Numerical Control Programming
Chapter 3
Programming: Making N/C Do What You Want

Review Questions

  1. Codes that begin with the address word G are used for __________ functions.
  2. Codes that begin with the address word M are used for __________ functions.
  3. How does the programmer let the controller know that the end of the program has been reached and to rewind the memory or tape?
  4. How does the programmer tell the controller to pause for repositioning of the workpiece?
  5. How does the programmer tell the controller to stop for a change of tools?
  6. How does the programmer tell the controller to turn on the spray mist coolant?
  7. How does the programmer tell the controller to turn on the flood coolant?
  8. How does the programmer tell the controller to turn on the spindle in a clockwise direction?
  9. Describe the difference in function between the G00, G01, G02, and G03 preparatory functions.
  10. Describe the difference in function between the G70 and G71 preparatory functions.
  11. Describe the difference in function between the G90 and G91 preparatory functions.
  12. Describe the purpose for the G80 preparatory function.
  13. Describe the function of the G92 preparatory function.
  14. What is an arc center offset?
  15. What purpose do the I and J commands serve?
  16. What determines the numerical value of the I and J commands?
  17. What kinds of data must a controller be furnished if, instead of using I and J commands, an R command is used to indicate an arc cut's radius?
  18. Except when using a controller that accepts R radius commands, under what conditions can an I or J be omitted when programming an arc path?
  19. What is the number 1 enemy of cutting tool life?
  20. List the three major factors that must be considered in determining spindle speed.
  21. What can happen to a cutting tool if its threshold temperature is exceeded?
  22. List the cutting velocity for the more commonly encountered workpiece materials.
  23. What spindle speed should be used for milling a slot in soft (annealed) medium carbon steel using a 3/8-inch-diameter HSS end mill?
  24. What spindle speed should be used to drill a 1/2-inch-diameter hole in a piece of workhardened brass?
  25. What should the feedrate be for a 1/2 inch-deep milling cut in mild steel, using a 3/4-inch 2-flute HSS end mill in an N/C mill that has a 7.5 HP spindle? What would the resultant chip load be?

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Updated Jan. 9, 2002
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