Removal of damaged fasteners NSQF LEVEL 4 - Unit 2 - Session-5

 Removal of Damaged Fasteners and Replacement

Removal of broken/spoiled headed screw In automobile, 

Source: nykyho82

due to jerk, vibration and corrosion screws get broken. It ultimate it leads to dislocate the assembly. It is necessary that it should be removed and replaced. Similarly improper uses of screw drivers with its snap head, screw head get spoiled. It becomes difficult to tight, loosen and removal of screw from the assembly.

Method of removal of damaged screw Case

1: Removal of spoiled headed screw

Source:Pinterest

• If the screw driver slips, due to widening of groove/screw way

• Use hacksaw blade and dress the groove

• Now use screw driver of thick snap and turn anticlockwise

• This removes the screw, if it is not responded

• Take a prick punch and hammer. 

• Now drill it at the centre of screw, now 100% screw will be removed Case

2: Removal of unheaded screw

• If the screw is broken at the top of the assembly

• Remove the other screw and separate the assembly •

 Hold the jaws of the cripper on broken screw

• Lock the cripper and turn anti clock wise

• Screw may come out

3: Removal of unheaded screw broken in the assembly

• Use drill machine of drill bit smaller than size of screw

• Now drill it at the centre of screw, now 100% screw will be removed

• Now dress the threads before fixing new screw

 

  

Method of removal of Broken/ spoiled threaded studs Case

1: Removal of spoiled threaded studs

• To remove spoiled threaded stud, give gentle pressure on assembly by using screw driver, this will lift the spoiled portion of the stud threads upward.

 • Turn the nut in anticlockwise, turn the stud assembly and gentle press the screw driver inside so that stud will come out

• In case, if the nut threads internal threads of the nut/external threads of the studs are spoiled, then give welding spot to nut and stud. Now turn assembly anti clockwise. Now stud will come out Case

2: Removal of broken studs above the casing

• If the stud is broken above the assembly unit,

• Separate the assembly by removing other nuts

• Fix stud extractor on the broken stud and lock it

• Now turn stud extractor slowly, the stud will be driven out

Case 3: Removal of broken studs inside the casing

• Take a prick punch and hammer at the face of broken stud.

 Give light blow in anti clock wise direction. This will loosen the remaining portion of the stud.

• If it does not work then use drill machine of drill bit smaller than size of stud

• Now drill it at the centre of stud, Remove the burr from the casing

• Use appropriate tap and redress the internal thread

• Fix the new stud by using stud extractor.