Dial gauge

Dial gauges are linear measurement instruments

1. DIAL GAUGE PRESENTED BY R.S.MUKESH KUMAR III RD YEAR MECHANICAL ENGINEERING

2. MEANING OF DIAL GAUGE/ DIAL INDICATOR Dial indicators are important devices used in manufacturing and metal engineering among others. These devices measure small linear distances that are important in the establishment of precision and accuracy.

3. MAIN COMPONENTS OF DIAL GAUGE Circular dial body Round graduated dial Pointer Gear train Lever Plunger

4. Types of dial indicators Several different types of dial indicators exist, differentiated by factors such as their size, connection method and the type of information featured on their face

5. 1.Balanced reading dial indicators 2. Continuous Dial Indicators 3. Reversed Balanced Dial Indicators 4.Reversed Continuous Dial Indicators 5. Test Dial Indicators 6. Plunger Dial Indicator 7. Lever Dial Indicator

6. Balanced reading dial indicators Balanced reading dial indicators are so named for the way that information is arranged upon the dial's face. Figures are printed upon the face of this dial running in two directions, starting from a zero in the center. Often, positive numbers are featured to the right of the zero and negative numbers to the left.

7. 2. Continuous Dial Indicators Continuously numbered dial indicators do not have the two sets of numbers featured on balanced reading dial indicators. The figures on this type of dial indicators run in one direction without stopping and without any type of a separation .

8. 3.Reversed Balanced Dial Indicators Reversed Balanced Dial Indicators are named because they have the same basic positive and negative scales to each side of a zero, but the positive numbers are to the left and the negative are to the right.

9. 4.Reversed Continuous Dial Indicators Reversed continuous, or counter-clockwise, dial indicators are the same as continuous dial indicators except that the numbers run in the opposite direction.

10. 5.Plunger Dial Indicator Plunger Dial Indicator also have a clock-like face but are characterized by the plungers mounted on one of their sides. One common use for plunger dial indicators is to measure the work of injection molding machines. The mechanism which allows this type of dial indicator to work is a rack and pinion, which changes the linear thrust of the plunger into rotary motion for the dial.

11. 6.Lever Dial Indicator Lever Dial Indicator are characterized by their lever and scroll mechanisms, which cause the stylus to move. This type of dial indicators are more compact and easier to use than plunger-type dial indicators and are therefore quite often used.

12. APPLICATION 1 . Comparing two heights or distances between narrow limits. 2. To determine the errors in geometrical form such as ovality , roundness and taper. 3. For taking accurate measurement of deformation such as intension and compression.

13. 4. To determine positional errors of surfaces such as parallelism, squareness and alignment. 5. To check the alignment of lathe centers by using suitable accurate bar between the centers. 6. To check trueness of milling machine arbours and to check the parallelism of shaper arm with table surface or vice.

14. Advantages 1.The instrument can be easily used and read even by unskilled worker 2. Contact pressure is low and uniform 3. The instrument is accurate and economical 4. It is easy to handle and can be set very quickly

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