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PRINCIPLE OF DRILLING MACHINE

PRINCIPLE OF DRILLING MACHINE 

DRILLING
DRILLING MACHINE IS ONE OF THE MOST IMPORTANT MACHINE TOOLS IN A WORKSHOP. IT WAS DESIGNED TO PRODUCE A CYLINDRICAL HOLE OF REQUIRED DIAMETER AND DEPTH ON METAL WORK PIECES.  THOUGH HOLES CAN BE MADE BY DIFFERENT MACHINE TOOLS IN A SHOP, DRILLING MACHINE IS DESIGNED SPECIFICALLY TO PERFORM THE OPERATION OF DRILLING AND SIMILAR OPERATIONS. DRILLING CAN BE DONE EASILY AT A LOW COST IN A SHORTER PERIOD OF TIME IN A DRILLING MACHINE. DRILLING CAN BE CALLED AS THE OPERATION OF PRODUCING A CYLINDRICAL HOLE OF REQUIRED DIAMETER AND DEPTH BY REMOVING METAL BY THE ROTATING EDGES OF A DRILL. THE CUTTING TOOL KNOWN AS DRILL IS FITTED INTO THE SPINDLE OF THE DRILLING MACHINE. A MARK OF INDENTATION IS MADE AT THE REQUIRED LOCATION WITH A CENTER PUNCH. THE ROTATING DRILL IS PRESSED AT THE LOCATION AND IS FED INTO THE WORK. THE HOLE CAN BE MADE UP TO A REQUIRED DEPTH. 

GROOVING
GROOVING IS THE PROCESS OF CUTTING A NARROW GROOVE ON THE CYLINDRICAL SURFACE OF THE WORK PIECE. IT IS OFTEN DONE AT END OF A THREAD OR ADJACENT TO A SHOULDER TO LEAVE A SMALL MARGIN. THE GROOVE MAY BE SQUARE, RADIAL OR BEVELED IN SHAPE.
  
UNDERCUTTING
UNDERCUTTING IS DONE
     ·         AT THE END OF A HOLE
     ·         NEAR THE SHOULDER OF STEPPED CYLINDRICAL SURFACES
     ·         AT THE END OF THE THREADED PORTION IN BOLTS

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IT IS A PROCESS OF ENLARGING THE DIAMETER IF DONE INTERNALLY AND REDUCING THE DIAMETER IF DONE EXTERNALLY OVER A SHORT LENGTH. IT IS USEFUL MAINLY TO MAKE FITS PERFECT. BORING TOOLS AND PARTING TOOLS ARE USED FOR THIS OPERATION.
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