HOW TO MEASURE WITH A BORE DIAL GAUGE ?

NAME OF EXPERIMENT:   MEASURING WITH BORE DIAL GAUGE

TOOLS REQUIRED: Set gauge/screw gauge, bore dial gauge set, telescopic gauge/Vernier caliper.

MATERIALS REQUIRED: cotton waste, kerosene.

PROCEDURE

1.        Clean the cylinder bore to be measured.

2.       Measure the bore diameter with the help of telescopic gauge or Vernier caliper and note down the value.

3.       Make sure that,the reading shouldtake at the ridge of the cylinder bore.

4.       Fix the dial indicator into instrument.

5.       Adjust the revolution counter dial to zero by adjusting screw and lock the position.

6.       Select suitable size of anvil and washers ( the distance between the end of plunger and extreme end of fixed anvil should always just above the measured bore diameter).

7.       Copy the bore diameter value onto the set gauge or micrometre and set the bore dial gauge length as the diameter of the cylinder bore.

8.       At that position, set zero against the dial by adjusting the bezel of the dial test indicator and lock the position.

9.       Take out the dial test indicator.

10.   Insert the bore dial gauge into the bore.

11.   Made fixed anvil as the stationary point, rock the bore dial gauge.

12.   Note down the point at which, the dial will travel back (it may on the left or right side of the zero)

13.   Count down the graduation to/ from the zero

14.   If it is left side of the zero, add the value of graduations counted with the measured bore diameter.

15.   If it is right side of the zero, subtract the value of graduations counted from the measured bore diameter.

16.   Repeat the procedure 10 to 15 at different positions.

17.   Tabulate the values and take the average of final result of different sections.

TABULAR COLUMN

Sl. No.	Diameter of the cylinder bore	Bore dial gauge reading	Least count	Bore dial gauge reading value	Total reading	Final reading(average)
1
2
3
4

SAMPLE CALCULATION

Diameter of the cylinder bore=_______mm

Bore dial gauge reading value =0.01 x _____________=______mm

Total reading= Diameter of the cylinder bore ± bore dial gauge reading value

                         =______________________±____________________=mm

Final reading= average value of total reading at different sections

                          = (__________+_________+___________+___________)/4

  =_________mm

Wearness of the cylinder bore = Diameter of the cylinder bore - Final reading =________________-______________

                      

                      =__________mm

RESULT

Wearness of the cylinder bore = __________mm

Bore dial gauge