slip while marking.
- #14: 1.Slide protractor head (1) on rule (2) and fasten by tightening setscrew (3). 2. Loosen the protractor adjustment screws (4) so the protractor may be pivoted about the rule. Angle being measured is already marked . 3. Place the rule on the angle being measured and pivot the protractor head against the edge. 4. Remove and read measured angle on protractor scale.