Page 116 - CITS - Fitter Trade Pactical - Volume - 2

FITTER - CITS

5 Making drill hole
Correctly find out the centre of the broken stud and drill hole nearly equal to the core diameter of the stud down the
centre so that the threads only remain. Remove the thread portion by the point of a scriber in the form of broken
chips. Re - tap the drill the hole to clear the threads. (Fig 5)

Fig 5

6 Making Oversize hole
If all other method fail, drill a hole equal to the size of the stud size or a little over and tap the hole with an oversize
tap. Now a special over size stud as shown in Fig 6 is to be made and fitted in position

Fig 6

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CITS : CG & M - Fitter - Exercise 33 CITS : CG & M - Fitter - Exercise 33