1. Relates only to machining centers & turning centers with live tooling

2. Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80 N255 G54 G90 S2000 M03 T02 N260 G00 X1.0 Y1.0 N265 G43 H01 Z0.1 N270 G81 R0.1 Z-0.15 F4.0 Example: Drilling command

3. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80

4. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80

5. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80 G73-G89 – hole machining canned cycles There are two important cycle-time- related parameters you should know G73 – chip-break peck drilling: Rapid to R plane

6. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80 G73-G89 – hole machining canned cycles There are two important cycle-time- related parameters you should know G73 – chip-break peck drilling: Feed the peck amount (Q)

7. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80 G73-G89 – hole machining canned cycles There are two important cycle-time- related parameters you should know G73 – chip-break peck drilling: Back up slightly to break chip Set by parameter

8. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80 G73-G89 – hole machining canned cycles There are two important cycle-time- related parameters you should know G83 – deep-hole peck drilling: Rapid to R plane

9. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80 G73-G89 – hole machining canned cycles There are two important cycle-time- related parameters you should know G83 – deep-hole peck drilling: Feed peck amount (Q)

10. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80 G73-G89 – hole machining canned cycles There are two important cycle-time- related parameters you should know G83 – deep-hole peck drilling: Retract to clear chips

11. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80 G73-G89 – hole machining canned cycles There are two important cycle-time- related parameters you should know G83 – deep-hole peck drilling: Rapid back into hole Set by parameter

12. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80

13. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80

14. 395 Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode16 Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80 G73-G89 – hole machining canned cycles Do you need to clear obstructions? You know that G98 and G99 let you avoid obstructions in Z Understanding how L0 works lets you clear them in XY Consider this program… O0001 N005 T01 M06 N010 G54 G90 S2000 M03 T02 N015 G00 X1.0 Y1.0 N020 G43 H01 Z0.1 N025 G81 R0.1 Z-0.15 F4.0 N030 X2.0 N035 X3.0 N040 Y2.0 L0 N045 X5.0 L0 N050 Y1.0 N055 X6.0 N060 G80 N065 G91 G28 Z0 M19 N070 M01. Machine first three holes Clear obstruction Machine fourth & fifth holes In essence, L0 is saying “Don’t machine a hole in this command”

15. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80

16. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80

17. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80 G73-G89 – hole machining canned cycles Incremental mode can help you machine evenly spaced holes The meanings of X, Y, R, and Z change in the incremental mode X&Y – distance to hole to be machined R – distance from current Z position to R plane Z – distance from R plane to hole bottom O0001 N005 T01 M06 N010 G54 G90 S2000 M03 T02 N015 G00 X0 Y1.0 N020 G43 H01 Z0.1 N025 G91 G81 X1.0 R0 Z-0.25 F4.0 L10 N030 G80 N035 G91 G28 Z0 M19 N040 M01. N400 M30 Move one inch to the left of left-most hole Machine all ten holes! Another example (with drawing) is shown in the lesson text

18. Not always taught in basic courses: áRelated parameters áL0 with canned cycles áCanned cycles in incremental mode Commonly taught in basic CNC courses: G73-G89 – hole machining canned cycles 3Dramatically simplifies hole machining 3One command per hole 3Canned cycles are cancelled by G80