Drilling

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COUNTERBORING AND SPOT FACING COUNTERBORING IS DONE TO PROVIDE RECESS FOR BOLT HEADS OR NUTS SPOT FACING IS DONE TO PROVIDE SEATING FOR WASHER BOTH OPERATIONS CAN BE DONE BY THE SAME TOOL
COUNTERSINKING Machined hole 82° Countersunk hole Flat head countersunk screw placed in hole
Page 1 and 2: DRILLING AND ALLIED OPERATIONS INTR
Page 3 and 4: DRILLING OPERATION Drill Workpiece
Page 5 and 6: CONDITIONS ON DRILLING MACHINE SPEE
Page 7 and 8: MRR IN DRILLING OPERATION MRR = (
Page 9 and 10: MACHINING TIME MACHINING TIME IS G
Page 11 and 12: BORING OPERATION Relative rotation
Page 13 and 14: REAMING CARRIED OUT TO MAKE THE HO
Page 15 and 16: To produce more accurate holes, the
Page 17 and 18: TAPPING PROCESS Tap Workpiece
Page 19: COUNTERBORING AND SPOT FACING Count
Page 23 and 24: EXAMPLES Example 6.1 A hole is bei
Page 25 and 26: EXAMPLES Example 6.3 A job shown i
Page 27 and 28: EXAMPLES Solution: For determining
Page 29 and 30: Time for Drilling: EXAMPLES Length
Page 31 and 32: EXAMPLES Alternate sequence of ope

Drilling

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