Measuring tools

what is measuring tools ?

1. What is Tools ? A tool is an object used to perform work . The tools being referred to hand tools and power tools are a common part of our everyday lives and are present in nearly every industry. These tools help us to easily perform tasks that otherwise would be difficult or impossible. Bagerhat Technical School & College .

2. How Kinds of Tools  Classified into two categories : Hand (Manual) Tools Power Tools Bagerhat Technical School & College .

3. Hand Tools No external power required Broad range of tools from extremely simple to more complex, such as: HAMMER HACK SAW SPADE Bull float Bagerhat Technical School & College.

4. Classified of Hand tools  Measuring tools The very first activity involved in any operation  laying out tools Second activity involved in any operation  Holding tools Third activity involved in any operation  Cutting tools Finishing activity involved in any operation Bagerhat Technical School & College.

5. Measuring tools Measuring is the process of making Dimensions Required to the needed job before any other processes will be applied . Some Important measuring Tools : 1.Steel Ruler : The still rule is a Stiff Straight steel Strip having all the face machined true. On one of the faces graduation are marked in Inches and Centimeters It is use to set out Dimensions. Bagerhat Technical School & College.

6. Dividing of Steel ruler 12 '' = 1' Dividing of Steel ruler 10 mm = 1cm 0.5 1 cm 0 cm 1 mm Bagerhat Technical School & College.

7. Steel tape : It is made of steel and is used for linear measurement where standard rules are not long enough As it is rolled up in a very small housing it can be easily carried in a pocket it over all length 3(10 ft ) to 5 meters use usually. Bagerhat Technical School & College.

8. Tri square : A engineer's square (machinist square) is the metalworkers' equivalent of a try square.  Machinist try squares are made entirely from metal to guarantee accuracy. The engineers try - square imposed of two parts, the stock and the blade. They are usually made from bright mild steel with the blade being hardened. STOCK BLADE 90 

9. Combination Set: Bagerhat Technical School & College. A combination square is a tool used for multiple purposes in metalworking . It is composed of a ruled blade and one or more interchangeable heads that may be affixed to it . The most common head is the standard or square head which is used to lay out or check right and 45° angles .

10. Inside calipers : A caliper is a device used to measure the distance between two opposite sides of an object. A caliper can be as simple as a compass with inward or outward-facing points. The tips of the caliper are adjusted to fit across the points to be measured, the caliper is then removed and the distance read by measuring between the tips with a measuring tool, such as a ruler . It is used in many fields such as mechanical engineering , metalworking , woodworking , science . The inside calipers are used to measure the internal size of an object. Bagerhat Technical School & College.

11. Out side Calipers Outside calipers are used to measure the external size of an object. The same observations and technique apply to this type of caliper, as for the above inside caliper. With some understanding of their limitations and usage these instruments can provide a high degree of accuracy and repeatability. They are especially useful when measuring over very large distances, consider if the calipers are used to measure a large diameter pipe. A venire caliper does not have the depth capacity to straddle this large diameter while at the same time reach the outermost points of the pipe's diameter . Bagerhat Technical School & College.

12. Vernier caliper: The vernier, dial, and digital calipers give a direct reading of the distance measured with high accuracy and precision . They are functionally identical, with different ways of reading the result. These calipers comprise a calibrated scale with a fixed jaw, and another jaw, with a pointer, that slides along the scale. The distance between the jaws is then read in different ways for the three types . Dial caliper Digital caliper Bagerhat Technical School & College.

13. Vernier caliper Parts of a vernier caliper : Outside jaws: used to measure external diameter or width of an object Inside jaws: used to measure internal diameter of an object Depth probe: used to measure depths of an object or a hole Main scale: scale marked every mm Main scale : scale marked in inches and fractions Vernier scale : gives interpolated measurements to 0.1 mm or better Vernier scal e: gives interpolated measurements in fractions of an inch Retainer: used to block movable part to allow the easy transferring of a measurement Bagerhat Technical School & College.

14. NEXT LESSON Layout tools THANK YOU Bagerhat Technical School & College.