From the course: G-Code Programming for CNC Foundations
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Safety block - G-Code Tutorial
From the course: G-Code Programming for CNC Foundations
Safety block
- [Instructor] In this movie we're going to be talking about a safety block. Now a safety block is generally in the beginning of a program, and it generally turns everything off and sets it back to its initial values. Now, we talked about earlier our modal commands. So some things will stay active unless you change them to something else. In the same respect, if you turn them on, they will stay on until you turn them off. Now generally the safety block is trying to set the machine back to its original conditions, so when you write your program or it reads through your program, it's not getting any surprises. So let me show you what's involved in that safety block. So right over here you can see it starts off with a G90 command, which is switching back to an absolute coordinate system. We don't want to be using incrementals. This program or a previous program might have left the machine in a G91 state, and we generally don't want to stay in G91, so we want to switch back to a G90…
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