Slot true position

[JamesMannes]

Can the friendly folks of the forum help me out?
Can you give a concise explanation of the slot true position call out I am showing below? I have looked at ASME Y14.5-1994 (5.10.1) and am not sure if and how I would apply this to my situation. Firstly, my call out does not explicitly state the word BOUNDARY as the example in Y14.5 does and secondly I am not understanding what I'm reading.
I should also say that I think I would just call the span from the slot from the abc alignment and be done with it but how does the /m/ come into play in a span? Or do I call this out as a TP?
Does anyone have an answer for me? Thanks

[Matthew D. Hoedeman]

This is yet another case of someone making a print that has NO understanding of GD&T. I would simply report the single axis in the TP along with the length of the slot using MMC. Since it is part of your alignment, one axis will ALWAYS have a deviation of ZERO, so the slot can only move in the same direction as it's length. So, calling X side to side and Y top to bottom as you look at that print, do a TP dimension of X only, use NO datums (it is the C of the ABC alignment) and use the LF instead of the DF for the size. Basically, they want the slot ZERO in Y (it's location direction) and it can only move +/-0.125 in X (or TP of 0.25).

[JamesMannes]

Thanks a bunch Matt. That's pretty much what I was thinking. I would be ok to also just call out the 2-D distance correct?

[craiger_ny]

Not if you want bonus you'll need to do TP. Unless of course you code your bonus.

Craig

[JamesMannes]

Thank you craiger. The fog is lifting from my melon.