1. Relates mostly to machining centers
G17, G18, & G19
plane selection
Relates mostly to machining centers
(unless turning center has live tooling)

2. You commonly work in XY plane G17 (XY plane) is initialized
G17, G18, & G19 – plane selection commands
Commonly taught in basic CNC courses:
O0001
N005 G17 G20 G23
N010 G40 G50 G64
N015 G67 G69 G80
Example:
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
Confirm initialized state

3. You commonly work in XY plane G17 (XY plane) is initialized
G17, G18, & G19 – plane selection commands
Commonly taught in basic CNC courses:
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
Not always taught in basic courses:
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers

4. You commonly work in XY plane G17 (XY plane) is initialized
G17, G18, & G19 – plane selection commands
Commonly taught in basic CNC courses:
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
Not always taught in basic courses:
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers

5. The spindle faces the XY plane
G17, G18, & G19 – plane selection commands
Plane selection with right angle heads
Commonly taught in basic CNC courses:
The spindle faces the XY plane
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
XY plane
Not always taught in basic courses:
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers

6. There are two other standard planes
G17, G18, & G19 – plane selection commands
Plane selection with right angle heads
Commonly taught in basic CNC courses:
There are two other standard planes
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
XZ plane
Not always taught in basic courses:
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers
G18

7. There are two other standard planes
G17, G18, & G19 – plane selection commands
Plane selection with right angle heads
Commonly taught in basic CNC courses:
There are two other standard planes
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
YZ plane
Not always taught in basic courses:
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers
G19

8. Tool is pointing to YZ Plane (G19)
G17, G18, & G19 – plane selection commands
Plane selection with right angle heads
Do you use right angle heads?
Commonly taught in basic CNC courses:
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
There is a lengthy discussion in the lesson text about programming right angle heads X+ Z+
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers
Tool is pointing to YZ Plane (G19)

9. You commonly work in XY plane G17 (XY plane) is initialized
G17, G18, & G19 – plane selection commands
Commonly taught in basic CNC courses:
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
Not always taught in basic courses:
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers

10. You commonly work in XY plane G17 (XY plane) is initialized
G17, G18, & G19 – plane selection commands
Commonly taught in basic CNC courses:
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
Not always taught in basic courses:
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers

11. G18 G02! Circular milling with a ball end mill
G17, G18, & G19 – plane selection commands
Other times you need plane selection
Commonly taught in basic CNC courses:
Circular milling with a ball end mill
If circular milling in XZ, use G18
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection X Z
If circular milling in YZ, use G19
G02!
G18
Not always taught in basic courses:
Remember how G02 and G03 are evaluated….
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers
…look at the circular motion from the plus side of the uninvolved axis

12. You commonly work in XY plane G17 (XY plane) is initialized
G17, G18, & G19 – plane selection commands
Commonly taught in basic CNC courses:
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
Not always taught in basic courses:
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers

13. You commonly work in XY plane G17 (XY plane) is initialized
G17, G18, & G19 – plane selection commands
Commonly taught in basic CNC courses:
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
Not always taught in basic courses:
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers

14. You never have to worry about plane selection!
G17, G18, & G19 – plane selection commands
Plane selection on turning centers
If you have a two axis turning center…
Commonly taught in basic CNC courses:
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
…since G18 (XZ plane) is initialized
You never have to worry about plane selection!
Not always taught in basic courses:
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers
But…

15. Do you have a turning center with live tooling?
G17, G18, & G19 – plane selection commands
Plane selection on turning centers
Commonly taught in basic CNC courses:
Do you have a turning center with live tooling?
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
…Does it have a C axis?
All points made about plane selection on machining centers apply!
Not always taught in basic courses:
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers

16. You commonly work in XY plane G17 (XY plane) is initialized
G17, G18, & G19 – plane selection commands
Commonly taught in basic CNC courses:
You commonly work in XY plane
G17 (XY plane) is initialized
No need to worry about plane selection
Not always taught in basic courses:
Plane selection with right angle heads
Other times you need plane selection
Plane selection on turning centers