Working Principle
Lower the internal cutter to a designated cutting depth,rotate (3 rounds) the cutter mandrel in the clockwise direction
to separate the sliding sleeve and the sliding sheet.At this instance,with the spring effect,the friction block will be pressed
against the pipe wall.In addition,due to the engagement of the sliding sleeve and sheet,the main center body and the
slip portion is pushed upwards along the tapered slip cone,expanding the slip diameter.As the slip diameter expands,
it bites on the internal wall of the drill pipe.At this moment,anchor the cutter on the pipe wall and lift the cutter mandrel
by 10mm.After which,slowly lower and rotate mandrel,as the cutters (3 pcs) move down the tapered cutter block,it open
up radially to cut the pipe wall.
The cutting operation is completed when the mandrel pressed against the end of the thrustring.Lift the mandrel to release
and reposition the cutters via its own weight and the function ofthe blade spring.As the mandrel is lifted,the sliding sleeve
and sheet re-engage back to its original position.In addition,as the tapered slip cone moves upwards,the slip loses its grip
on the pipe wall and the cutter releases its anchor on the wall.Continue to lift mandrel until the locating ring engages with
the guide nut before pulling the tool out.
