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

2. 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

3. 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

4. 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

5. Gauge blocks groups
Numbers of blocks
Blocks Lengths
Increasing of each block (mm) 1
0.5 10
0.001 49
0.01 17
Exp.4 : Angle Measurements
29/12/1439

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

7. 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

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

9. 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

10. 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

11. 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

12. Protractors Plate Protractor: capable of measuring to within 1-degree
Protractor heads: have revolving turrets with direct-reading double graduations, 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

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