Page 71 - Turner 1st sem Practicals

Job Sequence

TASK 1 : Extractor method
• By using tap wrench/wrench turn in anticlockwise
• Note the condition/position of the broken tap.
direction.
• Study and try to insert the tap extractor leaves if
possible. (dont try to bend the leaves.) Using excessive torque on wrench will cause
leaves to twist while extracting the tap.
• After inserting to a possible depth in the flute gap, push
down the collar downwards for gripping. • If required lubricate and twist to extract the tap.

• Light blow over the extractor will release the tap from
threaded body.

TASK 2 : Punch and hammer method

• Use centre punch over the flute gap. • Like wise use all the flute gap to punch and rotate tap
in anticlockwise direction till it comes out to sufficient
• Light stroke on punch to turn the tap anticlockwise length to grip by plier/extractor.
direction.
While punching do not chip out the punch
which will clog inside and the broken tap will
jammed.

TASK 3 : Easy out method

• Heat the broken tap to red hot condition by blow lamp. • Check with a punch whether the tap has become soft.
• Light stroke on punch to turn the tap anticlockwise in • drill out tap portion to max drill dia. (for e.g. on M6 tap
the red hot condition, if it is not possible to remove the use 3.5 or 4 dia. drill).
broken tap, then cool down by annealing it.
• The rest of the portion to be removed either by drift or by
extractor.

Producltion & Manufacturing : Turner - Exercise 1.2.21 59