I have a part that will change length. I need to locate a form tool feature (punched feature) a fixed distance from one end, and then patterned 1" apart, only as they will fit fully as the part length grows. I cannot have half a punched feature hanging off the part end, so if I start 2" from the beginning, as the part adds length, I can add a feature to my pattern for each inch the part grows, but if it only grows a half an inch, I cannot yet add another punch.

I hope this is clear enough and that someone can help me. I'm pretty sure this will get into equations. Seeking help with how to set them up.

Thanks in advance!