Chapter 87, Problem 27A

Write a CNC G-code program to machine the part in the following figure, so that the tip of the tool follows this path:

• rapid movement to a point above P8, with $z=4$ . using absolute dimensioning
  change to tool "4, with a clockwise spindle speed of 2500 rpm, with coolant on and a feed rate of 14 in./min
• using incremental dimensioning
-rapid movement to 4 in. above P1
-rapid movement to lower the tool to be 0.1 in. above the top surface of the part
-move the tool to be 0.5 in. below the top at a 14 in./min feed rate
-follow the path around the perimeter to points P2 through PI, ending at P1, using the 14in„/min feed rate
• turn off the spindle and coolant
• use absolute dimensioning to return to the start point
• end the program