From the course: G-Code Programming for CNC Foundations

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G17, G18, and G19: Plane selection

G17, G18, and G19: Plane selection - G-Code Tutorial

From the course: G-Code Programming for CNC Foundations

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G17, G18, and G19: Plane selection

- [Instructor] In this movie, we're going to be looking at the different planes you can select for making circular arcs. Now by default most CNC machines turn on with a G17 or an XY plane selected. Now you can switch to a G18 or a G19 in your program and a lot of times programs will actually use this for a lead-in or lead-out moves for a CNC path. The problem you can end up with, though, is if you stop your program early and you used a G18 or a G19 in your program. Now the machine is still in that mode, right? It's going to stay in a modal state of G18 or G19, whichever plane you happen to be in. Now if you go and restart your program from the beginning, if you don't call a G17 in the beginning, by default the machine is going to be in whatever state it was in last. So you might start getting some very strange results. And this has definitely happened to me in the past. I've run a program, I had an error or some kind of thing that didn't work out correctly. I stopped the program. I…

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