The F and A variables assign a value to variable #9 and # 1, respectively. F is the 9th letter in the alphabet, and A is the first. When you have a value passed through on the G65 line, it can be used for ANYTHING in the sub-programs, like X#9 or G#9. In your case F is used to pass a value for feedrate (F#9) and A is used to pass a value for another feedrate (F#1).


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. I actually learn quite a lot from you. I have always been more hands on along with picking things up quickly and retaining it. However I never retained the proper verbiage of things. So I usually sound like an idiot when talking about a topic to say a “teacher” but I always knew what I was talking about (if that makes any sense). Basically I could never tell you why we had to do something a particular way but I knew that we had to.